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15 kv esd protected, 3.3 v, rs-232 line driver/receiver adm3232e 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 ?2006C2011 analog devices, inc. all rights reserved. features data rate: 460 kbps 2 tx and 2 rx meets eia-232e specifications 0.1 f 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 applications general-purpose rs-232 data link portable instruments handsets industrial/telecom diagnostic ports functional block diagram c1+ c2+ c1? c2? v cc v? v+ t1 in t1 out t2 in t2 out r1 out r1 in r2 out r2 in ttl/cmos inputs rs-232 outputs ttl/cmos outputs rs-232 inputs* t1 t2 r1 r2 + + + c1 0.1f 10v c2 0.1f 10v gnd adm3232e c3 0.1f 6.3v +3.3v inpu t +3.3v to +6.6v voltage doubler +6.6v to ?6.6v voltage inverter c5 0.1f + c4 0.1f 10v + *internal 5k ? pull-down resistor on each rs-232 input. 5k? 5k? 06410-001 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. all rs-232 (tx out and rx in ) inputs and outputs are protected against electrostatic discharges (up to 15 kv esd protection). this ensures compliance with iec 1000-4-2 requirements. 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. 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. four external 0.1 f charge pump capacitors are used for the voltage doubler/inverter, permitting operation from a single 3.3 v supply. the adm3232e is available in a 16-lead narrow and wide soic packages, as well as a space-saving 16-lead tssop.
adm3232e rev. b | page 2 of 12 table of contents features .............................................................................................. 1 applications....................................................................................... 1 functional block diagram .............................................................. 1 general description ......................................................................... 1 revision history ............................................................................... 2 specifications..................................................................................... 3 absolute maximum ratings............................................................ 4 esd caution.................................................................................. 4 pin configuration and function descriptions..............................5 typical performance characteristics ..............................................6 theory of operation .........................................................................8 circuit description .......................................................................8 high baud rate..............................................................................8 outline dimensions ..........................................................................9 ordering guide .......................................................................... 10 revision history 4/11rev. a to rev. b changes to features section and general description section . ............................................................................................... 1 chan ge to esd protection (rs-232 i/o pins) parameter, table 1 ................................................................................................ 3 change to esd protection on rs-232 pins section heading..... 8 7/08rev. 0 to rev. a added 16-lead soic .........................................................universal updated outline dimensions ......................................................... 9 changes to ordering guide .......................................................... 10 12/06revision 0: initial version
