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3.0v to 5.5v, low-power, up to 1mbps, true rs-232 t ransceivers using four 0.1f exter nal capacitors 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 0.1f 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 1a 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 1a 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 1a 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 tssop and ssop packages. featur es ? low supply current: 300a (max3222/MAX3232/max3241) 500a (max3237) ? guaranteed data rate: 120kbps (max3222/MAX3232/max3241) 250kbps (max3237?normal operation) 1mbps (max3237?megabaud operation) ? 1a 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/s (max3222/MAX3232/max3237/max3241) 24v/s (max3237?megabaud operation) ordering infor mation part temp. range pin-package max3222 cup 0c to +70c 20 tssop max3222cap 0c to +70c 20 ssop max3222cwn 0c to +70c 18 so max3222cpn 0c to +70c 18 plastic dip ordering information continued at end of data sheet. pin configurations top view applications notebook, subnotebook, and palmtop computers high-speed modems battery-powered equipment hand-held equipment peripherals printers en 1 c1+ 2 v+ 3 c1- 4 c2+ 5 c2- 6 v- 7 t2out 8 r2in 9 max3222 18 shdn 17 v cc 16 gnd 15 t1out 14 r1in 13 r1out 12 t1in 11 t2in 10 r2out tiger electronic co.,ltd
v cc = 5.0v parameter conditions min typ max units dc characteristics v cc power-supply current no load, v cc = 3.3v or 5.0v, t a = +25c max3222/MAX3232/ max3241 0.3 1.0 ma max3237 0.5 2.0 shutdown supply current shdn = gnd, t a = +25c 1.0 10 a logic inputs and receiv r outputs input logic threshold low (note 3) t_in, en, shdn, mbaud 0.8 v input logic threshold high (note 3) v cc = 3.3v 2.0 v v cc = 5.0v 2.4 input leakage current t_in, en, shdn, mbaud 0.01 1.0 a output leakage current receivers disabled 0.05 10 a output voltage low i out = 1.6ma 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 input threshold low t a = +25c v cc = 3.3v 0.6 1.2 v v cc = 5.0v 0.8 1.5 input threshold high v cc = 3.3v 1.5 2.4 v v cc = 5.0v 1.8 2.4 absolute maximum ratings 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 .................................................................................25v output voltages t_out ...........................................................................13.2v r_out ....................................................-0.3v to (v cc + 0.3v) short-circuit duration t_out ....................................................................continuous continuous power dissipation (t a = +70c) 16-pin plastic dip (derate 10.53mw/c above +70c) ... 842mw 16-pin narrow so (derate 8.70mw/c above +70 c) .... 696mw 16-pin wide so (derate 9.52mw/c above +70 c) ........ 762mw 16-pin tssop (derate 6.7mw/c above +70 c) ............. 533mw 18-pin plastic dip (derate 11.11mw/c above +70c) .. 889mw 18-pin so (derate 9.52mw/c above +70c) ..............762mw 20-pin ssop (derate 8.00mw/c above +70c) .........640mw 20-pin tssop (derate 7.0mw/c above +70 c) ............. 559mw 28-pin so (derate 12.50mw/c above +70c) .....................1w 28-pin ssop (derate 9.52mw/c above +70c) .........762mw 28-pin tssop (derate 8.7mw/c above +70 c) .............696mw operating temperature ranges max32_ _c_ _ .....................................................0c to +70c max32_ _e_ _ .................................................-40c to +85c storage temperature range .............................-65c to +150c lead temperature (soldering, 10sec) .............................+300c note 1: v+ and v- can have a maximum magnitude of 7v, but their absolute difference cannot exceed 13v. stresses beyond those listed under ?absolute 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. electrical characteristics (v cc = +3.0v to +5.5v, c1?c4 = 0.1f (note 2), t a = t min to t max , unless otherwise noted. typical values are at t a = +25c.) t a = +25c
