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CMOS RS-232 Drivers/Receivers ADM231L–ADM234L/ADM236L–ADM241L 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. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent ri ghts of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 © 2005 Analog Devices, Inc. All rights reserved.

FEATURES

Meets all EIA-232-E and V.28 specifications 120 kbps data rate On-board dc-to-dc converters ±9 V output swing with 5 V supply Small 1 µF capacitors Low power shutdown ≤1 µA ±30 V receiver input levels Latch-up free

APPLICATIONS

The ADM2xx family of line drivers/receivers is intended for all EIA-232-E and V .28 communications interfaces, especially in applications in which 12 V is not available. The ADM236L and ADM241L feature a low power shutdown mode that reduces power dissipation to less than 5 µW , making them ideally suited for battery-powered equipment. The ADM233L does not require any external components and is particularly useful in applications where printed circuit board space is critical. All members of the ADM2xxL family, except the ADM231L and ADM239L, include two internal charge pump voltage converters that allow operation from a single 5 V supply. These parts convert the 5 V input power to the ±10 V required for RS-232 output ADM236L TYPICAL OPERATING CIRCUIT T1IN T1OUT T2IN T2OUT RS-232 OUTPUTST3IN T4IN R1OUT R1IN R2OUT R2INTTL/CMOS OUTPUTS R3INR3OUT T3OUT T4OUT 1µF +6.3V 1µF +16V C1+ C1– C2– C2+ 1µF +16V +10V TO –10V VOLTAGE INVERTER 1µF +6.3V 1µF +6.3V +5V INPUT VCC+5V TO +10V VOLTAGE DOUBLER SDADM236LGND 00070-0-015 TTL/CMOS INPUTS1 RS-232 INPUTS2 1INTERNAL 400kΩ PULL-UP RESISTOR ON EACH TTL/CMOS INPUT. 2INTERNAL 5kΩ PULL-DOWN RESISTOR ON EACH RS-232 INPUT. EN Figure 1. levels. The ADM231L and ADM239L are designed to operate from 5 V and 12 V supplies. An internal +12 V to −12 V charge pump voltage converter generates the −12 V supply. The ADM2xxL is an enhanced upgrade to the AD2xx family. It features lower power consumption, faster slew rate, and the ability to operate with smaller (1 µF) capacitors. Table 1. Selection Table

ADM231L–ADM234L/ADM236L–ADM241L Rev. C | Page 2 of 20 TABLE OF CONTENTS

REVISION HISTORY

4/05—Rev. B to Rev. C 5/01—Rev. A to Rev. B 1/01—Rev. 0 to Rev. A Removed ESD information from Revision 0: Initial V ersion

ADM231L–ADM234L/ADM236L–ADM241L Rev. C | Page 3 of 20 SPECIFICATIONS VCC = 5 V ± 10% (ADM231L, ADM232L, ADM234L, ADM236L, ADM238L, ADM239L, ADM241L); VCC = 5 V ± 5% (ADM233L and ADM237L); V+ = 7.5 V to 13.2 V (ADM231L and ADM239L); C1 to C4 = 1.0 µF ceramic. All specifications TMIN to TMAX, unless otherwise noted. Table 2. Parameter Min Typ Max Unit Test Conditions/Comments Output Voltage Swing ±5 ±9 V All transmitter outputs loaded with 3 kΩ to ground VCC Power Supply Current 2.5 6.0 mA No load, (ADM232L only) 3.5 13 mA No load V+ Power Supply Current 1.5 4 mA No load, V+ = 12 V (ADM231L and ADM239L only) Shutdown Supply Current 1 10 µA Input Logic Threshold Low, VINL 0.8 V TIN, EN, SD, EN, SD Input Logic Threshold High, VINH 2.0 V TIN, EN, SD, EN, SD Logic Pull-Up Current 12 25 µA RS-232 Input Voltage Range1 –30 +30 V T IN = 0 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 0.65 V RS-232 Input Resistance 3 5 7 kΩ T A = 0°C to 85°C TTL/CMOS Output Voltage Low, VOL 0.4 V TTL/CMOS Output Voltage High, VOH 3.5 V I OUT = −1.0 mA TTL/CMOS Output Leakage Current +0.05 ±10 µA EN = VCC, 0 V ≤ ROUT ≤ VCC Output Enable Time (TEN) 250 ns ADM236L, ADM239L, ADM241L (Figure 31, C L = 150 pF) Output Disable Time (TDIS) 50 ns ADM236L, ADM239L, ADM241L (Figure 31, R L = 1 kΩ) Propagation Delay 0.3 µs RS-232 to TTL Transition Region Slew Rate 8 V/µs R L = 3 kΩ, CL = 2500 pF, measured from +3 V to −3 V or −3 V to +3 V Output Resistance 300 Ω V CC = V+ = V– = 0 V, VOUT = ±2 V RS-232 Output Short-Circuit Current ±10 mA 1 Guaranteed by design.

