MAX3237CAI

Overview

The MAX3237CAI+ is a true RS-232 transceiver from the MAX3222/MAX3232/MAX3237/MAX3241 family, manufactured by Analog Devices (Maxim Integrated). It operates on a single 3.0V to 5.5V supply and features five drivers and three receivers. The device utilizes a dual charge pump requiring only four 0.1µF external capacitors. In normal mode, it guarantees data rates up to 250kbps; in MegaBaud mode (MBAUD = VCC), it supports up to 1Mbps. It includes an AutoShutdown feature reducing supply current to less than 1µA and provides complementary receiver outputs for continuous monitoring.

Feature Summary

• Integrated dual charge pump eliminates the need for bipolar ±12V supplies
• MegaBaud operation enables high-speed serial communication at 1Mbps
• Always-on complementary receiver outputs allow external device monitoring without forward biasing protection diodes
• AutoShutdown control reduces power consumption significantly during idle periods

Applications

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

Procurement Notes

Verify the ordering suffix 'I' indicates the SSOP-28 package and 'C' specifies the commercial temperature range of 0°C to +70°C. Confirm the '+' suffix denotes lead-free compliance. Ensure the component source is authorized to guarantee authenticity, as counterfeit versions may exhibit incorrect pinouts or degraded electrical performance compared to the official datasheet specifications.

Selection Notes

Select the MAX3237CAI+ when five transmitter channels and three receiver channels are required within a single IC. This part is suitable for designs needing high-speed 1Mbps communication via the MegaBaud feature while maintaining low-power shutdown capabilities. Verify that the application environment falls within the commercial temperature range and that the system voltage remains between 3.0V and 5.5V.

Part Context

This component belongs to the MAX3222/MAX3232/MAX3237/MAX3241 series of low-power RS-232 transceivers. Unlike the MAX3222/MAX3232 which offer two drivers/receivers, or the MAX3241 with three drivers/five receivers, the MAX3237 specifically provides five drivers and three receivers. It shares the same proprietary low-dropout output stage and capacitor requirements as its siblings in the family.

Replacement Considerations

The MAX3237EAI+ serves as the industrial temperature range (-40°C to +85°C) equivalent. Other family members like the MAX3241 offer different driver/receiver counts but share similar interface characteristics.