MAX3224E/MAX3225E/ MAX3226E/MAX3227E/MAX3244E/MAX3245E

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1 MAXE/MAX7E/ MAX44E/ ±5k ESD-Protected, µa, Mbps,. to 5.5, AAILABLE General Description The MAX4E/MAX5E/MAXE/MAX7E/ MAX44E/ are -powered EIA/TIA- and.8/.4 communications interfaces with automatic shutdown/wakeup features, high data-rate capabilities, and enhanced electrostatic discharge (ESD) protection. All transmitter outputs and receiver inputs are protected to ±5k using IEC -4- Air-Gap Discharge, ±8k using IEC -4- Contact Discharge, and ±5k using the Human Body Model. All devices achieve a µa supply current using Maxim s revolutionary AutoShutdown Plus feature. These devices automatically enter a low-power shutdown mode when the RS- cable is disconnected or the transmitters of the connected peripherals are inactive, and the UART driving the transmitter inputs is inactive for more than seconds. They turn on again when they sense a valid transition at any transmitter or receiver input. AutoShutdown Plus saves power without changes to the existing BIOS or operating system. The MAX5E/MAX7E/ also feature MegaBaud operation, guaranteeing Mbps for highspeed applications such as communicating with ISDN modems. The MAX4E/MAXE/MAX44E guarantee 5kbps operation. The transceivers have a proprietary low-dropout transmitter output stage enabling true RS- performance from a +. to +5.5 supply with a dual charge pump. The charge pump requires only four small.µf capacitors for operation from a. supply. The MAX4E MAX7E feature a logiclevel output (READY) that asserts when the charge pump is regulating and the device is ready to begin transmitting. All devices are available in a space-saving TQFN, SSOP, and TSSOP (MAX4E/MAX5E/MAX44E/ ) packages. Applications Notebook, Subnotebook, and Palmtop Computers Cellular Phones Battery-Powered Equipment Hand-Held Equipment Peripherals Printers Next Generation Device Features For Space-Constrained Applications: MAX8E/MAX9E: ±5k ESD-Protected, +.5 to +5.5, RS- Transceivers in UCSP MAXE/MAXE/MAX4E/MAX4E: ±5k ESD-Protected, Down to na, +. to +5.5, Up to Mbps, True RS- Transceivers (MAX4E Available in UCSP) For Low-oltage or Data Cable Applications: MAX8E/MAX8E: +.5 to +5.5, µa, Tx/Rx RS- Transceivers with ±5k ESD-Protected I/O and Logic Pins PART NO. OF DRIERS/ RECEIERS GUARANTEED DATA RATE (bps) READY OUTPUT MAX4E MAX5E MAXE / / / 5k M 5k MAX7E / M MAX44E /5 /5 Ordering Information PART TEMP RANGE PIN-PACKAGE MAX4ECTP+ C to +7 C TQFN-EP* MAX4ECUP+ C to +7 C TSSOP MAX4ECAP+ C to +7 C SSOP MAX4ECPP+ C to +7 C Plastic DIP MAX4EETP+ -4 C to +85 C TQFN-EP* MAX4EEUP+ -4 C to +85 C TSSOP MAX4EEAP+ -4 C to +85 C SSOP MAX4EEPP+ -4 C to +85 C Plastic DIP MAX4EAAP+ -4 C to +5 C SSOP +Denotes a lead(pb)-free/rohs-compliant package. *EP = Exposed pad. Ordering Information continued at end of data sheet. Selector Guide 5k M Auto- Shutdown Plus AutoShutdown Plus, MegaBaud, and UCSP are trademarks of Maxim Integrated Products, Inc. For pricing, delivery, and ordering information, please contact Maxim Direct at , or visit Maxim s website at 9-9; Rev ; /

2 ±5k ESD-Protected, µa, Mbps,. to 5.5, ABSOLUTE MAXIMUM RATINGS to...-. to + + to (Note )...-. to +7 - to (Note )...+. to (Note )...+ Input oltages T_IN,, to to + R_IN to...±5 Output oltages T_OUT to...±. R_OUT, INALID, READY to...-. to ( +.) Short-Circuit Duration T_OUT to...continuous Continuous Power Dissipation (T A = +7 C) -Pin SSOP (derate 7.4mW/ C above +7 C)...57mW -Pin TSSOP (derate 9.4mW/ C above +7 C) mW -Pin TQFN (derate.8mw/ C above +7 C)...7mW Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS -Pin TQFN (derate.mw/ C above +7 C)...7.mW -Pin Plastic DIP (derate.mw/ C above +7 C)...889mW -Pin SSOP (derate 8.mW/ C above +7 C)...4mW -Pin TSSOP (derate.9mw/ C above +7 C)...879mW 8-Pin Wide SO (derate.5mw/ C above +7 C)...W 8-Pin SSOP (derate 9.5mW/ C above +7 C)...7mW 8-Pin TSSOP (derate.8mw/ C above +7 C)...mW -Pin TQFN (derate.mw/ C above +7 C)...5mW Operating Temperature Ranges MAX EC... C to +7 C MAX EE...-4 C to +85 C MAX EAA_...-4 C to +5 C Storage Temperature Range...-5 C to + C Lead Temperature (soldering, s)...+ C Soldering Temperature (reflow)...+ C Note : + and - can have maximum magnitudes of 7, but their absolute difference cannot exceed. ( = + to +5.5, C C4 =.µf, tested at. ±%; C =.47µF, C C4 =.µf, tested at 5. ±%; T A = T MIN to T MAX, unless otherwise noted. Typical values are at T A = +5 C.) PARAMETER SYMBOL CONDITIONS DC CHARACTERISTICS ( =. or 5., T A = +5 C) Supply Current, AutoShutdown Plus =, =, all R_IN idle, all T_IN idle Supply Current, Shutdown = Supply Current, AutoShutdown Plus Disabled = =, no load LOGIC INPUTS AND RECEIER OUTPUTS Input Logic Threshold Low T_IN,, Input Logic Threshold High T_IN,, =. = 5. Transmitter Input Hysteresis Input Leakage Current T_IN,, Output Leakage Current R_OUT (MAX44E/), receivers disabled Output oltage Low I OUT =.ma Output oltage High I OUT = -.ma RECEIER INPUTS Input oltage Range Input Threshold Low T A = +5 C =. = 5. Input Threshold High T A = +5 C =. = 5. Input Hysteresis Input Resistance T A = +5 C MIN TYP MAX.4..5 ±. ± ±.5 ± UNITS µa µa ma µa µa kω Maxim Integrated

