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november 2007 rev 8 1/22 22 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 mous e drive ability 0.1 f external capacitors meet eia/tia-232 specifications down to 3 v available in ssop-28 and tssop28 description the st3243 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 capability. the receiver r2 is always active to implement a wake-up feature for serial port. the st3243 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 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. ssop tssop table 1. device summary order code temperature range package packaging st3243cpr 0 to 70 c ssop-28 (tape and reel) 1350 parts per reel ST3243BTR -40 to 85 c tssop28 (tape and reel) 2500 parts per reel www.st.com
contents st3243b - st3243c 2/22 contents 1 pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 4 application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 5 typical performance characteristi cs . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 6 package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 7 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
st3243b - st3243c pin configuration 3/22 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- -5.5v 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 15 r5 out fifth receiver output voltage 16 r4 out fourth receiver output voltage
pin configuration st3243b - st3243c 4/22 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. indica tes 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+ 5.5v generated by the charge pump 28 c 1 + positive terminal of volt age-charge pump capacitor table 2. pin description (continued) pin n symbol name and function table 3. truth table force off t out r out r 2outb 0 high z high z active (1) 1 active (1) active (1) active (1) 1. if the part is in auto-power-down mode (force off = v cc , force on = gnd) it is shutdown, if no valid rs-232 levels are present on all receiver input
st3243b - st3243c maximum ratings 5/22 2 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
electrical characteristics st3243b - st3243c 6/22 3 electrical characteristics table 5. 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 symbol parameter test cond itions min. typ. max. unit i ashdn supply current auto-power-down v cc = 3.3 or 5.0v, t a = 25c all r_in open, forceoff = v cc 110a i shdn shutdown supply current v cc = 3.3 or 5.0v, t a = 25c all r_in open, forceoff = gnd 110a i shdn supply current auto-power-down disabled v cc = 3.3 or 5.0v t a = 25c forceon = forceoff = v cc no load 0.3 1 ma table 6. logic input electrical characteristics (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 symbol parameter test conditions min. typ. max. unit v til input logic threshold lo w t-in, forceon, forceoff 0.8 v v tih input logic threshold high t-in, forceon, forceoff v cc = 3.3v v cc = 5v 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 = 1.6ma 0.4 v v oh output voltage high i out = -1ma v cc -0.6 v cc -0.1 v table 7. auto-power-down 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 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 t wu receiver threshold to transmitter enabled i out = 1.6ma 250 ms
st3243b - st3243c electrical characteristics 7/22 t invh receiver positive or negative threshold to invalid high i out = -1ma 1 ms t invl receiver positive or negative threshold to invalid low 30 ms table 7. auto-power-down 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 symbol parameter test conditions min. typ. max. unit table 8. transmitter electrical characteristics (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 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- = 0v, v out = 2v 300 10m i sc output short circuit current 35 60 ma v ot transmitter output voltage t1in = t2in = gnd, t3in = v cc t3out loaded with 3k to gnd t1out and t2out loaded with 2.5ma each 5v table 9. receiver 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 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 = 3.3v t a = 25c, v cc = 5.0v 0.6 0.8 1.2 1.2 v v rih rs-232 input threshold high t a = 25c, v cc = 3.3v t a = 25c, v cc = 5.0v 1.5 1.8 2.4 2.4 v v rihys input hysteresis 0.5 v r rin input resistance t a = 25c 3 5 7 k
electrical characteristics st3243b - st3243c 8/22 table 10. timing 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 symbol parameter test conditions min. typ. max. unit d r maximum data rate r l = 3k , c l = 1000pf one transmitter switching 250 400 kbps t phl t plh receiver propagation delay r in to r out , c l = 150pf 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 1ms t invl receiver positive or negative threshold to invalid low 30 ms s rt transition slew rate t a = 25c r l = 3k to 7k v cc = 3.3v measured from +3v to -3v or -3v to +3v c l = 150pf to 1000pf c l = 150pf to 2500pf 6 4 30 30 v/s v/s
st3243b - st3243c application 9/22 4 application figure 2. application circuits 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
application st3243b - st3243c 10/22 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 table 11. capacitance value ( f) v cc c1 c2 c3 c4 cbypass
st3243b - st3243c typical performance characteristics 11/22 5 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 figur e 6. receiver output enable & disable time
typical performance characteristics st3243b - st3243c 12/22 figure 7. output current vs output high voltage figure 8. output current vs output low voltage
st3243b - st3243c package mechanical data 13/22 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. the 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
package mechanical data st3243b - st3243c 14/22
st3243b - st3243c package mechanical data 15/22 dim. mm. inch. min. typ. max. min. typ. max. a 2 0.07 9 a1 0.050 0.002 a2 1.65 1.75 1. 8 5 0.065 0.06 9 0.07 3 b 0.22 0. 38 0.00 9 0.015 c0.0 9 0.25 0.004 0.010 d 9 . 9 10.2 10.5 0. 39 0 0.402 0.41 3 e 7.4 7. 88 .2 0.2 9 10. 3 07 0. 3 2 3 e1 5 5. 3 5.6 0.1 9 7 0.20 9 0.220 e 0.65 b s c 0.0256 b s c k 0 10 0 10 l 0.55 0.75 0. 9 5 0.022 0.0 3 0 0.0 3 7 ss op2 8 mechanical data
package mechanical data st3243b - st3243c 16/22
st3243b - st3243c package mechanical data 17/22 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 st3243b - st3243c 18/22 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 8 .4 8 .6 0. 33 10. 339 bo 10.7 10. 9 0.421 0.42 9 ko 2. 93 .1 0.114 0.122 po 3 . 9 4.1 0.15 3 0.161 p 11. 9 12.1 0.46 8 0.476 tape & reel ss op2 8 mechanical data
st3243b - st3243c package mechanical data 19/22
package mechanical data st3243b - st3243c 20/22 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
st3243b - st3243c revision history 21/22 7 revision history table 12. 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 .
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