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general description the max3222e/max3232e/max3237e/max3241e are 3v-powered eia/tia-232 and v.28/v.24 communications interfaces with low power requirements, high data-rate capabilities, and enhanced electrostatic discharge (esd) protection. all transmitter outputs and receiver inputs are protected to ?5kv using iec 1000-4-2 air-gap discharge, ?kv using iec 1000-4-2 contact discharge, and ?5kv using the human body model. in addition, the max3237e? logic and receiver i/o pins are protected to the above esd standards. the transceivers have a proprietary low-dropout transmit- ter output stage, delivering true rs-232 performance from a +3.0v to +5.5v supply with a dual charge pump. the charge pump requires only four small 0.1? capacitors for operation from a +3.3v supply. each device is guaran- teed to run at data rates of 250kbps while maintaining rs- 232 output levels. the max3237e is guaranteed to run at data rates of 250kbps in the normal operating mode and 1mbps in the megabaud operating mode while main- taining rs-232-compliant output levels. the max3222e/max3232e have two receivers and two drivers. the max3222e features a 1? shutdown mode that reduces power consumption and extends battery life in portable systems. its receivers can remain active in shutdown mode, allowing external devices such as modems to be monitored using only 1? supply current. both the max3222e and max3232e are pin, package, and functionally compatible with the industry-standard max242 and max232, respectively. the max3241e is a complete serial port (three drivers/five receivers) designed for notebook and sub- notebook computers. the max3237e (five drivers/three receivers) is ideal for peripheral applications that require fast data transfer. both devices feature a shutdown mode in which all receivers can remain active while using a supply current of only 1? (max3241e) or 10na (max3237e). the max3237e/max3241e have additional receiver outputs that always remain active. the max3222e, max3232e, and max3241e are avail- able in space-saving so, ssop, and tssop packages. the max3237e is available in an ssop package. ________________________applications battery-powered equipment printers cell phones smart phones cell-phone data cables xdsl modems notebook, subnotebook, and palmtop computers features esd protection for rs-232 i/o pins (max3222e/max3232e/max3237e/max3241e) 15kv?uman body model 8kv?ec 1000-4-2, contact discharge 15kv?ec 1000-4-2, air-gap discharge esd protection for all logic and receiver i/o pins (max3237e) 15kv?uman body model 8kv?ec 1000-4-2, contact discharge 15kv?ec 1000-4-2, air-gap discharge guaranteed data rate 250kbps (max3222e/max3232e/max3241e and max3237e, normal operation) 1mbps (max3237e, megabaud operation) latchup free low-power shutdown with receivers active 1a (max3222e/max3241e) 10na (max3237e) flow-through pinout (max3237e) guaranteed mouse driveability (max3241e) meets eia/tia-232 specifications down to 3.0v max3222e/max3232e/max3237e/max3241e ? 15kv esd-protected, down to 10na, 3.0v to 5.5v, up to 1mbps, true rs-232 transceivers ________________________________________________________________ maxim integrated products 1 19-1298; rev 5; 3/02 part max3222e cup max3222ecap 0? to +70? 0? to +70? temp range pin-package 20 tssop 20 ssop _______________ordering information ordering information continued at end of data sheet. ___________________________ selector guide typical operating circuits appear at end of data sheet. pin configurations appear at end of data sheet. megabaud is a trademark of maxim integrated products, inc. ? covered by u.s. patent numbers 4,636,930; 4,679,134; 4,777,577; 4,797,899; 4,809,152; 4,897,774; 4,999,761; and other patents p ending. for pricing, delivery, and ordering information, please contact maxim/dallas direct! at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. part no. of drivers/ receivers low- power shutdown guaranteed data rate (kbps) max3222e 2/2 ? 250 max3232e 2/2 250 max3237e (normal) 5/3 ? 250 max3237e (megabaud) 5/3 ? 250 max3241e 3/5 ? 1m