3 ±5k ESD-Protected, µa, Mbps,. to 5.5, ELECTRICAL CHARACTERISTICS (continued) ( = + to +5.5, C C4 =.µf, tested at. ±%; C =.47µF, C C4 =.µf, tested at 5. ±%; T A = T MIN to T MAX, unless otherwise noted. Typical values are at T A = +5 C.) PARAMETER TRANSMITTER OUTPUTS Output oltage Swing Output Resistance Output Short-Circuit Current SYMBOL CONDITIONS All transmitter outputs loaded with kω to ground = + = - =, transmitter outputs = ± Output Leakage Current CC = or to 5.5, OUT = ±, Transmitters disabled MOUSE DRIEABILITY (MAX44E/) MAX4E/MAX5E/ MIN TYP MAX ±5 ±5.4 M UNITS Ω ± ma ±5 µa = TIN =, TIN =, TOUT loaded with kω to, Transmitter Output oltage TOUT and TOUT loaded with.5ma each ESD PROTECTION IEC -4- Air Discharge R_IN, T_OUT IEC -4- Contact Discharge Human Body Model AutoShutdown Plus ( =, = ) Receiver Input Threshold to Positive threshold Figure 4a INALID Output High Negative threshold Receiver Input Threshold to Figure 4a INALID Output Low ±5 ±5 ±8 ± k INALID, READY Output oltage Low (MAX4E MAX7E) I OUT = -.ma.4 INALID, READY Output oltage High (MAX4E MAX7E) I OUT = -.ma -. Receiver Positive or Negative Threshold to INALID High t INH = 5, Figure 4b µs Receiver Positive or Negative Threshold to INALID Low t INL = 5, Figure 4b µs Receiver or Transmitter Edge to Transmitters Enabled t WU = 5, Figure 5b (Note ) µs Receiver or Transmitter Edge to Transmitters Shutdown t AUTOSHDN = 5, Figure 5b (Note ) 5 s Maxim Integrated

4 ±5k ESD-Protected, µa, Mbps,. to 5.5, TIMING CHARACTERISTICS MAX4E/MAXE/MAX44E ( = + to +5.5, C C4 =.µf, tested at. ±%; C =.47µF, C C4 =.µf, tested at 5. ±%; T A = T MIN to T MAX, unless otherwise noted. Typical values are at T A = +5 C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Maximum Data Rate Receiver Propagation Delay Receiver Output Enable Time Receiver Output Disable Time Transmitter Skew Receiver Skew Transition-Region Slew Rate R L = kω, C L = pf, one transmitter switching kbps t PHL.5 R_IN to R_OUT, C L = 5pF t PLH.5 µs Normal operation (MAX44E only) ns Normal operation (MAX44E only) ns t PHL - t PLH (Note ) ns t PHL - t PLH 5 ns =., T A = +5 C, R L = kω to 7kΩ, C L = 5pF measured from + to - to pf or - to +, one transmitter /µs switching 5 TIMING CHARACTERISTICS MAX5E/MAX7E/ ( = + to +5.5, C C4 =.µf, tested at. ±%; C =.47µF, C C4 =.µf, tested at 5. ±%; T A = T MIN to T MAX, unless otherwise noted. Typical values are at T A = +5 C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS R L = kω, C L = pf, one transmitter switching 5 Maximum Data Rate Receiver Propagation Delay Receiver Output Enable Time Receiver Output Disable Time Transmitter Skew Receiver Skew Transition-Region Slew Rate t PHL t PLH t PHL - t PLH t PHL - t PLH =. to 4.5, R L = kω, C L = 5pF, one transmitter switching = 4.5 to 5.5, R L = kω, C L = pf, one transmitter switching R_IN to R_OUT, C L = 5pF Normal operation ( only) Normal operation ( only) (Note ) =., T A = +5 C, R L = kω to 7kΩ, C L = 5pF to pf, measured from + to - or - to +, one transmitter switching kbps Note : A transmitter/receiver edge is defined as a transition through the transmitter/receiver input logic thresholds. Note : Transmitter skew is measured at the transmitter zero cross points µs ns ns ns ns /µs 4 Maxim Integrated