electrical characteristics (continued) (v cc = +3.0v to +5.5v, c1?c4 = 0.1f (note 2), t a = t min to t max , unless otherwise noted. typical values are at t a = +25c.) parameter conditions min typ max units input hysteresis 0.3 v input resistance t a = +25c 3 5 7 k & output voltage swing all transmitter outputs loaded with 3k & to ground 5.0 5.4 v output resistance v cc = v+ = v- = 0v, t out = 2v 300 10m & output short-circuit current 35 60 ma output leakage current v out = 12v, v cc = 0v or 3v to 5.5v, transmitters disabled 25 a mouse driveability (max 3 241) transmitter output voltage t1in = t2in = gnd, t3in = v cc , t3out loaded with 3k & to gnd, t1out and t2out loaded with 2.5ma each 5.0 v timing characteristics?max 3222/MAX3232/max3241 (v cc = +3.0v to +5.5v, c1?c4 = 0.1f (note 2), t a = t min to t max , unless otherwise noted. typical values are at t a = +25c.) parameter conditions min typ max units maximum data rate r l = 3k & , c l = 1000pf, one transmitter switching 120 235 kbps receiver propagation delay r_in to r_out, c l = 150pf t phl 0.3 s t plh 0.3 receiver output enable time normal operation 200 ns receiver output disable time normal operation 200 ns transmitter skew | t phl - t plh | 300 ns receiver skew | t phl - t plh | 300 ns transition-region slew rate v cc = 3.3v, r l = 3 & to 7k & , +3v to -3v or -3v to +3v, t a = +25c c l = 150pf to 1000pf 6 30 v/s c l = 150pf to 2500pf 4 30
235kbps 120kbps transmitter output voltage max3222-01 slew rate (v/ max3222-02 supply current (ma ) max3222-03 timing characteristics?max3237 (v cc = +3.0v to +5.5v, c1?c4 = 0.1f (note 2), t a = t min to t max , unless otherwise noted. typical values are at t a = +25c.) parameter conditions min typ max units maximum data rate r l = 3k & , c l = 1000pf, one transmitter switching, mbaud = gnd 250 kbps 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 1000 receiver propagation delay r_in to r_out, c l = 150pf t phl 0.15 s t plh 0.15 receiver output enable time normal operation 200 ns receiver output disable time normal operation 200 ns transmitter skew | t phl - t plh | , mbaud = gnd 100 ns | t phl - t plh | , mbaud = v cc 25 ns receiver skew | t phl - t plh | 50 ns transition-region slew rate v cc = 3.3v, r l = 3 & to 7k & , +3v to -3v or -3v to +3v, t a = +25c c l = 150pf to 1000pf mbaud = gnd 6 30 v/s mbaud = v cc 24 150 c l = 150pf to 2500pf, mbaud = gnd 4 30 note 2: max3222/MAX3232/max3241: c1?c4 = 0.1f tested at 3.3v 10%; c1 = 0.047f, c2?c4 = 0.33f tested at 5.0v 10%. max3237: c1?c4 = 0.1f tested at 3.3v 5%; c1?c4 = 0.22f tested at 3.3v 10%; c1 = 0.047f, c2?c4 = 0.33f tested at 5.0v 10%. note 3: transmitter input hysteresis is typically 250mv. typical operating characteristics (v cc = +3.3v, 235kbps data rate, 0.1f capacitors, all transmitters loaded with 3k , t a = +25c, unless otherwise noted.) max3222/MAX3232 transmitter output voltage vs. load capacitance 6 5 v out + 4 3 1 0 -1 -2 -3 -4 v out - -5 -6 max3222/MAX3232 slew rate vs. load capacitance 22 20 for data rates up to 235kbps 18 16 14 -slew 12 10 8 +slew 6 2 0 max3222/MAX3232 supply current vs. load capacitance when transmitting data 40 35 30 25 20 15 10 5 0 0 1000 2000 3000 4000 5000 150 1000 2000 3000 4000 5000 0 1000 2000 3000 4000 5000 load capacitance (pf) load capacitance (pf) load capacitance (pf)
