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_______________general description the max3222/MAX3232/max3237/max3241 trans- ceivers have a proprietary low-dropout transmitter out- put stage enabling true rs-232 performance from a 3.0v to 5.5v supply with a dual charge pump. the devices require only four small 0.1? external charge- pump capacitors. the max3222, MAX3232, and max3241 are guaranteed to run at data rates of 120kbps while maintaining rs-232 output levels. the max3237 is guaranteed to run at data rates of 250kbps in the normal operating mode and 1mbps in the megabaud operating mode, while maintaining rs-232 output levels. the max3222/MAX3232 have 2 receivers and 2 drivers. the max3222 features a 1? shutdown mode that reduces power consumption and extends battery life in portable systems. its receivers remain active in shutdown mode, allowing external devices such as modems to be monitored using only 1? supply cur- rent. the max3222 and MAX3232 are pin, package, and functionally compatible with the industry-standard max242 and max232, respectively. the max3241 is a complete serial port (3 drivers/ 5 receivers) designed for notebook and subnotebook computers. the max3237 (5 drivers/3 receivers) is ideal for fast modem applications. both these devices feature a shutdown mode in which all receivers can remain active while using only 1? supply current. receivers r1 (max3237/max3241) and r2 (max3241) have extra out- puts in addition to their standard outputs. these extra outputs are always active, allowing external devices such as a modem to be monitored without forward bias- ing the protection diodes in circuitry that may have v cc completely removed. the max3222, max3237, and max3241 are available in space-saving ssop packages. ________________________applications notebook, subnotebook, and palmtop computers high-speed modems battery-powered equipment hand-held equipment peripherals printers ____________________________features ? low supply current: 300? (max3222/MAX3232/max3241) 500? (max3237) ? guaranteed data rate: 120kbps (max3222/MAX3232/max3241) 250kbps (max3237?ormal operation) 1mbps (max3237?egabaud operation) ? 1? low-power shutdown with receivers active (max3222/max3237/max3241) ? flow-through pinout (max3237) ? meets eia/tia-232 specifications down to 3.0v ? guaranteed mouse driveability (max3241) ? pin compatible with industry-standard max232 (MAX3232) pin compatible with industry-standard max242 (max3222) ? guaranteed slew rate: 6v/? (max3222/MAX3232/max3237/max3241) 24v/? (max3237?egabaud operation) max3222/MAX3232/max3237/max3241* 3.0v to 5.5v, low-power, up to 1mbps, true rs-232 transceivers using four 0.1? external capacitors ________________________________________________________________ maxim integrated products 1 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 top view r1in r1out t1in t2in t2out v- c2- c2+ 10 9 r2out r2in dip/so max3222 _________________pin configurations ______________ordering information 19-0273; rev 4; 6/96 part max3222 cpn max3222cwn max3222cap 0? to +70? 0? to +70? 0? to +70? temp. range pin-package 18 plastic dip 18 so 20 ssop megabaud is a trademark of maxim integrated products. *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 pending. typical operating circuits appear at end of data sheet. pin configurations continued at end of data sheet. ordering information continued at end of data sheet. for free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
