Datasheet

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MAX3222/MAX3232/

MAX3237/MAX3241*

3.0V to 5.5V, Low-Power, up to 1Mbps, True RS-232

Transceivers Using Four 0.1µF External Capacitors

EVALUATION KIT AVAILABLE

For pricing, delivery, and ordering information, please contact Maxim Direct at

1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.

19-0273; Rev 7; 1/07

________________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 0.1µF 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 1µA 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 1µA 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 1µA 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

completely removed.

The MAX3222, MAX3232, and MAX3241 are available

in space-saving TSSOP and SSOP packages.

________________________Applications

Notebook, Subnotebook, and Palmtop Computers

High-Speed Modems

Battery-Powered Equipment

Hand-Held Equipment

Peripherals

Printers

__Next Generation Device Features

o For Smaller Packaging:

MAX3228E/MAX3229E: +2.5V to +5.5V RS-232

Transceivers in UCSP™

o For Integrated ESD Protection:

MAX3222E/MAX3232E/MAX3237E/MAX3241E*/

MAX3246E: ±15kV ESD-Protected, Down to 10nA,

3.0V to 5.5V, Up to 1Mbps, True RS-232

Transceivers

o For Low-Voltage or Data Cable Applications:

MAX3380E/MAX3381E: +2.35V to +5.5V, 1µA,

2Tx/2Rx RS-232 Transceivers with ±15kV

ESD-Protected I/O and Logic Pins

SHDN

GND

T1OUT

C1-

V+

C1+

TOP VIEW

R1IN

R1OUT

T1IN

T2IN

T2OUT

V-

C2-

C2+

R2OUTR2IN

DIP/SO

MAX3222

_________________Pin Configurations

_______________Ordering Information

MegaBaud and UCSP are trademarks 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 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.

Denotes lead-free package.

PART TEMP RANGE PIN-PACKAGE

PKG

CODE

MAX3222CUP+ 0°C to +70°C 20 TSSOP U20+2

MAX3222CAP+ 0°C to +70°C 20 SSOP A20+1

MAX3222CWN+ 0°C to +70°C 18 SO W18+1

MAX3222CPN+ 0°C to +70°C 18 Plastic Dip P18+5

Summary of content (17 pages)

