1µA Supply-Current, True +3V to +5.5V RS-232 Transceivers with AutoShutdown

Transcription

1 9-; Rev ; /99 µa Supply-Current, True + to +. RS- Transceivers with AutoShutdown General Description The MAX/MAX/MAX achieve µa supply current with Maxim s revolutionary AutoShutdown feature. When the MAX/MAX/MAX do not sense a valid signal level on their receiver inputs, the on-board power supply and drivers shut down. This occurs if the RS- cable is disconnected or if the transmitters of the connected peripheral are turned off. The system turns on again when a valid level is applied to any RS- receiver input. As a result, the system saves power without changes to the existing BIOS or operating system. The MAX/MAX/MAX transceivers are powered EIA/TIA- and.8/. communications interfaces intended for notebook computer applications. A proprietary, high-efficiency, dual charge-pump power supply and a low-dropout transmitter combine to deliver true RS- performance from a single +. to +. supply. A guaranteed data rate of kbps provides compatibility with popular software for communicating with personal computers. The MAX/MAX/MAX require only capacitors in. operation, and can operate from input voltages ranging from +. to +.. They are ideal for.-only systems, mixed. and. systems, or.-only systems that require true RS- performance. The MAX is a -driver/-receiver -pin SSOP version of the -pin MAX (-driver/-receiver). The MAX -driver/-receiver, complete serial port is ideal for notebook or subnotebook computers. The MAX includes one complementary always-active receiver. This receiver can monitor an external device (such as a modem) in shutdown, without forward biasing the protection diodes in a UART that may have completely removed. Selector Guide PART Tx Rx RANGE () AutoShutdown MAX MAX MAX. to.. to.. to. Yes Yes Yes Pin Configurations appear at end of data sheet. Typical Operating Circuits appear at end of data sheet. Future product contact factory for availability. AutoShutdown is a trademark of Maxim Integrated Products. Features µa Supply Current Achieved with AutoShutdown Small Capacitors True RS- Operation from CC = +. to +. Meets EIA/TIA- Specifications Down to.7 Guaranteed kbps Data Rate /µs Min Guaranteed Slew Rate Smallest Single-Supply RS- Transceiver (MAX) Guaranteed Mouse Driveability (MAX) Small TSSOP Package (MAX/MAX) Applications Notebook, Subnotebook, and Palmtop Computers Battery-Powered Equipment Hand-Held Equipment Peripherals Printers Ordering Information PART TEMP. RANGE PIN-PACKAGE MAXCAE MAXCUE C to +7 C C to +7 C SSOP TSSOP MAXEAE - C to +8 C SSOP MAXEUE - C to +8 C TSSOP MAXCPP C to +7 C Plastic DIP MAXCAP C to +7 C SSOP MAXCUP C to +7 C TSSOP MAXEPP - C to +8 C Plastic DIP MAXEAP - C to +8 C SSOP MAXEUP - C to +8 C TSSOP MAXCWI C to +7 C 8 Wide SO MAXCAI C to +7 C 8 SSOP MAXCUI C to +7 C 8 TSSOP MAXEWI - C to +8 C 8 Wide SO MAXEAI - C to +8 C 8 SSOP MAXEUI - C to +8 C 8 TSSOP MAX/MAX/MAX* * Covered by U.S. Patent numbers,,9;,79,;,777,77;,797,899;,89,;,897,77;,999,7; and other patents pending. Maxim Integrated Products For free samples & the latest literature: or phone For small orders, phone

