19-0273; Rev 7; 1/07
Transceivers Using Four 0.1µF External Capacitors
, Low-Power, up to 1Mbps, True RS-232________________General Description
__Next Generation Device Features
The MAX3222/MAX3232/MAX3237/MAX3241 trans-ceivers have a proprietary low-dropout transmitter out- For Smaller Packaging:
MAX3228E/MAX3229E: +2.5V to +5.5V RS-232put stage enabling true RS-232 performance from aTransceivers in UCSP
3.0V to 5.5V supply with a dual charge pump. Thedevices require only four small 0.1µF external charge- For Integrated ESD Protection:
pump capacitors. The MAX3222, MAX3232, andMAX3222E/MAX3232E/MAX3237E/MAX3241E*/MAX3241 are guaranteed to run at data rates ofMAX3246E: ±15kV ESD-Protected, Down to 10nA,120kbps while maintaining RS-232 output levels. The3.0V to 5.5V, Up to 1Mbps, True RS-232MAX3237 is guaranteed to run at data rates of 250kbpsTransceivers
in the normal operating mode and 1Mbps in the For Low-Voltage or Data Cable Applications:MegaBaud operating mode, while maintaining RS-232MAX3380E/MAX3381E: +2.35V to +5.5V, 1µA, output levels.
2 Tx/2 Rx RS-232 Transceivers with ±15kV ESD-Protected I/O and Logic Pins
The MAX3222/MAX3232 have 2 receivers and 2 drivers. The MAX3222 features a 1µA shutdown modethat reduces power consumption and extends batterylife in portable systems. Its receivers remain active inshutdown mode, allowing external devices such asmodems to be monitored using only 1µA supply cur-rent. The MAX3222 and MAX3232 are pin, package,and functionally compatible with the industry-standardMAX242 and MAX232, respectively.
The MAX3241 is a complete serial port (3 drivers/5 receivers) designed for notebook and subnotebookcomputers. The MAX3237 (5 drivers/3 receivers) is idealfor fast modem applications. Both these devices featurea shutdown mode in which all receivers can remain+Denotes lead-free package.
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 extraoutputs are always active, allowing external devicesOrdering Information continued at end of data sheet.
such as a modem to be monitored without forward bias-ing the protection diodes in circuitry that may have VCCcompletely removed.
The MAX3222, MAX3237, and MAX3241 are availablein space-saving TSSOP and SSOP packages.
________________________Applications
Notebook, Subnotebook, and Palmtop ComputersHigh-Speed ModemsBattery-Powered EquipmentHand-Held EquipmentPeripheralsPrinters
Typical Operating Circuits appear at end of data sheet.
*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 pricing, delivery, and ordering information,please contact Maxim/Dallas Direct!at 1-888-629-4642, or visit Maxim’s website at http://www.77cn.com.cn.
MAX3222/MAX3232/MAX3237/MAX3241*