±15kV ESD-Protected, 1Mbps, 1µA RS-232 Transmitters in SOT23-6

Transcription

1 19-164; Rev 1; 3/ ±15k ESD-Protected, bps, 1 General Description The / single RS-3 transmitters in a SOT3-6 package are for space- and cost-constrained applications requiring minimal RS-3 communications. These devices consume only 15 of supply current from ±4.5 to ±6 supplies. They feature a shutdown input that reduces current consumption to only 1 and forces the transmitter output into a high-impedance state. RS-3 data transmission is guaranteed up to 5kbps with the and up to bps with the. The / are EIA/TIA-3 transmitters that convert CMOS/TTL logic levels to RS-3-compliant signals. The transmitter output is protected to ±15k using the IEC 1-4- Air-Gap Discharge method, to ±8k using the IEC 1-4- Contact Discharge method, and to ±15k per the Human Body Model, ensuring strict compliance with international standards. The / transmitters have a standard inverting output. Applications Features Small 6-Pin SOT3 Package ESD-Protected RS-3 Output ±15k per Human Body Model ±8k per IEC 1-4-, Contact Discharge ±15k per IEC 1-4-, Air-Gap Discharge 15 Operating Supply Current Shutdown Reduces Supply Current to 1 Guaranteed Data Rate bps () 5kbps () Three-State RS-3 Transmitter Output No External Components Ordering Information / Diagnostic Ports Telecommunications PART TEMP. RANGE PIN- PACKAGE TOP MARK Networking Equipment Set-Top Boxes EUT-T EUT-T -4 C to +85 C -4 C to +85 C 6 SOT3-6 6 SOT3-6 AAHD AAHE Digital Cameras Hand-Held Equipment Typical Operating Circuit Pin Configuration 1 TOP IEW CC EE CC C BYPASS1.1µF C BYPASS.1µF GND 5 EE 3 TIN 4 TIN 3 4 GND SOT3-6 CAPACITORS MAY BE POLARIZED OR UNPOLARIZED. Maxim Integrated Products 1 For price, delivery, and to place orders, please contact Maxim Distribution at , or visit Maxim s website at

2 / ABSOLUTE MAXIMUM RATINGS CC to GND (Note 1) to +7 EE to GND (Note 1) to -7 CC to EE (Note 1) TIN, to GND to +7 to GND ( = GND)...±13. to GND ( = CC )...±7 Output Short-Circuit Duration...Continuous Note 1: CC and EE can have maximum magnitudes of 7, but their absolute difference cannot exceed 13. 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 Continuous Power Dissipation (T A = +7 C) 6-Pin SOT3 (derate 8.7mW/ C above +7 C)...691mW Operating Temperature Range...-4 C to +85 C Junction Temperature C Storage Temperature Range C to +15 C Lead Temperature (soldering, 1s)...+3 C ( CC = +4.5 to +6, EE = -4.5 to -6, T A = T MIN to T MAX, unless otherwise noted. Typical values are at CC = +5.4, EE = -5.4, and T A = +5 C.) (Note ) Positive Supply oltage Negative Supply oltage Input Leakage PARAMETER DC CHARACTERISTICS Positive Supply Current Negative Supply Current Shutdown Supply Current INPUT LOGIC (TIN, ) Input Logic Threshold Low Input Logic Threshold High TIN Input Hysteresis TRANSMITTER OUTPUTS Output oltage Swing Output Resistance Output Short-Circuit Current Output Leakage Current TIMING CHARACTERISTICS Maximum Data Rate Transmitter Skew Transition-Region Slew Rate Transmitter Enable Time SYMBOL CC EE I CC I EE IL IH R I t TS t EN = 5 = 5 = CC = 4.5, EE = -4.5, R L = 3kΩ CC = 5.4, EE = -5.4, R L = 3kΩ CC = EE =, = ± R L = 3kΩ, C L = 1pF t PHL - t PLH, Figure 1 R L = 3kΩ to 7kΩ, C L = 15pF to 1pF, measured from -3 to +3 or +3 to -3, CC = 5.4, EE = -5.4, T A = +5 C CONDITIONS OUT = ±1; CC = EE = or CC = 5.4, EE = -5.4; = MIN TYP MAX ±3.7 ± ±.1 ±1 1 ±35 ± ± UNITS m Ω ma Mbps ns /µs µs

