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february 2008 rev 9 1/16 16 st232ab st232ac very high speed, ultra low power consumption 5 v powered rs-232 drivers and receivers features supply voltage range: 4.5 to 5.5 v supply current no load (typ): 1.5 ma transmitter output voltage swing (typ): 9 v transition slew rate (typ.): 12 v/s receiver propagation delay (typ.): 0.1 s receiver input voltage range: 30 v data rate (typ.): 400 kbps/s operating temperature range: ? -40 to 85 c ? 0 to 70 c description the st232ab/ac is a 2 driver, 2 receiver device following eia/tia-232 and v.28 communication standard. it is particularly suitable for applications where 12 v is not available. the st232ab/ac uses a single 5 v power supply and only four external capacitors (0.1 f). typical applications are in: portable computers, low power modems, interfaces translation, battery powered rs-232 networks. . tssop16 so-16 table 1. device summary order codes temperature range packages packaging st232acdr 0 to 70 c so-16 (tape and reel) 2500 parts per reel st232abdr -40 to 85 c so-16 (tape and reel) 2500 parts per reel st232actr 0 to 70 c tssop16 (tape and reel) 2500 parts per reel st232abtr -40 to 85 c tssop16 (tape and reel) 2500 parts per reel www.st.com
st232ab - st232ac 2/16 contents 1 pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 5 typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 6 package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 7 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
st232ab - st232ac pin configuration 3/16 1 pin configuration figure 1. pin connections (top view) table 2. pin description pin n symbol note 1c 1 + positive terminal for the first charge pump capacitor 2 v+ doubled voltage terminal 3c 1 - negative terminal for the first charge pump capacitor 4c 2 + positive terminal for the second charge pump capacitor 5c 2 - negative terminal for the second charge pump capacitor 6 v- inverted voltage terminal 7t2 out second transmitter output voltage 8r2 in second receiver input voltage 9r2 out second receiver output voltage 10 t2 in second transmitter input voltage 11 t1 in first transmitter input voltage 12 r1 out first receiver output voltage 13 r1 in first receiver input voltage 14 t1 out first transmitter output voltage 15 gnd ground 16 v cc supply voltage
maximum ratings st232ab - st232ac 4/16 2 maximum ratings note: absolute maximum ratings are those values beyond which damage to the device may occur. functional operation under these condition is not implied. table 3. absolute maximum ratings symbol parameter value unit v cc supply voltage -0.3 to 6 v v+ extra positive voltage (v cc - 0.3 to 13.2) v v- extra negative voltage 0.3 to -13.2 v t in transmitter input voltage range -0.3 to (v cc + 0.3) v r in receiver input voltage range 30 v t out transmitter output voltage range 15 v r out receiver output voltage range -0.3 to (v cc + 0.3) v t sctout short circuit duration on t out infinite
st232ab - st232ac electrical characteristics 5/16 3 electrical characteristics table 4. electrical characteristics (c 1 - c 4 = 0.1 f, v cc = 5 v 10 %, t a = -40 to 85 c, unless otherwise specified. typical values are referred to t a = 25 c). symbol parameter test cond ition min. typ. max. unit i supply v cc power supply current no load, t a = 25c 1.5 4 ma table 5. transmitter electrical characteristics (c 1 - c 4 = 0.1 f, v cc = 5v 10 %, t a = -40 to 85 c, unless otherwise specified. typical values are referred to t a = 25 c). symbol parameter test condition min. typ. max. unit v tout output voltage swing all transmitter outputs are loaded with 3k to gnd 5 9v i til logic pull-up current t in = 0v 5 40 a v til input logic threshold low 0.8 1.4 v v tih input logic threshold high 1.4 2 v sr t transition slew rate t a = 25c, v cc = 5v r l = 3 to 7k , c l = 50 to 2500pf (1) 61230v/s d r data rate (2) 200 400 kbits/s r tout transmitter output resistance v cc = v+ = v- = 0v v out = 2v 300 i sc transmitter output short circuit current one t xout to gnd 7 22 ma t dt propagation delay time ttl-cmos in to rs-232 out c l = 150pf (50% to 50%) 1.3 3.5 s 1. measured from 3 v to -3 v or from -3 v to 3 v. 2. one transmitter output is loaded with r l = 3 k to 7 k , c l = 50 to 1000 pf.