5 ±5k ESD-Protected, µa, Mbps,. to 5.5, Typical Operating Characteristics ( = +., 5kbps data rate,.µf capacitors, all transmitters loaded with kω and C L, T A = +5 C, unless otherwise noted.) TRANSMITTER SKEW (ns) TRANSMITTER OUTPUT OLTAGE () TRANSMITTER OUTPUT OLTAGE () MAX4E/MAXE TRANSMITTER OUTPUT OLTAGE vs. LOAD CAPACITANCE T TRANSMITTING AT 5kbps T (MAX4E) TRANSMITTING AT 5.kbps 4 5 OUT+ OUT- MAX5E/MAX7E TRANSMITTER OUTPUT OLTAGE vs. LOAD CAPACITANCE Mbps.5Mbps TRANSMITTER AT FULL DATA RATE TRANSMITTER AT / DATA RATE (MAX5E) LOAD = kω + C L.5Mbps Mbps MAX5E/MAX7E TRANSMITTER SKEW vs. LOAD CAPACITANCE TRANSMITTER AT 5kbps TRANSMITTER AT kbps (MAX5E) LOAD = kω + C L AERAGE: PARTS Mbps Mbps MAX4-7/44/45E- MAX4-7/44/45E-4 MAX4-7/44/45E-7 SLEW RATE (/μs) SLEW RATE (/μs) READY TURN-ON TIME (μs) MAX4E/MAXE SLEW RATE vs. LOAD CAPACITANCE +SLEW FOR DATA RATES UP TO 5kbps 4 5 -SLEW MAX5E/MAX7E SLEW RATE vs. LOAD CAPACITANCE +SLEW -SLEW TRANSMITTER AT Mbps TRANSMITTER AT.5kbps (MAX5E) MAX4E MAX7E READY TURN-ON TIME vs. TEMPERATURE TEMPERATURE ( C) MAX4-7/44/45E- MAX4-7/44/45E-5 MAX4-7/44/45E-8 SUPPLY CURRENT (ma) SUPPLY CURRENT (ma) READY TURN-OFF TIME (ns) MAX4E/MAXE OPERATING SUPPLY CURRENT vs. LOAD CAPACITANCE 5kbps 4 5 kbps kbps T TRANSMITTING AT 5kbps T (MAX4E) TRANSMITTING AT 5.kbps MAX5E/MAX7E OPERATING SUPPLY CURRENT vs. LOAD CAPACITANCE TRANSMITTER AT FULL DATA RATE 9 TRANSMITTER AT / DATA RATE 8 (MAX5E) LOAD = kω + C 7 L Mbps 5.5Mbps 4 Mbps MAX4E MAX7E READY TURN-OFF TIME vs. TEMPERATURE TEMPERATURE ( C) MAX4-7/44/45E- MAX4-7/44/45E- MAX4-7/44/45E-9 Maxim Integrated 5

6 ±5k ESD-Protected, µa, Mbps,. to 5.5, Typical Operating Characteristics (continued) ( = +., 5kbps data rate,.µf capacitors, all transmitters loaded with kω and C L, T A = +5 C, unless otherwise noted.) TRANSMITTER OUTPUT OLTAGE () MAX44E TRANSMITTER OUTPUT OLTAGE vs. LOAD CAPACITANCE TRANSMITTER AT 5kbps TRANSMITTERS AT 5.kbps OUT+ OUT- MAX4-7/44/45E- SLEW RATE (/μs) MAX44E SLEW RATE vs. LOAD CAPACITANCE MAX4-7/44/45E- SUPPLY CURRENT (ma) 5 4 MAX44E OPERATING SUPPLY CURRENT vs. LOAD CAPACITANCE TRANSMITTER AT 5kbps TRANSMITTERS AT 5.kbps 5kbps kbps kbps MAX4-7/44/45E TRANSMITTER OUTPUT OLTAGE () TRANSMITTER OUTPUT OLTAGE vs. LOAD CAPACITANCE Mbps Mbps.5Mbps TRANSMITTER AT FULL DATA RATE TRANSMITTERS AT / DATA RATE.5Mbps 4 8 Mbps Mbps MAX4-7/44/45E- SLEW RATE (/μs) SLEW RATE vs. LOAD CAPACITANCE TRANSMITTER AT Mbps TRANSMITTERS AT.5kbps 4 8 MAX4-7/44/45E-4 SUPPLY CURRENT (ma) OPERATING SUPPLY CURRENT vs. LOAD CAPACITANCE Mbps Mbps.5Mbps MAX4-7/44/45E-5 TRANSMITTER SKEW (ns) TRANSMITTER SKEW vs. LOAD CAPACITANCE MAX4-7/44/45E- TRANSMITTER AT FULL DATA RATE TRANSMITTERS AT / DATA RATE Maxim Integrated

