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MAXIM MAX3222/3232/3237/3241 Manual(1)

1. MAX3222 MAX3232 MAX3222 MAX3232 MAX3222 MAX3232 TRANSMITTER OUTPUT VOLTAGE SLEW RATE SUPPLY CURRENT vs LOAD CAPACITANCE vs LOAD CAPACITANCE vs LOAD CAPACITANCE WHEN TRANSMITTING DATA 6 5 3 40 8 2 i T H 4 235kbps 3 _ 30 2 2 a 25 E 5 120kbps 5 d 20 E a gt 45 2 a 20kbps 3 10 4 5 5 6 0 0 1000 2000 3000 4000 5000 150 1000 2000 3000 4000 5000 0 1000 2000 3000 4000 5000 LOAD CAPACITANCE pF LOAD pF LOAD CAPACITANCE pF JAM Fir 3 0V to 5 5V Low Power up to 1Mbps True RS 232 Transceivers Using Four 0 1 External Capacitors MAX3241 TRANSMITTER OUTPUT VOLTAGE vs LOAD CAPACITANCE TRANSMITTER OUTPUT VOLTAGE V o 0 1000 2000 3000 4000 5000 LOAD CAPACITANCE pF MAX3237 TRANSMITTER OUTPUT VOLTAGE vs LOAD CAPACITANCE MBAUD GND 5 0 75 5 HM 50 25 5 1 TRANSMITTER AT 240kbps 4 TRANSMITTERS AT 15kbps 5 0 Q LOADS Voc 3 3V 7 5 0 1000 2000 3000 4000 5000 LOAD CAPACITANCE pF MAX3237 SLEW RATE vs LOAD CAPACITANCE MBAUD Vcc MAX3222 10 SLEW RATE T 1 TRANSMITTER AT FULL DATA RATE 4 TRANSMITTERS AT 1 16 DATA RATE LOAD EACH OUTPUT 3 3V 0 500 1000 1500 2000 LOAD CAPACITANCE pF MAXIM SLEW
2. Figure 5 Loopback Test Circuit 2us div Figure 7 MAX3241 Loopback Test Result at 235kbps 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 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 transmitter output voltage at data rates up to 1Mbps Figure 8 shows a loopback test result at 1Mbps with MBAUD Vcc For Figure 8 all transmitters were 200ns div loaded with an RS 232 receiver in parallel with 250pF Vcc 3 3V Figure 8 MAX3237 Loopback Test Result at 1000kbps MBAUD Vcc For Figure 7 a single transmitter was driven at 235kbps b v AUN AS T OUT R IN and all transmitters were loaded with an RS 232 receiver ES 5k 250 in parallel with 1000pF DE The MAX3237 maintains the RS 232 5 0V minimum on ENE EA 150pF MAKIM ItcEXVW Z CEXVW CECEXVW CCCEXVIA MAX3222 MAX3232 MAX3237 MAX3241 3 0V to 5 5V Low Power up to 1Mbps True RS 232 Transceivers Using Four O 1uF External Capacitors Interconnection with 3V and 5V Logic Table 3 Logic Family Compatibility The MAX3222 MAX3232 MAX3237 MAX3241 can with Various Supply Voltages directly inter
3. WARES RAGA BAER ARMA 19 0273 Rev 5 3 99 MAKINI 3 0V to 5 5V Low Power up to 1Mbps True RS 232 Transceivers Using Four 0 1uF External Capacitors General Description Features The MAX3222 MAX3232 MAX3237 MAX3241 trans Low Supply Current ceivers have a proprietary low dropout transmitter out 300p A MAX3222 MAX3232 MAX3241 put stage enabling true RS 232 performance from a 500p A MAX3237 3 0V to 5 5V supply with a dual charge pump The Guaranteed Data Rate devices require only four small 0 1uF external charge 120kbps MAX3222 MAX3232 MAX3241 pump capacitors The MAX3222 MAX3232 and 250kbps MAX3237 Normal Operation MAX3241 are guaranteed to run at data rates of 1Mbps MAX3237 MegaBaud Operation 120kbps while maintaining RS 232 output levels The 1A Low Power Shutdown with Receivers Active