max3222e/max3232e/max3237e/max3241e 15kv esd-protected, down to 10na, 3.0v to 5.5v, up to 1mbps, true rs-232 transceivers 2 _______________________________________________________________________________________ absolute maximum ratings electrical characteristics (v cc = +3.0v to +5.5v, c1 c4 = 0.1f, t a = t min to t max , unless otherwise noted. typical values are at t a = +25 c.) (note 2) stresses beyond those listed under ?bsolute maximum ratings?may cause permanent damage to the device. these are stress rating s only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specificatio ns is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. v cc to gnd ..............................................................-0.3v to +6v v+ to gnd (note 1) ..................................................-0.3v to +7v v- to gnd (note 1) ...................................................+0.3v to -7v v+ + |v-| (note 1) .................................................................+13v input voltages t_in, en , shdn , mbaud to gnd ........................-0.3v to +6v r_in to gnd .....................................................................25v output voltages t_out to gnd...............................................................13.2v r_out, r_outb (max3241e)................-0.3v to (v cc + 0.3v) short-circuit duration, t_out to gnd.......................continuous continuous power dissipation (t a = +70 c) 16-pin ssop (derate 7.14mw/ c above +70 c) ..........571mw 16-pin wide so (derate 9.52mw/ c above +70 c) .....762mw 18-pin wide so (derate 9.52mw/ c above +70 c) .....762mw 18-pin pdip (derate 11.11mw/ c above +70 c)..........889mw 20-pin tssop (derate 10.9mw/ c above +70 c) ........879mw 20-pin ssop (derate 8.00mw/ c above +70 c) ..........640mw 28-pin ssop (derate 9.52mw/ c above +70 c) ..........762mw 28-pin wide so (derate 12.50mw/ c above +70 c) .............1w 28-pin tssop (derate 12.8mw/ c above +70 c) ......1026mw 32-pin qfn (derate 23.2mw/ c above +70 c).............1860mw operating temperature ranges max32_ _ec_ _ ...................................................0 c to +70 c max32_ _ee_ _.................................................-40 c to +85 c storage temperature range .............................-65 c to +150 c lead temperature (soldering, 10s) .................................+300 c note 1: v+ and v- can have maximum magnitudes of 7v, but their absolute difference cannot exceed 13v. parameter conditions min typ max units dc characteristics (v cc = +3.3v or +5.0v, t a = +25 c) max3222e, max3232e, max3241e 0.3 1 supply current shdn = v cc , no load max3237e 0.5 2.0 ma shdn = gnd 1 10 a shutdown supply current shdn = r_in = gnd, t_in = gnd or v cc (max3237e) 10 300 na logic inputs input logic low t_in, en , shdn , mbaud 0.8 v v cc = 3.3v 2.0 input logic high t_in, en , shdn , mbaud v cc = 5.0v 2.4 v transmitter input hysteresis 0.5 v t_in, en , shdn max3222e, max3232e, max3241e 0.01 1 input leakage current t_in, shdn , mbaud max3237e (note 3) 9 18 a receiver outputs output leakage current r_out (max3222e/max3237e/max3241e), en = v cc , receivers disabled 0.05 10 a output voltage low i out = 1.6ma (max322e/max3232e/max3241e) i out = 1.0ma (max3237e) 0.4 v output voltage high i out = -1.0ma v cc - 0.6 v cc - 0.1 v receiver inputs input voltage range -25 +25 v
max3222e/max3232e/max3237e/max3241e 15kv esd-pr otected, down to 10na, 3.0v to 5.5v , up to 1mbps, t r ue rs-232 transceivers _______________________________________________________________________________________ 3 electrical characteristics (continued) (v cc = +3.0v to +5.5v, c1 c4 = 0.1f, t a = t min to t max , unless otherwise noted. typical values are at t a = +25 c.) (note 2) timing characteristics max3222e/max3232e/max3241e (v cc = +3.0v to +5.5v, c1 c4 = 0.1f, t a = t min to t max , unless otherwise noted. typical values are at t a = +25 c.) (note 2) parameter conditions min typ max units v cc = 3.3v 0.6 1.1 input threshold low t a = +25 c v cc = 5.0v 0.8 1.5 v v cc = 3.3v 1.5 2.4 input threshold high t a = +25 c v cc = 5.0v 2.0 2.4 v input hysteresis 0.5 v input resistance t a = +25 c357k ? transmitter outputs output voltage swing all transmitter outputs loaded with 3k ? to ground 5 5.4 v output resistance v cc = 0, transmitter output = 2v 300 50k ? output short-circuit current 60 ma output leakage current v cc = 0 or 3v to 5.5v, v out = 12v, transmitters disabled (max3222e/max3232e/max3241e) 25 a mouse driveability (max3241e) transmitter output voltage t1in = t2in = gnd, t3in = v cc , t3out loaded with 3k ? to gnd, t1out and t2out loaded with 2.5ma each 5 v esd protection human body model 15 iec 1000-4-2 air-gap discharge (except max3237e) 15 r_in, t_out iec 1000-4-2 contact discharge (except max3237e) 8 kv human body model 15 iec1000-4-2 air-gap discharge 15 t_in, r_in, r_out, en , shdn , mbaud max3237e iec1000-4-2 contact discharge 8 kv parameter symbol conditions min typ max units maximum data rate r l = 3k ? , c l = 1000pf, one transmitter switching 250 kbps t phl 0.15 receiver propagation delay t plh receiver input to receiver output, c l = 150pf 0.15 s receiver output enable time normal operation (except max3232e) 200 ns receiver output disable time normal operation (except max3232e) 200 ns transmitter skew |t phl - t plh | (note 4) 100 ns receiver skew |t phl - t plh |50ns transition-region slew rate v cc = 3.3v, t a = +25 c, r l = 3k ? to 7k ? , measured from +3v to -3v or -3v to +3v, one transmitter switching c l = 150pf to 1000pf 6 30 v/s
