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january 2008 rev 6 1/13 13 st3222b st3222c 3 to 3.6 v, low power, up to 400 kbps rs-232 drivers and receivers features 300 a supply current 250 kbps minimum guarantee data rate 6 v/s minimum guarantee slew rate meet eia/tia-232 specification down to 3 v description the st3222 is a 3 v powered eia/tia-232 and v.28/v.24 communications interface with low power requirements and high data-rate capabilities. st3222 has a proprietary low dropout transmitter output stage providing true rs-232 performance from 3 to 3.6 v power supplies. the device requires only four small 0.1 mf standard external capacitors for operating from 3 v supply. the st3222 has two receivers and two drivers. the st3222 features a 1 ma shutdown mode that reduces power consumption and extends battery life in portable systems. its receivers can remain acti ve in shutdown mode, allowing external devices such as modems to be monitored using only 1 ma supply current. the device is guaranteed to run at data rates of 250kbps while maintainin g rs-232 output levels. typical applications are notebook, sub-notebook and palmtop computers, battery powered equipment, hand-held equipment, peripherals and printers. tssop table 1. device summary order codes temperature range package packaging ST3222CTR 0 to 70 c tssop20 (tape and reel) 2500 parts per reel st3222btr -40 to 85 c tssop20 (tape and reel) 2500 parts per reel www.st.com
contents st3222b - st3222c 2/13 contents 1 pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3.1 receiver electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 4 application circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 4.1 typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 5 package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 6 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
st3222b - st3222c pin configuration 3/13 1 pin configuration figure 1. pin connection table 2. pin description pin n symbol name and function 1en receiver enable control. drive low for normal operation. drive high to force the receivers outputs (r_out) into a high-impedance state. 2c 1 + positive terminal for the first charge pump capacitor 3 v+ 5.5v generated by the charge pump. 4c 1 - negative terminal for the first charge pump capacitor 5c 2 + positive terminal for the second charge pump capacitor 6c 2 - negative terminal for the second charge pump capacitor 7 v- -5.5v generated by the charge pump. 8t2 out second transmitter output voltage 9r2 in second receiver input voltage 10 r2 out second receiver output voltage 11 nc not connected 12 t2 in second transmitter input voltage 13 t1 in first transmitter input voltage 14 nc not connected 15 r1 out first receiver output voltage 16 r1 in first receiver input voltage 17 t1 out first transmitter output voltage 18 gnd ground 19 v cc supply voltage 20 shdn active low shutdown control input. drive low to shut-down transmitter and charge pump
maximum ratings st3222b - st3222c 4/13 2 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. externally applied v+ and v- can have a maximum magnitude of +7 v, but their absolute addition can not exceed 13 v. running on internal charge pump, intrinsic se lf limitation allows exceeding those values without any damage. startup voltage sequence (v cc , then v+, then v-) is critical, therefore it is not recommended to use this device using externally applied voltage to v+ and v-. table 3. 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 t in transmitter input voltage range -0.3 to 6 v r in receiver input voltage range 25 v t out transmitter output voltage range 13.2 v r out receiver output voltage range -0.3 to (v cc + 0.3) v t short transmitter output short to gnd time continuous
st3222b - st3222c electrical characteristics 5/13 3 electrical characteristics note: transmitter input hysteresis is typically 250 mv table 4. electrical characteristics (c 1 - c 4 = 0.1 f, v cc = 3 v to 3.6 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 v cc power supply current no load v cc = 3.3v t a = 25c shdn =v cc 0.3 1 ma i shdn shutdown supply current no load v cc = 3.3v t a = 25c shdn =v cc 110a table 5. logic input electrical characteristics (c 1 - c 4 = 0.1 f, v c = 3 v to 3.6 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 il input logic threshold low t-in, en , shdn ( note: )0.8v v ih input logic threshold high v cc = 3.3v 2 v v hys transmitter input hysteresis 0.5 v i il input leakage current t-in, en , shdn 0.01 1a table 6. transmitter electrical characteristics (c 1 - c 4 = 0.1 a v cc = 3 v to 3.6 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 tout output voltage swing all transmitter outputs are loaded with 3k to gnd 5 5.4 v r tout transmitter output resistance v cc = v+ = v- = 0v, v out = 2v 300 10m i tsc output short circuit current 60 ma i tol output leakage current v cc = 0v or 3v to 3.6v, v out = 12v transmitters disable 25 a
electrical characteristics st3222b - st3222c 6/13 3.1 receiver electrical characteristics table 7. receiver electrical characteristics (c 1 - c 4 = 0.1 f, v cc = 3 v to 3.6 v, t a = -40 to 85 c, unless otherwise specified. typica l values are referred to t a = 25 c) symbol parameter test cond itions min. typ. max. unit i ol output leakage current r-out, en = v cc , receiver disabled 0.05 10 a v rin receiver input voltage operating range -25 25 v v ril input threshold low t a = 25c, v cc = 3.3v 0.6 1.2 v v rih input threshold high t a = 25c, v cc = 3.3v 1.5 2.4 v v rihys input hysteresis 0.5 v r rin input resistance t a = 25c 3 5 7 k v rol ttl/cmos output voltage low i out = 1.6ma 0.4 v v roh ttl/cmos output voltage high i out = -1ma v cc -0.6 v cc - 0.1 v table 8. timing characteristics (c 1 - c 4 = 0.1 f, v cc = 3 v to 3.6 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 data transfer rate r l = 3 k c l2 = 1000pf one transmitter switching 240 400 kbps t phlr t plhr propagation delay input to output r xin to r xout , c l = 150pf 0.2 s |t phlt - t thl | transmitter propagation delay difference (1) 100 ns t oer receiver output enable time normal operation 200 ns t odr receiver output disable time normal operation 200 ns |t phlr - t thr | receiver propagation delay difference 50 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 1. transmitter skew is measured at the transmitter zero cross points
st3222b - st3222c application 7/13 4 application figure 2. application circuits table 9. capacitance value (f) c1 c2 c3 c4 cbypass 0.1 0.1 0.1 0.1 0.1
application st3222b - st3222c 8/13 4.1 typical performance characteristics (unless otherwise specified t j = 25 c) figure 3. driver voltage transfer characteristics for transmitter inputs figure 4. driver voltage transfer characteristics for receiver inputs figure 5. output current vs output low voltage figure 6. output current vs output high voltage
st3222b - st3222c package mechanical data 9/13 5 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 st3222b - st3222c 10/13 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 6.4 6.5 6.6 0.252 0.256 0.260 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 op20 mechanical data c e b a2 a e1 d 1 pin 1 identification a1 l k e 00 8 7225c
st3222b - st3222c package mechanical data 11/13 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 6. 9 7.1 0.272 0.2 8 0 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 op20 mechanical data
revision history st3222b - st3222c 12/13 6 revision history table 10. document revision history date revision changes 22-mar-2006 5 order codes updated. 21-jan-2008 6 modified: ta b l e 3 and added ta bl e 1 .
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