all outputs loaded with 3k +c l 0.1 f charge-pump capacitors for all data rates up to 235kbps -slew +slew transmitter output voltage transmitter output voltage slew rate (v/ max3222-10 max3222-07 max3222-04 transmitter output voltage supply current (ma ) slew rate (v/ max3222-08 max3222-05 max3222-11 supply current (ma ) slew rate (v/ skew max3222-12 max3222-09 max3222-06 operating characteristics (continued) (v cc = +3.3v, 235kbps data rate, 0.1f capacitors, all transmitters loaded with 3k , t a = +25c, unless otherwise noted.) 7.5 5.0 2.5 0 -2.5 -5.0 -7.5 max3241 transmitter output voltage vs. load capacitance v out + 1 transmitter at 235kbps 2 transmitters at 30kbps v out - max3241 slew rate vs. load capacitance 24 22 20 18 16 14 12 10 8 6 4 max3241 supply current vs. load capacitance when transmitting data 45 235kbps 40 35 30 120kbps 25 20 20kbps 15 10 5 0 0 1000 2000 3000 4000 5000 0 1000 2000 3000 4000 5000 0 1000 2000 3000 4000 5000 7.5 5.0 2.5 0 -2.5 -5.0 -7.5 load capacitance (pf) max3237 transmitter output voltage vs. load capacitance (mbaud = gnd) 1 transmitter at 240kbps 4 transmitters at 15kbps 3k + c l loads v cc = 3.3v 7.5 5.0 2.5 0 -2.5 -5.0 -7.5 load capacitance (pf) max3237 transmitter output voltage vs. load capacitance (mbaud = v cc ) 1mbps 2mbps 1.5mbps 1 transmitter at full data rate 4 transmitters at 1/16 data rate 3k + c l load, each output v cc = 3.3v 1mbps load capacitance (pf) max3237 slew rate vs. load capacitance (mbaud = gnd) 12 10 -slew 8 6 4 4 transmitters at 15kbps 2 3k + c l loads 0 0 1000 2000 3000 4000 5000 0 500 1000 1500 2000 0 1000 2000 3000 4000 5000 load capacitance (pf) max3237 slew rate vs. load capacitance (mbaud = v cc ) load capacitance (pf) max3237 supply current vs. load capacitance (mbaud = gnd) load capacitance (pf) max3237 skew vs. load capacitance (t plh - t phl ) 60 50 -slew, 1mbps 50 +slew, 1mbps -slew, 2mbps 40 40 +slew, 2mbps 30 20 240kbps 120kbps 20kbps 1 transmitter at 512kbps 60 4 transmitters at 32kbps 3k + c l loads v cc = 3.3v 50 mbaud = v cc 40 max average; 10 parts 30 20 1 transmitter at full data rate 3k + c l load each output 0 v cc = 3.3v 1 transmitter at full data rate 20 4 transmitters at 1/16 data rate v cc = 3.3v 0 0 min 0 500 1000 1500 2000 0 1000 2000 3000 4000 5000 0 500 1000 1500 2000 2500 load capacitance (pf) load capacitance (pf) load capacitance (pf)
pin description pin name function max3222 MAX3232 max3237 max3241 dip/so ssop 1 1 ? 13 23 en receiver enable. active low. 2 2 1 28 28 c1+ positive terminal of voltage-doubler charge-pump capacitor 3 3 2 27 27 v+ +5.5v generated by the charge pump 4 4 3 25 24 c1- negative terminal of voltage-doubler charge-pump capacitor 5 5 4 1 1 c2+ positive terminal of inverting charge-pump capacitor 6 6 5 3 2 c2- negative terminal of inverting charge-pump capacitor 7 7 6 4 3 v- -5.5v generated by the charge pump 8, 15 8, 17 7, 14 5, 6, 7, 10, 12 9, 10, 11 t_out rs-232 transmitter outputs 9, 14 9, 16 8, 13 8, 9, 11 4?8 r_in rs-232 receiver inputs 10, 13 10, 15 9, 12 18, 20, 21 15?19 r_out ttl/cmos receiver outputs 11, 12 12, 13 10, 11 17, 19, 22, 23, 24 12, 13, 14 t_in ttl/cmos transmitter inputs 16 18 15 2 25 gnd ground 17 19 16 26 26 v cc +3.0v to +5.5v supply voltage 18 20 ? 14 22 shdn shutdown control. active low. ? 11, 14 ? ? ? 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 r_outb noninverting complementary receiver outputs. always active.