MAX3237 is guaranteed to run at data rates of 250kbps MAX3222 MAX3237 MAX3241 in the normal operating mode and 1Mbps in the MegaBaud operating mode while maintaining RS 232 Flow Through Pinout MAX3237 output levels Meets EIA TIA 232 Specifications Down to 3 0V The MAX3222 MAX3232 have 2 receivers and 2 Guaranteed Mouse Driveability MAX3241 drivers The MAX3222 features a 1 shutdown mode Pin Compatible with Industry Standard 232 that reduces power consumption and extends battery MAX3232 life in portable systems Its receivers remain active in Pin Compatible with I
4. TRANSMITTER OUTPUT VOLTAGE V SUPPLY CURRENT mA Typical Operating Characteristics continued Vcc 3 3V 235kbps data rate 0 1uF capacitors all transmitters loaded with TA 25 C unless otherwise noted MAX3241 SLEW RATE vs LOAD CAPACITANCE 222 05 SLEW SLEW 0 1000 2000 3000 4000 5000 LOAD CAPACITANCE pF MAX3237 TRANSMITTER OUTPUT VOLTAGE vs LOAD CAPACITANCE MBAUD Vcc 222 08 2Mbps 1 5Mbps 1 TRANSMITTER AT FULL DATA RATE 4 TRANSMITTERS AT 1 16 DATA RATE 0 500 1000 1500 2000 LOAD CAPACITANCE pP MAX3237 SUPPLY CURRENT vs LOAD CAPACITANCE MBAUD GND MAX3222 11 1 TRANSMITTER AT FULL DATA RATE 4 TRANSMITTERS AT 1 16 DATA RATE 0 1000 2000 3000 4000 5000 LOAD CAPACITANCE pF MAX3241 SUPPLY CURRENT vs LOAD CAPACITANCE WHEN TRANSMITTING DATA 235kb E 40 9 E j 30 120kbps T 25 B 2 7 20kb amp 15 is B 10 5 0 0 1000 2000 3000 4000 5000 LOAD CAPACITANCE pF MAX3237 SLEW RATE vs LOAD CAPACITANCE MBAUD GND 12 g 10 Z s amp 6 a an 4 2 0 0 1000 2000 3000 4000 5000 LOAD CAPACITANCE pF MAX3237 SKEW vs LOAD CAPACITANCE tPLH tPHL 70 1 TRANSMITTER 5
5. PARAMETER CONDITIONS MIN TYP MAX UNITS DC CHARACTERISTICS No load 3 3V or 5 0V MAX3222 MAX3232 0 3 1 0 Vcc Power Supply Current TA 25 WM MAX3241 mA MAX3237 0 5 2 0 Shutdown Supply Current SHDN GND TA 25 1 0 10 LOGIC INPUTS AND RECEIVER OUTPUTS ien a Threshold Low IN EN SHDN MBAUD 0 8 V Input Logic Threshold High Voc 3 3V 2 0 V Note 3 Voc 5 0V 2 4 Input Leakage Current T IN EN SHDN MBAUD 0 01 10 Output Leakage Current Receivers disabled 0 05 10 Output Voltage Low lout 1 6mA 0 4 V Output Voltage High louT 1 0mA Vcc 0 6 Vcc 0 1 V RECEIVER INPUTS Input Voltage Range 25 25 V Voc 3 3V 0 6 1 2 Input Threshold Low TA 25 C V Voc 5 0V 0 8 1 5 Voc 3 3V 1 5 2 4 Input Threshold High 25 V 5 0V 1 8 2 4 2 AVLAZCLAVI 3 0V to 5 5V Low Power up to 1Mbps True RS 232 Transceivers Using Four 0 1 External Capacitors ELECTRICAL CHARACTERISTICS continued Vcc 3 0V to 5 5V 1 4 0 1 Note 2 TMIN to TMAX unless otherwise noted Typical values are at TA 25 C PARAMETER CONDITIONS MIN TYP MAX UNITS Input Hysteresis 0 3 V Input Resistance 25 3 5 7 kQ TRANSMITTER OUTPUTS Output Voltage Swing All transmitter outputs loaded with 3kQ to ground 5 0 5 4 V Output Resistance Vcc V V OV 2V 300 10M Q Output Short Circuit Current 35 60 mA