3 ELECTRICAL CHARACTERISTICS (continued) ( CC = +4.5 to +6, EE = -4.5 to -6, T A = T MIN to T MAX, unless otherwise noted. Typical values are at CC = +5.4, EE = -5.4, and T A = +5 C.) (Note ) SUPPLY CURRENT (ma) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS ESD PROTECTION SUPPLY CURRENT vs. DATA RATE (C L = 15pF) I CC () I EE () I CC () I EE () /9E toc1 SUPPLY CURRENT (ma) IEC 1-4- Air-Gap Discharge IEC 1-4- Contact Discharge Human Body Model Note : All devices are 1% tested at T A = +5 C. All limits over temperature are guaranteed by design. Typical Operating Characteristics ( CC = +5.4, EE = -5.4, R L = 3kΩ, T A = +5 C, unless otherwise noted.) SUPPLY CURRENT vs. DATA RATE (C L = 1pF) /9E toc SUPPLY CURRENT (ma) ±15 ±8 ±15 SUPPLY CURRENT vs. OUTPUT CAPACITANCE 5kbps 1kbps 4kbps k /9E toc3 / DATA RATE (Mbps) DATA RATE (Mbps) OUTPUT CAPACITANCE (pf) SUPPLY CURRENT (ma) SUPPLY CURRENT vs. OUTPUT CAPACITANCE bps 5kbps 4kbps 4kbps /9E toc4 SLEW RATE (/µs) SLEW RATE vs. OUTPUT CAPACITANCE -SLEW +SLEW /9E toc5 SLEW RATE (/µs) SLEW RATE vs. OUTPUT CAPACITANCE -SLEW +SLEW /9E toc OUTPUT CAPACITANCE (pf) OUTPUT CAPACITANCE (pf) OUTPUT CAPACITANCE (pf) 3

4 / Typical Operating Characteristics (continued) ( CC = +5.4, EE = -5.4, R L = 3kΩ, T A = +5 C, unless otherwise noted.) TRANSMITTER OUTPUT SHUTDOWN WAEFORM 1µs/div /9E toc7 C L = 15pF TRANSMITTER OUTPUT SHUTDOWN WAEFORM 1µs/div /9E toc8 C L = 15pF Pin Description PIN NAME FUNCTION 1 Active-Low Shutdown. Pull low to reduce the supply current and to force into a high-impedance state % 5% GND Ground 3 TIN TTL/CMOS Transmitter Input 4 RS-3 Transmitter Output TIN IH IL 5% t PLH t PHL 5% 5 EE Negative Supply oltage 6 CC Positive Supply oltage Detailed Description The / are EIA/TIA-3 transmitters that convert CMOS/TTL logic levels to RS-3 signals. They operate on ±4.5 to ±6 supplies and feature enhanced electrostatic discharge protection (see ESD Protection). The guarantees a 5kbps data rate, and the guarantees a bps data rate with worst-case loads of 3kΩ in parallel with 1pF. The / invert the signal relative to TIN (standard RS-3). The transmitter input does not have a pull-up resistor and should be connected to GND if unused. Figure 1. Transmitter Propagation-Delay Timing Shutdown The / feature a shutdown input. Drive low to reduce the supply current to 1 (max). Shutdown also forces into a high-impedance state, allowing the signal line to be safely controlled by other transmitters. Drive high for normal operation. ESD Protection As with all Maxim devices, ESD protection structures are incorporated on all pins to protect against ESD encountered during handling and assembly. The / s transmitter output has extra protection against static electricity. Maxim has developed state-ofthe-art structures enabling this pin to withstand ESD up 4