detailed description dual charge-pump voltage converter the max3222/MAX3232/max3237/max3241?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), 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 device s can operate at data rates of 235kbps. transmitters can be para lleled to drive multi- ple receivers or mice. the max3222/max3237/max3241?s 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 12v. 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 10% operation, the max3237 transmitters guarantee a 1mbps data rate into worst-case loads of 3k in parallel with 1000pf. v cc 0.1 f v cc 0.1 f c1+ c1 c1- c2+ c2 c2- t_ in v cc max3222 MAX3232 max3237 max3241 v+ c3 v- c4 t_ out c1+ c1 c1- c2+ c2 c2- t_ in v cc max3222 MAX3232 max3237 max3241 v+ c3 v- c4 t_ out 0v v cc r_ out en * shdn * gnd r_ in 5k 3k 2500pf 0v v cc r_ out en * shdn * gnd r_ in 5k 7k 150pf * max3222/max3241 only minimum slew-rate test circuit maximum slew-rate test circuit figure 1. slew-rate test circuits
v cc rx protection diode uart tx gnd v cc shdn = gnd previous rs-232 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 receiv er outputs. this is ideal for systems where v cc is set to 0v in shutdown to accommodate peripherals, such as uarts (figure 2). 5k max3222/max3237/max3241 shutdown mode supply current falls to less than 1a in shutdown mode (shdn = low). when shut down, the device?s 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- a) older rs-232: powered-down uart draws current from active receiver output in shutdown. v cc down is typically 100s, 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 v cc to logic p transition detector rx r1outb r1out max3237 max3241 r1in 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 infor mation 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- protection diode uart tx gnd en = v cc t1in shdn = gnd 5k t1out tors for 3.3v operation. for other supply voltages, refer to table 2 for required capacitor values. do not use values lower than those listed in table 2. increasing the capaci- tor values (e.g., by a factor of 2) reduces ripple on the transmitter outputs and slightly reduces power consump- tion. 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, and c4, to maintain the b) new max3237/max3241: en shuts down receiver outputs (except for b outputs), so no current flows to uart in shutdo wn. b outputs indicate receiver activity during shutdown with en high. figure 2. detection of rs-232 activity when the uart and interface are shut down; comparison of max3237/max3241 (b) with previous transceivers (a). proper ratios (c1 to the other capacitors). when using the minimum required capacitor values, make sure the capacitor valu e does not degrade exces- sively with temperature. if in doubt, use capacitors with a higher nominal value. the capacitor?s equivalent series resistance (esr), which usually rises at low tempera- tures, influences the amount of ripple on v+ and v-.
v cc (v) c1 (f) c2, c3, c4 (f) max3222/MAX3232/max3241 3.0 to 3.6 0.1 0.1 4.5 to 5.5 0.047 0.33 3.0 to 5.5 0.1 0.47 max3237 3.0 to 3.6 0.22 0.22 3.15 to 3.6 0.1 0.1 4.5 to 5.5 0.047 0.33 3.0 to 5.5 0.22 1.0 table 1. max3222/max3237/max3241 shutdown and enable control truth table s hdn e n t_out r_out r_outb (max3237/ max3241) 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. required minimum capacitor values power-supply decoupling in most circumstances, a 0.1f 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 3.7v 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. 5v/div t2 2v/div t1 v cc = 3.3v c1?c4 = 0.1 f 50 s/div figure 3. transmitter outputs when exiting shutdown or powering up