6. 2500pF MAX3222 MAX3241 ONLY MINIMUM SLEW RATE TEST CIRCUIT Figure 1 Slew Rate Test Circuits AVLAZCLAVI 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 Vcc MAX3237 MegaBaud Operation In normal operating mode MBAUD GND the MAX3237 transmitters guarantee a 250kbps data rate with worst case loads of 3kQ 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 Vcc the MAX3237 transmitters guar antee a 1Mbps data rate with worst case loads of 3kQ in parallel with 250pF for 3 0V lt Vcc lt 4 5V For 5V 10 operation the MAX3237 transmitters guarantee a 1Mbps data rate into worst case loads of 3kQ in parallel with 1000pF MAXIMUM SLEW RATE TEST CIRCUIT ItcEXVW Z CEXVW CECEXVW CCCEXVIA MAX3222 MAX3232 MAX3237 MAX3241 3 0V to 5 5V Low Power up to 1Mbps True RS 232 Transceivers Using Four O 1uF External Capacitors PREVIOUS RS 232 PROTECTION DIODE UART SHDN GND OLDER RS 232 POWERED DOWN UART DRAWS CU
7. SUBSTRATE CONNECTED TO GND Package Information N a eae COMMON DIMENSIUNS 100 X 4 MILLIMETERS INCHE o AF MIN MAX MIN MAX TA Sea n n A 110 043 E IT LE I T E al oos 015 002 006 A 085 0 95 033 037 H b 019 0 30 007 012 bi 019 0 25 100 c 0 090 0 20 0035 008 3 c 0 090 01 0035 0 D SEE VARIATIONS SEE_VARIATIONS 169 0 65 BSC 1026 BSC H 625 650 246 256 055 070 020 028 U U N SEE VARIATIONS VARIATIONS ly 285 315 112 124 VIEV 0 8 LJEDEC VARIATIONS MO 153 N MILLIMETERS INCHES te 14 D f AC 16 D 16 0 E 0 20 SEATING zl AD EP e0 D D PLANE DETAIL A x AE 24 D SIDE VIEW ND VIEW EIN AF EP D X 025 othr PARTING ITH PLATING LINE N f uean me neran LL w L bi BASE METAL 1 NOTES y 1 DIMENSIONS D AND E DO NOT INCLUDE FLASH VI LA K VI 2 MOLD FLASH OR PROTRUSIONS TD EXCEED 15 mm PER SIDE pd qud 3 CONTROLLING DIMENSION MILLIMETER ue 4 MEETS JEDEC DUTLINE MO 153 VARIATIONS AB AC
8. 5V Low Power up to 1Mbps True RS 232 Transceivers Using Four O 1uF External Capacitors 14 MAX3222 SSOP TSSOP MAXIM MAX3237 TOP VIEW Pin Configurations continued MAXIM MAX3232 DIP SO TSSOP MAXIM MAX3241 SO SSOP TSSOP MAXIM 3 0V to 5 5V Low Power up to 1Mbps True RS 232 Transceivers Using Four O 1uF External Capacitors Ordering Information continued PART TEMP RANGE PIN PACKAGE PART TEMP RANGE PIN PACKAGE MAX3222EUP 40 C to 85 C 20 TSSOP MAX3232EWE 40 C to 85 C 16 Wide SO MAX3222EAP 40 C to 85 C 20 SSOP MAX3232EPE 40 C to 85 C 16 Plastic DIP MAX3222EWN 40 C to 85 18 SO MAX3237CAI 0 to 70 28 SSOP MAX3222EPN 40 C to 85 C 18 Plastic DIP MAX3237EAI 40 C to 85 C 28 SSOP MAX3222C D 0 C to 70 C Dice MAX3241CUI 0 C to 70 C 28 TSSOP MAX3232CUE 0 C to 70 C 16 TSSOP MAX3241 CAI 0 C to 70 C 28 SSOP MAX3232CSE 0 C to 70 C 16 Narrow SO MAX3241 CWI 0 C to 70 C 28 SO MAX3232CWE 0 to 70 16 Wide SO MAX3241 EUI 40 C to 85 C 28 TSSOP MAX3232CPE 0 C to 70 C 16 Plastic DIP MAX3241 EAI 40 C to 85 C 28 SSOP MAX3232EUE 40 C to 85 C 16 TSSOP MAX3241 EWI 40 C to 85 C 28 SO MASSESE Dice are tested at TA 25 C DC parameters only 3V Powered EIA TIA 232 and EIA TIA 562 Transceivers from Maxim
9. AD AE 5 DIMENSIONS X AND Y APPLY TD EXPOSED PAD EP VERSIONS ONLY PACKAGE OUTLINE TSSOP 440nn_ BODY 065mm PITCH 6 EXPOSED PAD FLUSH WITH BOTTOM OF PACKAGE WITHIN 002 arava SEARA FRU mv 1 21 0066 C 1 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied 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 1999 Maxim Integrated Products Printed USA MAXIM is a registered trademark of Maxim Integrated Products