adm3232e rev. b | page 3 of 12 specifications v cc = 3.3 v 0.3 v, c1 to c4 = 0.1 f; all specifications t min to t max , unless otherwise noted. table 1. parameter min typ max unit test conditions/comments dc characteristics operating voltage range 3.0 3.3 5.5 v v cc power supply current 1.3 3 ma no load logic input logic threshold low, v inl 0.8 v t in input logic threshold high, v inh 2.0 v t in ttl/cmos output voltage low, v ol 0.4 v i out = 1.6 ma ttlcmos output voltage high, v oh v cc ? 0.6 v i out = ? 1 ma logic pull-up current 5 10 a t in = gnd to v cc transmitter input hysteresis 0.5 v rs-232 receiver input voltage range ?30 +30 v input threshold low 0.6 1.2 v input threshold high 1.6 2.4 v input hysteresis 0.4 v input resistance 3 5 7 k rs-232 transmitter output voltage swing (rs-232) 5.0 5.2 v v cc = 3.3 v, all transmitter outputs loaded with 3 k to ground output voltage swing (rs-562) 3.7 v v cc = 3.0 v transmitter output resistance 300 v cc = 0 v, v out = 2 v output short-circuit current (rs-232) 15 ma timing characteristics maximum data rate 460 kbps v cc = 3.3 v, r l = 3 k to 7 k, c l = 50 pf to 1000 pf, one tx switching receiver propagation delay t phl 0.4 1 s t plh 0.4 1 s transmitter propagation delay 300 1.2 s r l = 3 k, c l = 1000 pf receiver output enable time 200 ns receiver output disable time 200 ns transmitter skew 30 ns receiver skew 300 ns transition region slew rate 5.5 10 30 v/s measured from +3 v to ?3 v or ? 3 v to +3 v, v cc = 3.3 v; r l = 3 k, c l = 1000 pf, t a = 25c esd protection (rs-232 i/o pins) 15 kv human body model 15 kv iec 1000-4-2 air discharge 8 kv iec 1000-4-2 contact discharge
adm3232e rev. b | page 4 of 12 absolute maximum ratings t a = 25c, unless otherwise noted. table 2. parameter rating v cc ?0.3 v to +6 v v+ (v cc ? 0.3 v) to 14 v v? +0.3 v to C14 v input voltages tx in ?0.3 v to (v cc + 0.3 v) rx in 30 v output voltages tx out 15 v rx out ?0.3 v to (v cc + 0.3 v) short-circuit duration tx out continuous power dissipation r-16/rw-16 450 mw (derate 6 mw/c above 50c) ja , thermal impedance 158c/w power dissipation ru-16 500 mw (derate 6 mw/c above 50c) ja , thermal impedance 158c/w operating temperature range industrial (a version) ?40c to +85c storage temperature range ?65c to +150c lead temperature (soldering, 10 sec) jedec industry-standard j-std-020 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. esd caution
adm3232e rev. b | page 5 of 12 pin configuration and fu nction descriptions c1+ 1 v+ 2 c1? 3 c2+ 4 v cc 16 gnd 15 t1 out 14 r1 in 13 c2? 5 r1 out 12 v? 6 t1 in 11 t2 out 7 t2 in 10 r2 in 8 r2 out 9 adm3232e top view (not to scale) 06410-002 figure 2. pin configuration table 3. pin function descriptions pin no. mnemonic description 1, 3 c1+, c1C external capacitor 1 is connected between these pins. a 0.1 f capacitor is recommended, but larger capacitors of up to 47 f can be used. 2 v+ internally generated positive supply (6 v nominal). 4, 5 c2+, c2C external capacitor 2 is connected between these pins. a 0.1 f capacitor is recommended, but larger capacitors of up to 47 f can be used. 6 vC internally generated negative supply (?6 v nominal). 7, 14 t2 out , t1 out transmitter (driver) outputs. these are rs-232 signal levels (typically 6 v). 8, 13 r2 in , r1 in receiver inputs. these inputs accept rs-232 signal levels. an internal 5 k pull-down resistor to gnd is connected on each input. 9, 12 r2 out , r1 out receiver outputs. these are ttl/cmos output logic levels. 10, 11 t2 in , t1 in transmitter (driver) inputs. these inputs accept ttl/cmos levels. 15 gnd ground pin. must be connected to 0 v. 16 v cc power supply input (3.3 v 0.3 v).
adm3232e rev. b | page 6 of 12 typical performance characteristics load capacitance (pf) 8 6 4 2 0 ?2 ?4 ?6 ?8 0 1200 200 400 600 800 tx out (v) 1000 tx out (high) tx out (low) 0 6410-003 figure 3. transmitter output voltage high/low vs. load capacitance @ 460 kbps v cc (v) 8 2.7 2.9 3.1 3.3 3.5 tx out (v) 6 4 2 0 ?2 ?4 ?6 ?8 06410-004 tx out low tx out high figure 4. transmitter output voltage vs. v cc load current (ma) 8 02468 tx out (v) 6 4 2 0 ?2 ?4 ?6 ?8 10 12 tx out high tx out low 06410-005 figure 5. transmitter output voltage high/low vs. load current load current (ma) 8 02468 v+ v+, v? (v) 6 4 2 0 ?2 ?4 ?6 ?8 v? 10 12 06410-006 figure 6. charge pump v+, v? vs. load current v cc (v) 350 2.7 2.9 3.1 3.3 3.5 impedance ( ? ) 300 250 200 150 100 50 0 v+ (impedance) v? (impedance) 06410-007 figure 7. charge pump impedance vs. v cc load capacitance (pf) 20 0 1000 2000 3000 i cc @ 230kbps i cc (ma) 18 16 14 12 10 2 0 8 6 4 i cc @ 460kbps 06410-008 figure 8. power supply current vs. load capacitance
adm3232e rev. b | page 7 of 12 1 ch 1 5.00v ch 2 5.00v m1.00s ch1 2 t 06410-009 t 0v figure 9. 460 kbps data transmission
