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october 2009 doc id 8648 rev 12 1/16 16 st3243eb st3243ec 15 kv esd protected 3 to 5.5 v, 400 kbps, rs-232 transceiver with auto power-down features esd protection for rs-232 i/o pins: ? 8 kv iec 1000-4-2 contact discharge ? 15 kv human body model 1 a supply current achieved when in auto power-down 250 kbps minimum guaranteed data rate guaranteed 6 v/ms slew rate range guaranteed mous e drive ability 0.1 f external capacitors meet eia/tia-232 specifications down to 3 v available in tssop28 package description the st3243e device consists of 3 drivers, 5 receivers and a dual charge-pump circuit. the device meets the requirements of eia/tia and v.28/v.24 communication standards providing high data rate capa bility and enhanced electrostatic discharge (esd) protection. all transmitter outputs and receiver input are protected to 8 kv using iec 1000-4-2 contact discharge and 15 kv using the human body model. the receiver r2 is always active to implement a wake-up feature for serial port. the st3243e has a proprietary low-dropout transmitter output stage enabling true rs-232 performance from a 3.0 v to 5.5 v supply with a dual charge pump. the device is guaranteed to run at data rates of 250 kbps while maintaining rs-232 output levels. the auto power-down feature functions when forceon is low and forceoff is high. during this mode of operation, if the device does not sense a valid rs-232 signal, the driver outputs are disabled. if forceoff is set low, both drivers and receivers (expert r2b) are shut off, and supply current is reduced to 1 a. disconnecting the serial port or turning off the peripheral drives causes the auto power-down condition to occur. auto power-down can be disabled when forceon and forceoff are high, and should be done when driving a serial mouse. with auto power-down enabled, the device is activated automatically when a valid signal is applied to any receiver input. typical application are in notebook, subnotebook, palmtop computers, battery-powered equipment, handheld equipment, peripherals and printers. tssop table 1. device summary order codes temperature range package packaging st3243ectr-e 0 to 70 c tssop28 (tape and reel) 2500 parts per reel ST3243EBTR - 40 to 85 c tssop28 (tape and reel) 2500 parts per reel www.st.com
contents st3243eb, st3243ec 2/16 doc id 8648 rev 12 contents 1 pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 truth tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3 maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 4 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 5 application circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 6 timing diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 7 package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 8 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
st3243eb, st3243ec pin configuration doc id 8648 rev 12 3/16 1 pin configuration figure 1. pin configuration table 2. pin description pin n symbol name and function 1c 2 + positive terminal of inverting charge pump capacitor 2c 2 - negative terminal of inverting charge pump capacitor 3 v- -5.5 v generated by the charge pump 4r1 in first receiver input voltage 5r2 in second receiver input voltage 6r3 in third receiver input voltage 7r4 in fourth receiver input voltage 8r5 in fifth receiver input voltage 9t1 out first transmitter output voltage 10 t2 out second transmitter output voltage 11 t3 out third transmitter output voltage 12 t3 in third transmitter input voltage 13 t2 in second transmitter input voltage 14 t1 in first transmitter input voltage