2 µa Supply-Current, True + to +. RS- Transceivers with AutoShutdown MAX/MAX/MAX ABSOLUTE MAXIMUM RATINGS...-. to + + (Note )...-. to +7 - (Note )...+. to (Note )...+ Input oltages T_IN,,, EN (MAX)...-. to + R_IN...± Output oltages T_OUT...±. R_OUT,...-. to ( +.) Short-Circuit Duration T_OUT...Continuous Continuous Power Dissipation (T A = +7 C) -Pin SSOP (derate 7.mW/ C above +7 C)...7mW -Pin TSSOP (derate.7mw/ C above +7 C)...mW -Pin Plastic DIP (derate.mw/ C above +7 C)...889mW -Pin SSOP (derate 8.mW/ C above +7 C)...mW -Pin TSSOP DIP (derate 7.mW/ C above +7 C)...9mW 8-Pin Wide SO (derate.mw/ C above +7 C)...W 8-Pin SSOP (derate 9.mW/ C above +7 C)...7mW 8-Pin TSSOP (derate 8.7mW/ C above +7 C)...9mW Operating Temperature Ranges MAX C... C to +7 C MAX E...- C to +8 C Storage Temperature Range...- C to + C Lead Temperature (soldering, sec)...+ C Note : + and - can have maximum magnitudes of 7, but their absolute difference cannot exceed. 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 ( = +. to +., C C = (Note ), T A = T MIN to T MAX, unless otherwise noted. Typical values are at T A = + C.) PARAMETER DC CHARACTERISTICS Input Logic Threshold Low Input Logic Threshold High Input Leakage Current Output Leakage Current Output oltage Low Output oltage High T_IN,,, EN (MAX) T_IN, EN,, T_IN, EN,, Receivers disabled I OUT =.ma I OUT = -.ma CONDITIONS =. =. MIN TYP MAX All R_IN open, =, Supply Current, AutoShutdown. µa =. = Supply Current, Shutdown or., =. µa Supply Current, T A = + C = =,.. ma AutoShutdown Disabled no load LOGIC INPUTS AND RECEIER OUTPUTS AUTOSHUTDOWN ( =, = ) Receiver Input Thresholds to Transmitters Enabled Receiver Input Thresholds to Transmitters Disabled Receiver Threshold to Transmitters Enabled (t WU ) Receiver Positive or Negative Threshold to High (t INH ) Receiver Positive or Negative Threshold to Low (t INL ) Figure Positive threshold Negative threshold ±. ±. ±. ± µa supply current, Figure -.. Output oltage Low I OUT =.ma. Output oltage High I OUT = -.ma -. Figure µs Figure µs Figure µs UNITS µa µa

3 µa Supply-Current, True + to +. RS- Transceivers with AutoShutdown ELECTRICAL CHARACTERISTICS (continued) ( = +. to +., C C = (Note ), T A = T MIN to T MAX, unless otherwise noted. Typical values are at T A = + C.) Receiver input to receiver output, C L = pf Receiver Output Enable Time Normal operation ns Transmitter Skew PARAMETER CONDITIONS MIN TYP MAX UNITS RECEIER INPUTS Input oltage Range - Input Threshold Low Input Threshold High Output oltage Swing Output Resistance = + = - =, transmitter output = ± M Ω Output Short-Circuit Current ± ± ma Output Leakage Current OUT = ±, = or. to., ± µa transmitters disabled Transition-Region Slew Rate t PLH.. Input Hysteresis. Input Resistance T A = + C 7 kω TRANSMITTER OUTPUTS MOUSE DRIEABILITY (MAX) Transmitter Output oltage TIMING CHARACTERISTICS ±. ±. Maximum Data Rate R L = kω, C L = pf, one transmitter switching kbps Receiver Propagation Delay Receiver Output Disable Time Receiver Skew T A = + C T A = + C =. =. =. =. All transmitter outputs loaded with kω to ground TIN = TIN =, TIN =, TOUT loaded with kω to, TOUT and TOUT loaded with.ma each.8. t PHL Normal operation t PHL - t PLH MAX/MAX MAX t PHL - t PLH MAX/MAX MAX =., R L = kω to 7kΩ, C L = pf to pf 8. T A = + C, measured from + to - or - to + C L = pf to pf ±. µs ns ns ns /µs MAX/MAX/MAX Note : C C =, tested at. ±%. C =.7µF, C C =.µf, tested at. ±%.