7 ±5k ESD-Protected, µa, Mbps,. to 5.5, Pin Description MAX4E MAX5E DIP/ TQFN SSOP/ TSSOP PIN MAXE MAX7E TQFN SSOP/ TSSOP MAX44E SO/ SSOP/ TSSOP TQFN NAME FUNCTION 9 4 READY Ready to Transmit Output, active-high. READY is enabled high when - goes below -4 and the device is ready to transmit. 8 C+ Positive Terminal of oltage- Doubler Charge-Pump Capacitor generated by the charge pump C- Negative Terminal of oltage- Doubler Charge-Pump Capacitor 5 5 C+ Positive Terminal of Inverting Charge-Pump Capacitor 4 4 C- Negative Terminal of Inverting Charge-Pump Capacitor Generated by the Charge Pump, 5 8, 7 9,, 7, 8, 9 T_OUT RS- Transmitter Outputs 7, 4 9, R_IN RS- Receiver Inputs 8,, ,, 7, 9, R_OUT TTL/CMOS Receiver Outputs 9 7 INALID alid Signal Detector Output, active low. A logic high indicates that a valid RS- level is present on a receiver input.,, 8-4,, T_IN TTL/CMOS Transmitter Inputs Maxim Integrated 7

8 ±5k ESD-Protected, µa, Mbps. to 5.5, Pin Description (continued) MAX4E MAX5E DIP/ TQFN SSOP/ TSSOP PIN MAXE MAX7E TQFN SSOP/ TSSOP MAX44E SO/ SSOP/ TSSOP TQFN NAME FUNCTION Force-On Input, Active High. Drive high to override AutoShutdown Plus, keeping transmitters and receivers on ( must be high) (Table ) Ground CC +. to +5.5 Single Supply oltage 8 4 Force-Off Input, Active Low. Drive low to shut down transmitters, receivers (except ROUTB), and charge pump. This overrides AutoShutdown Plus and (Table ). ROUTB TTL/CMOS Noninverting Complementary Receiver Outputs. Always active.,, 4, 8,, 8,, EP N.C. No Connection. Not internally connected. Exposed Pad. Solder the exposed pad to the ground plane or leave unconnected. Detailed Description Dual Charge-Pump oltage Converter The MAX4E MAX7E/MAX44E/ s internal power supply consists of a regulated dual charge pump that provides output voltages of +5.5 (doubling charge pump) and -5.5 (inverting charge pump), over the +. to +5.5 range. The charge pump operates in discontinuous mode: if the output voltages are less than 5.5, the charge pump is enabled; if the output voltages exceed 5.5, the charge-pump is disabled. Each charge pump requires a flying capacitor (C, C) and a reservoir capacitor (C, C4) to generate the + and - supplies. The READY output (MAX4E MAX7E) is low when the charge pumps are disabled in shutdown mode. The READY signal asserts high when - goes below Maxim Integrated

9 ±5k ESD-Protected, µa, Mbps. to 5.5, POWER- MANAGEMENT UNIT OR KEYBOARD CONTROLLER INALID MAX44E PROTECTION DIODE Rx I PREIOUS RS- UART Tx CPU I/O CHIP WITH UART RS- SHDN = a) OLDER RS-: POWERED-DOWN UART DRAWS CURRENT FROM ACTIE RECEIER OUTPUT IN SHUTDOWN. TO μp LOGIC TRANSITION DETECTOR Figure. Interface Under Control of PMU RS- Transmitters The transmitters are inverting level translators that convert CMOS-logic levels to 5. EIA/TIA- levels. The MAX4E/MAXE/MAX44E guarantee a 5kbps data rate (Mbps, for the MAX5E/MAX7E/ ) with worst-case loads of kω in parallel with pf, providing compatibility with PC-to-PC communication software (such as LapLink ). Transmitters can be paralleled to drive multiple receivers. Figure shows a complete system connection. When is driven to ground or when the Auto- Shutdown Plus circuitry senses that all receiver and transmitter inputs are inactive for more than s, the transmitters are disabled and the outputs go into a highimpedance state. When powered off or shut down, the outputs can be driven to ±. The transmitter inputs do not have pullup resistors. Connect unused inputs to or. LapLink is a registered trademark of Laplink Software, Inc. UART PROTECTION DIODE Rx Tx ROUTB ROUT THREE-STATED = I MAX44E b) NEW MAX44E/: IN SHUTDOWN, ROUTB IS USED TO MONITOR EXTERNAL DEICES AND ROUT IS THREE STATED, ELIMINATING A CURRENT PATH THROUGH THE UART'S PROTECTION DIODE. Figure. The MAX44E/ detect RS- activity when the UART and interface are shut down. RIN TOUT Maxim Integrated 9