transmitter output voltage max3222-04 6 5 4 3 v cc = 3.0v 2 1 t1 0 -1 t2 -2 v out + v out + -3 v cc t3 -4 -5 -6 v out - v out - 0 1 2 3 4 5 6 7 load current per transmitter (ma) figure 4a. max3241 transmitter output voltage vs. load current per transmitter v cc = 3v to 5.5v 0.1 f 26 c 1 c 2 v cc 28 c1+ 24 c1- 1 c2+ 2 c2- 14 t1in 13 t2in 12 t3in 21 r1outb 20 r2outb 19 r1out v cc max3241 27 v+ c3 3 v- c4 t1out 9 t2out 10 t3out 11 r1in 4 computer serial port +v +v -v gnd tx 18 r2out 5k r2in 5 17 r3out 5k r3in 6 16 r4out 15 r5out 5k r4in 7 5k r5in 8 mouse 23 en gnd 25 5k shdn 22 figure 4b. mouse driver test circuit
v cc 0.1 f t1in 5v/div c1+ c1 c1- c2+ c2 c2- t_ in v cc max3222 MAX3232 max3237 max3241 v+ c3 v- c4 t_ out t1out r1out v cc = 3.3v 5 s/div 5v/div 5v/div figure 6. max3241 loopback test result at 120kbps 0v v cc r_ out en * shdn * gnd r_ in 5k 1000pf t1in t1out 5v/div 5v/div * max3222/max3241 only figure 5. loopback test circuit r1out v cc = 3.3v 2 s/div 5v/div high data rates the max3222/MAX3232/max3241 maintain the rs-232 5.0v 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 figure 7. max3241 loopback test result at 235kbps +5v 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 5.0v minimum transmitter output voltage at data rates up to 1mbps. figure 8 shows a loopback te st result at 1mbps with mbaud = v cc . for figure 8, all transmitters were loaded with an rs-232 receiver in parallel with 250pf. 0v +5v 0v -5v +5v 0v v cc = 3.3v 200ns/div t_in t_out = r_in 5k + 250pf r_out 150pf figure 8. max3237 loopback test result at 1000kbps (mbaud = v cc )
system power- supply voltage (v) max32_ _ v cc supply voltage (v) compatibility 3.3 3.3 compatible with all cmos families. 5 5 compatible with all ttl and cmos-logic families. 5 3.3 compatible with act and hct cmos, and with ttl. incompatible with ac, hc, and cd4000 cmos. interconnection with 3v and 5v logic the max3222/MAX3232/max3237/max3241 can directly interface with variou s 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 typical operating cir cuits +3.3v 0.1 f c1 0.1 f c2 0.1 f 2 c1+ 4 c1- 5 c2+ 6 c2- 12 t1in 17 v cc max3222 3 v+ 7 v- t1out 15 c3 * 0.1 f c4 0.1 f +3.3v 0.1 f 0.1 f 0.1 f 1 c1+ 3 c1- 4 c2+ 5 c2- 11 t1in 16 v cc MAX3232 2 v+ 6 v- t1out 14 c3 * 0.1 f c4 0.1 f ttl/cmos inputs 11 t2in t2out 8 rs-232 outputs ttl/cmos inputs 10 t2in t2out 7 rs-232 outputs ttl/cmos outputs 13 r1out 10 r2out r1in 14 5k r2in 9 rs-232 inputs ttl/cmos outputs 12 r1out 9 r2out r1in 13 5k r2in 8 rs-232 inputs 1 en gnd 16 5k 18 shdn 5k gnd 15 pin numbers refer to dip/so packages. * c3 can be returned to either v cc or ground. * c3 can be returned to either v cc or ground. see table 2 for capacitor selection
operating cir cuits (continued) 0.1 f 0.1 f 28 c1+ 25 c1- 26 v cc 0.1 f 27 v+ +3.3v 0.1 f 0.1 f 28 24 c1+ c1- 26 v cc 27 v+ c3 * 0.1 f 0.1 f logic inputs 1 c2+ 3 c2- 24 t1in 23 t2in 22 t3in 19 t4in 17 t5in 16 r1outb max3237 t1 t2 t3 t4 t5 4 v- t1out 5 t2out 6 t3out 7 t4out 10 t5out 12 0.1 f rs-232 outputs 0.1 f ttl/cmos inputs 1 c2+ 2 c2- 14 t1in 13 t2in 12 t3in 21 r1outb 20 r2outb 19 r1out max3241 3 v- t1out 9 t2out 10 t3out 11 r1in 4 c4 0.1 f rs-232 outputs logic outputs 21 r1out 20 r2out 18 r3out r1 r1in 8 5k r2 r2in 9 5k r3 r3in 11 5k rs-232 inputs ttl/cmos outputs 18 r2out 17 r3out 16 r4out 15 r5out 5k r2in 5 5k r3in 6 5k r4in 7 5k r5in 8 rs-232 inputs 13 en gnd 2 mbaud 15 14 shdn 23 en gnd 25 5k shdn 22 * c3 can be returned to either v cc or ground. * c3 can be returned to either v cc or ground.