4 µa Supply-Current, True + to +. RS- Transceivers with AutoShutdown MAX/MAX/MAX TRANSMITTER OUTPUT OLTAGE () TRANSMITTER OUTPUT OLTAGE () Typical Operating Characteristics ( = +., bps data rate, capacitors, all transmitters loaded with kω, T A = + C, unless otherwise noted.) MAX/MAX TRANSMITTER OUTPUT OLTAGE vs. LOAD CAPACITANCE OUT+ OUT- LOAD CAPACITANCE (pf) MAX TRANSMITTER OUTPUT OLTAGE vs. LOAD CAPACITANCE TRANSMITTER AT bps TRANSMITTERS AT kbps OUT + OUT - LOAD CAPACITANCE (pf) MAX/- MAX/- SLEW RATE (/µs) SLEW RATE (/µs) 8 8 MAX/MAX SLEW RATE vs. LOAD CAPACITANCE +SLEW -SLEW FOR DATA RATES UP TO bps LOAD CAPACITANCE (pf) 8 8 MAX SLEW RATE vs. LOAD CAPACITANCE -SLEW +SLEW ALL OUTPUTS LOADED WITH kω +C L CHARGE-PUMP CAPACITORS FOR ALL DATA RATES UP TO bps LOAD CAPACITANCE (pf) MAX/- MAX/- MAX SUPPLY CURRENT (ma) SUPPLY CURRENT (ma) MAX/MAX SUPPLY CURRENT vs. LOAD CAPACITANCE WHEN TRANSMITTING DATA bps kbps kbps MAX/- LOAD CAPACITANCE (pf) MAX SUPPLY CURRENT vs. LOAD CAPACITANCE WHEN TRANSMITTING DATA bps kbps kbps LOAD CAPACITANCE (pf) MAX/- MAX SUPPLY CURRENT (ma)

5 µa Supply-Current, True + to +. RS- Transceivers with AutoShutdown Pin Description MAX PIN MAX 7 9, 8, 7,, 8 MAX 8 9,,,, 9 NAME EN C+ C- C- - R_IN T_OUT T_IN R_OUT ROUTB Receiver Enable Control. Drive low for normal operation. Drive high to force the receiver outputs into a high-z state. Positive terminal of inverting charge-pump capacitor Negative terminal of inverting charge-pump capacitor -. generated by the charge pump RS- Receiver Inputs RS- Transmitter Outputs TTL/CMOS Transmitter Inputs TTL/CMOS Receiver Outputs FUNCTION Noninverting Receiver Output active in shutdown Output of the valid signal detector. Indicates if a valid RS- level is present on receiver inputs logic. Drive low to shut down transmitters and on-board power supply. This overrides all automatic circuitry and (Table ). Drive high to override automatic circuitry keeping transmitters on ( must be high) (Table ). Negative terminal of the voltage doubler charge-pump capacitor Ground MAX/MAX/MAX 9 +. to +. Supply oltage generated by the charge pump 8 C+ Positive terminal of the voltage doubler charge-pump capacitor Detailed Description Dual Charge-Pump oltage Converter The MAX/MAX/MAX s internal power supply consists of a regulated dual charge pump that provides output voltages of +. (doubling charge pump) and -. (inverting charge pump), regardless of the input voltage ( ) over the +. to +. range. The charge pumps operate in a discontinuous mode: if the output voltages are less than., the charge pumps are enabled; if the output voltages exceed., the charge pumps are disabled. Each charge pump requires a flying capacitor (C, C) and a reservoir capacitor (C, C) to generate the + and - supplies. RS- Transmitters The transmitters are inverting level translators that convert CMOS-logic levels to. EIA/TIA- levels. They guarantee a kbps data rate with worst-case loads of kω in parallel with pf, providing compatibility with PC-to-PC communication software (such as Laplink ). Typically, the MAX/MAX/MAX can operate at data rates of bps. Transmitters can be paralleled to drive multiple receivers or mice (MAX). Figure shows a complete system connection. When is driven to ground, or the Auto- Shutdown circuitry senses invalid voltage levels at all receiver inputs, the transmitters are disabled and the outputs are forced into a high-impedance state. LapLink is a trademark of Traveling Software.