__________________________________________ t ypical operating characteristics (v cc = +3.3v, 250kbps data rate, 0.1f capacitors, all transmitters loaded with 3k ? and c l , t a = +25 c, unless otherwise noted.) -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 0 1000 2000 3000 4000 5000 max3222e/max3232e transmitter output voltage vs. load capacitance max3237e toc01 load capacitance (pf) transmitter output voltage (v) t1 transmitting at 250kbps t2 transmitting at 15.6kbps v out+ v out- 0 6 2 4 10 8 14 12 16 0 1000 2000 3000 4000 5000 max3222e/max3232e slew rate vs. load capacitance max3237e toc02 load capacitance (pf) slew rate (v/ s) +slew for data rates up to 250kbps -slew 0 25 20 15 5 10 35 30 40 45 0 2000 1000 3000 4000 5000 max3222e/max3232e operating supply current vs. load capacitance max3237e toc03 load capacitance (pf) supply current (ma) 250kbps 120kbps 20kbps t1 transmitting at 250kbps t2 transmitting at 15.6kbps max3222e/max3232e/max3237e/max3241e 15kv esd-protected, down to 10na, 3.0v to 5.5v, up to 1mbps, true rs-232 transceivers 4 _______________________________________________________________________________________ timing characteristics max3237e (v cc = +3.0v to +5.5v, c1 c4 = 0.1f, t a = t min to t max , unless otherwise noted. typical values are at t a = +25 c.) (note 2) note 2: max3222e/max3232e/max3241e: c1 c4 = 0.1f tested at 3.3v 10%; c1 = 0.047f, c2, c3, c4 = 0.33f tested at 5.0v 10%. max3237e: c1 c4 = 0.1f tested at 3.3v 5%, c1 c4 = 0.22f tested at 3.3v 10%; c1 = 0.047f, c2, c3, c4 = 0.33f tested at 5.0v 10%. note 3: the max3237e logic inputs have an active positive feedback resistor. the input current goes to zero when the inputs are at the supply rails. note 4: transmitter skew is measured at the transmitter zero crosspoints. parameter conditions min typ max units r l = 3k ? , c l = 1000pf, one transmitter switching, mbaud = gnd 250 v cc = 3.0v to 4.5v, r l = 3k ? , c l = 250pf, one transmitter switching, mbaud = v cc 1000 maximum data rate v cc = 4.5v to 5.5v, r l = 3k ? , c l = 1000pf, one transmitter switching, mbaud = v cc 1000 kbps t phl 0.15 receiver propagation delay r_in to r_out, c l = 150pf t plh 0.15 s receiver output enable time normal operation 2.6 receiver output disable time normal operation 2.4 s | t phl - t plh |, mbaud = gnd transmitter skew | t phl - t plh |, mbaud = v cc 100 ns receiver skew | t phl - t plh |50ns mbaud = gnd 630 c l = 150pf to 1000pf mbaud = v cc 24 150 v cc = 3.3v, r l = 3k ? to 7k ? , +3v to -3v or -3v to +3v, t a = +25 c c l = 150pf to 2500pf, mbaud = gnd 430 v/s transition-region slew rate
max3222e/max3232e/max3237e/max3241e 15kv esd-pr otected, down to 10na, 3.0v to 5.5v , up to 1mbps, t r ue rs-232 t ransceivers _______________________________________________________________________________________ 5 -6 -2 -4 2 0 4 6 -5 -3 1 -1 3 5 0 1000 1500 500 2000 2500 3000 max3237e toc07 load capacitance (pf) transmitter output voltage (v) v out- v out + for data rates up to 250kbps 1 transmitter 250kbps 4 transmitters 15.6kbps all transmitters loaded with 3k ? + c l max3237e transmitter output voltage vs. load capacitance 0 10 20 30 50 40 60 70 0 max3237e slew rate vs. load capacitance (mbaud = v cc ) max3237e toc10 load capacitance (pf) slew rate (v/ s) 500 1000 1500 2000 -slew, 1mbps +slew, 1mbps 1 transmitter at full data rate 4 transmitters at 1/16 data rate 3k ? + c l load each output -slew, 2mbps +slew, 2mbps -7.5 -5.0 -2.5 0 2.5 5.0 7.5 0 max3237e transmitter output voltage vs. load capacitance (mbaud = v cc ) max3237e toc08 load capacitance (pf) transmitter output voltage (v) 500 1000 1500 2000 1 transmitter at full data rate 4 transmitters at 1/16 data rate 3k ? + c l load, each output 2mbps 1.5mbps 1mbps 2mbps 1mbps 1.5mbps 0 2 4 6 8 10 12 0 max3237e slew rate vs. load capacitance (mbaud = gnd) max3237e toc09 load capacitance (pf) slew rate (v/ s) 1000 1500 500 2000 2500 3000 sr+ sr- 1 transmitter at 250kbps 4 transmitters at 15.6kbps all transmitters loaded