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october 2011 doc id 7539 rev 10 1/17 1 st3243b st3243c 3 to 5.5 v, 400 kbps, rs-232 transceiver with auto-power-down features 1 a supply current achieved when in auto- power-down 250 kbps minimum guaranteed data rate guaranteed 6 v/s slew rate range guaranteed mouse drive ability 0.1 f external capacitors meet eia/tia-232 specifications down to 3 v available in ssop-28 table 1. device summary order code temperature range package packaging st3243bpr -40 to 85 c ssop-28 (tape and reel) 1350 parts per reel st3243cpr 0 to 70 c ssop-28 (tape and reel) 1350 parts per reel ssop-28 www.st.com
contents st3243b st3243c 2/17 doc id 7539 rev 10 contents 1 description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 4 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 5 application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 6 typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 7 package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 8 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
st3243b st3243c description doc id 7539 rev 10 3/17 1 description the st3243b / st3243c devices consist of 3 drivers, 5 receivers and a dual charge-pump circuit. the devices meet the requirements of eia/tia and v.28/v.24 communication standards providing high data rate capability. the receiver r2 is always active to implement a wake-up feature for serial port. the st3243b / st3243c have 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 devices are 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 ma. 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, sub-notebook, palmtop computers, battery-powered equipment, hand-held equipment, peripherals and printers.
pin configuration st3243b st3243c 4/17 doc id 7539 rev 10 2 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
st3243b st3243c pin configuration doc id 7539 rev 10 5/17 14 t1 in first transmitter input voltage 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 overrides 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 table 3. truth table force o ff t out r out r 2outb 0 high z high z active (1) 1active (1) active (1) active (1) 1. if the part is in auto-power-down mode (force o ff = v cc , forceon = gnd) it is shutdown, if no valid rs-232 levels are present on all receiver input.
maximum ratings st3243b st3243c 6/17 doc id 7539 rev 10 3 maximum ratings note: 1 absolute maximum ratings are those values beyond which damage to the device may occur. functional operation under these condition is not implied. v+ and v- can have a maximum magnitude of +7 v, but their absolute addition can not exceed 13 v. 2 the device doesn?t meet 1 kv esd hbm. table 4. 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
st3243b st3243c electrical characteristics doc id 7539 rev 10 7/17 4 electrical characteristics c 1 - c 4 = 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. c 1 - c 4 = 0.1 a, 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. c 1 - c 4 = 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 5. electrical characteristics symbol parameter test conditions min. typ. max. unit i ashdn supply current auto-power-down v cc = 3.3 or 5.0 v, t a = 25 c all r_in open, forceoff = v cc 110a i shdn shutdown supply current v cc = 3.3 or 5.0 v, t a = 25 c all r_in open, forceoff = gnd 110a i supply supply current auto-power-down disabled v cc = 3.3 or 5.0 v t a = 25 c forceon = forceoff = v cc no load 0.3 1 ma table 6. 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 table 7. auto-power-down electrical characteristics symbol parameter test conditions min. typ. max. unit v rite receiver input threshold to transmitter enabled positive threshold negative threshold 2.7 2.7 v v v ritd receiver input threshold to transmitter disabled 1 a supply current -0.3 0.3 v v iol invalid output voltage low 0.4 v v ioh invalid output voltage high v cc -0.6 v