? max3222/MAX3232/max3237/max3241 3.0v to 5.5v, low-power, up to 1mbps, true rs-232 transceivers using four 0.1? external capacitors 2 _______________________________________________________________________________________ absolute maximum ratings electrical characteristics (v cc = +3.0v to +5.5v, c1?4 = 0.1? (note 2), t a = t min to t max , unless otherwise noted. typical values are at t a = +25?.) stresses beyond those listed under ?bsolute maximum ratings?may cause permanent damage to the device. these are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. note 1: v+ and v- can have a maximum magnitude of 7v, but their absolute difference cannot exceed 13v. v cc ...........................................................................-0.3v to +6v v+ (note 1) ...............................................................-0.3v to +7v v- (note 1) ................................................................+0.3v to -7v v+ + v- (note 1)...................................................................+13v input voltages t_in, shdn , en ...................................................-0.3v to +6v mbaud...................................................-0.3v to (v cc + 0.3v) r_in .................................................................................?5v output voltages t_out...........................................................................?3.2v r_out ....................................................-0.3v to (v cc + 0.3v) short-circuit duration t_out ....................................................................continuous continuous power dissipation (t a = +70?) 16-pin plastic dip (derate 10.53mw/? above +70?)... 842mw 16-pin narrow so (derate 8.70mw/? above +70?) .... 696mw 16-pin wide so (derate 9.52mw/? above +70?)........ 762mw 18-pin plastic dip (derate 11.11mw/? above +70?) .. 889mw 18-pin so (derate 9.52mw/? above +70?)..............762mw 20-pin ssop (derate 8.00mw/? above +70?) .........640mw 28-pin so (derate 12.50mw/? above +70?) .....................1w 28-pin ssop (derate 9.52mw/? above +70?) .........762mw operating temperature ranges max32_ _c_ _.....................................................0? to +70? max32_ _e_ _ .................................................-40? to +85? storage temperature range .............................-65? to +150? lead temperature (soldering, 10sec) .............................+300? t a = +25? i out = -1.0ma i out = 1.6ma receivers disabled t_in, en , shdn , mbaud t_in, en , shdn , mbaud conditions k 357 input resistance v 0.3 input hysteresis v 0.8 1.5 input threshold low 0.6 1.2 v -25 25 input voltage range 0.5 2.0 v cc power-supply current v v cc - 0.6 v cc - 0.1 output voltage high v 0.4 output voltage low ? ?.05 ?0 output leakage current ? ?.01 ?.0 input leakage current v 0.8 input logic threshold low (note 3) units min typ max parameter v cc = 3.3v v cc = 5.0v v cc = 3.3v v cc = 5.0v v 1.8 2.4 input threshold high 1.5 2.4 v cc = 3.3v v cc = 5.0v 2.0 v 2.4 input logic threshold high (note 3) no load, v cc = 3.3v or 5.0v, t a = +25? ma 0.3 1.0 max3222/MAX3232/ max3241 max3237 shdn = gnd, t a = +25? ? 1.0 10 shutdown supply current dc characteristics logic inputs and receiver outputs receiver inputs
max3222/MAX3232/max3237/max3241 3.0v to 5.5v, low-power, up to 1mbps, true rs-232 transceivers using four 0.1? external capacitors _______________________________________________________________________________________ 3 timing characteristics?ax3222/MAX3232/max3241 (v cc = +3.0v to +5.5v, c1?4 = 0.1? (note 2), t a = t min to t max , unless otherwise noted. typical values are at t a = +25?.) electrical characteristics (continued) (v cc = +3.0v to +5.5v, c1?4 = 0.1? (note 2), t a = t min to t max , unless otherwise noted. typical values are at t a = +25?.) t1in = t2in = gnd, t3in = v cc , t3out loaded with 3k to gnd, t1out and t2out loaded with 2.5ma each conditions v ?.0 transmitter output voltage units min typ max parameter all transmitter outputs loaded with 3k to ground v ?.0 ?.4 output voltage swing ma ?5 ?0 output short-circuit current v cc = v+ = v- = 0v, t out = 2v 300 10m output resistance v out = 12v, v cc = 0v to 5.5v, transmitters disabled ? ?5 output leakage current t phl r l = 3k , c l = 1000pf, one transmitter switching t plh | t phl - t plh | | t phl - t plh | normal operation normal operation conditions 0.3 ? 0.3 receiver propagation delay kbps 120 235 maximum data rate ns 300 receiver skew ns 300 transmitter skew ns 200 receiver output disable time ns 200 receiver output enable time units min typ max parameter 630 v cc = 3.3v, r l = 3 to 7k , +3v to -3v or -3v to +3v, t a = +25? v/? 430 transition-region slew rate transmitter outputs mouse driveability (max3241) r_in to r_out, c l = 150pf c l = 150pf to 1000pf c l = 150pf to 2500pf