with 3k ? + c l 0 10 20 30 40 50 0 max3237e supply current vs. load capacitance when transmitting data (mbaud = gnd) max3237e toc11 load capacitance (pf) supply current (ma) 1000 1500 500 2000 2500 3000 250kbps 120kbps 20kbps 1 transmitter at 20kbps, 120kbps, 250kbps 4 transmitters at 15.6kbps all transmitters loaded with 3k ? + c l 0 20 60 40 80 100 0 max3237e transmitter skew vs. load capacitance (mbaud = v cc ) max3237e toc12 load capacitance (pf) 1000 1500 500 2000 transmitter skew (ns) |t plh - t phl | 1 transmitter at 500kbps 4 transmitters at 1/16 data rate all transmitters loaded with 3k ? + c l typical operating characteristics (continued) (v cc = +3.3v, 250kbps data rate, 0.1f capacitors, all transmitters loaded with 3k ? and c l , t a = +25 c, unless otherwise noted.) -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 0 1000 2000 3000 4000 5000 max3241e transmitter output voltage vs. load capacitance max3237e to04 load capacitance (pf) transmitter output voltage (v) 1 transmitter at 250kbps 2 transmitters at 15.6kbps v out+ v out- 0 30 20 10 40 50 60 0 2000 1000 3000 4000 5000 max3241e operating supply current vs. load capacitance max3237e toc06 load capacitance (pf) supply current (ma) 250kbps 120kbps 20kbps 1 transmitter at 250kbps 2 transmitters at 15.6kbps 0 4 2 8 6 12 10 14 0 1000 2000 3000 4000 5000 max3241e slew rate vs. load capacitance max3237e toc05 load capacitance (pf) slew rate (v/ s)
pin description max3222e/max3232e/max3237e/max3241e 15kv esd-protected, down to 10na, 3.0v to 5.5v, up to 1mbps, true rs-232 transceivers 6 _______________________________________________________________________________________ typical operating characteristics (continued) (v cc = +3.3v, 250kbps data rate, 0.1f capacitors, all transmitters loaded with 3k ? and c l , t a = +25 c, unless otherwise noted.) -6 -2 -4 2 0 4 6 -3 -5 1 -1 3 5 2.0 3.0 3.5 2.5 4.0 4.5 5.0 max3237e toc13 supply voltage (v) transmitter output voltage (v) v out- v out + 1 transmitter at 250kbps 4 transmitters at 15.6kbps all transmitters loaded with 3k ? +1000pf max3237e transmitter output voltage vs. supply voltage (mbaud = gnd) 0 10 20 30 40 50 2.0 max3237e supply current vs. supply voltage (mbaud = gnd) max3237e toc14 supply voltage (v) supply current (ma) 3.0 3.5 2.5 4.0 4.5 5.0 1 transmitter at 250kbps 4 transmitters at 15.6kbps all transmitters loaded with 3k ? and 1000pf pin max3222e max3232e max3241e so/dip tssop/ ssop so/dip tssop/ ssop max3237e ssop/so qfn name function 11 13* 23 22 en receiver enable. active low. 2 2 1 2 28 28 28 c1+ positive terminal of voltage- doubler charge-pump capacitor 3 3 2 3 27 27 27 v+ +5.5v generated by the charge pump 4 4 3 4 25 24 23 c1- negative terminal of voltage- doubler charge-pump capacitor 5 5 4 5 1 1 29 c2+ positive terminal of inverting charge-pump capacitor 6 6 5 6 3 2 30 c2- negative terminal of inverting charge-pump capacitor 7 7 6 7 4 3 31 v- -5.5v generated by the charge pump 8, 15 8, 17 7, 14 8, 17 5, 6, 7, 10, 12 9, 10, 11 6, 7, 8 t_out rs-232 transmitter outputs 9, 14 9, 16 8, 13 9, 16 8, 9, 11 4 81 5 r_in rs-232 receiver inputs 10, 13 10, 15 9, 12 12, 15 18, 20, 21 15 19 13, 14, 15, 17, 18 r_out ttl/cmos receiver outputs 11, 12 12, 13 10, 11 13, 14 17*, 19*, 22*, 23*, 24* 12, 13, 14 10, 11, 12 t_in ttl/cmos transmitter inputs
max3222e/max3232e/max3237e/max3241e 15kv esd-protected, down to 10na, 3.0v to 5.5v, up to 1mbps, true rs-232 transceivers _______________________________________________________________________________________ 7 pin description (continued) * these pins have an active positive feedback resistor internal to the max3237e, allowing unused inputs to be left unconnected. max3222e max3232e max3237e max3241e 5k ? r_ in r_ out c2- c2+ c1- c1+ v- v+ v cc c4 c3 c1 c2 0.1 f v cc t_ out t_ in gnd 7k ? 150pf max3222e max3232e max3237e max3241e 5k ? r_ in r_ out c2- c2+ c1- c1+ v- v+ v cc c4 c3 c1 c2 0.1 f v cc t_ out t_ in gnd 3k ? 2500pf minimum slew-rate test circuit maximum slew-rate test circuit figure 1. slew-rate test circuits pin max3222e max3232e max3241e so/dip tssop/ ssop so/dip tssop/ ssop max3237e ssop/so qfn name function 16 18 15 18 2 25 24 gnd ground 17 19 16 19 26 26 26 v cc +3.0v to +5.5v supply voltage 18 20 14* 22 21 shdn shutdown control. active low. 11, 14 1, 10, 11, 20 9, 16, 25, 32 n.c. no connection 15* mbaud megabaud control input. connect to gnd for normal operation; connect to v cc for 1mbps transmission rates. 16 20, 21 19, 20 r_outb noninverting complementary receiver outputs. always active.