ADM231L–ADM234L/ADM236L–ADM241L Rev. C | Page 4 of 20 ABSOLUTE MAXIMUM RATINGS TA = 25°C, unless otherwise noted. Table 3. Parameter Rating VCC –0.3 V to +6 V V+ (V CC – 0.3 V) to +14 V V– +0.3 V to −14 V Input Voltages TIN –0.3 V to (V CC + 0.3 V) RIN ±30 V Output Voltages TOUT (V+, +0.3 V) to (V–, –0.3 V) ROUT –0.3 V to (V CC + 0.3 V) Short-Circuit Duration TOUT Continuous Power Dissipation N-14 PDIP (Derate 10 mW/°C above 70°C) 800 mW N-16 PDIP (Derate 10.5 mW/°C above 70°C) 840 mW N-20 PDIP (Derate 11 mW/°C above 70°C) 890 mW N-24-1 PDIP (Derate 13.5 mW/°C above 70°C) 1000 mW R-16 SOIC (Derate 9 mW/°C above 70°C) 760 mW R-24 SOIC (Derate 12 mW/°C above 70°C) 850 mW R-28 SOIC (Derate 12.5 mW/°C above 70°C) 900 mW RS-28 SSOP (Derate 10 mW/°C above 70°C) 900 mW Parameter Rating Q-14 CERDIP (Derate 10 mW/°C above 70°C) 720 mW Q-16 CERDIP (Derate 10 mW/°C above 70•C) 800 mW Q-24 CERDIP (Derate 12.5 mW/°C above 70°C) 1000 mW Thermal Impedance, θJA N-14 PDIP 140°C/W N-16 PDIP 135°C/W N-20 PDIP 125°C/W N-24-1 PDIP 120°C/W R-16 SOIC 105°C/W R-24 SOIC 85°C/W R-28 SOIC 80°C/W RS-28 SSOP 100°C/W Q-14 CERDIP 105°C/W Q-16 CERDIP 100°C/W Q-24 CERDIP 55°C/W Operating Temperature Range Commercial (J Version) 0°C to 70°C Industrial (A Version) −40°C to +85°C Storage Temperature Range −65°C to +150°C Lead Temperature, Soldering 300°C Vapor Phase (60 sec) 215°C Infrared (15 sec) 220° C Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect device reliability. ESD CAUTION ESD (electrostatic discharge) sensiti ve device. Electrostatic charges as hi gh as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although this product features proprietary ESD protection circuitry, permanent dama ge may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality.

Table 4. Pin Function Descriptions VCC Power Supply Input. 5 V ± 10% (5 V ± 5% for ADM233L). require an external 7.5 V to 13.2 V supply. V− Internally Generated Ne gative Supply (−10 V nominal). GND Ground Pin. Must be connected to 0 V. C+ (ADM231L and ADM239L only) External capacito r (+ terminal) is connected to this pin. C− (ADM231L and ADM239L only) External capacito r (– terminal) is connected to this pin. pin. (ADM233L) The capacitor is connected internally and no external connection to this pin is required. pin. (ADM233L) The capacitor is connected internally and no external connection to this pin is required. pin. (ADM233L) Internal capacitor connections, Pin 11 and Pin 15, must be connected together. pin. (ADM233L) Internal capacitor connections, Pin 10 and Pin 16, must be connected together. TOUT Transmitter (Driver) Outputs. These are RS-232 levels (typically ±10 V). RIN Receiver Inputs. These inputs accept RS-232 signal levels. An internal 5 kΩ pull-down resistor to GND is connected on each in put. ROUT Receiver Outputs. These are TTL/CMOS levels. Enable Input. Active low on ADM236L, ADM239L, and ADM241L. This input is used to enable/disable the receiver outputs. facility is useful for connecting to microprocessor systems. is disabled, the receiver outputs are placed in a high impedance state, and the driver outputs are turned off. NC No Connect. No connections are required to this pin. Table 5. ADM236L and ADM241L Truth Table