max3222/MAX3232/max3237/max3241 3.0v to 5.5v, low-power, up to 1mbps, true rs-232 transceivers using four 0.1? external capacitors 4 _______________________________________________________________________________________ __________________________________________typical operating characteristics (v cc = +3.3v, 235kbps data rate, 0.1? capacitors, all transmitters loaded with 3k , t a = +25?, unless otherwise noted.) -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 0 max3222/MAX3232 transmitter output voltage vs. load capacitance max3222-01 load capacitance (pf) transmitter output voltage (v) 2000 3000 1000 4000 5000 v out + v out - 0 2 4 6 8 10 12 14 16 18 20 22 150 max3222/MAX3232 slew rate vs. load capacitance max3222-02 load capacitance (pf) slew rate (v/ m s) 2000 3000 1000 4000 5000 for data rates up to 235kbps +slew -slew 0 5 10 15 20 25 30 35 40 0 max3222/MAX3232 supply current vs. load capacitance when transmitting data max3222-03 load capacitance (pf) supply current (ma) 2000 3000 1000 4000 5000 235kbps 120kbps 20kbps r l = 3k , c l = 1000pf, one transmitter switching, mbaud = gnd normal operation conditions normal operation ns 200 receiver output disable time | t phl - t plh | , mbaud = gnd ns 100 0.15 250 ? 0.15 receiver propagation delay ns 200 receiver output enable time units min typ max parameter timing characteristics?ax3237 (v cc = +3.0v to +5.5v, c1?4 = 0.1? (note 2), t a = t min to t max , unless otherwise noted. typical values are at t a = +25?.) v cc = 3.0v to 4.5v, r l = 3k , c l = 250pf, one transmitter switching, mbaud = v cc 1000 v cc = 4.5v to 5.5v, r l = 3k , c l = 1000pf, one transmitter switching, mbaud = v cc kbps 1000 maximum data rate r_in to r_out, c l = 150pf | t phl - t plh | , mbaud = v cc ns 25 transmitter skew | t phl - t plh | ns 50 receiver skew 630 v/? 430 t phl t plh c l = 150pf to 2500pf, mbaud = gnd c l = 150pf to 1000pf mbaud = gnd v cc = 3.3v, r l = 3 to 7k , +3v to -3v or -3v to +3v, t a = +25? transition-region slew rate mbaud = v cc 24 150 note 2: max3222/MAX3232/max3241: c1?4 = 0.1? tested at 3.3v ?0%; c1 = 0.047?, c2?4 = 0.33? tested at 5.0v ?0%. max3237: c1?4 = 0.1? tested at 3.3v ?%; c1?4 = 0.22? tested at 3.3v ?0%; c1 = 0.047?, c2?4 = 0.33? tested at 5.0v ?0%. note 3: transmitter input hysteresis is typically 250mv.
max3222/MAX3232/max3237/max3241 3.0v to 5.5v, low-power, up to 1mbps, true rs-232 transceivers using four 0.1? external capacitors _______________________________________________________________________________________ 5 -7.5 -5.0 -2.5 0 2.5 5.0 7.5 0 max3241 transmitter output voltage vs. load capacitance max3222-04 load capacitance (pf) transmitter output voltage (v) 2000 3000 1000 4000 5000 v out + 1 transmitter at 235kbps 2 transmitters at 30kbps v out - all outputs loaded with 3k w +c l 0.1 m f charge-pump capacitors for all data rates up to 235kbps 4 6 8 10 12 14 16 18 20 22 24 0 max3241 slew rate vs. load capacitance max3222-05 load capacitance (pf) slew rate (v/ m s) 2000 3000 1000 4000 5000 +slew -slew 0 5 10 15 20 25 30 35 45 40 0 max3241 supply current vs. load capacitance when transmitting data max3222-06 load capacitance (pf) supply current (ma) 2000 3000 1000 4000 5000 235kbps 120kbps 20kbps -7.5 -5.0 -2.5 0 2.5 5.0 7.5 0 max3237 transmitter output voltage vs. load capacitance (mbaud = gnd) max3222-07 load capacitance (pf) transmitter output voltage (v) 2000 3000 1000 4000 5000 1 transmitter at 240kbps 4 transmitters at 15kbps 3k w + c l loads v cc = 3.3v 0 10 20 30 50 40 60 70 0 max3237 slew rate vs. load capacitance (mbaud = v cc ) max3222-10 load capacitance (pf) slew rate (v/ m s) 500 1000 1500 2000 -slew, 1mbps +slew, 1mbps 1 transmitter at full data rate 4 transmitters at 1/16 data rate 3k w + c l load each output v cc = 3.3v -slew, 2mbps +slew, 2mbps -7.5 -5.0 -2.5 0 2.5 5.0 7.5 0 max3237 