max3222e/max3232e/max3237e/max3241e 15kv esd-protected, down to 10na, 3.0v to 5.5v, up to 1mbps, true rs-232 transceivers _______________detailed description dual charge-pump voltage converter the max3222e/max3232e/max3237e/max3241e s internal power supply consists of a regulated dual charge pump that provides output voltages of +5.5v (doubling charge pump) and -5.5v (inverting charge pump), over the 3.0v to 5.5v v cc range. the charge pump operates in discontinuous mode; if the output voltages are less than 5.5v, the charge pump is enabled, and if the output voltages exceed 5.5v, the charge pump is disabled. each charge pump requires a flying capacitor (c1, c2) and a reservoir capacitor (c3, c4) to generate the v+ and v- supplies ( figure 1). rs-232 transmitters the transmitters are inverting level translators that con- vert ttl/cmos-logic levels to 5.0v eia/tia-232 com- pliant levels. the max3222e/max3232e /max3237e /max3241e transmitters guarantee a 250kbps data rate with worst- case loads of 3k ? in parallel with 1000pf, providing compatibility with pc-to-pc communication software (such as laplink ). transmitters can be paralleled to drive multiple receivers or mice. the max3222e/max3237e/max3241e s transmitters are disabled and the outputs are forced into a high-imped- ance state when the device is in shutdown mode ( shdn = gnd). the max3222e/max3232e/max3237e/max3241e permit the outputs to be driven up to 12v in shutdown. the max3222e/max3232e/max3241e transmitter inputs do not have pullup resistors. connect unused inputs to gnd or v cc . the max3237e s transmitter inputs have a 400k ? active positive feedback resistor, allowing unused inputs to be left unconnected. max3237e megabaud operation for higher-speed serial communications, the max3237e features megabaud operation. in megabaud operating mode (mbaud = v cc ), the max3237e transmitters guarantee a 1mbps data rate with worst-case loads of 3k ? in parallel with 250pf for 3.0v < v cc < 4.5v. for 5v 10% operation, the max3237e transmitters guarantee a 1mbps data rate into worst-case loads of 3k ? in parallel with 1000pf. rs-232 receivers the receivers convert rs-232 signals to cmos-logic output levels. the max3222e/ max3237e/ max3241e receivers have inverting three-state outputs. drive en high to place the receiver(s) into a high-impedance state. receivers can be either active or inactive in shut- down (table 1). the complementary outputs on the max3237e/max3241e (r_outb) are always active, regardless of the state of en or shdn . this allows the device to be used for ring indica- tor applications without forward biasing other devices con- nected to the receiver outputs. this is ideal for systems where v cc drops to 0 in shutdown to accommodate peripherals such as uarts (figure 2). max3222e/max3237e/max3241e shutdown mode supply current falls to less than 1a in shutdown mode ( shdn = low). the max3237e s supply current falls to10na (typ) when all receiver inputs are in the invalid range (-0.3v < r_in < +0.3). when shut down, the device s charge pumps are shut off, v+ is pulled down to v cc , v- is pulled to ground, and the transmitter outputs are disabled (high impedance). the time required to recover from shutdown is typically 100s, as shown in figure 3. connect shdn to v cc if the shut- down mode is not used. shdn has no effect on r_out or r_outb (max3237e/max3241e). 15kv esd protection as with all maxim devices, esd-protection structures are incorporated to protect against electrostatic dis- charges encountered during handling and assembly. the driver outputs and receiver inputs of the max3222e/max3232e/max3237e/max3241e have extra protection against static electricity. maxim s engi- neers have developed state-of-the-art structures to pro- tect these pins against esd of 15kv without damage. the esd structures withstand high esd in all states: normal operation, shutdown, and powered down. after an esd event, maxim s e versions keep working without latchup, whereas competing rs-232 products can latch and must be powered down to remove latchup. furthermore, the max3237e logic i/o pins also have 15kv esd protection. protecting the logic i/o pins to 15kv makes the max3237e ideal for data cable appli- cations. table 1. max3222e/max3237e/max3241e shutdown and enable control truth table laplink is a trademark of traveling software. 0 active 0 1 high-z 0 en r_out shdn active high-z active 1 0 active 1 1 r_outb (max3237e/ max3241e) active active high-z high-z t_out active active 8 ______________________________________________________________________________________