10 ±5k ESD-Protected, µa, Mbps. to 5.5, Table. Output Control Truth Table OPERATION STATUS Shutdown (Forced Off) Normal Operation (Forced On) Normal Operation (AutoShutdown Plus) Shutdown (Auto- Shutdown Plus) Normal Operation Normal Operation ALID RECEIER LEEL RECEIER OR TRANSMITTER EDGE WITHIN s T_OUT R_OUT (MAX4E/ MAX5E/ MAXE/ MAX7E) R_OUT (MAX44E/ ) ROUTB (MAX44E/ ) X X X High-Z Active High-Z Active X X Active Active Active Active X Yes Active Active Active Active X No High-Z Active Active Active INALID* Yes X Active Active Active Active INALID* X Yes Active Active Active Active Shutdown INALID* No No High-Z Active Active Active Normal Operation (AutoShutdown) Shutdown (AutoShutdown) INALID* INALID** Yes X Active Active Active Active INALID* INALID** No X High-Z Active High-Z Active X = Don t care * INALID connected to ** INALID connected to and RS- Receivers The receivers convert RS- signals to CMOS-logic output levels. The MAX4E MAX7E feature inverting outputs that always remain active (Table ). The MAX44E/ have inverting three-state outputs that are high impedance when shut down ( = ) (Table ). The MAX44E/ feature an extra, always active, noninverting output, ROUTB. ROUTB output monitors receiver activity while the other receivers are high impedance, allowing ring indicator applications to be monitored without forward biasing other devices connected to the receiver outputs. This is ideal for systems where is set to ground in shutdown to accommodate peripherals such as UARTs (Figure ). The MAX4E MAX7E/MAX44E/ feature an INALID output that is enabled low when no valid RS- voltage levels have been detected on all receiver inputs. Because INALID indicates the receiver input s condition, it is independent of and states (Figures and 4). AutoShutdown Plus Mode The MAX4E MAX7E/MAX44E/ achieve a µa supply current with Maxim s AutoShutdown Plus feature, which operates when is high and a is low. When these devices do not sense a valid signal transition on any receiver and transmitter input for s, the on-board charge pumps are shut down, reducing supply current to µa. This occurs if the RS- cable is disconnected or if the connected Maxim Integrated

11 ±5k ESD-Protected, µa, Mbps. to 5.5, +. T_IN EDGE DETECT R_IN -. μs TIMER R INALID R_IN EDGE DETECT S s TIMER R AUTOSHDN INALID ASSERTED IF ALL RECEIER INPUTS ARE BETWEEN +. AND -. FOR AT LEAST μs. Figure a. INALID Functional Diagram, INALID Low Figure c. AutoShutdown Plus Logic +.7 POWERDOWN* R_IN -.7 μs TIMER R INALID INALID DEASSERTED IF ANY RECEIER INPUT HAS BEEN BETWEEN +.7 AND -.7 FOR LESS THAN μs. Figure b. INALID Functional Diagram, INALID High AUTOSHDN * POWERDOWN IS ONLY AN INTERNAL SIGNAL. IT CONTROLS THE OPERATIONAL STATUS OF THE TRANSMITTERS AND THE POWER SUPPLIES. Figure d. Power-Down Logic Table. INALID Truth Table RS- SIGNAL PRESENT AT ANY RECEIER INPUT Yes No INALID OUTPUT High Low peripheral transmitters are turned off, and the UART driving the transmitter inputs is inactive. The system turns on again when a valid transition is applied to any RS- receiver or transmitter input. As a result, the system saves power without changes to the existing BIOS or operating system. Figures a and b depict valid and invalid RS- receiver voltage levels. INALID indicates the receiver input s condition, and is independent of and states. Figure and Tables and summarize the operating modes of the MAX4E MAX7E/MAX44E/. and override AutoShutdown Plus circuitry. When neither control is asserted, the IC selects between these states automatically based on the last receiver or transmitter input edge received. When shut down, the device s charge pumps turn off, + is pulled to, - is pulled to ground, the transmitter outputs are high impedance, and READY (MAX4E MAX7E) is driven low. The time required to exit shutdown is typically µs (Figure 8). By connecting to INALID, the MAX4E MAX7E/MAX44E/ shut down when no valid receiver level and no receiver or transmitter edge is detected for s, and wake up when a valid receiver level or receiver or transmitter edge is detected. RECEIER INPUT LEELS INALID HIGH INDETERMINATE INALID LOW INDETERMINATE INALID HIGH Figure 4a. Receiver Positive/Negative Thresholds for INALID Maxim Integrated

12 ±5k ESD-Protected, µa, Mbps. to 5.5, RECEIER INPUTS } INALID REGION TRANSMITTER INPUTS TRANSMITTER OUTPUTS INALID OUTPUT t INL t INH t AUTOSHDN t AUTOSHDN t WU t WU READY * + - *MAX4E MAX7E Figure 4b. AutoShutdown Plus, INALID, and READY Timing Diagram By connecting and to INALID, the MAX4E MAX7E/MAX44E/ shut down when no valid receiver level is detected and wake up when a valid receiver level is detected (same functionality as AutoShutdown feature on MAXE/ MAXE/MAX4E). A mouse or other system with AutoShutdown Plus may need time to wake up. Figure 5 shows a circuit that forces the transmitters on for ms, allowing enough time for the other system to realize that the MAX44E/ is awake. If the other system outputs valid RS- signal transitions within that time, the RS- ports on both systems remain enabled. Software-Controlled Shutdown If direct software control is desired, use INALID to indicate DTR or ring indicator signal. Tie and together to bypass the AutoShutdown Plus so the line acts like a SHDN input. ±5k ESD Protection As with all Maxim devices, ESD-protection structures are incorporated on all pins to protect against electrostatic discharges encountered during handling and assembly. The driver outputs and receiver inputs of the MAX4E MAX7E/MAX44E/ have extra protection against static electricity. Maxim s engineers have developed state-of-the-art structures to protect POWER- MANAGEMENT UNIT MASTER SHDN LINE.μF MAX4E MAX5E MAXE MAX7E MAX44E MΩ Figure 5. AutoShutdown Plus Initial Turn-On to Wake Up a Mouse or Another System Maxim Integrated

