±15 kV ESD Protected, 3.3 V, RS-232 Line Driver/Receiver ADM3232E FEATURES FUNCTIONAL BLOCK DIAGRAM +3.3V INPUT Data rate: 460 kbps 2 Tx and 2 Rx Meets EIA-232E specifications 0.1 μF charge pump capacitors ESD protection to IEC 1000-4-2 (801.2) on RS-232 I/Os Contact discharge: ±8 kV Air gap discharge: ±15 kV C2 + 0.1µF 10V C2+ +6.6V TO –6.6V VOLTAGE C2– INVERTER + V– + General-purpose RS-232 data link Portable instruments Handsets Industrial/telecom diagnostic ports C1+ +3.3V TO +6.6V VCC VOLTAGE C1– V+ DOUBLER C3 0.1µF 6.3V C4 0.1µF 10V T1IN T1 T1OUT T2IN T2 T2OUT TTL/CMOS INPUTS + APPLICATIONS ADM3232E C1 + 0.1µF 10V C5 0.1µF RS-232 OUTPUTS R1 R1OUT TTL/CMOS OUTPUTS R1IN 5kΩ R2 R2OUT RS-232 INPUTS* R2IN 5kΩ *INTERNAL 5kΩ PULL-DOWN RESISTOR ON EACH RS-232 INPUT. 06410-001 GND Figure 1. GENERAL DESCRIPTION The ADM3232E transceiver is a high speed, 2-channel RS-232/V.28 interface device that operates from a single 3.3 V power supply. Low power consumption makes it ideal for battery-powered portable instruments. The ADM3232E conforms to the EIA-232E and ITU-T V.28 specifications and operates at data rates up to 460 kbps. Emissions are also controlled to within very strict limits. CMOS technology is used to keep the power dissipation to an absolute minimum, allowing maximum battery life in portable applications. All RS-232 (TxOUT and RxIN) inputs and outputs are protected against electrostatic discharges (up to ±15 kV ESD protection). This ensures compliance with IEC 1000-4-2 requirements. The ADM3232E is available in a 16-lead narrow and wide SOIC packages, as well as a space-saving 16-lead TSSOP. Four external 0.1 μF charge pump capacitors are used for the voltage doubler/inverter, permitting operation from a single 3.3 V supply. This device is ideally suited for operation in electrically harsh environments or where RS-232 cables are frequently plugged/ unplugged, with the ±15 kV ESD protection of the ADM3232E RS-232 input/output pins. Rev. B 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 rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©2006–2011 Analog Devices, Inc. All rights reserved. ADM3232E TABLE OF CONTENTS Features .............................................................................................. 1 Pin Configuration and Function Descriptions..............................5 Applications....................................................................................... 1 Typical Performance Characteristics ..............................................6 Functional Block Diagram .............................................................. 1 Theory of Operation .........................................................................8 General Description ......................................................................... 1 Circuit Description .......................................................................8 Revision History ............................................................................... 2 High Baud Rate..............................................................................8 Specifications..................................................................................... 3 Outline Dimensions ..........................................................................9 Absolute Maximum Ratings............................................................ 4 Ordering Guide .......................................................................... 10 ESD Caution.................................................................................. 