10. Output Leakage Current Vcc OV or 3V to 5 5V transmitters 25 uA MOUSE DRIVEABILITY MAX3241 T2IN GND T3IN Vcc Transmitter Output Voltage T3OUT loaded with 3kQ to GND 5 0 V T1OUT and T2OUT loaded with 2 5mA each TIMING CHARACTERISTICS MAX3222 MAX3232 MAX3241 Vcc 3 0V to 5 5V 1 4 0 1 Note 2 TA TMIN to TMAX unless otherwise noted Typical values are at TA 25 C PARAMETER CONDITIONS MIN TYP MAX UNITS Maximum Data Rate RL 1000pF one transmitter switching 120 235 kbps t 0 3 Receiver Propagation Delay IN to R OUT 150pF PME 0 3 Receiver Output Enable Time Normal operation 200 ns Receiver Output Disable Time Normal operation 200 ns Transmitter Skew tPHL tPLH 300 ns Receiver Skew tPHL tPLH 300 ns C 150pF to Voc 3 3V RL 30 to 7kO 1000 6 30 Transition Region Slew Rate 3V to 3V or 3V to 3V V us 25 CL 150pF to 4 30 2500pF MAXIM ItcEXVW Z CEXVW CECEXVW CCCEXVIA MAX3222 MAX3232 MAX3237 MAX3241 3 0V to 5 5V Low Power up to 1Mbps True RS 232 Transceivers Using Four O 1uF External Capacitors TIMING CHARACTERISTICS MAX3237 Vcc 3 0V to 5 5V 1 4 0 147 Note 2 TA Tmin to Tmax unless otherwise noted Typical values are at TA 25 PARAMETER CONDITIONS MIN
11. SHDN has no effect on R OUT or R OUTB MAX3222 MAX3237 MAX3241 Enable Control The inverting receiver outputs OUT are put into a high impedance state when EN is high The complemen tary outputs R OUTB 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 1 4 is not critical for proper operation polarized or nonpolarized capacitors can be used The charge pump requires 0 1uF capaci 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 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 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 higher nominal value The capacitors equivalent series resistance ESR which usually rises at low tempera tures influences the amount of ripple on V and V AVLAZCLAVI 3 0V to 5 5V Low Power up to 1Mbps True RS 232 Transceivers Using Fou
12. 12kbps 4 TRANSMITTERS AT 32kbps LOADS 3 3V 50 MBAUD 40 30 20 0 500 1000 1500 2000 LOAD CAPACITANCE pF 2500 ItcEXVW Z CEXVW CECEXVW CCCEXVIA MAX3222 MAX3232 MAX3237 MAX3241 3 0V to 5 5V Low Power up to 1Mbps True RS 232 Transceivers Using Four O 1uF External Capacitors Pin Description PIN MAX3222 NAME FUNCTION MAX3232 MAX3237 MAX3241 DIP SO SSOP 1 1 13 23 Receiver Enable Active low 2 2 1 28 28 1 Positive Terminal of Voltage Doubler Charge Pump Capacitor 3 3 2 27 27 Ve 5 5 Generated by the Charge Pump 4 4 3 25 24 C1 Negative Terminal of Voltage Doubler Charge Pump Capacitor 5 5 4 1 1 C24 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 E 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 17 19 22 11 12 12 13 10 11 23 24 12 13 14 T IN TTL CMOS Transmitter Inputs 16 18 15 2 25 GND Ground 17 19 16 26 26 Voc 3 0V to 5 5V Supply Voltage 18 20 14 22 Shutdown Control Active low 11 14 No Connection E 2 15 MBAUD MegaBaud Control Input Connect to GND for normal ope