13 ±5k ESD-Protected, µa, Mbps. to 5.5, R C MΩ R D 5Ω R C 5MΩ to MΩ R D Ω CHARGE-CURRENT LIMIT RESISTOR DISCHARGE RESISTANCE CHARGE CURRENT LIMIT RESISTOR DISCHARGE RESISTANCE HIGH- OLTAGE DC SOURCE Cs pf STORAGE CAPACITOR DEICE UNDER TEST HIGH- OLTAGE DC SOURCE Cs 5pF STORAGE CAPACITOR DEICE UNDER TEST Figure a. Human Body ESD Test Model Figure 7a. IEC -4- ESD Test Model I I P % 9% Ir PEAK-TO-PEAK RINGING (NOT DRAWN TO SCALE) % 9% AMPERES.8% % t RL TIME t DL CURRENT WAEFORM IPEAK % Figure b. Human Body Current Waveform tr =.7ns to ns ns t these pins against ESD of ±5k without damage. The ESD structures withstand high ESD in all states: normal operation, shutdown, and powered down. After an ESD event, Maxim s E versions keep working without latchup, whereas competing RS- products can latch and must be powered down to remove latchup. ESD protection can be tested in various ways; the transmitter outputs and receiver inputs of this product family are characterized for protection to the following limits: ) ±5k using the Human Body Model ) ±8k using the Contact-Discharge Method specified in IEC -4- ) ±5k using IEC -4- s Air-Gap Method. ns Figure 7b. IEC -4- ESD Generator Current Waveform ESD Test Conditions ESD performance depends on a variety of conditions. Contact Maxim for a reliability report that documents test setup, test methodology, and test results. Human Body Model Figure a shows the Human Body Model and Figure b shows the current waveform it generates when discharged into a low impedance. This model consists of a pf capacitor charged to the ESD voltage of interest, which is then discharged into the test device through a. resistor. Maxim Integrated

14 ±5k ESD-Protected, µa, Mbps. to 5.5, IEC -4- The IEC -4- standard covers ESD testing and performance of finished equipment; it does not specifically refer to integrated circuits. The MAX4E MAX7E, MAX44E/ help you design equipment that meets Level 4 (the highest level) of IEC -4-, without the need for additional ESD-protection components. The major difference between tests done using the Human Body Model and IEC -4- is higher peak current in IEC -4-, because series resistance is lower in the IEC -4- model. Hence, the ESD withstand voltage measured to IEC -4- is generally lower than that measured using the Human Body Model. Figure 7a shows the IEC -4- model and Figure 7b shows the current waveform for the 8k, IEC -4-, Level 4, ESD Contact-Discharge Method. The Air-Gap Method involves approaching the device with a charged probe. The Contact-Discharge Method connects the probe to the device before the probe is energized. Machine Model The Machine Model for ESD tests all pins using a pf storage capacitor and zero discharge resistance. Its objective is to emulate the stress caused by contact that occurs with handling and assembly during manufacturing. Of course, all pins require this protection during manufacturing, not just RS- inputs and outputs. Therefore, after PC board assembly, the Machine Model is less relevant to I/O ports. Applications Information Capacitor Selection The capacitor type used for C C4 is not critical for proper operation; polarized or nonpolarized capacitors Table. Required Minimum Capacitance alues () C, C BYPASS (µf) C, C, C4 (µf). to....5 to to to /div /div 5/div =. C C4 =.μf 5μs/div = TOUT TOUT READY Figure 8. Transmitter Outputs when Exiting Shutdown or Powering Up can be used. The charge pump requires.µf capacitors for. operation. For other supply voltages, see Table for required capacitor values. Do not use values smaller than those listed in Table. Increasing the capacitor values (e.g., by a factor of ) reduces ripple on the transmitter outputs and slightly reduces power consumption. C, C, and C4 can be increased without changing C s value. However, do not increase C without also increasing the values of C, C, C4, and C BYPASS, to maintain the proper ratios (C to the other capacitors). When using the minimum required capacitor values, make sure the capacitor value does not degrade excessively with temperature. If in doubt, use capacitors with a larger nominal value. The capacitor s equivalent series resistance (ESR), which usually rises at low temperatures, influences the amount of ripple on + and -. Power-Supply Decoupling In most circumstances, a.µf bypass capacitor is adequate. In applications that are sensitive to powersupply noise, use a capacitor of the same value as charge-pump capacitor C. Connect bypass capacitors as close to the IC as possible. Transmitter Outputs when Exiting Shutdown Figure 8 shows two transmitter outputs when exiting shutdown mode. As they become active, the two transmitter outputs are shown going to opposite RS- levels (one transmitter input is high, the other is low). Each 4 Maxim Integrated