electrical characteristics st232ab - st232ac 6/16 table 6. receiver electrical characteristics (c 1 - c 4 = 0.1 f, v cc = 5 v 10 %, t a = -40 to 85 c, unless otherwise specified. typical values are referred to t a = 25 c). symbol parameter test condition min. typ. max. unit v rin receiver input voltage operating range -30 30 v r rin rs-232 input resistance t a = 25c 3 5 7 k v ril rs-232 input threshold low 0.8 1.3 v v rih rs-232 input threshold high 1.8 2.4 v v rihys rs-232 input hysteresis v cc = 5v 0.2 0.5 1 v v rol ttl/cmos output voltage low i out = 3.2ma (to v cc )0.20.4v v roh ttl/cmos output voltage high i out = -1ma (to gnd) 3.5 v cc -0.2 v i scr receiver output short circuit current to gnd 2 10 ma to v cc 10 30 t dr propagation delay time c l = 150pf (1) 0.1 0.5 s 1. rs-232 in to ttl-cmos out (from 50% to 50%)
st232ab - st232ac typical application 7/16 4 typical application figure 2. application circuit (1) (2) 1. c 1-4 capacitors can even be 1f ones 2. c 1-4 can be common or biased capacitors table 7. capacitance value (f) c1 c2 c3 c4 c5 0.1 0.1 0.1 0.1 0.1
typical performance characteristics st232ab - st232ac 8/16 5 typical performance characteristics (unless otherwise specified t j = 25 c) figure 3. driver voltage transfer characteristics figure 4. drive short circuit output current vs temperature figure 5. receiver threshold vs supply voltage figure 6. driver output capability current vs output voltage
st232ab - st232ac typical performance characteristics 9/16 figure 7. driver short circuit supply current vs temperature figure 8. receiver threshold vs temperature
package mechanical data st232ab - st232ac 10/16 6 package mechanical data in order to meet environmental requirements, st offers these devices in ecopack ? packages. these packages have a lead-free second level interconnect. the category of second level interconnect is marked on the package and on the inner box label, in compliance with jedec standard jesd97. th e maximum ratings related to soldering conditions are also marked on the inner box label. ecopack is an st trademark. ecopack specifications are available at: www.st.com.
st232ab - st232ac package mechanical data 11/16 dim. mm. inch. min. typ. max. min. typ. max. a 1.75 0.06 8 a 1 0.1 0.25 0.004 0.010 a 2 1.64 0.06 3 b 0. 3 5 0.46 0.01 3 0.01 8 b 1 0.1 9 0.25 0.007 0.010 c 0.5 0.01 9 c1 45 (typ.) d 9 . 8 10 0. 38 50. 393 e5. 8 6.2 0.22 8 0.244 e 1.27 0.050 e 38 . 89 0. 3 50 f 3 . 8 4.0 0.14 9 0.157 g 4.6 5. 3 0.1 8 1 0.20 8 l 0.5 1.27 0.01 9 0.050 m 0.62 0.024 s8 (m a x.) s o-16 mechanical data 0016020d
package mechanical data st232ab - st232ac 12/16 dim. mm. inch. min. typ. max. min. typ. max. a 1.2 0.047 a1 0.05 0.15 0.002 0.004 0.006 a2 0. 8 1 1.05 0.0 3 1 0.0 39 0.041 b 0.1 9 0. 3 0 0.007 0.012 c0.0 9 0.20 0.004 0.007 9 d4. 9 5 5.1 0.1 93 0.1 9 7 0.201 e 6.2 6.4 6.6 0.244 0.252 0.260 e1 4. 3 4.4 4.4 8 0.16 9 0.17 3 0.176 e 0.65 b s c 0.0256 b s c k0 8 0 8 l 0.45 0.60 0.75 0.01 8 0.024 0.0 3 0 t ss op16 mechanical data c e b a2 a e1 d 1 pin 1 identification a1 l k e 00 8 0 338 d
st232ab - st232ac package mechanical data 13/16 dim. mm. inch. min. typ. max. min. typ. max. a 33 0 12. 99 2 c 12. 8 1 3 .2 0.504 0.51 9 d 20.2 0.7 9 5 n60 2. 3 62 t 22.4 0. 88 2 ao 6.45 6.65 0.254 0.262 bo 10. 3 10.5 0.406 0.414 ko 2.1 2. 3 0.0 8 2 0.0 9 0 po 3 . 9 4.1 0.15 3 0.161 p7. 98 .1 0. 3 11 0. 3 1 9 tape & reel s o-16 mechanical data
package mechanical data st232ab - st232ac 14/16 dim. mm. inch. min. typ. max. min. typ. max. a 33 0 12. 99 2 c 12. 8 1 3 .2 0.504 0.51 9 d 20.2 0.7 9 5 n60 2. 3 62 t 22.4 0. 88 2 ao 6.7 6. 9 0.264 0.272 bo 5. 3 5.5 0.20 9 0.217 ko 1.6 1. 8 0.06 3 0.071 po 3 . 9 4.1 0.15 3 0.161 p7. 98 .1 0. 3 11 0. 3 1 9 tape & reel t ss op16 mechanical data
st232ab - st232ac revision history 15/16 7 revision history table 8. document revision history date revision changes 27-oct-2006 7 order codes updated. 14-nov-2007 8 added ta b l e 1 . 08-feb-2008 9 modified: table 1 on page 1 .
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