13. GUAR EP No OF B CE VERE ANTEED EIA PART TRANSMITTERS DATA TIA 232 FEATURES VOLTAGE RECEIVERS ACTIVE IN RATE OR 562 V SHUTDOWN kbps 212 3 0 to 3 6 3 5 5 120 232 Drives mice Operates directly from batteries MAX218 1 8 to 4 25 2 2 2 120 232 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 1uF capacitors AutoShutdown complementary MAX3212 2 7 to 3 6 3 5 5 235 232 receiver drives mice transient detection MAX3222 3 0 to 5 5 2 2 2 120 232 0 157 capacitors MAX3223 3 0 to 5 5 2 2 2 120 232 0 152 capacitors AutoShutdown MAX3232 3 0 to 5 5 2 2 N A 120 232 0 157 capacitors 0 157 capacitors 1 complemen MAX3237 3 0 to 5 5 5 3 3 250 1000 232 tary receiver MegaBaud operation MAX3241 3 0 to 5 5 3 5 5 120 232 Orin capacitors 1 tary receivers drives mice 0 1 capacitors AutoShutdown MAX3243 3 0 to 5 5 3 5 1 120 232 complementary receiver drives mice MA MAVMA 35 ItcEXVW Z CEXVW CECEXVW CCCEXVIA MAX3222 MAX3232 MAX3237 MAX3241 3 0V to 5 5V Low Power up to 1Mbps True RS 232 Transceivers Using Four O 1uF External Capacitors Chip Topography Chip Information MAX3222 SHDN PART TRANSISTOR COUNT V 1 EN MAX3222 339 GND MAX3232 339 MAX3237 1212 T10UT MAX3241 894 BI tour 200 R2IN R20UT T2IN T1IN 0 087 2 209mm a TRANSISTOR COUNT 339
14. RRENT FROM ACTIVE RECEIVER OUTPUT IN SHUTDOWN RANSITION ALAXCLAM MAX3237 241 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 Figure 2 Detection of RS 232 Activity when the UART and Interface are Shut Down Comparison of MAX3237 MAX3241 b with Previous Transceivers a 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 Vcc is set to OV 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 s charge pumps are turned off V is pulled down to Vcc V is pulled to ground and the transmitter outputs are dis abled high impedance The time required to exit shut down is typically 1001 as shown in Figure Connect SHDN to Vcc if the shutdown mode is not used
15. TYP MAX UNITS RL 1000pF one transmitter switching 250 MBAUD GND Vcc 3 0V to 4 5V RL CL 250pF Maximum Data Rate one transmitter switching MBAUD 1090 Kbps Vcc 4 5V to 5 5V RL CL 1000pF 1000 one transmitter switching MBAUD tPHL 0 15 Receiver Propagation Delay IN to R OUT 150pF us tPLH 0 15 Receiver Output Enable Time Normal operation 200 ns Receiver Output Disable Time Normal operation 200 ns t MBAUD GND 100 ns Transmitter Skew tPLH tPHL tPLH MBAUD Vcc 25 ns Receiver Skew tPHL 50 ns MBAUD 6 30 CL 150 GND 3 3V RL to 7kQ to 1000pF MBAUD Transition Region Slew Rate 3V to 3V or 3V to 3V 24 150 V us Vcc 25 CL 150pF to 2500pF 4 30 MBAUD GND Note 2 MAX3222 MAX3232 MAX3241 1 4 0 1uF tested at 3 3V 10 C1 0 047yF C2 C4 0 33pF tested at 5 0V 10 MAX3237 1 4 0 1uF tested at 3 3V 596 1 4 0 22yuF tested at 3 3V 10 C1 0 047uF C2 C4 0 33pF tested at 5 0V 10 Note 3 Transmitter input hysteresis is typically 250mV Typical Operating Characteristics Vcc 3 3V 235kbps data rate 0 1uF capacitors all transmitters loaded with TA 25 C unless otherwise noted
