High-Speed, 5 V, 0.1 F a CMOS RS-232 Drivers/Receivers ADM222/ADM232A/ADM242 FEATURES FUNCTIONAL BLOCK DIAGRAM 200 kB/s Transmission Rate 5V INPUT Small (0.1 F) Charge Pump Capacitors Single 5 V Power Supply 0.1 F Meets All EIA-232-E and V.28 Specifications Two Drivers and Two Receivers 0.1 F V CC C1+ +5V TO +10V On-Board DC-DC Converters 0.1 F V+ VOLTAGE DOUBLER 9 V Output Swing with 5 V Supply C1 30 V Receiver Input Levels C2+ +5V TO 10V V 0.1 F VOLTAGE INVERTER Pin Compatible with MAX222/MAX232A/MAX242 0.1 F C2 APPLICATIONS Computers T1 T1 T1 IN OUT TTL/CMOS Peripherals RS-232 INPUTS* OUTPUTS T2 Modems T2 T2 IN OUT Printers R1 R1 R1 IN OUT Instruments RS-232 TTL/CMOS OUTPUTS INPUTS** R2 R2 R2 OUT IN ADM2xx EN (ADM242) (ADM222, ADM242) GENERAL DESCRIPTION SHDN GND The ADM222, ADM232A, ADM242 are a family of high-speed * INTERNAL 400k PULL-UP RESISTOR RS-232 line drivers/receivers offering transmission rates up to ON EACH TTL/CMOS INPUT ** INTERNAL 5k PULL-DOWN RESISTOR 200 kB/s. Operating from a single 5 V power supply, a highly ON EACH RS-232 INPUT efficient on-chip charge pump using small (0.1 F) external capacitors allows RS-232 bipolar levels to be developed. Two RS-232 drivers and two RS-232 receivers are provided on each device. functions are disabled. The ADM222 is available in 18-lead The devices are fabricated on BiCMOS, an advanced mixed DIP and in a wide surface-mount (SOIC) package. technology process that combines low power CMOS with high- The ADM242 combines both shutdown (SHDN) and enable speed bipolar circuitry. This allows for transmission rates up to (EN) functions. The shutdown function reduces the supply 200 kB/s, yet minimizes the quiescent power supply current to current to 0.1 mA. During shutdown, the transmitters are dis- under 5 mA. abled but the receivers continue to operate normally. The The ADM232A is a pin-compatible, high-speed upgrade for the enable function allows the receiver outputs to be disabled AD232 and for the ADM232L. It is available in 16-lead DIP thereby facilitating sharing a common bus. The ADM242 is and in both narrow and wide surface-mount (SOIC) packages. available in 18-lead DIP and in a wide surface-mount (SOIC) package. The ADM222 contains an additional shutdown (SHDN) func- tion that may be used to disable the device, thereby reducing the supply current to 0.1 A. During shutdown, all transmit/receive REV. C Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. use, nor for any infringements of patents or other rights of third parties Tel: 781.329.4700 2016 Analog Devices, Inc. All rights reserved. which may result from its use. No license is granted by implication or www.analog.com Technical Support otherwise under any patent or patent rights of Analog Devices.(V = 5 V 10%. C1C4 = 0.1 F all spec- CC ADM222/ADM232A/ADM242SPECIFICATIONS ifications T to T unless otherwise noted.) MIN MAX Parameter Min Typ Max Unit Test Conditions/Comments RS-232 TRANSMITTERS Output Voltage Swing 5 9 V All Transmitter Outputs Loaded with 3 k to Ground Input Logic Threshold Low, V 1.7 0.8 V T INL IN Input Logic Threshold High, V 2.4 1.7 V T INH IN Logic Pull-Up Current 12 40 AT = 0 V IN Data Rate 200 kB/s Output Resistance 300 V = V+ = V = 0 V, V = 2 V CC OUT Output Short Circuit Current (Instantaneous) 10 mA RS-232 RECEIVERS RS-232 Input Voltage Range 30 +30 V RS-232 Input Threshold Low 0.8 1.2 V RS-232 Input Threshold High 1.6 2.4 V RS-232 Input Hysteresis 0.2 0.4 1.0 V V = 5 V CC RS-232 Input Resistance 3 5 7 k T = 0C to 85C A TTL/CMOS Output Voltage Low, V 0.05 0.4 V I = 3.2 mA OL OUT TTL/CMOS Output Voltage High, V 3.5 V I = 1.0 mA OH OUT TTL/CMOS Output Short-Circuit Current 2 85 mA Source Current (V = GND)* OUT TTL/CMOS Output Short-Circuit Current 10 35 mA Sink Current (V = V )* OUT CC TTL/CMOS Output Leakage Current 0.05 10 A SHDN = GND/EN = V CC 0 V V V OUT CC EN Input Threshold Low, V 1.4 0.8 V INL EN Input Threshold High, V 2.0 1.4 V INH POWER SUPPLY Power Supply Current 4 8 mA No Load 13 mA 3 k Load on Both Outputs Shutdown Power Supply Current 0.1 10 A SHDN Input Leakage Current 1 A SHDN Input Threshold Low, V 1.4 0.8 V INL SHDN Input Threshold High, V 2.0 1.4 V INH AC CHARACTERISTICS = 50 pF to 1000 pF, R = 3 k to 7 k Transition Region Slew Rate 3 8 30 V/sC L L Measured from +3 V to 3 V or 3 V to +3 V Transmitter Propagation Delay TTL to RS-232 0.85 3.5 st PHLT 1.0 3.5 st PLHT Receiver Propagation Delay RS-232 to TTL 0.1 0.5 st PHLR 0.3 0.5 st PLHR Receiver Output Enable Time 125 500 ns t ER Receiver Output Disable Time 160 500 ns t DR Transmitter Output Enable Time 250 s SHDN Goes High Transmitter Output Disable Time 3.5 s SHDN Goes Low Transmitter + to Propagation Delay Difference 150 ns Receiver + to Propagation Delay Difference 200 ns *Guaranteed by design, not production tested. Specifications subject to change without notice. 2 REV. C