15 ±5k ESD-Protected, µa, Mbps. to 5.5, transmitter is loaded with kω in parallel with pf. The transmitter outputs display no ringing or undesirable transients as they come out of shutdown. Note that the transmitters are enabled only when the magnitude of - exceeds approximately -. 5/div High Data Rates The MAX4E/MAXE/MAX44E maintain the RS- ±5. minimum transmitter output voltage even at high data rates. Figure 9 shows a transmitter loopback test circuit. Figure shows a loopback test result at kbps, and Figure shows the same test at 5kbps. For Figure, all transmitters were driven simultaneously at kbps into RS- loads in parallel with pf. For Figure, a single transmitter was driven at 5kbps, and all transmitters were loaded with an RS- receiver in parallel with 5pF. The MAX5E/MAX7E/ maintain the RS- ±5. minimum transmitter output voltage at data rates up to Mbps (MegaBaud). Figure shows a loopback test result with a single transmitter driven at Mbps and all transmitters loaded with an RS- receiver in parallel with 5pF. TOUT ROUT Figure. MAX4E/MAXE/MAX44E Loopback Test Result at kbps =. μs/div 5/div 5/div 5/div TOUT 5/div C BYPASS ROUT =. 5/div C C C+ C- C+ C- T_ IN MAX4E MAX5E MAXE MAX7E MAX44E + - T_ OUT C* C4 Figure. MAX4E/MAXE/MAX44E Loopback Test Result at 5kbps μs/div 5/div R_ OUT R_ IN TOUT 5/div pf ROUT =. 5/div *C CAN BE RETURNED TO OR. Figure 9. Loopback Test Circuit ns/div Figure. MAX5E/MAX7E/ Loopback Test Result at Mbps Maxim Integrated 5

16 ±5k ESD-Protected, µa, Mbps. to 5.5, +..μf C.μF 8 4 C+ C- + 7 C.μF COMPUTER SERIAL PORT C.μF C+ C- MAX44E - C4.μF 4 TOUT 9 + LOGIC INPUTS TIN TOUT + TIN TOUT - ROUTB 9 ROUT RIN 4 Tx 8 ROUT RIN 5 LOGIC OUTPUTS 7 ROUT RIN RS- INPUTS R4OUT R4IN 7 5 R5OUT R5IN 8 SERIAL MOUSE TO POWER- MANAGEMENT UNIT INALID 5 Figure a. Mouse Driver Test Circuit Maxim Integrated

17 ±5k ESD-Protected, µa, Mbps. to 5.5, TRANSMITTER OUTPUT OLTAGE () =. OUT+ OUT- OUT+ OUT LOAD CURRENT PER TRANSMITTER (ma) Figure b. MAX4_E Transmitter Output oltage vs. Load Current per Transmitter MAX4E-FIG5 Mouse Driveability The MAX44E/ are specifically designed to power serial mice while operating from low-voltage power supplies. They have been tested with leading mouse brands from manufacturers such as Microsoft and Logitech. The MAX44E/ successfully drove all serial mice tested and met their respective current and voltage requirements. The MAX44E/ dual charge pump ensures the transmitters supply at least ±5 during worst-case conditions. Figure b shows the transmitter output voltages under increasing load current. Figure a shows a typical mouse connection. Interconnection with and 5 Logic The MAX4E MAX7E/MAX44E/ can directly interface with various 5 logic families, including ACT and HCT CMOS. See Table 4 for more information on possible combinations of interconnections. Table 5 lists other Maxim ESD-powered transceivers. Table 4. Logic Family Compatibility with arious Supply oltages SYSTEM POWER-SUPPLY OLTAGE () SUPPLY OLTAGE () COMPATIBILITY.. Compatible with all CMOS families 5 5 Compatible with all TTL and CMOS families 5. Compatible with ACT and HCT CMOS, and with AC, HC, or CD4 CMOS Table 5. ±5k ESD-Protected,. to 5.5 Powered RS- Transceivers from Maxim PART SUPPLY OLTAGE RANGE () NO. OF Tx/Rx SUPPLY CURRENT (µa) Auto- Shutdown Plus Auto- Shutdown Human Body Model (k) IEC -4- Contact Discharge (k) IEC -4- Air-Gap Discharge (k) GUARANTEED DATA RATE (kbps) MAX4E +. to +5.5 /5 ±5 ±8 ±5 5 MAX4E +. to +5.5 /5 Yes ±5 ±8 ±5 5 MAX44E +. to +5.5 /5 Yes ±5 ±8 ± to +5.5 /5 Yes ±5 ±8 ±5 Mbps MAXE +. to +5.5 / ±5 ±8 ±5 5 MAXE +. to +5.5 / ±5 ±8 ±5 5 MAXE +. to +5.5 / Yes ±5 ±8 ±5 5 MAX4E +. to +5.5 / Yes ±5 ±8 ±5 5 MAX5E +. to +5.5 / Yes ±5 ±8 ±5 Mbps MAXE +. to +5.5 / Yes ±5 ±8 ±5 5 MAXE +. to +5.5 / Yes ±5 ±8 ±5 5 MAX7E +. to +5.5 / Yes ±5 ±8 ±5 Mbps Maxim Integrated 7

18 ±5k ESD-Protected, µa, Mbps. to 5.5, Typical Operating Circuits C BYPASS C.μF C.μF +..μf 4 5 C+ C- C+ C- C+ C- C+ C- 5 MAXE* MAX7E C.μF C4.μF C BYPASS.μF C.μF C.μF MAX44E*** C.μF C4.μF TOUT 4 TOUT 9 9 ROUT RIN 8 TIN TOUT TIN TOUT READY AutoShutdown Plus INALID TO POWER- MANAGEMENT UNIT AutoShutdown Plus INALID ROUTB C BYPASS C.μF C.μF +..μf 4 5 C+ C- C+ C- 4 9 MAX4E** MAX5E TOUT 7 C.μF C4.μF ROUT ROUT ROUT R4OUT RIN 4 RIN 5 RIN R4IN 7 TTL/CMOS INPUTS TIN TOUT 8 RS- OUTPUTS 5 R5OUT R5IN 8 TTL/CMOS OUTPUTS 5 ROUT ROUT RIN RIN 9 RS- INPUTS 5 4 READY AutoShutdown Plus INALID TO POWER- MANAGEMENT UNIT *MAXE/MAX7E PIN OUT REFERS TO SSOP/TSSOP PACKAGES. **MAX4E/MAX5E PIN OUT REFERS TO DIP/ SSOP/TSSOP PACKAGES. ***MAX44E/ PIN OUT REFERS TO SO/SSOP/TSSOP PACKAGES. 8 8 Maxim Integrated

