MAX3237CAI+

Overview

The MAX3237CAI+ is a true RS-232 transceiver manufactured by Analog Devices Inc./Maxim Integrated. It operates from a single +3.0V to +5.5V supply and features a proprietary low-dropout transmitter output stage with a dual charge pump requiring only four 0.1µF external capacitors. The device contains five drivers and three receivers, supporting data rates up to 250kbps in normal mode and 1Mbps in MegaBaud™ mode. It includes an always-active complementary receiver output (R1OUTB) for monitoring without forward biasing protection diodes. The CAI suffix indicates commercial temperature range operation (0°C to +70°C), while the '+' denotes a lead-free package.

Feature Summary

• Integrated dual charge pump eliminates the need for bipolar ±12V supplies
• Always-on complementary receiver outputs enable external device monitoring during shutdown
• MegaBaud operation supports high-speed serial communications up to 1Mbps

Applications

• Battery-powered equipment
• Hand-held equipment
• Peripherals
• Datacom equipment

Procurement Notes

Verify that the ordering suffix 'CAI' corresponds to the commercial temperature range of 0°C to +70°C and the SSOP-28 package. Confirm the '+' suffix indicates a lead-free compliant package. Ensure the component source matches the specified manufacturer, Analog Devices Inc./Maxim Integrated, as cross-manufacturer listings may indicate different specifications or authenticity concerns.

Selection Notes

Select this component when a single-supply RS-232 interface with five drivers and three receivers is required. It is suitable for applications needing high-speed transmission via MegaBaud mode or low-power consumption through shutdown capabilities. Verify that the system voltage falls within the 3.0V to 5.5V range and that the operating environment stays within the commercial temperature limits defined by the 'C' suffix.

Part Context

The MAX3237 belongs to the MAX3222/MAX3232/MAX3237/MAX3241 family of low-power, true RS-232 transceivers. Unlike the MAX3222 and MAX3232 which feature two drivers and two receivers, the MAX3237 provides five drivers and three receivers. It shares the same low-voltage architecture and capacitor requirements as its siblings but offers higher channel density and specific high-speed operational modes.

Replacement Considerations

MAX3237EAI+