EIA-232-E minimum requirement. pulls them high, forcing the outputs into a low state. to ground and are protected against overvoltages of up to ±30 V .

2.4 V maximum, which are well within the ±3 V EIA-232-E

and inputs with slow transition times. to less than 5 µW . This is very useful in battery-operated systems. are disabled, their outputs are placed in a high impedance state. diagram for the enable function is shown in Figure 31. Figure 31. Enable Timing rates up to 100 kbps under worst-case loading conditions.

Figure 42. 24-Lead Plastic Dual In-Line Package [PDIP] Figure 43. 24-Lead Ceramic Dual in-Line Package [CERDIP] Figure 44. 24-Lead Standard Small Outline Package [SOIC] Figure 45. 28-Lead Standard Small Outline Package [SOIC]

0.05 MIN

1.652.00 MAX

0.22 SEATING

Figure 46. 28-Lead Shrink Small Outline Package [SSOP]

ADM231L–ADM234L/ADM236L–ADM241L Rev. C | Page 17 of 20 ORDERING GUIDE Model Temperature Range Package Description Package Option ADM231LJN 0°C to 70°C 14-lead PDIP N-14 ADM231LJR 0°C to 70°C 16-lead SOIC R-16 ADM231LJR-REEL 0°C to 70°C 16-lead SOIC R-16 ADM231LJRZ-REEL1 0°C to 70°C 16-lead SOIC R-16 ADM231LAN –40°C to +85°C 14-lead PDIP N-14 ADM231LAQ –40°C to +85°C 14-lead CERDIP Q-14 ADM231LAR –40°C to +85°C 16-lead SOIC R-16 ADM231LAR-REEL –40°C to +85°C 16-lead SOIC R-16 ADM232LJR 0°C to 70°C 16-lead SOIC R-16 ADM232LJR-REEL 0°C to 70°C 16-lead SOIC R-16 ADM232LJRZ1 0°C to 70°C 16-lead SOIC R-16 ADM232LJRZ-REEL71 0°C to 70°C 16-lead SOIC R-16 ADM232LAN –40°C to +85°C 16-lead PDIP N-16 ADM232LAR –40°C to +85°C 16-lead SOIC R-16 ADM232LAR-REEL –40°C to +85°C 16-lead SOIC R-16 ADM232LARZ1 –40°C to +85°C 16-lead SOIC R-16 ADM232LARZ-REEL1 –40°C to +85°C 16-lead SOIC R-16 ADM232LJN 0°C to 70°C 20-lead PDIP N-16 ADM232LJNZ1 0°C to 70°C 20-lead PDIP N-16 ADM233LJN 0°C to 70°C 20-lead PDIP N-20 ADM233LAN –40°C to +85°C 20-lead PDIP N-20 ADM234LJN 0°C to 70°C 16-lead PDIP N-16 ADM234LJR 0°C to 70°C 16-lead SOIC R-16 ADM234LJR-REEL 0°C to 70°C 16-lead SOIC R-16 ADM234LJRZ1 0°C to 70°C 16-lead SOIC R-16 ADM234LJRZ-REEL1 0°C to 70°C 16-lead SOIC R-16 ADM234LAN –40°C to +85°C 16-lead PDIP N-16 ADM234LAQ –40°C to +85°C 16-lead CERDIP Q-16 ADM234LAR –40°C to +85°C 16-lead SOIC R-16 ADM234LAR-REEL –40°C to +85°C 16-lead SOIC R-16 ADM236LJN 0°C to 70°C 24-lead PDIP N-24-1 ADM236LJR 0°C to 70°C 24-lead SOIC R-24 ADM236LJR-REEL 0°C to 70°C 24-lead SOIC R-24 ADM236LAN –40°C to +85°C 24-lead PDIP N-24-1 ADM236LAR –40°C to +85°C 24-lead SOIC R-24 ADM236LAR-REEL –40°C to +85°C 24-lead SOIC R-24 ADM237LJN 0°C to 70°C 24-lead PDIP N-24-1 ADM237LJR 0°C to 70°C 24-lead SOIC R-24 ADM237LJR-REEL 0°C to 70°C 24-lead SOIC R-24 ADM237LJRZ1 0°C to 70°C 24-lead SOIC R-24 ADM237LJRZ-REEL1 0°C to 70°C 24-lead SOIC R-24 ADM237LAN –40°C to +85°C 24-lead PDIP N-24-1 ADM237LAQ –40°C to +85°C 24-lead CERDIP Q-24 ADM237LAR –40°C to +85°C 24-lead SOIC R-24 ADM237LAR-REEL –40°C to +85°C 24-lead SOIC R-24 ADM238LJN 0°C to 70°C 24-lead PDIP N-24-1 ADM238LJNZ1 0°C to 70°C 24-lead PDIP N-24-1 ADM238LJR 0°C to 70°C 24-lead SOIC R-24 ADM238LJR-REEL 0°C to 70°C 24-lead SOIC R-24 ADM238LJRZ1 0°C to 70°C 24-lead SOIC R-24 ADM238LJRZ-REEL1 0°C to 70°C 24-lead SOIC R-24