4 REVISION HISTORY 4/11—Rev. A to Rev. B Changes to Features Section and General Description Section ................................................................................................ 1 Change to ESD Protection (RS-232 I/O Pins) Parameter, Table 1 ................................................................................................ 3 Change to ESD Protection on RS-232 Pins Section Heading..... 8 7/08—Rev. 0 to Rev. A Added 16-Lead SOIC .........................................................Universal Updated Outline Dimensions ......................................................... 9 Changes to Ordering Guide .......................................................... 10 12/06—Revision 0: Initial Version Rev. B | Page 2 of 12 ADM3232E SPECIFICATIONS VCC = 3.3 V ± 0.3 V, C1 to C4 = 0.1 μF; all specifications TMIN to TMAX, unless otherwise noted. Table 1. Parameter DC CHARACTERISTICS Operating Voltage Range VCC Power Supply Current LOGIC Input Logic Threshold Low, VINL Input Logic Threshold High, VINH TTL/CMOS Output Voltage Low, VOL TTLCMOS Output Voltage High, VOH Logic Pull-Up Current Transmitter Input Hysteresis RS-232 RECEIVER Input Voltage Range Input Threshold Low Input Threshold High Input Hysteresis Input Resistance RS-232 TRANSMITTER Output Voltage Swing (RS-232) Output Voltage Swing (RS-562) Transmitter Output Resistance Output Short-Circuit Current (RS-232) TIMING CHARACTERISTICS Maximum Data Rate Receiver Propagation Delay tPHL tPLH Transmitter Propagation Delay Receiver Output Enable Time Receiver Output Disable Time Transmitter Skew Receiver Skew Transition Region Slew Rate Min Typ Max Unit Test Conditions/Comments 3.0 3.3 1.3 5.5 3 V mA No load 0.8 V V V V μA V 2.0 0.4 VCC − 0.6 5 0.5 −30 0.6 3 ±5.0 ±3.7 300 10 +30 1.2 1.6 0.4 5 2.4 7 ±5.2 ±15 460 5.5 0.4 0.4 300 200 200 30 300 10 1 1 1.2 30 TIN TIN IOUT = 1.6 mA IOUT = −1 mA TIN = GND to VCC V V V V kΩ V V Ω mA VCC = 3.3 V, all transmitter outputs loaded with 3 kΩ to ground VCC = 3.0 V VCC = 0 V, VOUT = ±2 V kbps VCC = 3.3 V, RL = 3 kΩ to 7 kΩ, CL = 50 pF to 1000 pF, one Tx switching μs μs μs ns ns ns ns V/μs RL = 3 kΩ, CL = 1000 pF Measured from +3 V to −3 V or −3 V to +3 V, VCC = 3.3 V; RL = 3 kΩ, CL = 1000 pF, TA = 25°C ESD PROTECTION (RS-232 I/O PINS) ±15 ±15 ±8 kV kV kV Rev. B | Page 3 of 12 Human body model IEC 1000-4-2 air discharge IEC 1000-4-2 contact discharge ADM3232E ABSOLUTE MAXIMUM RATINGS TA = 25°C, unless otherwise noted. Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Table 2. Parameter VCC V+ V− Input Voltages TxIN RxIN Output Voltages TxOUT RxOUT Short-Circuit Duration TxOUT Power Dissipation R-16/RW-16 (Derate 6 mW/°C Above 50°C) θJA, Thermal Impedance Power Dissipation RU-16 (Derate 6 mW/°C Above 50°C) θJA, Thermal Impedance Operating Temperature Range Industrial (A Version) Storage Temperature Range Lead Temperature (Soldering, 10 sec) Rating −0.3 V to +6 V (VCC − 0.3 V) to 14 V +0.3 V to –14 V −0.3 V to (VCC + 0.3 V) ±30 V ESD CAUTION ±15 V −0.3 V to (VCC + 0.3 V) Continuous 450 mW 158°C/W 500 mW 158°C/W −40°C to +85°C −65°C to +150°C JEDEC industry-standard J-STD-020 Rev. B | Page 4 of 12 ADM3232E C1+ 1 16 VCC V+ 2 15 GND C1– 3 ADM3232E 14 4 TOP VIEW (Not to Scale) T1OUT C2+ 13 R1IN C2– 5 12 R1OUT V– 6 11 T1IN T2OUT 7 10 T2IN R2IN 8 9 R2OUT 06410-002 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS Figure 2. Pin Configuration Table 3. Pin Function Descriptions Pin No. 1, 3 Mnemonic C1+, C1– 2 4, 5 V+ C2+, C2– 6 7, 14 8, 13 V– T2OUT, T1OUT R2IN, R1IN 9, 12 10, 11 15 16 R2OUT, R1OUT T2IN, T1IN GND VCC Description External Capacitor 1 is connected between these pins. A 0.1 μF capacitor is recommended, but larger capacitors of up to 