MAX3221CDBR

Overview

The MAX3221CDBR is a single-channel RS-232 line driver and receiver manufactured by Texas Instruments. It operates from a single 3V to 5.5V supply and features a data rate of 250kbps. The device includes an integrated charge pump requiring only four external 0.1µF capacitors. It provides ±15kV ESD protection on RS-232 inputs and outputs. The component supports full-duplex communication with one driver and one receiver, housed in a 16-SSOP package.

Feature Summary

• Integrated charge pump eliminates need for dual voltage supplies
• Robust electrostatic discharge protection on all RS-232 lines
• Low power consumption with automatic shutdown mode
• True 3V operation compatible with low voltage logic

Applications

• Portable equipment requiring RS-232 connectivity
• Modems and fax machines
• Industrial control systems
• Handheld terminals and POS systems

Procurement Notes

Verify the suffix 'C' indicates commercial temperature range (-40°C to 85°C) per datasheet. Confirm package type matches SSOP-16 requirements. Check RoHS compliance status as specified in latest documentation. Ensure ordering quantity aligns with reel specifications.

Selection Notes

Select this part for single-port RS-232 applications needing low component count. Verify voltage levels match system requirements between 3V and 5.5V. Consider thermal performance within the commercial operating range. Compare pinout compatibility if replacing legacy components.

Part Context

Part of the MAX3221 family of true 3V RS-232 transceivers. Designed for battery-powered devices where space and power are critical constraints. Offers high reliability through integrated ESD protection and simplified external circuitry requirements compared to older generation drivers.

Replacement Considerations

MAX3221IDBR: Industrial temperature grade variant with identical electrical characteristics but wider operating range.

FAQ

What is the maximum data rate supported?

The MAX3221CDBR supports data rates up to 250kbps.

How many external capacitors are required?

Four 0.1µF capacitors are required for the internal charge pump circuit.

Does it support 3.3V logic levels?

Yes, it operates with a single 3V to 5.5V supply and is compatible with 3.3V logic.