pin configuration st3243eb, st3243ec 4/16 doc id 8648 rev 12 15 r5 out fifth receiver output voltage 16 r4 out fourth receiver output voltage 17 r3 out third receiver output voltage 18 r2 out second receiver output voltage 19 r1 out first receiver output voltage 20 r2 outb non-inverting complementary receiver output, always active for wake-up 21 invalid output of the valid signal detector. indicates if a valid rs-232 level is present on receiver inputs logic "1" 22 forceoff drive low to shut down transmitters and on-board power supply. this over-rides all automatic circuitry and forceon 23 forceon drive high to override automatic circuitry keeping transmitters on (forceoff must be high) 24 c 1 - negative terminal of voltage-charge pump capacitor 25 gnd ground 26 v cc supply voltage 27 v+ 5.5 v generated by the charge pump 28 c 1 + positive terminal of voltage-charge pump capacitor table 2. pin description (continued) pin n symbol name and function
st3243eb, st3243ec truth tables doc id 8648 rev 12 5/16 2 truth tables table 3. invalid truth table rs-232 signal present at any receiver input invalid output yes h no l table 4. output control truth table force on force off valid receiver level operation status t out r out r 2outb x 0 x shutdown (force off) high z high z active 11 x normal operating (force on) active active active 0 1 yes normal operating (auto power-down) active active active 01 no shutdown (auto power-down) high z active active
maximum ratings st3243eb, st3243ec 6/16 doc id 8648 rev 12 3 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 5. absolute maximum ratings symbol parameter value unit v cc supply voltage -0.3 to 6 v v+ doubled voltage terminal (v cc -0.3) to 7 v v- inverted voltage terminal 0.3 to -7 v v+ +|v-| 13 v forceon, forceoff, t in input voltage -0.3 to 6 v r in receiver input voltage range 25 v t out transmitter output voltage range 13.2 v r out r outb invalid receiver output voltage range -0.3 to (v cc + 0.3) v t short short circuit duration on t out (one at a time) continuous t stg storage temperature range -65 to 150 c table 6. esd performance: transmitter outputs, receiver inputs symbol parameter test conditions min. typ. max. unit esd esd protection voltage human body model 15 kv esd esd protection voltage iec 1000-4-2 (contact discharge) 8kv
st3243eb, st3243ec electrical characteristics doc id 8648 rev 12 7/16 4 electrical characteristics c1 - c4 = 0.1 f, v cc = 3 v to 5.5 v, t a = -40 to 85 c, unless otherwise specified. typical values are referred to t a = 25 c. c1 - c4 = 0.1 f, v cc = 3 v to 5.5 v, t a = -40 to 85 c, unless otherwise specified. typical values are referred to t a = 25 c. table 7. electrical characteristics symbol parameter test conditions min. typ. max. unit i ashdn supply current auto power-down forceoff = gnd,forceon = v cc all r_in open or grounded 110a i supply supply current forceon = forceoff = v cc 0.3 1 ma i shdn shutdown supply current forceoff = gnd 1 10 a table 8. logic input electrical characteristics symbol parameter test conditions min. typ. max. unit v til input logic threshold low t-in, forceon, forceoff 0.8 v v tih input logic threshold high t-in, forceon, forceoff v cc = 3.3 v v cc = 5 v 2 2.4 v v v thys transmitter input hysteresis 0.5 v i il input leakage current t-in, forceon, forceoff 0.01 1.0 a i ol output leakage current receiver disabled 0.05 10 a v ol output voltage low i out = 1.6 ma 0.4 v v oh output voltage high i out = -1 ma v cc -0.6 v cc -0.1 v
electrical characteristics st3243eb, st3243ec 8/16 doc id 8648 rev 12 c1 - c4 = 0.1 f, v cc = 3 v to 5.5 v, t a = -40 to 85 c, unless otherwise specified. typical values are referred to t a = 25 c, forceon = gnd, forceoff = v cc . c1 - c4 = 0.1 f, v cc = 3 v to 5.5 v, t a = -40 to 85 c, unless otherwise specified. typical values are referred to t a = 25 c. table 9. auto power-down electrical characteristics symbol parameter test conditions min. typ. max. unit v rite receiver input threshold to invalid output voltage high (see figure 3 ) positive threshold 2.7 v negative threshold 2.7 v v ritd receiver input threshold to invalid output voltage low (see figure 3 ) -0.3 0.3 v v iol invalid output voltage low i out = 1.6 ma 0.4 v v