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march 2006 rev 7 1/24 24 st3243e 15kv esd protected 3 to 5.5v, 400kbps, rs-232 transceiver with auto-powerdown general features esd protection for rs-232 i/o pins: ? 8kv iec 1000-4-2 contact discharge ? 15kv human body model 1a supply current achieved when in auto- powerdown 250kbps minimum guaranteed data rate guaranteed 6v/ms slew rate range guaranteed mouse driveability 0.1f external capacitors meet eia/tia-232 specifications down to 3v available in so-28, ssop-28, tssop28 and flip-chip28 packages 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 capability and enhanced electrostatic discharge (esd) protection. all transmitter outputs and receiver input are protected to 8kv using iec 1000-4-2 contact discharge and 15kv 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 3.0v to 5.5v supply with a dual charge pump. the device is guaranteed to run at data rates of 250kbps while maintaining rs-232 output levels. the auto-powerdown 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-powerdown condition to occur. auto-powerdown can be disabled when forceon and forceoff are high, and should be done when driving a serial mouse. with auto- powerdown 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, hand-held equipment, peripherals and printers. sop ssop tssop flip-chip28 www.st.com
contents st3243e 2/24 contents 1 pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 truth tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 3 maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 4 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 5 application circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 6 timing diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 7 package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 8 order code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 9 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
st3243e pin configuration 3/24 1 pin configuration figure 1. pin configuration sop, ssop, tssop (top view) flip-chip 6x5 (bottom view, bumps side)
pin configuration st3243e 4/24 table 1. pin description (for sop, ssop and tssop) 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 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+ 5.5v generated by the charge pump 28 c 1 + positive terminal of voltage-charge pump capacitor
st3243e pin configuration 5/24 table 2. pin description (for flip-chip) pin n symbol name and function a1 r2 in second receiver input voltage a2 r3 in third receiver input voltage a3 r4 in fourth receiver input voltage a4 r5 in fifth receiver input voltage a5 t1 out first transmitter output voltage a6 t2 out second transmitter output voltage b1 v- -5.5v generated by the charge pump b2 r1 in first receiver input voltage b3 t3 out third transmitter output voltage b4 t3 in third transmitter input voltage b5 t1 in first transmitter input voltage b6 t2 in second transmitter input voltage c1 c 2 + positive terminal of inverting charge pump capacitor c2 c 2 - negative terminal of inverting charge pump capacitor c5 r4 out fourth receiver output voltage c6 r5 out fifth receiver output voltage d1 c 1 + positive terminal of voltage- charge pump capacitor d2 v+ 5.5v generated by the charge pump d3 v cc supply voltage d4 forceon drive high to override automatic circuitry keeping transmitters on (forceoff must be high) d5 r1 out first receiver output voltage d6 r3 out third receiver output voltage e1 gnd ground e2 c 1 - negative terminal of voltage- charge pump capacitor e3 forceoff drive low to shut down transmitters and on-board power supply. this over-rides all automatic circuitry and forceon e4 invalid output of the valid signal detector. indicates if a valid rs-232 level is present on receiver inputs logic "1" e5 r2 outb non-inverting complementary receiver output, always active for wake-up e6 r2 out second receiver output voltage
truth tables st3243e 6/24 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-powerdown) active active active 01 no shutdown (auto-powerdown) high z active active
st3243e maximum ratings 7/24 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