47 μF can be used. Internally Generated Positive Supply (6 V Nominal). External Capacitor 2 is connected between these pins. A 0.1 μF capacitor is recommended, but larger capacitors of up to 47 μF can be used. Internally Generated Negative Supply (−6 V Nominal). Transmitter (Driver) Outputs. These are RS-232 signal levels (typically ±6 V). Receiver Inputs. These inputs accept RS-232 signal levels. An internal 5 kΩ pull-down resistor to GND is connected on each input. Receiver Outputs. These are TTL/CMOS output logic levels. Transmitter (Driver) Inputs. These inputs accept TTL/CMOS levels. Ground Pin. Must be connected to 0 V. Power Supply Input (3.3 V ± 0.3 V). Rev. B | Page 5 of 12 ADM3232E TYPICAL PERFORMANCE CHARACTERISTICS 8 8 TxOUT (HIGH) 6 6 4 2 2 V+, V– (V) 0 –2 –2 –4 –4 TxOUT (LOW) 0 200 V– –6 400 600 800 LOAD CAPACITANCE (pF) 1200 1000 –8 06410-003 –6 –8 0 0 2 4 6 8 LOAD CURRENT (mA) 10 12 06410-006 TxOUT (V) V+ 4 Figure 6. Charge Pump V+, V− vs. Load Current Figure 3. Transmitter Output Voltage High/Low vs. Load Capacitance @ 460 kbps 350 8 TxOUT HIGH 6 300 V+ (IMPEDANCE) 4 IMPEDANCE (Ω) 250 0 –2 200 V– (IMPEDANCE) 150 100 –4 TxOUT LOW 50 –6 2.9 3.1 VCC (V) 3.3 0 2.7 06410-004 –8 2.7 3.5 Figure 4. Transmitter Output Voltage vs. VCC 2.9 3.1 VCC (V) 3.3 06410-007 TxOUT (V) 2 3.5 Figure 7. Charge Pump Impedance vs. VCC 8 20 18 6 TxOUT HIGH ICC @ 460kbps 16 4 ICC (mA) 0 –2 ICC @ 230kbps 10 8 6 –4 4 TxOUT LOW –6 2 0 2 4 6 8 LOAD CURRENT (mA) 10 12 0 06410-005 –8 12 Figure 5. Transmitter Output Voltage High/Low vs. Load Current 0 1000 2000 LOAD CAPACITANCE (pF) Figure 8. Power Supply Current vs. Load Capacitance Rev. B | Page 6 of 12 3000 06410-008 TxOUT (V) 14 2 ADM3232E T 1 T CH 1 5.00V CH 2 5.00V M1.00µs CH1 0V 06410-009 2 Figure 9. 460 kbps Data Transmission Rev. B | Page 7 of 12 ADM3232E THEORY OF OPERATION The ADM3232E is a single-channel RS-232 line driver/receiver. Step-up voltage converters, coupled with level-shifting transmitters and receivers, allow RS-232 levels to be developed while operating from a single 3.3 V supply. S1 VCC S3 C1 S2 + C3 S4 V+ = 2VCC + VCC 06410-011 GND INTERNAL OSCILLATOR CMOS technology is used to keep the power dissipation to an absolute minimum, allowing maximum battery life in portable applications. Figure 11. Charge Pump Voltage Doubler CIRCUIT DESCRIPTION • • • FROM VOLTAGE DOUBLER A charge pump voltage converter A 3.3 V logic to RS-232 transmitter An RS-232 to 3.3 V logic receiver Capacitor C3 and Capacitor C4 are used to reduce the output ripple. Their values are not critical and can be increased, if desired. Capacitor C3 is shown connected between V+ and VCC. It is also acceptable to connect this capacitor between V+ and GND. If desired, larger capacitors (up to 10 μF) can be used for Capacitor C1 to Capacitor C4. ADM3232E + T1 T1IN + V– C3 0.1µF 6.3V C4 0.1µF 10V + C2+ +6.6V TO –6.6V VOLTAGE C2– INVERTER R1 R1OUT R1IN 5kΩ R2 R2OUT C4 V– = –(V+) Figure 12. Charge Pump Voltage Inverter 3.3 V Logic to RS-232 Transmitter The drivers convert 3.3 V logic input levels into RS-232 output levels. With VCC = 3.3 V and driving an RS-232 load, the output voltage swing is typically ±6 V. RS-232 to 3.3 V Logic Receiver The receivers are inverting level shifters that accept RS-232 input levels and translate them into 3 V logic output levels. The inputs have internal 5 kΩ pull-down resistors to ground and are protected against overvoltages up to ±30 V. Unconnected inputs are pulled to 0 V by the internal 5 kΩ pull-down resistor. This results in a Logic 1 output level for unconnected inputs or for inputs connected to GND. HIGH BAUD RATE T2OUT TTL/CMOS