transmitter output voltage vs. load capacitance (mbaud = v cc ) max3222-08 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 w + c l load, each output v cc = 3.3v 2mbps 1.5mbps 1mbps 2mbps 1mbps 1.5mbps 0 10 20 30 40 50 60 0 max3237 supply current vs. load capacitance (mbaud = gnd) max3222-11 load capacitance (pf) supply current (ma) 2000 3000 1000 4000 5000 240kbps 120kbps 20kbps 1 transmitter at full data rate 4 transmitters at 1/16 data rate 3k w + c l loads v cc = 3.3v 0 2 4 6 8 10 12 0 max3237 slew rate vs. load capacitance (mbaud = gnd) max3222-09 load capacitance (pf) slew rate (v/ m s) 2000 3000 1000 4000 5000 +slew -slew 1 transmitter at 240kbps 4 transmitters at 15kbps 3k w + c l loads v cc = 3.3v 0 10 30 20 40 50 60 70 0 max3237 skew vs. load capacitance (t plh - t phl ) max3222-12 load capacitance (pf) 1000 1500 500 2000 2500 max min average; 10 parts skew (ns) 1 transmitter at 512kbps 4 transmitters at 32kbps 3k w + c l loads v cc = 3.3v mbaud = v cc _____________________________typical operating characteristics (continued) (v cc = +3.3v, 235kbps data rate, 0.1? capacitors, all transmitters loaded with 3k , t a = +25?, unless otherwise noted.)
max3222/MAX3232/max3237/max3241 3.0v to 5.5v, low-power, up to 1mbps, true rs-232 transceivers using four 0.1? external capacitors 6 _______________________________________________________________________________________ function max3222 noninverting complementary receiver outputs. always active. dip/so ssop 11, 14 1 1 receiver enable. active low. 2 2 positive terminal of voltage-doubler charge-pump capacitor 6 6 negative terminal of inverting charge-pump capacitor 5 5 positive terminal of inverting charge-pump capacitor 4 4 negative terminal of voltage-doubler charge-pump capacitor 3 3 +5.5v generated by the charge pump 11, 12 12, 13 ttl/cmos transmitter inputs 10, 13 10, 15 ttl/cmos receiver outputs 9, 14 9, 16 rs-232 receiver inputs 8, 15 8, 17 rs-232 transmitter outputs 7 7 -5.5v generated by the charge pump 18 20 shutdown control. active low. 17 19 +3.0v to +5.5v supply voltage 16 18 ground no connection max3237 MAX3232 16 13 1 28 5 3 4 1 3 25 2 27 10, 11 17, 19, 22, 23, 24 9, 12 18, 20, 21 8, 13 8, 9, 11 7, 14 5, 6, 7, 10, 12 6 4 14 16 26 15 2 name en c1+ c2- c2+ c1- v+ t_in r_out r_in t_out v- shdn v cc gnd r_outb n.c. max3241 20, 21 23 28 2 1 24 27 12, 13, 14 15?9 4? 9, 10, 11 3 22 26 25 pin megabaud control input. connect to gnd for normal operation; connect to v cc for 1mbps transmission rates. 15 mbaud ______________________________________________________________pin description
max3222/MAX3232/max3237/max3241 3.0v to 5.5v, low-power, up to 1mbps, true rs-232 transceivers using four 0.1? external capacitors _______________________________________________________________________________________ 7 _______________detailed description dual charge-pump voltage converter the max3222/MAX3232/max3237/max3241? 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), regardless of the input voltage (v cc ) over the 3.0v to 5.5v range. the charge pumps operate in a discontinuous mode; if the output voltages are less than 5.5v, the charge pumps are enabled, and if the output voltages exceed 5.5v, the charge pumps are disabled. each charge pump requires a flying capacitor (c1, c2) and a reservoir capacitor (c3, c4) to generate the v+ and v- supplies. rs-232 transmitters the transmitters are inverting level translators that con- vert cmos-logic levels to 5.0v eia/tia-232 levels. the max3222/MAX3232/max3241 transmitters guaran- tee a 120kbps data rate with worst-case loads of 3k in parallel with 1000pf, providing compatibility with pc-to- pc communication software (such as laplink). typically, these three devices can operate at data rates of 235kbps. transmitters can be paralleled to drive multi- ple receivers or mice. the max3222/max3237/max3241? output stage is turned off (high impedance) when the device is in shut- down mode. when the power is off, the max3222/ MAX3232/max3237/max3241 permit the outputs to be driven up to ?2v. the