5 to ±15k without damage or latch-up. The / s transmitter output is characterized for protection to the following limits: ±15k using the Human Body Model ±8k using the Contact Discharge method specified in IEC 1-4- ±15k using the Air-Gap Discharge method specified in IEC 1-4- Human Body Model Figure shows the Human Body Model, and Figure 3 shows the current waveform it generates when discharged into a low impedance. This model consists of a 1pF capacitor charged to the ESD voltage of interest, and then discharged into the test device through a 1.5kΩ resistor. IEC 1-4- The IEC 1-4- standard covers ESD testing and performance of finished equipment; it does not specifically refer to ICs. The / enable the design of equipment that meets the highest level (Level 4) of IEC 1-4- without the need for additional ESD-protection components. The major difference between tests done using the Human Body Model and IEC 1-4- is higher peak current in IEC Because series resistance is lower in the IEC 1-4- model, the ESD withstand voltage measured to this standard is generally lower than that measured using the Human Body. Figure 4 shows the IEC 1-4- model, and Figure 5 shows the current waveform for the ±8k IEC 1-4- Level 4 ESD Contact Discharge test. The Air-Gap test involves approaching the device with a charged probe. The Contact Discharge method connects the probe to the device before the probe is energized. Power-Supply Decoupling In most circumstances,.1µf bypass capacitors are adequate for power-supply decoupling. Connect the bypass capacitors as close to the IC as possible. HIGH- OLTAGE DC SOURCE R C Ω CHARGE-CURRENT LIMIT RESISTOR Cs 1pF R D 15Ω DISCHARGE RESISTANCE STORAGE CAPACITOR Figure. Human Body ESD Test Model AMPERES I P 1% 9% 36.8% 1% t RI TIME t DL CURRENT WAEFORM Figure 3. Human Body Model Current Waveform HIGH- OLTAGE DC SOURCE R C 5MΩ TO Ω CHARGE-CURRENT LIMIT RESISTOR Cs 15pF R D 33Ω Ir DISCHARGE RESISTANCE STORAGE CAPACITOR DEICE UNDER TEST PEAK-TO-PEAK RINGING (NOT DRAWN TO SCALE) DEICE UNDER TEST / Figure 4. IEC 1-4- ESD Test Model 5

6 / IPEAK I 1% 9% 1% t R =.7ns TO 1ns 3ns 6ns Figure 5. IEC 1-4- ESD Generator Current Waveform t Applications Information Power-Supply Sources The / require ±4.5 to ±6 dual supplies. For applications where these supply voltages are not present, a DC-DC converter must be added. Due to the /s low current consumption, a charge pump can provide the proper supply voltages and requires a minimal amount of board space and cost. When using another RS-3 device containing an internal regulated charge pump (Table 1), the / may be powered from the internal charge pump (Figure 6). This eliminates the need for additional external DC-DC converters to generate the required ±4.5 to ±6 dual supplies. +3 SUPPLY C BYPASS.1µF CC C3.1µF C1.1µF C1+ C CC EE C.1µF C+ C- C4.1µF (TABLE 1) TIN GND GND Figure 6. Powering the / 6

7 Table 1. RS-3 Devices with Internal Regulated Charge Pumps ±15k ESD AutoShutdown PART NO. OF Tx/Rx AutoShutdown PROTECTION Plus DATA RATE (bps) MAX31 1/1 1k MAX31E 1/1 5k MAX3 / 1k MAX3E / 5k MAX33 / 1k MAX33E / 5k MAX34 / 5k MAX34E / 5k MAX35 / MAX35E / MAX36 1/1 5k MAX36E 1/1 5k MAX37 1/1 MAX37E 1/1 MAX33 / 1k MAX33E / 5k MAX337 5/3 MAX338 5/3 5k MAX341 3/5 1k MAX341E 3/5 5k MAX343 3/5 1k MAX343E 3/5 5k MAX344 3/5 5k MAX344E 3/5 5k MAX345 3/5 MAX345E 3/5 / TRANSISTOR COUNT: 111 Chip Information AutoShutdown and AutoShutdown Plus are trademarks of Maxim Integrated Products. 7

8 / Package Information 6LSOT.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. 8 Maxim Integrated Products, 1 San Gabriel Drive, Sunnyvale, CA Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.