16. allel 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 ItcEXVW Z CEXVW CECEXVW CCCEXVIA MAX3222 MAX3232 MAX3237 MAX3241 3 0V to 5 5V Low Power up to 1Mbps True RS 232 Transceivers Using Four O 1uF External Capacitors TRANSMITTER OUTPUT VOLTAGE V 5 MAXIMA MAX3241 v T1OUT 200 Figure 4b Mouse Driver Test Circuit 10 T30UT COMPUTER SERIAL PORT MAXIM 3 0V to 5 5V Low Power up to 1Mbps True RS 232 Transceivers Using Four 0 1 External Capacitors 5V div 5V div 5V div MAXUM MAX3222 MAX3232 MAX3237 MAX3241 1000pF 5V div 5V div MAX3222 MAX3241 ONLY 5V div
17. ered Equipment MAXIM MAX3222 Hand Held Equipment Peripherals Printers DIP SO Pin Configurations continued at end of data sheet Typical Operating Circuits appear at end of data sheet 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 Maxim Integrated Products 1 For free samples amp the latest literature httpz www maxim ic com or phone 1 800 998 8800 For small orders phone 1 800 835 8769 xItc XVW ZE c XVW CECEXVW CCCEXVIA MAX3222 MAX3232 MAX3237 MAX3241 3 0V to 5 5V Low Power up to 1Mbps True RS 232 Transceivers Using Four O 1uF External Capacitors ABSOLUTE MAXIMUM RATINGS M Mu MISI 0 3V to 6V Continuous Power Dissipation TA 70 MENS EMI O 0 3V to 7V 16 Pin Plastic DIP derate 10 53mW C above 70 C 842mW 0 3V to 7V 16 Pin Narrow SO derate 8 70mW C above 70 C 696mW Ve NOTE T oco cerei iere eren EP Pe irr 13V 16 Pin Wide SO derate 9 52mW C above 70 762mW Input Voltages __ 16 Pin TSSOP derate 6 7MW C above 70 533mW TIN SHDN 0 3V to 6V 18 Pin Plastic DIP derate 11 11mW C above 70 889mW 0 3V to Vcc 0 3V 18 Pin SO derate 9 52mW C above 70 C 762mW R IN Masasassensassanenesanansnesana
18. face with various 5V logic families includ ing ACT and HCT CMOS See Table 3 for more informa SYSTEM MAX32 _ tion on possible combinations of interconnections POWER Vcc SUPPLY SUPPLY COMPATIBILITY VOLTAGE VOLTAGE V V Compatible with all CMOS 3 3 33 a families 5 5 Compatible with all TTL and CMOS logic families Compatible with ACT and 5 33 HCT CMOS and with TTL Incompatible with AC HC and CD4000 CMOS Typical Operating Circuits ii Ci MAX3222 MAXIM af co MAX3232 TTL CMOS RS 232 TTL CMOS INPUTS OUTPUTS INPUTS TTL CMOS RS 232 TTL CMOS RS 232 OUTPUTS INPUTS OUTPUTS INPUTS PIN NUMBERS REFER TO DIP SO PACKAGES C3 CAN BE RETURNED TO EITHER OR GROUND C3 BE RETURNED TO EITHER OR GROUND SEE TABLE 2 FOR CAPACITOR SELECTION 12 3 0V to 5 5V Low Power up to 1Mbps True RS 232 Transceivers Using Four 0 1 External Capacitors Typical Operating Circuits continued 00 MAXIM 237 241 TTL CMOS INPUTS OUTPUTS LOGIC T gt 85 232 INPUTS OUTPUTS TTL CMOS OUTPUTS T RS 232 LOGIC INPUTS OUTPUTS CAN BE RETURNED TO EITHER OR GROUND C3 CAN BE RETURNED TO EITHER Vcc OR GROUND MAKIM ItcEXVW Z CEXVW CECEXVW CCCEXVIA MAX3222 MAX3232 MAX3237 MAX3241 3 0V to 5