transmitter inputs do not have pull-up resistors. connect unused inputs to gnd or v cc . max3237 megabaud operation in normal operating mode (mbaud = gnd), the max3237 transmitters guarantee a 250kbps data rate with worst-case loads of 3k in parallel with 1000pf. this provides compatibility with pc-to-pc communica- tion software, such as laplink. for higher speed serial communications, the max3237 features megabaud operation. in megabaud operating mode (mbaud = v cc ), the max3237 transmitters guar- antee a 1mbps data rate with worst-case loads of 3k in parallel with 250pf for 3.0v < v cc < 4.5v. for 5v ?0% operation, the max3237 transmitters guarantee a 1mbps data rate into worst-case loads of 3k in parallel with 1000pf. max3222 MAX3232 max3237 max3241 5k r_ in r_ out en * c2- c2+ c1- c1+ v- v+ v cc c4 c3 c1 c2 0.1 m f v cc shdn * t_ out t_ in gnd v cc 0v 7k 150pf max3222 MAX3232 max3237 max3241 5k r_ in r_ out en * c2- c2+ c1- c1+ v- v+ v cc c4 c3 c1 c2 0.1 m f v cc shdn * t_ out t_ in gnd v cc 0v 3k 2500pf minimum slew-rate test circuit maximum slew-rate test circuit * max3222/max3241 only figure 1. slew-rate test circuits laplink is a trademark of traveling software.
max3222/MAX3232/max3237/max3241 3.0v to 5.5v, low-power, up to 1mbps, true rs-232 transceivers using four 0.1? external capacitors 8 _______________________________________________________________________________________ rs-232 receivers the receivers convert rs-232 signals to cmos-logic out- put levels. the max3222/max3237/max3241 receivers have inverting three-state outputs. in shutdown, the receivers can be active or inactive (table 1). the complementary outputs on the max3237 (r1outb) and the max3241 (r1outb, r2outb) are always active, regardless of the state of en or shdn . this allows for ring indicator applications without forward biasing other devices connected to the receiver outputs. this is ideal for systems where v cc is set to 0v in shutdown to accommodate peripherals, such as uarts (figure 2). max3222/max3237/max3241 shutdown mode supply current falls to less than 1? in shutdown mode ( shdn = low). when shut down, the device? charge pumps are turned off, v+ is pulled down to v cc , v- is pulled to ground, and the transmitter outputs are dis- abled (high impedance). the time required to exit shut- down is typically 100?, as shown in figure 3. connect shdn to v cc if the shutdown mode is not used. shdn has no effect on r_out or r_outb. max3222/max3237/max3241 enable control the inverting receiver outputs (r_out) are put into a high-impedance state when en is high. the complemen- tary outputs r1outb and r2outb are always active, regardless of the state of en and shdn (table 1). en has no effect on t_out. __________applications information capacitor selection the capacitor type used for c1?4 is not critical for proper operation; polarized or nonpolarized capacitors can be used. the charge pump requires 0.1? capaci- tors for 3.3v operation. for other supply voltages, refer to table 2 for required capacitor values. do not use values 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 con- sumption. c2, c3, and c4 can be increased without changing c1? value. however, do not increase c1 with- out also increasing the values of c2, c3, and c4, to maintain the proper ratios (c1 to the other capacitors). when using the minimum required capacitor values, make sure the capacitor value does not degrade exces- sively with temperature. if in doubt, use capacitors with a larger nominal value. the capacitor? equivalent series resistance (esr), which usually rises at low tempera- tures, influences the amount of ripple on v+ and v-. max3237 max3241 t1out r1outb tx 5k uart v cc t1in logic transition detector r1in r1out en = v cc shdn = gnd v cc to m 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 max3237/max3241: 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 figure 2. detection of rs-232 activity when the uart and interface are shut down; comparison of max3237/max3241 (b) with previous transceivers (a).