OUTPUTS S4 All RS-232 (TxOUT and RxIN) inputs and outputs are protected against electrostatic discharges (up to ±15 kV). This ensures compliance with IEC 1000-4-2 requirements. RS-232 OUTPUTS T2 C2 ESD Protection on RS-232 Pins C5 0.1µF T1OUT TTL/CMOS INPUTS T2IN S2 The receivers have Schmitt trigger inputs with a hysteresis level of 0.4 V. This ensures error-free reception for both noisy inputs and for inputs with slow transition times. +3.3V INPUT C2 + 0.1µF 10V GND + INTERNAL OSCILLATOR The charge pump voltage converter consists of a 200 kHz oscillator and a switching matrix. The converter generates a ±6.6 V supply from the input 3.3 V level. This is accomplished in two stages by using a switched capacitor technique as shown in Figure 10. First, the 3.3 V input supply is doubled to 6.6 V by using Capacitor C1 as the charge storage element. The +6.6 V level is then inverted to generate −6.6 V, using C2 as the storage element. C1+ +3.3V TO +6.6V VCC VOLTAGE C1– V+ DOUBLER S3 + GND Charge Pump Voltage Converter C1 + 0.1µF 10V S1 V+ 06410-012 The internal circuitry consists of the following main sections: RS-232 INPUTS* R2IN 5kΩ *INTERNAL 5kΩ PULL-DOWN RESISTOR ON EACH RS-232 INPUT. 06410-010 GND The ADM3232E features high slew rates, permitting data transmission at rates well in excess of the EIA-232E specifications. RS-232 voltage levels are maintained at data rates up to 460 kbps, even under worst-case loading conditions. The slew rate is internally controlled to less than 30 V/μs to minimize EMI interference. Figure 10. Typical Operating Circuit Rev. B | Page 8 of 12 ADM3232E OUTLINE DIMENSIONS 10.00 (0.3937) 9.80 (0.3858) 4.00 (0.1575) 3.80 (0.1496) 9 16 1 6.20 (0.2441) 5.80 (0.2283) 8 1.27 (0.0500) BSC 0.25 (0.0098) 0.10 (0.0039) COPLANARITY 0.10 0.50 (0.0197) 0.25 (0.0098) 1.75 (0.0689) 1.35 (0.0531) SEATING PLANE 0.51 (0.0201) 0.31 (0.0122) 45° 8° 0° 0.25 (0.0098) 0.17 (0.0067) 1.27 (0.0500) 0.40 (0.0157) COMPLIANT TO JEDEC STANDARDS MS-012-AC 060606-A CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN. Figure 13. 16-Lead Standard Small Outline Package [SOIC_N] Narrow Body (R-16) Dimensions shown in millimeters (and inches) 5.10 5.00 4.90 16 9 4.50 4.40 4.30 6.40 BSC 1 8 PIN 1 1.20 MAX 0.15 0.05 0.65 BSC 0.30 0.19 COPLANARITY 0.10 0.20 0.09 SEATING PLANE 8° 0° COMPLIANT TO JEDEC STANDARDS MO-153-AB Figure 14. 16-Lead Thin Shrink Small Outline Package [TSSOP] (RU-16) Dimensions shown in millimeters Rev. B | Page 9 of 12 0.75 0.60 0.45 ADM3232E 10.50 (0.4134) 10.10 (0.3976) 9 16 7.60 (0.2992) 7.40 (0.2913) 10.65 (0.4193) 10.00 (0.3937) 8 1.27 (0.0500) BSC 0.30 (0.0118) 0.10 (0.0039) COPLANARITY 0.10 0.75 (0.0295) 45° 0.25 (0.0098) 2.65 (0.1043) 2.35 (0.0925) SEATING PLANE 0.51 (0.0201) 0.31 (0.0122) 8° 0° 0.33 (0.0130) 0.20 (0.0079) COMPLIANT TO JEDEC STANDARDS MS-013-AA CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN. 1.27 (0.0500) 0.40 (0.0157) 03-27-2007-B 1 Figure 15. 16-Lead Standard Small Outline Package [SOIC_W] Wide Body (RW-16) Dimensions shown in millimeters (and inches) ORDERING GUIDE Model 1 ADM3232EARNZ ADM3232EARNZ-REEL7 ADM3232EARUZ ADM3232EARUZ-REEL7 ADM3232EARWZ ADM3232EARWZ-REEL 1 Temperature Range –40°C to +85°C –40°C to +85°C –40°C to +85°C –40°C to +85°C –40°C to +85°C –40°C to +85°C Package Description 16-Lead SOIC_N 16-Lead SOIC_N 16-Lead TSSOP 16-Lead TSSOP 16-Lead SOIC_W 16-Lead SOIC_W Z = RoHS Compliant Part. Rev. B | Page 10 of 12 Package Option R-16 R-16 RU-16 RU-16 RW-16 RW-16 ADM3232E NOTES Rev. B | Page 11 of 12 ADM3232E NOTES ©2006–2011 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D06410-0-4/11(B) Rev. B | Page 12 of 12