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september 2010 doc id 9066 rev 5 1/13 1 st3241eb st3241ec 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 meets eia/tia-232 specifications down to 3 v available in ssop-28 package description the st3241e 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 inputs 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 st3241e 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. it is a complete serial port (3 drivers, 5 receivers) intended for notebook or sub-notebook computers. receivers r1 and r2 have extra outputs in addition to their standard outputs. these extra outputs are always active. typical applications are in notebooks, sub- notebooks, palmtop computers, battery-powered equipment, hand-held equipment, peripherals and printers. ssop-28 table 1. device summary order code temperature range package packaging st3241ecpr 0 to 70c ssop-28 (tape and reel) 1350 parts per reel st3241ebpr ?40 to 85c ssop-28 (tape and reel) 1350 parts per reel www.st.com
contents st3241eb - st3241ec 2/13 doc id 9066 rev 5 contents 1 pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 4 application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 5 package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 6 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
st3241eb - st3241ec pin configuration doc id 9066 rev 5 3/13 1 pin configuration figure 1. pin configuration table 2. pin description pin number 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 15 r5 out fifth receiver output voltage 16 r4 out fourth receiver output voltage c s 10 8 00
pin configuration st3241eb - st3241ec 4/13 doc id 9066 rev 5 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 r1 outb non-inverting complementary receiver output, always active for wake-up 22 shdn shutdown control. active low. 23 en receiver enable. active low 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 3. shutdown and enable control truth table shdn en t out r out r outb 0 0 high z active active 0 1 high z high z active 1 0 active active active 1 1 active high z active table 2. pin description (continued) pin number symbol name and function
st3241eb - st3241ec maximum ratings doc id 9066 rev 5 5/13 2 maximum ratings note: absolute maximum ratings are those values beyond which damage to the device may occur. functional operation under these conditions is not implied. note: 1 v+ and v- can have a maximum magnitude of +7 v, but their absolute addition cannot exceed 13 v. table 4. absolute maximum ratings symbol parameter value unit v cc supply voltage ?0.3 to 6 v v+ extra positive voltage ( note: 1 )(v cc ?0.3) to 7 v v- extra negative voltage ( note: 1 ) 0.3 to ?7 v v+ + |v-| ( note: 1 )13v shdn, en, 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 5. 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) 8- -kv
electrical characteristics st3241eb - st3241ec 6/13 doc id 9066 rev 5 3 electrical characteristics table 6. 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) symbol parameter test conditions min. typ. max. unit i supply supply current no load v cc = 3.3v or 5v, t a = 25c - 0.3 1 ma i shdn shutdown supply current shdn = gnd, t a = 25c - 1 10 a table 7. logic input and receiver output 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. symbol parameter test conditions min. typ. max. unit v til input logic threshold low t in , en , shdn 0.8 v v tih input logic threshold high v cc = 3.3v v cc = 5v 2 2.4 v v i il input leakage current t in , en , shdn 0.01 1.0 a table 8. receiver output 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. symbol parameter test conditions min. typ. max. unit i ol output leakage current r out , en , 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 9. transmitter 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. 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 = 2v 300 10m i sc output short circuit current 35 60 ma i l output leakage current v cc = 0 to 5.5v, transmitter output = 12 v, transmitter disabled 25 a v to 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
st3241eb - st3241ec electrical characteristics doc id 9066 rev 5 7/13 table 10. 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. 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 1.5 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 0.3 v r rin input resistance t a = 25 c 3 5 7 k table 11. 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. 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 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 300 ns 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 st3241eb - st3241ec 8/13 doc id 9066 rev 5 4 application figure 2. application circuits table 12. required minimum 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 0.1 3.0 to 5.5 0.1 0.47 0.47 0.47 0.1 c s 10 8 10
st3241eb - st3241ec package mechanical data doc id 9066 rev 5 9/13 5 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.
package mechanical data st3241eb - st3241ec 10/13 doc id 9066 rev 5 dim. . h c n i . m m min. typ. max. min. typ. max. 7 0 . 0 2 a 9 2 0 0 . 0 0 5 0 . 0 1 a a2 1.65 1.75 1. 8 5 0.065 0.069 0.07 3 b . 0 2 2 . 0 38 0.009 0.015 c 0.09 0 1 0 . 0 4 0 0 . 0 5 2 . 0 d 9.9 10.2 10.5 0. 3 90 0.402 0.41 3 e 7.4 7. 88 .2 0.291 0. 3 07 0. 3 2 3 e1 5 5. 3 5.6 0.197 0.209 0.220 b 5 6 . 0 e s b 6 5 2 0 . 0 c s c 0 1 0 0 1 0 k l 0.55 0.75 0.95 0.022 0.0 3 00.0 3 7 ss op2 8 mechanical data
st3241eb - st3241ec package mechanical data doc id 9066 rev 5 11/13 dim. . h c n i . m m min. typ. max. min. typ. max. a 33 . 2 1 0992 c12. 8 1 3 1 5 . 0 4 0 5 . 0 2 .9 7 . 0 2 . 0 2 d95 . 2 0 6 n 3 62 . 0 4 . 2 2 t 88 2 ao 8 .4 8 .6 0. 33 . 0 1 33 9 . 0 1 7 . 0 1 o b92 4 . 0 1 2 4 . 09 ko 2. 3 9 2 2 1 . 0 4 1 1 . 0 1 . 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 note: dr a wing not to s c a le
revision history st3241eb - st3241ec 12/13 doc id 9066 rev 5 6 revision history table 13. document revision history date revision changes 21-jun-2004 2 the i l (output leakage current) ma ==> a in table 8. 03-apr-2006 3 order code updated. 13-nov-2007 4 added ta b l e 1 28-sep-2010 5 removed tssop28 package and all re ferences from datasheet; updated ecopack ? text in section 5 ; reformatted document; minor textual updates.
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