max3222/MAX3232/max3237/max3241 3.0v to 5.5v, low-power, up to 1mbps, true rs-232 transceivers using four 0.1? external capacitors _______________________________________________________________________________________ 9 power-supply decoupling in most circumstances, a 0.1? bypass capacitor is adequate. in applications that are sensitive to power- supply noise, decouple v cc to ground with a capacitor of the same value as charge-pump capacitor c1. connect bypass capacitors as close to the ic as possible. operation down to 2.7v transmitter outputs will meet eia/tia-562 levels of ?.7v with supply voltages as low as 2.7v. transmitter outputs when exiting shutdown figure 3 shows two transmitter outputs when exiting shutdown mode. as they become active, the two trans- mitter outputs are shown going to opposite rs-232 lev- els (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 max3241 has been specifically designed to power serial mice while operating from low-voltage power sup- plies. it has been tested with leading mouse brands from manufacturers such as microsoft and logitech. the max3241 successfully drove all serial mice tested and met their respective current and voltage requirements. figure 4a shows the transmitter output voltages under increasing load current at 3.0v. figure 4b shows a typical mouse connection using the max3241. table 1. max3222/max3237/max3241 shutdown and enable control truth table table 2. required minimum capacitor values 5v/div v cc = 3.3v c1?4 = 0.1 m f 2v/div t2 50 m s/div t1 figure 3. transmitter outputs when exiting shutdown or powering up v cc (v) c1 (?) 4.5 to 5.5 0.047 3.0 to 5.5 0.1 c2, c3, c4 (?) max3222/MAX3232/max3241 0.33 0.47 1 active 0 1 active 1 shdn high-z 1 0 high-z 0 0 t_out en high-z active high-z active r_out r_outb (max3237/ max3241) active active active active 3.0 to 3.6 0.22 3.15 to 3.6 0.1 max3237 0.22 0.1 4.5 to 5.5 0.047 3.0 to 5.5 0.22 0.33 1.0 3.0 to 3.6 0.1 0.1
max3222/MAX3232/max3237/max3241 3.0v to 5.5v, low-power, up to 1mbps, true rs-232 transceivers using four 0.1? external capacitors 10 ______________________________________________________________________________________ max3241 en 23 r5out 15 r4out 16 r3out 17 r2out 18 r1out 19 r2outb 20 r1outb 21 5k 5k 5k 5k 5k r5in 8 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 c 1 c 2 0.1 m f v cc = 3v to 5.5v 26 r3in figure 4b. mouse driver test circuit -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 01234567 max3222-04 load current per transmitter (ma) transmitter output voltage (v) v out + v cc = 3.0v v out - v out + v cc v out - t1 t2 t3 figure 4a. max3241 transmitter output voltage vs. load current per transmitter
max3222/MAX3232/max3237/max3241 3.0v to 5.5v, low-power, up to 1mbps, true rs-232 transceivers using four 0.1? external capacitors ______________________________________________________________________________________ 11 high data rates the max3222/MAX3232/max3241 maintain the rs-232 ?.0v minimum transmitter output voltage even at high data rates. figure 5 shows a transmitter loopback test circuit. figure 6 shows a loopback test result at 120kbps, and figure 7 shows the same test at 235kbps. for figure 6, all transmitters were driven simultaneously at 120kbps into rs-232 loads in parallel with 1000pf. for figure 7, a single transmitter was driven at 235kbps, and all transmitters were loaded with an rs-232 