6 µa Supply-Current, True + to +. RS- Transceivers with AutoShutdown MAX/MAX/MAX POWER MANAGEMENT UNIT OR KEYBOARD CONTROLLER CPU I/O CHIP WITH UART MAX RS- UART PROTECTION DIODE TO µp Rx Tx LOGIC TRANSITION DETECTOR SHDN = I PREIOUS RS- (a) OLDER RS-: POWERED-DOWN UART DRAWS CURRENT FROM ACTIE RECEIER OUTPUT IN SHUTDOWN. Figure. Interface Under Control of PMU RS- Receivers The MAX/MAX/MAX s receivers convert RS- signals to CMOS-logic output levels. All receivers have one inverting three-state output. In shutdown ( = low) or in AutoShutdown, the MAX/MAX s receivers are active (Table ). Driving EN high places the receiver(s) in a high-impedance state. The MAX s receivers are high impedance when the part is shut down. The MAX has an always-active complementary output (ROUTB). ROUTB is an extra output that monitors receiver activity while the other receivers are high impedance. This allows Ring Indicator to be monitored without forward biasing other devices connected to the receiver outputs. This is ideal for systems where is set to in shutdown to accommodate peripherals, such as UARTs (Figure ). UART PROTECTION DIODE Rx Tx ROUTB ROUT THREE-STATED TIN = MAX (b) NEW MAX: 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 MAX detects RS- activity when the UART and interface are shut down. I RIN TOUT

7 µa Supply-Current, True + to +. RS- Transceivers with AutoShutdown Table a. MAX/MAX and Enable Control Truth Table High-Z High-Z Active* Active* Table b. MAX Control Truth Table EN T_OUT High-Z Active* T_OUT R_OUT High-Z Active* R_OUT Active High-Z Active High-Z ROUTB Active Active *Note: If the part is in AutoShutdown mode ( =, = ), it is shut down if no valid RS- levels are present on all receiver inputs. AutoShutdown A µa supply current is achieved with Maxim s new AutoShutdown feature, which operates when is low and is high. When the MAX/MAX/MAX sense no valid signal levels on all receiver inputs for µs, the on-board power supply and drivers are shut off, reducing supply current to µa. This occurs if the RS- cable is disconnected or the connected peripheral transmitters are turned off. The system turns on again when a valid level is applied to any RS- receiver input. As a result, the system saves power without changes to the existing BIOS or operating system. When using AutoShutdown, the output is high when the device is on and low when the device is shut down. Because indicates the receiver inputs condition, it can be used in any mode (Figure ). Table and Figure c summarize the MAX/ MAX/MAX operating modes. and override the automatic circuitry and force the transceiver into its normal operating state or into its low-power standby state. When neither control is asserted, the IC selects between these states automatically based on receiver input levels. Figures a, b, and a depict valid and invalid RS- receiver levels. A mouse or other system with AutoShutdown may need time to wake up. Figure shows a circuit that forces the transmitters on for ms, allowing enough time for the +. R_IN -. TO MAX POWER SUPPLY µs AND TRANSMITTERS COUNTER R * TRANSMITTERS ARE DISABLED, REDUCING SUPPLY CURRENT TO µa IF ALL RECEIER INPUTS ARE BETWEEN +. AND -. FOR AT LEAST µs. Figure a. MAX Entering µa Supply Mode via AutoShutdown +.7 R_IN -.7 POWER MANAGEMENT UNIT MASTER SHDN LINE µs COUNTER R MAX MAX MAX Figure. AutoShutdown with Initial Turn-On to Wake Up a Mouse or Another System M TO MAX POWER SUPPLY * TRANSMITTERS ARE ENABLED IF: ANY RECEIER INPUT IS GREATER THAN +.7 OR LESS THAN -.7. ANY RECEIER INPUT HAS BEEN BETWEEN +. AND -. FOR LESS THAN µs. Figure b. MAX with Transmitters Enabled Using AutoShutdown IS AN INTERNALLY GENERATED SIGNAL THAT IS USED BY THE AUTOSHUTDOWN LOGIC AND APPEARS AS AN OUTPUT OF THE DEICE. POWER DOWN IS ONLY AN INTERNAL SIGNAL. IT CONTROLS THE OPERATIONAL STATUS OF THE TRANSMITTERS AND THE POWER SUPPLIES. Figure c. AutoShutdown Logic POWER DOWN MAX/MAX/MAX 7