max3222e/max3232e/max3237e/max3241e 15kv esd-protected, down to 10na, 3.0v to 5.5v, up to 1mbps, true rs-232 transceivers _______________________________________________________________________________________ 9 esd protection can be tested in various ways; the transmitter outputs and receiver inputs for the max3222e/max3232e/max3237e/max3241e are characterized for protection to the following limits: 15kv using the human body model 8kv using the contact discharge method specified in iec 1000-4-2 15kv using iec 1000-4-2 s air-gap discharge method esd test conditions esd performance depends on a variety of conditions. contact maxim for a reliability report that documents test setup, test methodology, and test results. human body model figure 4a shows the human body model, and figure 4b shows the current waveform it generates when dis- charged into a low impedance. this model consists of a 100pf capacitor charged to the esd voltage of inter- est, which is then discharged into the test device through a 1.5k ? resistor. iec 1000-4-2 the iec 1000-4-2 standard covers esd testing and per- formance of finished equipment; it does not specifically refer to integrated circuits. the max3222e/max3232e/ max3237e/max3241e help you design equipment that meets level 4 (the highest level) of iec 1000-4-2, without the need for additional esd-protection components. the major difference between tests done using the human body model and iec 1000-4-2 is higher peak current in iec 1000-4-2 because series resistance is lower in the iec 1000-4-2 model. hence, the esd with- stand voltage measured to iec 1000-4-2 is generally lower than that measured using the human body model. figure 5a shows the iec 1000-4-2 model, and figure 5b shows the current waveform for the 8kv iec 1000-4-2 level 4 esd contact discharge test. the air-gap discharge test involves approaching the device with a charged probe. the contact discharge t1out r1outb tx 5k ? uart v cc t1in logic transition detector r1in r1out three-stated en = v cc shdn = gnd v cc to p rx previous rs-232 tx uart protection diode protection diode shdn = gnd v cc v cc gnd rx 5k ? a ) older rs-232: powered-down uart draws current from active receiver output in shutdown. b ) new max3237e/max3241e: en shuts down receiver outputs (except for b outputs), so no current flows to uart in shutdown. b outputs indicate receiver activity during shutdown with en high. gnd max3237e/max3241e figure 2. detection of rs-232 activity when the uart and interface are shut down; comparison of max3237e/max3241e (b) with previous transceivers (a) 40 s/div shdn t2out t1out 5v/div 0 2v/div 0 v cc = 3.3v c1?4 = 0.1 f figure 3. transmitter outputs recovering from shutdown or powering up
max3222e/max3232e/max3237e/max3241e 15kv esd-protected, down to 10na, 3.0v to 5.5v, up to 1mbps, true rs-232 transceivers 10 ______________________________________________________________________________________ method connects the probe to the device before the probe is energized. machine model the machine model for esd tests all pins using a 200pf storage capacitor and zero discharge resis- tance. its objective is to emulate the stress caused by contact that occurs with handling and assembly during manufacturing. all pins require this protection during manufacturing, not just rs-232 inputs and outputs. therefore, after pc board assembly, the machine model is less relevant to i/o ports. applications information capacitor selection the capacitor type used for c1 c4 is not critical for proper operation; polarized or nonpolarized capacitors can be used. the charge pump requires 0.1f capaci- tors for 3.3v operation. for other supply voltages, see table 2 for required capacitor values. do not use val- ues smaller than those listed in table 2. increasing the capacitor values (e.g., by a factor of 2) reduces ripple on the transmitter outputs and slightly reduces power consumption. c2, c3, and c4 can be increased without changing c1 s value. however, do not increase c1 without also increasing the values of c2, c3, c4, and c bypass to maintain the proper ratios (c1 to the other capacitors) . charge-current limit resistor discharge resistance storage capacitor c s 100pf r c 1m ? r d 1500 ? high- voltage dc source device under test figure 4a. human body esd test model i p 100% 90% 36.8% t rl time t dl current waveform peak-to-peak ringing (not drawn to scale) i r 10% 0 0 amperes figure 4b. human body model current waveform charge-current limit resistor discharge resistance storage capacitor c s 150pf r c 50m ? to 100m ? r d 330 ? high- voltage dc source device under test figure 5a. iec 1000-4-2 esd test model t r = 0.7ns to 1ns 30ns 60ns t 100% 90% 10% i peak i figure 5b. iec 1000-4-2 esd generator current waveform
max3222e/max3232e/max3237e/max3241e 15kv esd-protected, down to 10na, 3.0v to 5.5v, up to 1mbps, true rs-232 transceivers ______________________________________________________________________________________ 11 when using the minimum required capacitor values, make sure the capacitor value does not degrade excessively with temperature. if in doubt, use capaci- tors with a larger nominal value. the capacitor s equiv- alent series resistance (esr), which usually rises at low temperatures, influences the amount of ripple on v+ and v-. power-supply decoupling in most circumstances, a 0.1f v cc bypass capacitor is adequate. in applications that are sensitive to power- supply noise, use a capacitor of the same value as charge-pump capacitor c1. connect bypass capaci- tors as close to the ic as possible. operation down to 2.7v transmitter outputs will meet