receiver in parallel with 1000pf. the max3237 maintains the rs-232 ?.0v minimum transmitter output voltage at data rates up to 1mbps. figure 8 shows a loopback test result at 1mbps with mbaud = v cc . for figure 8, all transmitters were loaded with an rs-232 receiver in parallel with 250pf. max3222 MAX3232 max3237 max3241 5k r_ in r_ out en * c2- c2+ c1- c1+ v- v+ v cc c4 c3 c1 c2 0.1 m f v cc shdn * t_ out t_ in gnd v cc 0v 1000pf * max3222/max3241 only t1in r1out v cc = 3.3v t1out 5v/div 5v/div 5v/div 5 m s/div figure 5. loopback test circuit figure 6. max3241 loopback test result at 120kbps t1in r1out v cc = 3.3v t1out 5v/div 5v/div 2 m s/div 5v/div figure 7. max3241 loopback test result at 235kbps +5v 0v +5v 0v -5v +5v 0v t_in t_out = r_in 5k + 250pf r_out 150pf 200ns/div v cc = 3.3v figure 8. max3237 loopback test result at 1000kbps (mbaud = v cc )
max3222/MAX3232/max3237/max3241 3.0v to 5.5v, low-power, up to 1mbps, true rs-232 transceivers using four 0.1? external capacitors 12 ______________________________________________________________________________________ __________________________________________________typical operating circuits max3222 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 m f c2 0.1 m f 0.1 m f +3.3v rs-232 inputs ttl/cmos outputs 5k 5k en shdn c3 * 0.1 m f c4 0.1 m f pin numbers refer to dip/so packages. * c3 can be returned to either v cc or ground. MAX3232 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 m f 16 0.1 m f 0.1 m f 0.1 m f +3.3v rs-232 inputs ttl/cmos outputs c3 * 0.1 m f 5k 5k * c3 can be returned to either v cc or ground. see table 2 for capacitor selection interconnection with 3v and 5v logic the max3222/MAX3232/max3237/max3241 can directly interface with various 5v logic families, includ- ing act and hct cmos. see table 3 for more informa- tion on possible combinations of interconnections. table 3. logic-family compatibility with various supply voltages compatible with act and hct cmos, and with ttl. incompatible with ac, hc, and cd4000 cmos. 3.3 5 system power- supply voltage (v) compatible with all ttl and cmos-logic families. 5 5 compatible with all cmos families. 3.3 3.3 compatibility max32_ _ v cc supply voltage (v)
max3222/MAX3232/max3237/max3241 3.0v to 5.5v, low-power, up to 1mbps, true rs-232 transceivers using four 0.1? external capacitors ______________________________________________________________________________________ 13 _____________________________________typical operating circuits (continued) max3241 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 m f c3 * 0.1 m f 0.1 m f 0.1 m f 0.1 m f +3.3v 26 max3237 en 13 r3out 18 r2out 20 r1out 21 r1outb 16 logic outputs 5k 5k 5k * c3 can be returned to either v cc or ground. 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 m f 0.1 m f 0.1 m f 0.1 m f 0.1 m f 26 mbaud 15 t5in 17 t4in 19 t5out 12 t4out 10 shdn 14 t4 t5
max3222/MAX3232/max3237/max3241 3.0v to 5.5v, low-power, up to 1mbps, true rs-232 transceivers using four 0.1? external capacitors 14 ______________________________________________________________________________________ _____________________________________________pin configurations (continued) 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+ MAX3232 r1out t1in t2in r2out r2in t2out v- c2- dip/so top view 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 ssop n.c. n.c. max3222 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 max3237 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+ so/ssop max3241
