5 V-Powered CMOS RS-232 Drivers/Receivers ADM231LADM234L/ADM236LADM241L FEATURES ADM236L TYPICAL OPERATING CIRCUIT Single 5 V power supply +5V INPUT Meets all EIA-232-E and V.28 specifications V C1+ +5V TO +10V CC 1F 1F 120 kbps data rate VOLTAGE 1 F +6.3V +6.3V +6.3V DOUBLER C1 V+ On-board dc-to-dc converters 9 V output swing with 5 V supply C2+ +10V TO 10V 1F VOLTAGE V Small 1 F capacitors +16V 1F INVERTER C2 +16V Low power shutdown 1 A T1 T1 T1 IN OUT 30 V receiver input levels Latch-up free T2 T2 T2 IN OUT TTL/CMOS 1 INPUTS RS-232 T3 T3 T3 APPLICATIONS IN OUT OUTPUTS Computers T4 T4 IN T4 OUT Peripherals Modems R1 R1 R1 OUT IN Printers RS-232 TTL/CMOS R2 R2 R2 OUT IN 2 INPUTS OUTPUTS Instruments R3 R3 R3 OUT IN GENERAL DESCRIPTION EN SD GND ADM236L The ADM2xx family of line drivers/receivers is intended for all EIA-232-E and V.28 communications interfaces, especially in 1 INTERNAL 400k PULL-UP RESISTOR ON EACH TTL/CMOS INPUT. applications in which 12 V is not available. The ADM236L and 2 INTERNAL 5k PULL-DOWN RESISTOR ON EACH RS-232 INPUT. ADM241L feature a low power shutdown mode that reduces Figure 1. power dissipation to less than 5 W, making them ideally suited for battery-powered equipment. The ADM233L does not levels. The ADM231L and ADM239L are designed to operate require any external components and is particularly useful in from 5 V and 12 V supplies. An internal +12 V to 12 V charge applications where printed circuit board space is critical. pump voltage converter generates the 12 V supply. All members of the ADM2xxL family, except the ADM231L and The ADM2xxL is an enhanced upgrade to the AD2xx family. It ADM239L, include two internal charge pump voltage converters features lower power consumption, faster slew rate, and the that allow operation from a single 5 V supply. These parts convert ability to operate with smaller (1 F) capacitors. the 5 V input power to the 10 V required for RS-232 output Table 1. Selection Table TTL Part No. of RS-232 No. of RS-232 External Low Power No. of Three-State EN Number Power Supply Voltage Drivers Receivers Capacitors Shutdown (SD) Pins ADM231L 5 V and 7.5 V to 13.2 V 2 2 2 No No 14 ADM232L 5 V 2 2 4 No No 16 ADM233L 5 V 2 2 None No No 20 ADM234L 5 V 4 0 4 No No 16 ADM236L 5 V 4 3 4 Yes Yes 24 ADM237L 5 V 5 3 4 No No 24 ADM238L 5 V 4 4 4 No No 24 ADM239L 5 V and 7.5 V to 13.2 V 3 5 2 No Yes 24 ADM241L 5 V 4 5 4 Yes Yes 28 Rev. C Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Specifications subject to change without notice. No license is granted by implication Tel: 781.329.4700 www.analog.com or otherwise under any patent or patent rights of Analog Devices. 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All rights reserved. 00070-0-015ADM231LADM234L/ADM236LADM241L TABLE OF CONTENTS Specifications..................................................................................... 3 General Information ...................................................................... 12 Absolute Maximum Ratings............................................................ 4 Circuit Description .................................................................... 12 ESD Caution.................................................................................. 4 Application Hints ....................................................................... 13 Pin Configurations and Function Descriptions ........................... 5 Outline Dimensions....................................................................... 14 Typical Performance Characteristics ............................................. 8 Ordering Guide .......................................................................... 17 Typical Operating Circuits .............................................................. 9 REVISION HISTORY 4/05Rev. B to Rev. C Updated Format..................................................................Universal Removed ADM223, ADM230L, and ADM235L............Universal Changed Hysteresis Level..................................................Universal Changes to Specifications Table...................................................... 3 Updated Outline Dimensions ....................................................... 14 Changes to Ordering Guide .......................................................... 17 5/01Rev. A to Rev. B Edits to Test Conditions/Comments of Specifications................ 2 1/01Rev. 0 to Rev. A Removed ESD information from Features section ...................... 1 Changes to Specifications Table...................................................... 2 Removed ESD information from Absolute Maximum Ratings section .............................................. 2 Revision 0: Initial Version Rev. C Page 2 of 20