eia/tia-562 levels of 3.7v with supply voltages as low as 2.7v. transmitter outputs when recovering from shutdown figure 3 shows two transmitter outputs when recover- ing from shutdown mode. as they become active, the two transmitter outputs are shown going to opposite rs-232 levels (one transmitter input is high, the other is low). each transmitter is loaded with 3k ? in parallel with 2500pf. the transmitter outputs display no ringing or undesirable transients as they come out of shutdown. note that the transmitters are enabled only when the magnitude of v- exceeds approximately -3v. mouse driveability the max3241e has been specifically designed to power serial mice while operating from low-voltage power supplies. it has been tested with leading mouse brands from manufacturers such as microsoft and logitech. the max3241e successfully drove all serial mice tested and met their respective current and volt- age requirements. figure 6a shows the transmitter out- put voltages under increasing load current at 3.0v. figure 6b shows a typical mouse connection using the max3241e. high data rates the max3222e/max3232e/max3237e/max3241e maintain the rs-232 5.0v minimum transmitter output voltage even at high data rates. figure 7 shows a trans- mitter loopback test circuit. figure 8 shows a loopback test result at 120kbps, and figure 9 shows the same test at 250kbps. for figure 8, all transmitters were driven simultaneously at 120kbps into rs-232 loads in parallel with 1000pf. for figure 9, a single transmitter was driv- en at 250kbps, and all transmitters were loaded with an rs-232 receiver in parallel with 1000pf. the max3237 maintains the rs-232 5.0v minimum transmitter output voltage at data rates up to 1mbps. figure 10 shows a loopback test result at 1mbps with mbaud = v cc . for figure 10, all transmitters were loaded with an rs-232 receiver in parallel with 250pf. interconnection with 3v and 5v logic the max3222e/max3232e/max3237e/max3241e can directly interface with various 5v logic families, includ- ing act and hct cmos. see table 3 for more infor- mation on possible combinations of interconnections. table 2. required minimum capacitor values 0.047 c1 (f) 0.1 0.33 c2, c3, c4 (f) 0.47 max3222e/max3232e/max3241e 4.5 to 5.5 v cc (v) 3.0 to 5.5 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 012345678910 max3222e-fig06a load current per transmitter (ma) transmitter output voltage (v) v out+ v out- v out+ v out- v cc v cc = 3.0v figure 6a. max3241e transmitter output voltage vs. load current per transmitter 0.1 0.1 3.0 to 3.6 0.22 0.22 3.0 to 3.6 0.1 0.047 0.1 0.33 max3237e 3.15 to 3.6 4.5 to 5.5 0.22 1.0 3.0 to 5.5
max3222e/max3232e/max3237e/max3241e 15kv esd-protected, down to 10na, 3.0v to 5.5v, up to 1mbps, true rs-232 transceivers 12 ______________________________________________________________________________________ max3241e en 23 r5out 15 r4out 16 r3out 17 r2out 18 r1out 19 r2outb 20 r1outb 21 5k ? 5k ? 5k ? 5k ? 5k ? r5in 8 v cc r4in 7 6 r2in 5 r1in 4 shdn 22 gnd 25 t3in 12 t2in 13 t1in 14 c2- 2 c2+ 1 c1- 24 c1+ 28 t3out 11 +v computer serial port mouse +v -v gnd tx t2out 10 t1out 9 v- 3 v+ 27 v cc v cc c4 c3 c1 c2 c bypass v cc = 3v to 5.5v 26 r3in figure 6b. mouse driver test circuit
max3222e/max3232e/max3237e/max3241e 15kv esd-protected, down to 10na, 3.0v to 5.5v, up to 1mbps, true rs-232 transceivers ______________________________________________________________________________________ 13 figure 7. loopback test circuit 2 s/div t1in t1out r1out 5v/div 5v/div 5v/div v cc = 3.3v c1 c4 = 0.1 f figure 8. max3241e loopback test result at 120kbps 2 s/div t1in t1out r1out 5v/div 5v/div 5v/div v cc = 3.3v, c1 c4 = 0.1 f figure 9. max3241e loopback test result at 250kbps +5v 0 +5v 0 -5v +5v 0 t_in t_out 5k ? + 250pf r_out 400ns/div v cc = 3.3v c1 c4 = 0.1 f figure 10. max3237e loopback test result at 1000kbps (mbaud = v cc ) table 3. logic-family compatibility with various supply voltages system power-supply voltage (v) v cc supply voltage (v) compatibility 3.3 3.3 compatible with all cmos families 5 5 compatible with all ttl and cmos fami- lies 5 3.3 compatible with act and hct cmos, and with ac, hc, or cd4000 cmos max3222e max3232e max3237e max3241e 5k ? r_ in r_ out c2- c2+ c1- c1+ v- v+ v cc c4 c3 c1 c2 0.1 f v cc t_ out t_ in gnd 1000pf
max3222e/max3232e/max3237e/max3241e 15kv esd-protected, down to 10na, 3.0v to 5.5v, up to 1mbps, true rs-232 transceivers 14 ______________________________________________________________________________________ __________________________________________________________pin configurations 20 19 18 17 16 15 14 13 1 2 3 8 12 11 10 4 5 6 7 shdn v cc gnd t1out c1- v+ c1+ en r1in r1out t1in t2in t2out v- c2- c2+ 9 r2in r2out tssop/ssop n.c. n.c. max3222e 20 19 18 17 16 15 14 13 1 2 3 8 12 11 10 4 5 6 7 n.c. v cc gnd t1out c1- v+ c1+ n.c. r1in r1out t2in r2out t2out v- c2- c2+ 9 r2in n.c. tssop t1in n.c. max3232e 16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8 v cc gnd t1out r1in c2+ c1- v+ c1+ max3232e r1out t1in t2in r2out r2in t2out v- c2- ssop/so/dip 28 27 26 25 24 23 22 21 20 19 