ADM231L–ADM234L/ADM236L–ADM241L Rev. C | Page 18 of 20 Model Temperature Range Package Description Package Option ADM238LAN –40°C to +85°C 24-lead PDIP N-24-1 ADM238LAQ –40°C to +85°C 24-lead CERDIP Q-24 ADM238LAR –40°C to +85°C 24-lead SOIC R-24 ADM238LAR-REEL –40°C to +85°C 24-lead SOIC R-24 ADM238LARZ1 –40°C to +85°C 24-lead SOIC R-24 ADM238LARZ-REEL1 –40°C to +85°C 24-lead SOIC R-24 ADM239LJN 0°C to 70°C 24-lead PDIP N-24-1 ADM239LJR 0°C to 70°C 24-lead SOIC R-24 ADM239LJR-REEL 0°C to 70°C 24-lead SOIC R-24 ADM239LJRZ1 0°C to 70°C 24-lead SOIC R-24 ADM239LJRZ-REEL1 0°C to 70°C 24-lead SOIC R-24 ADM239LAN –40°C to +85°C 24-lead PDIP N-24-1 ADM239LAQ –40°C to +85°C 24-lead CERDIP Q-24 ADM239LAR –40°C to +85°C 24-lead SOIC R-24 ADM239LAR-REEL –40°C to +85°C 24-lead SOIC R-24 ADM241LJR 0°C to 70°C 28-lead SOIC R-28 ADM241LJR-REEL 0°C to 70°C 28-lead SOIC R-28 ADM241LJRZ1 0°C to 70°C 28-lead SOIC R-28 ADM241LJRZ-REEL1 0°C to 70°C 28-lead SOIC R-28 ADM241LAR –40°C to +85°C 28-lead SOIC R-28 ADM241LAR-REEL –40°C to +85°C 28-lead SOIC R-28 ADM241LJRS 0°C to 70°C 28-lead SSOP RS-28 ADM241LJRS-REEL 0°C to 70°C 28-lead SSOP RS-28 ADM241LARS –40°C to +85°C 28-lead SSOP RS-28 ADM241LARS-REEL –40°C to +85°C 28-lead SSOP RS-28 1 Z = Pb-free part.

ADM231L–ADM234L/ADM236L–ADM241L Rev. C | Page 19 of 20 NOTES

ADM231L–ADM234L/ADM236L–ADM241L Rev. C | Page 20 of 20 NOTES © 2005 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. C00070–0–4/05(C)