pin configurations (continued) top view en 1 c1+ 2 v+ 3 c1- 4 c2+ 5 c2- 6 v- 7 t2out 8 r2in 9 max3222 20 shdn 19 v cc 18 gnd 17 t1out 16 r1in 15 r1out 14 n.c. 13 t1in 12 t2in c1+ 1 v+ 2 c1- 3 c2+ 4 c2- 5 v- 6 t2out 7 r2in 8 MAX3232 16 v cc 15 gnd 14 t1out 13 r1in 12 r1out 11 t1in 10 t2in 9 r2out r2out 10 11 ssop/tssop n.c. dip/so/tssop c2+ 1 28 c1+ c2+ 1 28 c1+ gnd 2 c2- 3 v- 4 t1out 5 27 v+ 26 v cc 25 c1- 24 t1in c2- 2 v- 3 r1in 4 r2in 5 27 v+ 26 v cc 25 gnd 24 c1- max3237 max3241 t2out 6 23 t2in r3in 6 23 en t3out 7 r1in 8 r2in 9 t4out 10 r3in 11 t5out 12 en 13 shdn 14 22 t3in 21 r1out 20 r2out 19 t4in 18 r3out 17 t5in 16 r1outb 15 mbaud r4in 7 r5in 8 t1out 9 t2out 10 t3out 11 t3in 12 t2in 13 t1in 14 22 shdn 21 r1outb 20 r2outb 19 r1out 18 r2out 17 r3out 16 r4out 15 r5out ssop so/ssop/tssop
part temp. range pin-package max3222eup -40c to +85c 20 tssop max3222eap -40c to +85c 20 ssop max3222ewn -40c to +85c 18 so max3222epn -40c to +85c 18 plastic dip max3222c/d 0c to +70c dice* MAX3232 cue 0c to +70c 16 tssop MAX3232cse 0c to +70c 16 narrow so MAX3232cwe 0c to +70c 16 wide so MAX3232cpe 0c to +70c 16 plastic dip MAX3232eue -40c to +85c 16 tssop MAX3232ese -40c to +85c 16 narrow so ordering infor mation (continued) part temp. range pin-package MAX3232ewe -40c to +85c 16 wide so MAX3232epe -40c to +85c 16 plastic dip max3237 cai 0c to +70c 28 ssop max3237eai -40c to +85c 28 ssop max3241 cui 0c to +70c 28 tssop max3241cai 0c to +70c 28 ssop max3241cwi 0c to +70c 28 so max3241eui -40c to +85c 28 tssop max3241eai -40c to +85c 28 ssop max3241ewi -40c to +85c 28 so * dice are tested at t a = +25c, dc parameters only. 3v-powered eia/tia-232 and eia/tia-562 transceivers part power- supply voltage (v) no. of transmitters/ receivers no. of receivers active in shutdown guar- anteed data rate (kbps) eia/ tia-232 or 562 features max212 3.0 to 3.6 3/5 5 120 232 drives mice max218 1.8 to 4.25 2/2 2 120 232 operates directly from batteries without a voltage regulator max562 2.7 to 5.25 3/5 5 230 562 wide supply range max563 3.0 to 3.6 2/2 2 230 562 0.1f capacitors max3212 2.7 to 3.6 3/5 5 235 232 autoshutdown, complementary receiver, drives mice, transient detection max3222 3.0 to 5.5 2/2 2 120 232 0.1f capacitors max3223 3.0 to 5.5 2/2 2 120 232 0.1f capacitors, autoshutdown MAX3232 3.0 to 5.5 2/2 n/a 120 232 0.1f capacitors max3237 3.0 to 5.5 5/3 3 250/1000 232 0.1f capacitors, 1 complemen- tary receiver, megabaud operation max3241 3.0 to 5.5 3/5 5 120 232 0.1f capacitors, 2 complemen- tary receivers, drives mice max3243 3.0 to 5.5 3/5 1 120 232 0.1f capacitors, autoshutdown, complementary receiver, drives mice
package infor mation

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