PAGE 1
EVALUATION KIT AVAILABLE MAX3222/MAX3232/ MAX3237/MAX3241* 3.0V to 5.5V, Low-Power, up to 1Mbps, True RS-232 Transceivers Using Four 0.1µF External Capacitors ________________General Description __Next Generation Device Features The MAX3222/MAX3232/MAX3237/MAX3241 transceivers have a proprietary low-dropout transmitter output 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 0.1µF external chargepump capacitors.
PAGE 2
MAX3222/MAX3232/MAX3237/MAX3241 3.0V to 5.5V, Low-Power, up to 1Mbps, True RS-232 Transceivers Using Four 0.1µF External Capacitors ABSOLUTE MAXIMUM RATINGS Continuous Power Dissipation (TA = +70°C) 16-Pin TSSOP (derate 6.7mW/°C above +70°C).............533mW 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 Plastic DIP (derate 10.53mW/°C above +70°C)...842mW 18-Pin SO (derate 9.52mW/°C above +70°C)..............
PAGE 3
MAX3222/MAX3232/MAX3237/MAX3241 3.0V to 5.5V, Low-Power, up to 1Mbps, True RS-232 Transceivers Using Four 0.1µF External Capacitors ELECTRICAL CHARACTERISTICS (continued) (VCC = +3.0V to +5.5V, C1–C4 = 0.1µF (Note 2), TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER CONDITIONS MIN Input Hysteresis Input Resistance TYP MAX UNITS 7 kΩ 0.3 TA = +25°C 3 5 V TRANSMITTER OUTPUTS Output Voltage Swing All transmitter outputs loaded with 3kΩ to ground ±5.0 ±5.
PAGE 4
MAX3222/MAX3232/MAX3237/MAX3241 3.0V to 5.5V, Low-Power, up to 1Mbps, True RS-232 Transceivers Using Four 0.1µF External Capacitors TIMING CHARACTERISTICS—MAX3237 (VCC = +3.0V to +5.5V, C1–C4 = 0.1µF (Note 2), TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER CONDITIONS Maximum Data Rate MIN RL = 3kΩ, CL = 1000pF, one transmitter switching, MBAUD = GND 250 VCC = 3.0V to 4.5V, RL = 3kΩ, CL = 250pF, one transmitter switching, MBAUD = VCC 1000 VCC = 4.5V to 5.
PAGE 5
MAX3222/MAX3232/MAX3237/MAX3241 3.0V to 5.5V, Low-Power, up to 1Mbps, True RS-232 Transceivers Using Four 0.1µF External Capacitors _____________________________Typical Operating Characteristics (continued) (VCC = +3.3V, 235kbps data rate, 0.1µF capacitors, all transmitters loaded with 3kΩ, TA = +25°C, unless otherwise noted.) MAX3241 SLEW RATE vs. LOAD CAPACITANCE MAX3222-05 VOUT+ 22 5.0 1 TRANSMITTER AT 235kbps 2 TRANSMITTERS AT 30kbps 0 -2.5 18 -SLEW 16 14 12 +SLEW 10 VOUT- -5.
PAGE 6
MAX3222/MAX3232/MAX3237/MAX3241 3.0V to 5.5V, Low-Power, up to 1Mbps, True RS-232 Transceivers Using Four 0.1µF External Capacitors ______________________________________________________________Pin Description PIN NAME MAX3222 6 MAX3232 MAX3237 MAX3241 FUNCTION DIP/SO SSOP 1 1 — 13 23 EN 2 2 1 28 28 C1+ 3 3 2 27 27 V+ +5.
PAGE 7
MAX3222/MAX3232/MAX3237/MAX3241 3.0V to 5.5V, Low-Power, up to 1Mbps, True RS-232 Transceivers Using Four 0.1µF 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.
PAGE 8
MAX3222/MAX3232/MAX3237/MAX3241 3.0V to 5.5V, Low-Power, up to 1Mbps, True RS-232 Transceivers Using Four 0.1µF External Capacitors RS-232 Receivers The receivers convert RS-232 signals to CMOS-logic output 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.
PAGE 9