19. ndustry Standard MAX242 shutdown mode allowing external devices such as MAX3222 modems to be monitored using only supply cur Guaranteed Slew Rate rent The MAX3222 and MAX3232 are pin package and functionally compatible with the industry standard 2 MAXS292 MAKSAS MAXIA MAX242 and MAX232 respectively 24V us MAX3237 MegaBaud Operation The MAX3241 is a complete serial port 3 drivers P P 5 receivers designed for notebook and subnotebook _ Ordering Information computers The MAX3237 5 drivers 3 receivers is ideal PART TEMP RANGE PIN PACKAGE for fast modem applications Both these devices feature MAX3222CUP 0 C to 70 20 TSSOP a shutdown mode in which all receivers can remain active while using only 1A supply current Receivers R1 to LAE 20 SSOP MAX3237 MAX3241 and R2 MAX3241 have extra out MAX3222CWN 0 C to 70 18 50 puts in addition to their standard outputs These extra MAX3222CPN 0 C to 70 C 18 Plastic DIP 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 Vcc completely removed Pin Configurations The MAX3222 MAX3237 and MAX3241 are available in space saving TSSOP and SSOP packages Ordering Information continued at end of data sheet TOP VIEW Applications Notebook Subnotebook and Palmtop Computers High Speed Modems Battery Pow
20. nssasanasusasacnensnsenensuasanssesanssasasasuensae 25V 20 Pin SSOP derate 8 00mW C above 70 ER ER 640mW QUE S i 13 2 20 Pin TSSOP derate 7 0mW C above 70 559mW Hour vvv 0 3V to Veo 0 3v 28 Pin SO derate 12 50mW C above 70 1W Short Circuit Duration 7 28 SSOP derate 9 52mW C above 70 762mW elle Continuous 28 Pin TSSOP derate 8 7mW C above 70 0 696mW Operating Temperature Ranges 2 uae eso rero deni 0 C to 70 2 40 to 85 Storage Temperature 65 to 150 Lead Temperature soldering 10sec 300 Note 1 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 Vcc 3 0V to 5 5V 1 4 0 1 Note 2 TMIN to TMAX unless otherwise noted Typical values are at TA 25 C
21. r 0 1 External Capacitors Table 1 MAX3222 MAX3237 MAX3241 Shutdown and Enable Control Truth Table R OUTB SHDN EN T OUT R OUT 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 C1 C2 C3 C4 V uF 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 5V div 2V div Voc 3 3V C1 C4 0 1uF Figure 3 Transmitter Outputs when Exiting Shutdown or Powering Up AVLAZCLAVI Power Supply Decoupling In most circumstances 0 1uF bypass capacitor is adequate In applications that are sensitive to power supply noise decouple Vcc 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 7 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 3kQ in par
22. ration connect to Vcc for 1Mbps transmission rates 16 20 21 R OUTB Noninverting Complementary Receiver Outputs Always active AVLAZCLAVI 3 0V to 5 5V Low Power up to 1Mbps True RS 232 Transceivers Using Four 0 1 External Capacitors 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 VcC 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 3kQ 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 LapLink is a trademark of Traveling Software

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MAXIM MAX3222/3232/3237/3241 Manual(1)

MAXIM MAX3222/3232/3237/3241 Manual(1)

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