adm3232e rev. b | page 8 of 12 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. cmos technology is used to keep the power dissipation to an absolute minimum, allowing maximum battery life in portable applications. circuit description the internal circuitry consists of the following main sections: ? a charge pump voltage converter ? a 3.3 v logic to rs-232 transmitter ? an rs-232 to 3.3 v logic receiver charge pump voltage converter 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. 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 v cc . it is also acceptable to connect this capacitor between v+ and gnd. if desired, larger capacitors (up to 10 f) can be used for capacitor c1 to capacitor c4. c1+ c2+ c1? c2? v cc v? v+ t1 in t1 out t2 in t2 out r1 out r1 in r2 out r2 in ttl/cmos inputs rs-232 outputs ttl/cmos outputs rs-232 inputs* t1 t2 r1 r2 + + + c1 0.1f 10v c2 0.1f 10v gnd adm3232e c3 0.1f 6.3v +3.3v inpu t +3.3v to +6.6v voltage doubler +6.6v to ?6.6v voltage inverter c5 0.1f + c4 0.1f 10v + *internal 5k ? pull-down resistor on each rs-232 input. 5k? 5k? 06410-010 figure 10. typical operating circuit c1 + c3 + s3 s4 s1 s2 internal oscillator v cc gnd v cc v+ = 2v cc 06410-011 figure 11. charge pump voltage doubler c2 + c4 + s3 s4 s1 s2 internal oscillator v+ gnd v? = ?(v+) gnd from voltage doubler 06410-012 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 v cc = 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 k pull-down resistors to ground and are pro- t ected against overvoltages up to 30 v. unconnected inputs ar e pulled to 0 v by the internal 5 k pull-down resistor. this results in a logic 1 output level for unconnected inputs or for inputs connected to gnd. 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. esd protection on rs-232 pins all rs-232 (tx out and rx in ) inputs and outputs are protected against electrostatic discharges (up to 15 kv). this ensures compliance with iec 1000-4-2 requirements. high baud rate the adm3232e features high slew rates, permitting data trans- mission 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/s to minimize emi interference.
adm3232e rev. b | page 9 of 12 outline dimensions 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. compliant to jedec standards ms-012-ac 10.00 (0.3937) 9.80 (0.3858) 16 9 8 1 6.20 (0.2441) 5.80 (0.2283) 4.00 (0.1575) 3.80 (0.1496) 1.27 (0.0500) bsc seating plane 0.25 (0.0098) 0.10 (0.0039) 0.51 (0.0201) 0.31 (0.0122) 1.75 (0.0689) 1.35 (0.0531) 0.50 (0.0197) 0.25 (0.0098) 1.27 (0.0500) 0.40 (0.0157) 0.25 (0.0098) 0.17 (0.0067) coplanarity 0.10 8 0 060606-a 45 figure 13. 16-lead standard small outline package [soic_n] narrow body (r-16) dimensions shown in millimeters (and inches) 16 9 8 1 pin 1 seating plane 8 0 4.50 4.40 4.30 6.40 bsc 5.10 5.00 4.90 0.65 bsc 0.15 0.05 1.20 max 0.20 0.09 0.75 0.60 0.45 0.30 0.19 coplanarity 0.10 compliant to jedec standards mo-153-ab figure 14. 16-lead thin shrink small outline package [tssop] (ru-16) dimensions shown in millimeters
adm3232e rev. b | page 10 of 12 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. compliant to jedec standards ms-013-aa 10.50 (0.4134) 10.10 (0.3976) 0.30 (0.0118) 0.10 (0.0039) 2.65 (0.1043) 2.35 (0.0925) 10.65 (0.4193) 10.00 (0.3937) 7.60 (0.2992) 7.40 (0.2913) 0 . 7 5 ( 0 . 0 2 9 5 ) 0 . 2 5 ( 0 . 0 0 9 8 ) 45 1.27 (0.0500) 0.40 (0.0157) c oplanarity 0.10 0.33 (0.0130) 0.20 (0.0079) 0.51 (0.0201) 0.31 (0.0122) seating plane 8 0 16 9 8 1 1.27 (0.0500) bsc 03-27-2007-b figure 15. 16-lead standard small outline package [soic_w] wide body (rw-16) dimensions shown in millimeters (and inches) ordering guide model 1 temperature range package description package option adm3232earnz C40c to +85c 16-lead soic_n r-16 adm3232earnz-reel7 C40c to +85c 16-lead soic_n r-16 adm3232earuz C40c to +85c 16-lead tssop ru-16 adm3232earuz-reel7 C40c to +85c 16-lead tssop ru-16 adm3232earwz C40c to +85c 16-lead soic_w rw-16 adm3232earwz-reel C40c to +85c 16-lead soic_w rw-16 1 z = rohs compliant part.
adm3232e rev. b | page 11 of 12 notes
adm3232e rev. b | page 12 of 12 notes ?2006C2011 analog devices, inc. all rights reserved. trademarks and registered trademarks are the property of their respective owners. d06410-0-4/11(b)

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