8 µa Supply-Current, True + to +. RS- Transceivers with AutoShutdown MAX/MAX/MAX Table. AutoShutdown Logic RS- SIGNAL PRESENT AT RECEIER INPUT INPUT INPUT other system to realize that the MAX/MAX/ MAX is awake. If the other system outputs valid RS- signals within that time, the RS- ports on both systems remain enabled. When shut down, the device s charge pumps are turned off, + decays to CC, - decays to ground, and the transmitter outputs are disabled (high impedance). The time required to exit shutdown is typically µs (Figure b). Software-Controlled Shutdown If direct software control is desired, can be used to indicate DTR or Ring Indicator signal. Tie and together to bypass Auto- Shutdown so the line acts like a SHDN input. Applications Information Capacitor Selection The capacitor type used for C C is not critical for proper operation; either polarized or nonpolarized capacitors may be used. The charge pump requires capacitors for. operation. For other supply voltages, refer to 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 C can be increased without changing C s value. However, do not increase C without also increasing the values of C, C, and C 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) usually rises at low temperatures and influences the amount of ripple on + and -. OUTPUT Yes H X H Normal Operation TRANSCEIER STATUS No H H L Normal Operation (Forced On) No H L L Shutdown (AutoShutdown) Yes L X H Shutdown (Forced Off) No L X L Shutdown (Forced Off) RECEIER INPUT LEELS (a) RECEIER INPUT OLTAGE () OUTPUT () (b) TRANSMITTERS ENABLED, HIGH AUTOSHUTDOWN, TRANSMITTERS DISABLED, µa SUPPLY CURRENT, LOW TRANSMITTERS ENABLED, HIGH t INL INDETERMINATE INDETERMINATE Figure. AutoShutdown Trip Levels t INH REGION t WU 8

9 µa Supply-Current, True + to +. RS- Transceivers with AutoShutdown /div /div = +. C C = µs/div Figure. Transmitter Outputs when Exiting Shutdown or Powering Up Power-Supply Decoupling In most circumstances a bypass capacitor is adequate. In applications that are sensitive to powersupply noise, decouple CC to ground with a capacitor of the same value as the charge-pump capacitor C. Connect bypass capacitors as close to the IC as possible. Transmitter Outputs when Exiting Shutdown Figure shows two transmitter outputs when exiting shutdown mode. As they become active, the two transmitter outputs are shown going to opposite RS- levels. Each 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. Figure 7a shows the MAX s transmitter output voltage vs. current per transmitter. Figure 7b is a mouse driver test circuit. T T TRANSMITTER OUTPUT OLTAGE () =. T T OUT + T OUT - OUT + OUT - 7 LOAD CURRENT PER TRANSMITTER (ma) Figure 7a. MAX Transmitter Output oltage vs. Load Current per Transmitter Microsoft. The MAX successfully drove all serial mice and met their respective current and voltage requirements. Figure 7a shows the transmitter outputs under increasing load current. The MAX s switching regulator ensures the transmitters will supply at least ± during worst-case conditions. The AutoShutdown feature does not work with a mouse, so and should be connected to. High Data Rates The MAX/MAX/MAX maintain the RS- ±. minimum transmitter output voltage even at high data rates. Figure 8 shows a transmitter loopback test circuit. Figure 9 shows a loopback test result at kbps, and Figure shows the same test at bps. For Figure 9, all three transmitters were driven simultaneously at kbps into RS- loads in parallel with pf. For Figure, a single transmitter was driven at bps, but all three transmitters were loaded with an RS- receiver in parallel with pf. MAX- MAX/MAX/MAX Mouse Driveability (MAX) The MAX has been specifically designed to power serial mice while operating from low-voltage power supplies. It has been tested with samples of ten major mouse models from six manufacturers including the leading three: Logitech ( models), Mouse Systems, and Interconnection with and Logic The MAX/MAX/MAX can directly interface with various logic families, including ACT and HCT CMOS. See Table for more information on possible combinations of interconnections. 9

10 µa Supply-Current, True + to +. RS- Transceivers with AutoShutdown MAX/MAX/MAX C C LOGIC INPUTS C+ C- C+ C- TIN TIN TIN ROUTB ROUT MAX TOUT 9 TOUT TOUT RIN C C COMPUTER SERIAL PORT Tx 8 ROUT RIN LOGIC OUTPUTS 7 ROUT RIN RS- INPUTS ROUT RIN 7 ROUT RIN 8 SERIAL MOUSE TO POWER MANAGEMENT UNIT Figure 7b. Mouse Driver Test Circuit