electrical characteristics st3243e 8/24 4 electrical characteristics table 7. electrical characteristics (c1 - c4 = 0.1f, v cc = 3v to 5.5v, t a = -40 to 85c, unless otherwise specified. typical values are referred to t a = 25c) symbol parameter test conditions min. typ. max. unit i ashdn supply current auto- powerdown forceoff = gnd,forceon = v cc all r_in open or grounded 110 a 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 (c1 - c4 = 0.1f, v cc = 3v to 5.5v, t a = -40 to 85c, unless otherwise specified. typical values are referred to t a = 25c) 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 = 3.3v 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
st3243e electrical characteristics 9/24 table 9. auto-powerdown electrical characteristics (c1 - c4 = 0.1f, v cc = 3v to 5.5v, t a = -40 to 85c, unless otherwise specified. typical values are referred to t a = 25c, forceon = gnd, forceoff = v cc ) symbol parameter test conditions min. typ. max. unit v rite receiver input threshold to invalid output voltage high ( figure 3. ) positive threshold 2.7 v negative threshold 2.7 v v ritd receiver input threshold to invalid output voltage low ( figure 3. ) -0.3 0.3 v v iol invalid output voltage low i out = 1.6ma 0.4 v v ioh invalid output voltage high i out = -1ma v cc -0.6 v t wu receiver or transmitter edge transmitter enabled ( figure 3. ) 100 ms t invh receiver positive or negative threshold to invalid high ( figure 3. ) 0.2 ms t invl receiver positive or negative threshold to invalid low ( figure 3. ) 30 ms table 10. transmitter electrical characteristics (c1 - c4 = 0.1f, v cc = 3v to 5.5v, t a = -40 to 85c, unless otherwise specified. typical values are referred to t a = 25c) 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 v cc = 3.3v 40 60 ma i l output leakage current v cc = 0 to 5.5v, transmitter output= 12v, transmitter disabled 25 a 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
electrical characteristics st3243e 10/24 table 11. receiver electrical characteristics (c1 - c4 = 0.1f, v cc = 3v to 5.5v, t a = -40 to 85c, unless otherwise specified. typical values are referred to t a = 25c) 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 1.1 1.4 v v rih rs-232 input threshold high t a = 25c, v cc = 3.3v t a = 25c, v cc = 5.0v 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 (c1 - c4 = 0.1f, v cc = 3v to 5.5v, t a = -40 to 85c, unless otherwise specified. typical values are referred to t a = 25c) symbol parameter test conditions min. typ. max. unit d r maximum data rate r l = 3k ? , c l = 1000pfone 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 150 ns t r_skew receiver skew 70 ns s rt transition slew rate t a = 25c r l = 3k to 7k ?, v cc = 3.3v 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
st3243e application circuits 11/24 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
timing diagrams st3243e 12/24 6 timing diagrams figure 3. autopowerdown input levels figure 4. autopowerdown input timing
st3243e package mechanical data 13/24 7 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 st3243e 14/24 dim. mm. inch min. typ max. min. typ. max. a 2.65 0.104 a1 0.1 0.3 0.004 0.012 b 0.35 0.49 0.014 0.019 b1 0.23 0.32 0.009 0.012 c 0.5 0.020 c1 45 (typ.) d 17.70 18.10 0.697 0.713 e 10.00 10.65 0.393 0.419 e 1.27 0.050 e3 16.51 0.650 f 7.40 7.60 0.291 0.300 l 0.50 1.27 0.020 0.050 s (max.) so-28 mechanical data 0016023 8
st3243e package mechanical data 15/24 dim. 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 k0 10 0 10 l 0.55 0.75 0.95 0.022 0.030 0.037 ssop28 mechanical data
package mechanical data st3243e 16/24 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 0.031 0.039 0.041 b 0.19 0.30 0.007 0.012 c 0.09 0.20 0.004 0.0079 d 9.6 9.7 9.8 0.378 0.382 0.386 e 6.2 6.4 6.6 0.244 0.252 0.260 e1 4.3 4.4 4.48 0.169 0.173 0.176 e 0.65 bsc 0.0256 bsc k0 8 0 8 l 0.45 0.60 0.75 0.018 0.024 0.030 tssop28 mechanical data 0128292b
st3243e package mechanical data 17/24 dim. mm. mils min. typ max. min. typ. max. a 0.83 0.95 32.7 37.4 a1 0.24 9.4 a2 0.65 25.6 b 0.25 0.30 0.35 9.8 11.8 13.8 d 3.97 4.17 156.3 164.2 d1 2.5 98.4 e 2.47 2.67 97.2 105.1 e1 2 78.7 e 0.45 0.55 17.7 21.7 f 0.23 0.34 9.1 13.4 f1 0.80 0.91 31.5 31.8 flip-chip28 mechanical data 7385199/c
package mechanical data st3243e 18/24 dim. 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 30.4 1.197 ao 10.8 11.0 0.425 0.433 bo 18.2 18.4 0.716 0.724 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 tape & reel so-28 mechanical data