19 ±5k ESD-Protected, µa, Mbps. to 5.5, Pin Configurations TOP IEW READY + READY + C TOUT C+ CC RIN MAX4E MAX5E C+ C+ ROUT C- TOUT 9 MAXE MAX7E - C- C- C- C- TQFN TIN + + *EP 4 5 *EP INALID ROUT RIN TOUT INALID ROUT RIN TOP IEW N.C. MAX44E SO/SSOP/TSSOP C+ N.C. C N.C. TIN TIN N.C. R5OUT R4OUT TQFN CC N.C RIN RIN RIN R4IN 4 R5IN 5 N.C. TOUT TOUT TOUT *EP ROUT N.C C+ + C- INALID ROUTB ROUT ROUT ROUT R4OUT R5OUT READY C READY C C+ C- - C- 4 MAXE TOUT C- 4 7 TOUT RIN 4 MAX7E C+ 5 C+ 5 MAX4E RIN RIN 5 MAX5E C- - RIN INALID ROUT C- - TOUT ROUT RIN R4IN R5IN 7 8 SSOP/TSSOP RIN 9 TIN TOUT 9 ROUT INALID TOUT TOUT TOP IEW DIP/SSOP/TSSOP TIN TIN C- INALID N.C. ROUTB ROUT ROUT TQFN *CONNECT EP TO. Maxim Integrated 9

20 ±5k ESD-Protected, µa, Mbps. to 5.5, Ordering Information (continued) PART TEMP RANGE PIN-PACKAGE MAX5ECUP+ C to +7 C TSSOP MAX5ECTP+ C to +7 C TQFN-EP* MAX5ECAP+ C to +7 C SSOP MAX5ECPP+ C to +7 C Plastic DIP MAX5EETP+ -4 C to +85 C TQFN -EP* MAX5EEUP+ -4 C to +85 C TSSOP MAX5EEAP+ -4 C to +85 C SSOP MAX5EEPP+ -4 C to +85 C Plastic DIP MAX5EAAP+ -4 C to +5 C SSOP MAXECTE+ C to +7 C TQFN-EP* MAXECUE+ C to +7 C TSSOP MAXECAE+ C to +7 C SSOP MAXEEAE+ -4 C to +85 C SSOP MAXEETE+ -4 C to +85 C TQFN-EP* MAXEEUE+ -4 C to +85 C TSSOP MAXEAAE+ -4 C to +5 C SSOP MAX7ECAE+ C to +7 C SSOP MAX7ECTE+ C to +7 C TQFN-EP* MAX7ECUE+ C to +7 C TSSOP MAX7EEAE+ -4 C to +85 C SSOP MAX7EEAE/+ -4 C to +85 C SSOP MAX7EETE+ -4 C to +85 C TQFN-EP* MAX7EEUE+ -4 C to +85 C TSSOP MAX7EAAE+ -4 C to +5 C SSOP MAX44ECWI+ C to +7 C 8 Wide SO MAX44ECAI+ C to +7 C 8 SSOP MAX44ECUI+ C to +7 C 8 TSSOP MAX44EEWI+ -4 C to +85 C 8 Wide SO MAX44EEAI+ -4 C to +85 C 8 SSOP MAX44EEUI+ -4 C to +85 C 8 TSSOP CWI+ C to +7 C 8 Wide SO CAI+ C to +7 C 8 SSOP CTX+ C to +7 C TQFN- EP* EAI+ -4 C to +85 C 8 SSOP EWI+ -4 C to +85 C 8 WIDE SO EUI+ -4 C to +85 C 8 TSSOP ETX+ -4 C to +85 C TQFN- EP* +Denotes a lead(pb)-free/rohs-compliant package. *EP = Exposed pad. / denotes an automotive qualified part. PROCESS: BICMOS Chip Information Package Information For the latest package outline information and land patterns (footprints), go to Note that a +, #, or - in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. PACKAGE TYPE PACKAGE CODE OUTLINE NO. LAND PATTERN NO. SSOP A TSSOP U TQFN-EP T DIP P+ -4 SSOP A TSSOP U TQFN-EP T Wide SO W SSOP A TSSOP U TQFN T Maxim Integrated

21 ±5k ESD-Protected, µa, Mbps. to 5.5, Revision History REISION NUMBER REISION DATE / DESCRIPTION Added an automotive qualified part to the Ordering Information; changed all the parts listed in the Ordering Information to lead free PAGES CHANGED, Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance. Maxim Integrated Rio Robles, San Jose, CA 954 USA Maxim Integrated The Maxim logo and Maxim Integrated are trademarks of Maxim Integrated Products, Inc.