18 17 16 15 1 2 3 4 5 6 7 8 9 10 11 12 13 14 c1+ v+ v cc gnd c1- en r5out shdn r1outb r2outb r1out r2out r3out r4out t1in t2in t3in t3out t2out t1out r5in r4in r3in r2in r1in v- c2- c2+ ssop/so/tssop qfn max3241e top view 28 27 26 25 24 23 22 21 20 19 18 17 16 15 1 2 3 4 5 6 7 8 9 10 11 12 13 14 c1+ v+ v cc c1- t1in t2in mbaud t3in r1out r2out t4in r3out t5in r1outb shdn en t5out r3in t4out r2in r1in t3out t2out t1out v- c2- gnd c2+ ssop max3237e 18 17 16 15 14 13 12 11 1 2 3 4 5 6 7 8 shdn v cc gnd t1out c1- v+ c1+ en r1in r1out t1in t2in t2out v- c2- c2+ 10 9 r2out r2in so/dip max3222e 32 31 30 29 28 27 26 n.c. v- c2- c2+ c1+ v+ v cc 25 n.c. 9 10 11 12 13 14 15 n.c. t3in t2in t1in r5out r4out r3out 16 n.c. 17 18 19 20 21 22 23 r2out r1out r2outb r1outb shdn en c1- 8 7 6 5 4 3 2 t3out t2out t1out r5in r4in r3in r2in max3241e 1 r1in 24 gnd top view
max3222e/max3232e/max3237e/max3241e 15kv esd-protected, down to 10na, 3.0v to 5.5v, up to 1mbps, true rs-232 transceivers ______________________________________________________________________________________ 15 __________________________________________________typical operating circuits r2out 10 1 r1out 13 r2in 9 18 gnd 16 rs-232 outputs ttl/cmos inputs t2in 11 t1in 12 c2- 6 c2+ 5 c1- 4 c1+ 2 r1in 14 t2out 8 t1out 15 v- 7 v+ 3 v cc 17 c1 0.1 f c2 0.1 f c bypass +3.3v rs-232 inputs ttl/cmos outputs 5k ? 5k ? en shdn c3 * 0.1 f c4 0.1 f note: pin numbers refer to so/dip packages. * c3 can be returned to either v cc or ground. r2out 9 r1out 12 r2in 8 gnd 15 rs-232 outputs ttl/cmos inputs t2in 10 t1in 11 c2- 5 c2+ 4 c1- 3 c1+ 1 r1in 13 t2out 7 t1out 14 v- 6 v+ 2 v cc c4 0.1 f 16 c1 0.1 f c2 0.1 f c bypass +3.3v rs-232 inputs ttl/cmos outputs c3 * 0.1 f 5k ? 5k ? see table 2 for capacitor selection. max3222e max3232e
max3222e/max3232e/max3237e/max3241e 15kv esd-protected, down to 10na, 3.0v to 5.5v, up to 1mbps, true rs-232 transceivers 16 ______________________________________________________________________________________ _____________________________________typical operating circuits (continued) en 23 r5out 15 r4out 16 r3out 17 r2out 18 r1out 19 r2outb 20 r1outb 21 ttl/cmos outputs 5k ? 5k ? 5k ? 5k ? 5k ? r5in 8 * c3 can be returned to either v cc or ground. r4in 7 r3in 6 r2in 5 r1in 4 rs-232 inputs shdn 22 gnd 25 rs-232 outputs ttl/cmos inputs t3in 12 t2in 13 t1in 14 c2- 2 c2+ 1 c1- 24 c1+ 28 t3out 11 t2out 10 t1out 9 v- 3 v+ 27 v cc c4 0.1 f c3 * 0.1 f c1 0.1 f c2 0.1 f 26 en 13 r3out 18 r2out 20 r1out 21 r1outb 16 logic outputs 5k ? 5k ? 5k ? r3in 11 r2in 9 r1in 8 rs-232 inputs gnd 2 rs-232 outputs logic inputs t3in 22 t2in 23 t1in 24 c2- 3 c2+ 1 c1- 25 c1+ 28 t3out 7 t2out 6 t1out 5 t1 t2 t3 r1 r2 r3 v- 4 v+ 27 v cc 0.1 f 0.1 f 0.1 f 0.1 f 26 mbaud 15 t5in 17 t4in 19 t5out 12 t4out 10 shdn 14 t4 t5 c3* +3.3v c bypass c bypass +3.3v max3241e max3237e
max3222e/max3232e/max3237e/max3241e 15kv esd-protected, down to 10na, 3.0v to 5.5v, up to 1mbps, true rs-232 transceivers ______________________________________________________________________________________ 17 ordering information (continued) * dice are tested at t a = +25?, dc parameters only. ___________________ chip information transistor count: max3222e/max3232e: 1129 max3237e: 2110 max3241e: 1335 18 plastic dip -40 c to +85 c max3222eepn 18 wide so -40 c to +85 c max3222eewn 20 ssop -40 c to +85 c max3222eeap 20 tssop -40 c to +85 c max3222eeup dice* 0 c to +70 c max3222ec/d 18 plastic dip 0 c to +70 c max3222ecpn 20 tssop 0 c to +70 c max3232ecup 28 ssop 28 ssop -0 c to +70 c -40 c to +85 c max3237eeai max3237e cai 28 wide so 28 ssop -40 c to +85 c -40 c to +85 c max3241eewi max3241eeai 28 wide so 28 ssop 0 c to +70 c 0 c to +70 c max3241ecwi max3241e cai 16 plastic dip 16 wide so -40 c to +85 c -40 c to +85 c max3232eepe max3232eewe 16 ssop 20 tssop -40 c to +85 c -40 c to +85 c max3232eeae max3232eeup 16 plastic dip 0 c to +70 c max3232ecpe 16 wide so 16 ssop 18 wide so pin-package temp range 0 c to +70 c 0 c to +70 c 0 c to +70 c max3232ecwe max3232e cae max3222ecwn part 32 qfn 0 c to +70 c max3241ecgj 28 tssop -40 c to +85 c max3241eeui 28 tssop 0 c to +70 c max3241ecui
max3222e/max3232e/max3237e/max3241e 15kv esd-protected, down to 10na, 3.0v to 5.5v, up to 1mbps, true rs-232 transceivers 18 ______________________________________________________________________________________ tssop.eps package information (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline info rmation, go to www.maxim-ic.com/packages .)
15kv esd-protected, down to 10na, 3.0v to 5.5v, up to 1mbps, true rs-232 transceivers maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circu it patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. 19 ____________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 ? 2001 maxim integrated products printed usa is a registered trademark of maxim integrated products. max3222e/max3232e/max3237e/max3241e ssop.eps package information (continued) (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline info rmation, go to www.maxim-ic.com/packages .)

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