st3243e package mechanical data 19/24 dim. 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 tape & reel ssop28 mechanical data
package mechanical data st3243e 20/24 dim. 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 6.8 7 0.268 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 0.153 0.161 p 11.9 12.1 0.468 0.476 tape & reel tssop28 mechanical data
st3243e package mechanical data 21/24 dim. 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 18.4 0.882 ao 2.6 2.8 0.102 0.110 bo 4.1 4.3 0.161 0.169 ko 1.1 1.3 0.043 0.051 po 3.9 4.1 0.153 0.161 p 3.9 4.1 0.153 0.161 tape & reel flip-chip28 mechanical data
order code st3243e 22/24 8 order code table 14. order code part number temperature range package comments st3243ecdr 0 to 70c so-28 (tape & reel) 1000 parts per reel st3243ebdr -40 to 85c so-28 (tape & reel) 1000 parts per reel st3243ecpr 0 to 70c ssop-28 (tape & reel) 1350 parts per reel st3243ebpr -40 to 85c ssop-28 (tape & reel) 1350 parts per reel st3243ectr 0 to 70c tssop28 (tape & reel) 2500 parts per reel st3243ebtr -40 to 85c tssop28 (tape & reel) 2500 parts per reel ST3243ECJ 0 to 70c flip-chip28 coming soon st3243ebj -40 to 85c flip-chip28 coming soon
st3243e revision history 23/24 9 revision history table 15. revision history date revision changes 21-jun-2004 6 page 6 - il (output leakage current) ma ==> a 31-mar-2006 7 order codes has been updated and new template.
st3243e 24/24 please read carefully: i nformation in this document is provided solely in connection with st products. stmicroelectronics nv and its subsidiaries (?st? ) reserve the r ight to make changes, corrections, modifications or improvements, to this document, and the products and services described her ein at any t ime, without notice. a ll st products are sold pursuant to st?s terms and conditions of sale. p urchasers are solely responsible for the choice, selection and use of the st products and services described herein, and st ass umes no l iability whatsoever relating to the choice, selection or use of the st products and services described herein. n o license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. if any part of this d ocument refers to any third party products or services it shall not be deemed a license grant by st for the use of such third p arty products o r services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoeve r of such t hird party products or services or any intellectual property contained therein. u nless otherwise set forth in st?s terms and conditions of sale st disclaims any express or implied w arranty with respect to the use and/or sale of st products including without limitation implied w arranties of merchantability, fitness for a particular purpose (and their equivalents under the laws o f any jurisdiction), or infringement of any patent, copyright or other intellectual property right. u nless expressly approved in writing by an authorize representative of st, st products are not designed, a uthorized or warranted for use in military, air craft, space, life saving, or life sustaining applications, n or in products or systems, where failure or malfunction may result in personal injury, death, or s evere property or environmental damage. r esale of st products with provisions different from the statements and/or technical features set forth in this document shall i mmediately void a ny warranty granted by st for the st product or service described herein and shall not create or extend in any manner whatsoeve r, any l iability of st. st and the st logo are trademarks or registered trademarks of st in various countries. information in this document supersedes and replaces all information previously supplied. the st logo is a registered trademark of stmicroelectronics. all other names are the property of their respective owners. ? 2006 stmicroelectronics - all rights reserved stmicroelectronics group of companies australia - belgium - brazil - canada - china - czech republic - finland - france - germany - hong kong - india - israel - ital y - japan - malaysia - malta - morocco - singapore - spain - sweden - switzerland - united kingdom - united states of america www.st.com

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