MAX3237ECAI

Overview

The MAX3237ECAI is a true RS-232 transceiver manufactured by Analog Devices/Maxim Integrated, housed in a 28-pin SSOP package. It operates on a single +3.0V to +5.5V supply and features five drivers and three receivers for full-duplex communication. The device supports data rates up to 250kbps normally and 1Mbps in MegaBaud mode. Shutdown supply current reaches as low as 10nA. It includes ±15kV ESD protection on all pins and requires four 0.1μF external capacitors.

Feature Summary

• Integrated dual charge pump enables true RS-232 performance from a single low-voltage supply using only four small external capacitors.
• MegaBaud operating mode allows transmission at 1Mbps while maintaining compliant output levels under specified load conditions.
• Enhanced electrostatic discharge protection covers all logic and RS-32 I/O pins to withstand high static events without latchup.
• Ultra-low power shutdown mode reduces supply current significantly while keeping receiver inputs active for peripheral monitoring.

Applications

• Peripheral applications requiring fast data transfer with multiple serial lines
• Battery-powered portable equipment and handheld devices
• Notebook, subnotebook, and palmtop computers
• Cell-phone data cables and ISDN terminal adaptors

Procurement Notes

Verify the specific suffix 'CAI' against official manufacturer documentation to confirm lead-free status and temperature range. Confirm pinout compatibility with existing designs, as ordering suffixes may indicate variations in packaging or compliance that do not alter electrical function unless explicitly stated in datasheets.

Selection Notes

Select this component when designing systems requiring five transmitter outputs and three receiver inputs within a compact footprint. It is suitable for mixed voltage environments where a single +3.0V to +5.5V rail must drive standard RS-232 interfaces. Consider the MegaBaud feature if higher throughput is needed without increasing supply voltage.

Part Context

This part belongs to the MAX3237E family of low-power RS-232 transceivers. It shares architectural similarities with the MAX3222E and MAX3241E but offers a distinct driver-to-receiver ratio optimized for peripheral connectivity rather than standard PC ports or complete serial port integration.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided source material. Verify compatibility with legacy parts like the MAX232 only through functional mapping of pinouts and electrical specifications rather than direct cross-reference lists.