MAX249CQH+TD

Overview

The MAX249CQH+TD is a multichannel RS-232 driver and receiver manufactured by Analog Devices Inc./Maxim Integrated. It operates from a single +5V supply, utilizing internal charge pumps to generate the required ±10V for RS-232 signaling without external bipolar supplies. The device features three drivers and three receivers with independent enable controls. It supports data rates up to 120kbps and includes low-power shutdown modes. The component is housed in a 44-pin QFP package and is rated for operation across an industrial temperature range.

Feature Summary

• Integrated dual charge-pump DC-DC converters eliminate the need for external components or bipolar power supplies.
• Independent control inputs allow selective activation of transmitters and receivers to minimize power consumption.
• Low-power shutdown mode significantly reduces current draw when the interface is inactive.
• Robust input protection tolerates voltages up to ±30V on receiver inputs.

Applications

• Multidrop RS-232 networks
• Portable diagnostics equipment
• Interface translation between TTL/CMOS logic and RS-232 standards

Procurement Notes

Verify the specific suffix 'TD' against official manufacturer documentation to confirm tape-and-reel packaging and exact temperature grade. Ensure compatibility with the target PCB footprint for the 44-pin QFP package. Cross-reference the ordering information table in the datasheet to validate availability and production status before finalizing procurement plans.

Selection Notes

Select this component for applications requiring multiple RS-232 channels within a single integrated circuit. It is suitable for systems constrained by board space due to the elimination of external charge-pump capacitors. Consider the independent enable pins if dynamic power management of specific communication lines is required during system operation.

Part Context

This part belongs to the MAX220–MAX249 family of +5V-powered, multichannel RS-232 drivers and receivers. The family offers various channel configurations and package options to suit different interface density requirements. The MAX249 specifically provides three drivers and three receivers, distinguishing it from other members like the MAX232 (two drivers/receivers) or MAX248 (four drivers/four receivers).

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided source material.