electrical characteristics st3243b st3243c 8/17 doc id 7539 rev 10 c 1 - c 4 = 0.1 f, v cc = 3 v to 5.5 v, t a = -40 to 85c, unless otherwise specified. typical values are referred to t a = 25 c. c 1 - c 4 = 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. t wu receiver threshold to transmitter enabled i out = 1.6 ma 250 s t invh receiver positive or negative threshold to invalid high i out = -1 ma 1 s t invl receiver positive or negative threshold to invalid low 30 s table 7. auto-power-down electrical characteristics (continued) symbol parameter test conditions min. typ. max. unit table 8. transmitter electrical characteristics symbol parameter test conditions min. typ. max. unit v tout output voltage swing all transmitter outputs are loaded with 3 k to gnd 5 5.4 v r out output resistance v cc = v+ = v- = 0 v, v out = 2 v 300 10 m i sc output short-circuit current 35 60 ma v ot transmitter output voltage t1in = t2in = gnd, t3in = v cc t3out loaded with 3 k to gnd t1out and t2out loaded with 2.5 ma each 5v table 9. 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 = 25 c, v cc = 3.3 v t a = 25 c, v cc = 5.0 v 0.6 0.8 1.2 1.2 v v rih rs-232 input threshold high t a = 25 c, v cc = 3.3 v t a = 25 c, v cc = 5.0 v 1.5 1.8 2.4 2.4 v v rihys input hysteresis 0.5 v r rin input resistance t a = 25 c 3 5 7 k
st3243b st3243c electrical characteristics doc id 7539 rev 10 9/17 c 1 - c 4 = 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 10. timing characteristics symbol parameter test conditions min. typ. max. unit d r maximum data rate r l = 3 k , 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 100 ns t r_skew receiver skew 50 ns t invh receiver positive or negative threshold to invalid high 1s t invl receiver positive or negative threshold to invalid low 30 s s rt transition slew rate t a = 25 c, r l = 3 k to 7 k , 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 st3243b st3243c 10/17 doc id 7539 rev 10 5 application figure 2. application circuits !-
st3243b st3243c application doc id 7539 rev 10 11/17 table 11. capacitance value (f) v cc c1 c2 c3 c4 cbypass 3.0 to 3.6 0.1 0.1 0.1 0.1 0.1 4.5 to 5.5 0.047 0.33 0.33 0.33 0.33 3.0 to 5.5 0.22 1.0 1.0 1.0 0.22
typical performance characteristics st3243b st3243c 12/17 doc id 7539 rev 10 6 typical performance characteristics unless otherwise specified t j = 25 c. figure 3. invalid high threshold time figure 4. invalid low threshold time figure 5. receiver propagation delay figure 6. receiver output enable and disable time
st3243b st3243c typical performance characteristics doc id 7539 rev 10 13/17 figure 7. output current vs. output high voltage figure 8. output current vs. output low voltage
package mechanical data st3243b st3243c 14/17 doc id 7539 rev 10 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. figure 9. ssop-28 outline table 12. ssop-28 mechanical data symbol dimensions mm inch min. typ. max. min. typ. max. a 2 0.079 a1 0.050 0.002 a2 1.65 1.75 1.85 0.065 0.069 0.073 b 0.22 0.38 0.009 0.015 c 0.09 0.25 0.004 0.010 d 9.9 10.2 10.5 0.390 0.402 0.413 e 7.4 7. 8 8.2 0.291 0.307 0.323 e1 5 5.3 5.6 0.197 0.209 0.220 e 0.65 bsc 0.0256 bsc k 0 10 0 10 l 0.55 0.75 0.95 0.022 0.030 0.037 !-
st3243b st3243c package mechanical data doc id 7539 rev 10 15/17 figure 10. tape and reel ssop-28 outline (1) 1. drawing not in scale. table 13. tape and reel ssop-28 mechanical data symbol dimensions mm inch min. typ. max. min. typ. max. a 330 12.992 c 12.8 13.2 0.504 0.519 d 20.2 0.795 n 60 2.362 t 22.4 0.882 ao 8.4 8.6 0.331 0.339 bo 10.7 10.9 0.421 0.429 ko 2.9 3.1 0.114 0.122 po 3.9 4.1 0.153 0.161 p 11.9 12.1 0.468 0.476 !-
revision history st3243b st3243c 16/17 doc id 7539 rev 10 8 revision history table 14. document revision history date revision changes 19-sep-2004 6 document updating. 31-mar-2006 7 order codes updated. 12-nov-2007 8 added ta b l e 1 . 21-oct-2009 9 modified table 1 on page 1 . 07-oct-2011 10 added st3243b device, document reformatted, updated/added figure 9 and figure 10 , table 12 and ta b l e 1 3 , minor text and typo modifications throughout the document.
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