MAX3222/MAX3232/MAX3237/MAX3241 3.0V to 5.5V, Low-Power, up to 1Mbps, True RS-232 Transceivers Using Four 0.1µF External Capacitors Table 1. MAX3222/MAX3237/MAX3241 Shutdown and Enable Control Truth Table R_OUT R_OUTB (MAX3237/ MAX3241) High-Z Active Active Operation Down to 2.7V High-Z High-Z Active Active Active Active High-Z Active Active Transmitter outputs will meet EIA/TIA-562 levels of ±3.7V with supply voltages as low as 2.7V. SHDN EN T_OUT 0 0 0 1 1 1 0 1 Table 2.
PAGE 10
MAX3222/MAX3232/MAX3237/MAX3241 3.0V to 5.5V, Low-Power, up to 1Mbps, True RS-232 Transceivers Using Four 0.1µF External Capacitors MAX3222-04 TRANSMITTER OUTPUT VOLTAGE (V) 6 5 4 3 VOUT+ VCC = 3.0V 2 1 T1 0 -1 T2 VOUT+ -2 -3 VCC VOUT- T3 VOUT- -4 -5 -6 0 1 2 3 4 5 6 7 LOAD CURRENT PER TRANSMITTER (mA) Figure 4a. MAX3241 Transmitter Output Voltage vs. Load Current per Transmitter VCC = 3V to 5.5V 28 C1 C2 C1+ 24 C1- 1 C2+ 2 0.
PAGE 11
MAX3222/MAX3232/MAX3237/MAX3241 3.0V to 5.5V, Low-Power, up to 1Mbps, True RS-232 Transceivers Using Four 0.1µF External Capacitors VCC T1IN 5V/div T1OUT 5V/div R1OUT 5V/div 0.1μF VCC C1+ V+ C3 C1 C1C2+ C2 C2- MAX3222 MAX3232 MAX3237 MAX3241 VC4 5μs/div VCC = 3.3V T_ OUT T_ IN Figure 6. MAX3241 Loopback Test Result at 120kbps R_ IN R_ OUT EN* 0V SHDN* VCC 5kΩ 1000pF T1IN 5V/div T1OUT 5V/div R1OUT 5V/div GND *MAX3222/MAX3237/MAX3241 ONLY Figure 5.
PAGE 12
MAX3222/MAX3232/MAX3237/MAX3241 3.0V to 5.5V, Low-Power, up to 1Mbps, True RS-232 Transceivers Using Four 0.1µF External Capacitors Interconnection with 3V and 5V Logic The MAX3222/MAX3232/MAX3237/MAX3241 can directly interface with various 5V logic families, including ACT and HCT CMOS. See Table 3 for more information on possible combinations of interconnections. Table 3. Logic-Family Compatibility with Various Supply Voltages SYSTEM POWERSUPPLY VOLTAGE (V) MAX32_ _ VCC SUPPLY VOLTAGE (V) 3.3 3.
PAGE 13
MAX3222/MAX3232/MAX3237/MAX3241 3.0V to 5.5V, Low-Power, up to 1Mbps, True RS-232 Transceivers Using Four 0.1µF External Capacitors _____________________________________Typical Operating Circuits (continued) 0.1μF +3.3V 26 28 C1+ 0.1μF VCC 27 28 C1+ V+ 0.1μF 0.1μF 3 MAX3237 22 T3IN LOGIC INPUTS V- 4 1 0.1μF 0.1μF C2- 23 T2IN 27 V+ C3* 0.1μF 24 C1- C2+ 24 T1IN VCC 0.1μF 25 C11 26 0.
PAGE 14
MAX3222/MAX3232/MAX3237/MAX3241 3.0V to 5.5V, Low-Power, up to 1Mbps, True RS-232 Transceivers Using Four 0.1µF External Capacitors _____________________________________________Pin Configurations (continued) TOP VIEW + EN 1 20 SHDN C1+ 2 19 VCC C1+ 1 V+ 3 18 GND V+ 2 C1- 4 17 T1OUT C1- 3 C2+ 5 16 R1IN C2+ 4 15 R1OUT C2- 5 MAX3222 C2- 6 + 16 VCC 15 GND 14 T1OUT MAX3232 13 R1IN 12 R1OUT V- 7 14 N.C.
PAGE 15
MAX3222/MAX3232/MAX3237/MAX3241 3.0V to 5.5V, Low-Power, up to 1Mbps, True RS-232 Transceivers Using Four 0.
PAGE 16
MAX3222/MAX3232/MAX3237/MAX3241 3.0V to 5.5V, Low-Power, up to 1Mbps, True RS-232 Transceivers Using Four 0.1µF External Capacitors ___________________Chip Topography ___________________Chip Information MAX3222 V+ C1+ EN SHDN V CC PART TRANSISTOR COUNT MAX3222 339 MAX3232 339 MAX3237 1212 MAX3241 894 GND C1C2+ T1OUT 0.127" (3.225mm) C2- R1IN VR1OUT T2OUT R2IN R2OUT T2IN T1IN 0.087" (2.
PAGE 17
MAX3222/MAX3232/MAX3237/MAX3241 3.0V to 5.5V, Low-Power, up to 1Mbps, True RS-232 Transceivers Using Four 0.1µF External Capacitors Package Information TSSOP4.40mm.EPS For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status.