ioh invalid output voltage high i out = -1 ma v cc -0.6 v t wu receiver or transmitter edge transmitter enabled (see figure 3 ) 100 s t invh receiver positive or negative threshold to invalid high (see figure 3 ) 0.2 s t invl receiver positive or negative threshold to invalid low (see figure 3 ) 30 s table 10. transmitter electrical characteristics symbol parameter test conditions min. typ. max. unit v tout output voltage swing all transmitter outputs are loaded with 3k to gnd 5 5.4 v r out output resistance v cc = v+ = v- = 0 v, v out = 2 v 300 10m i sc output short circuit current v cc = 3.3 v 40 60 ma i l output leakage current v cc = 0 to 5.5v, transmitter output = 12 v, transmitter disabled 25 a v ot transmitter output voltage t1in = t2in = gnd,t3in = v cc t3out loaded with 3 k to gnd t1out and t2out loaded with 2.5ma each 5v
st3243eb, st3243ec electrical characteristics doc id 8648 rev 12 9/16 c1 - c4 = 0.1 f, v cc = 3 v to 5.5 v, t a = -40 to 85 c, unless otherwise specified. typical values are referred to t a = 25 c. c1 - c4 = 0.1 f, v cc = 3 v to 5.5 v, t a = -40 to 85 c, unless otherwise specified. typical values are referred to t a = 25 c. table 11. receiver electrical characteristics symbol parameter test conditions min. typ. max. unit v rin receiver input voltage operating range -25 25 v v ril rs-232 input threshold low t a = 25c, v cc = 3.3 v t a = 25c, v cc = 5.0 v 0.6 0.8 1.1 1.4 v v rih rs-232 input threshold high t a = 25c, v cc = 3.3 v t a = 25c, v cc = 5.0 v 1.6 1.9 2.4 2.4 v v rihys input hysteresis 0.5 v r rin input resistance t a = 25c 3 5 7 k table 12. timing characteristics symbol parameter test conditions min. typ. max. unit d r maximum data rate r l = 3k , c l = 1000 pf one transmitter switching 250 400 kbps t phl t plh receiver propagation delay r in to r out , c l = 150 pf 0.15 s t t_skew transmitter skew 150 ns t r_skew receiver skew 70 ns s rt transition slew rate t a = 25c r l = 3k to 7k , v cc = 3.3 v measured from +3 v to -3 v or -3 v to +3 v c l = 150 pf to 1000 pf c l = 150 pf to 2500 pf 6 4 30 30 v/s v/s
application circuits st3243eb, st3243ec 10/16 doc id 8648 rev 12 5 application circuits figure 2. application circuits table 13. required minimum capacitance value (f) v cc (v) c 1 c 2, c 3, c 4, c bypass 3 to 3.6 0.1 0.1 4.5 to 5.5 0.047 0.33
st3243eb, st3243ec timing diagrams doc id 8648 rev 12 11/16 6 timing diagrams figure 3. auto power-down input levels figure 4. auto power-down input timing
package mechanical data st3243eb, st3243ec 12/16 doc id 8648 rev 12 7 package mechanical data in order to meet environmental requirements, st offers these devices in different grades of ecopack ? packages, depending on their level of environmental compliance. ecopack ? specifications, grade definitions and product status are available at: www.st.com . ecopack ? is an st trademark.
st3243eb, st3243ec package mechanical data doc id 8648 rev 12 13/16 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 d 9 .6 9 .7 9 . 8 0. 3 7 8 0. 38 20. 38 6 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 op2 8 mechanical data 012 8 2 9 2b
package mechanical data st3243eb, st3243ec 14/16 doc id 8648 rev 12 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. 8 7 0.26 8 0.276 bo 10.1 10. 3 0. 398 0.406 ko 1.7 1. 9 0.067 0.075 po 3 . 9 4.1 0.15 3 0.161 p 11. 9 12.1 0.46 8 0.476 tape & reel t ss op2 8 mechanical data
st3243eb, st3243ec revision history doc id 8648 rev 12 15/16 8 revision history table 14. document revision history date revision changes 21-jun-2004 6 page 6 - i l (output leakage current) ma ==> a 31-mar-2006 7 order codes updated and new template. 25-oct-2006 8 order codes updated. 24-aug-2007 9 order codes updated. 09-jul-2008 10 removed: so-28 and ssop28 packages. 28-jul-2009 11 removed: flip-chip28 package, modified table 1 on page 1 . 16-oct-2009 12 modified table 9 on page 8 .
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