11 µa Supply-Current, True + to +. RS- Transceivers with AutoShutdown C C C+ C- C- C+ T_ IN R_ OUT EN (MAX/) MAX MAX MAX Figure 8. Loopback Test Circuit + - T_ OUT R_ IN C C pf Table. Required Capacitor alues () Table. Logic Family Compatibility with arious Supply oltages SYSTEM POWER- SUPPLY OLTAGE () SUPPLY OLTAGE ()... C (µf) C, C, C (µf). to.... to..7.. to...7 COMPATIBILITY Compatible with all CMOS families. Compatible with all TTL and CMOS-logic families. Compatible with ACT and HCT CMOS, and with TTL. Incompatible with AC, HC, or CD CMOS. MAX/MAX/MAX TIN /div TIN /div TOUT /div TOUT /div ROUT /div ROUT /div = +., kbps C C = µs/div = +., bps C C = µs/div Figure 9. Loopback Test Result at kbps Figure. Loopback Test Result at bps

12 µa Supply-Current, True + to +. RS- Transceivers with AutoShutdown MAX/MAX/MAX Typical Operating Circuits C C C C C C TTL/CMOS INPUTS C+ C- C- C+ C- TIN ROUT EN C+ C+ TIN TIN MAX 9 MAX TOUT RIN 8 7 TOUT 7 TOUT 8 C C TO POWER MANAGEMENT UNIT C C RS- OUTPUTS C C LOGIC INPUTS LOGIC OUTPUTS C+ C- C+ C- C- TIN TIN TIN ROUTB ROUT ROUT ROUT ROUT ROUT MAX + - TOUT 9 TOUT TOUT RIN RIN RIN RIN 7 RIN 8 7 C C RS- OUTPUTS RS- INPUTS ROUT RIN TTL/CMOS OUTPUTS ROUT RIN 9 RS- INPUTS TO POWER MANAGEMENT UNIT EN TO POWER MANAGEMENT UNIT 8

13 µa Supply-Current, True + to +. RS- Transceivers with AutoShutdown -Powered EIA/TIA- and EIA/TIA- Transceivers from Maxim PART MAX MAX8 MAX MAX MAX MAX MAX MAX MAX MAX MAX POWER- SUPPLY OLTAGE (). to..8 to..7 to.. to..7 to.. to.. to.. to.. to.. to.. to. No. OF TRANSMITTERS/ RECEIERS / / / / / / / / / / / No. OF RECEIERS ACTIE IN SHUTDOWN N/A GUAR- ANTEED DATA RATE (kbps) EIA/TIA- OR FEATURES Drives mice Operates directly from batteries without a voltage regulator kbps guaranteed data rate capacitors AutoShutdown, complementary receiver, drives mice, transient detection capacitors, -pin SSOP capacitors, MAX pinout capacitors, AutoShutdown capacitors, MAX pinout capacitors, complementary receivers, drives mice capacitors, AutoShutdown complementary receiver, drives mice MAX/MAX/MAX

14 µa Supply-Current, True + to +. RS- Transceivers with AutoShutdown MAX/MAX/MAX Pin Configurations TOP IEW EN EN C+ + C+ + C TOUT C- MAX TOUT C+ MAX RIN C+ C- - 7 TIN C- - TOUT 7 8 ROUT TIN RIN 8 SSOP/TSSOP 9 ROUT RIN ROUT 9 TIN C+ DIP/SSOP/TSSOP 8 C+ C- - RIN 7 + RIN C- MAX RIN RIN RIN TOUT TOUT TOUT TIN TIN TIN ROUTB ROUT ROUT ROUT ROUT ROUT SO/SSOP/TSSOP Chip Information MAX TRANSISTOR COUNT: 9 MAX TRANSISTOR COUNT: 9 MAX TRANSISTOR COUNT: 7

15 µa Supply-Current, True + to +. RS- Transceivers with AutoShutdown Package Information SSOP.EPS TSSOP.EPS MAX/MAX/MAX

16 µa Supply-Current, True + to +. RS- Transceivers with AutoShutdown MAX/MAX/MAX Package Information (continued) PDIPN.EPS SOICW.EPS 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. Maxim Integrated Products, San Gabriel Drive, Sunnyvale, CA Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.