max3222/MAX3232/max3237/max3241 3.0v to 5.5v, low-power, up to 1mbps, true rs-232 transceivers using four 0.1? external capacitors ______________________________________________________________________________________ 15 ______3v-powered eia/tia-232 and eia/tia-562 transceivers from maxim _ordering information (continued) * dice are tested at t a = +25?, dc parameters only. 0.1? capacitors, 1 complemen- tary receiver, megabaud operation 232 250/1000 3 5/3 3.0 to 5.5 max3237 0.1? capacitors, autoshutdown, complementary receiver, drives mice 232 120 1 3/5 3.0 to 5.5 max3243 0.1? capacitors 232 120 n/a 2/2 3.0 to 5.5 MAX3232 0.1? capacitors, autoshutdown 232 120 2 2/2 3.0 to 5.5 max3223 0.1? capacitors 232 120 2 2/2 3.0 to 5.5 max3222 232 562 232 562 232 eia/ tia-232 or 562 2.7 to 3.6 autoshutdown, complementary receiver, drives mice, transient detection 235 5 3/5 max3212 0.1? capacitors 230 2 2/2 3.0 to 3.6 max563 operates directly from batteries without a voltage regulator 120 2 2/2 1.8 to 4.25 max218 no. of receivers active in shutdown power- supply voltage (v) wide supply range 230 5 3/5 2.7 to 5.25 max562 drives mice 120 5 3/5 3.0 to 3.6 max212 features guar- anteed data rate (kbps) no. of transmitters/ receivers part 0.1? capacitors, 2 complemen- tary receivers, drives mice 232 120 5 3/5 3.0 to 5.5 max3241 part max3222c/d max3222epn max3222ewn -40? to +85? -40? to +85? 0? to +70? temp. range pin-package dice* 18 plastic dip 18 so max3222eap MAX3232 cpe MAX3232cse 0? to +70? 0? to +70? -40? to +85? 20 ssop 16 plastic dip 16 narrow so MAX3232cwe MAX3232epe MAX3232ese -40? to +85? -40? to +85? 0? to +70? 16 wide so 16 plastic dip 16 narrow so MAX3232ewe max3237 cai max3237eai -40? to +85? 0? to +70? -40? to +85? 16 wide so 28 ssop 28 ssop max3241 cwi 0? to +70? 28 so max3241cai max3241ewi max3241eai -40? to +85? -40? to +85? 0? to +70? 28 ssop 28 so 28 ssop
maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circuit patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. 16 __________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 (408) 737-7600 1996 maxim integrated products printed usa is a registered trademark of maxim integrated products. max3222/MAX3232/max3237/max3241 3.0v to 5.5v, low-power, up to 1mbps, true rs-232 transceivers using four 0.1? external capacitors ___________________chip topography ___________________chip information ________________________________________________________package information t1in t2in 0.127" (3.225mm) 0.087" (2.209mm) r2out r2in t2out r1out r1in t1out v cc v+ c1+ shdn en c1- c2+ c2- v- gnd max3222 transistor count: 339 substrate connected to gnd l dim a a1 b c d e e h l a dim d d d d d min 0.068 0.002 0.010 0.004 0.205 0.301 0.025 0? min 0.239 0.239 0.278 0.317 0.397 max 0.078 0.008 0.015 0.008 0.209 0.311 0.037 8? max 0.249 0.249 0.289 0.328 0.407 min 1.73 0.05 0.25 0.09 5.20 7.65 0.63 0? min 6.07 6.07 7.07 8.07 10.07 max 1.99 0.21 0.38 0.20 5.38 7.90 0.95 8? pins 14 16 20 24 28 max 6.33 6.33 7.33 8.33 10.33 inches inches millimeters millimeters a ssop shrink small-outline package h e d a a1 c b 0.65 bsc 0.0256 bsc 21-0056a e see variations max3222 339 MAX3232 339 max3237 1212 max3241 894 transistor count part

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