MAX244CQH+D

Overview

The MAX244CQH+D is a +5V-powered, multichannel RS-232 transceiver from the MAX220–MAX249 family. It integrates dual charge-pump DC-DC voltage converters to generate ±10V internal supplies from a single +5V source, eliminating the need for external bipolar power rails. The device provides eight drivers and ten receivers with full-duplex communication capability. It operates at data rates up to 120 kbps and functions within an industrial temperature range of 0°C to +70°C. The component is housed in a 44-pin PLCC surface-mount package.

Feature Summary

• Integrates dual charge-pump circuitry to convert a single +5V supply into internal ±10V voltages for RS-232 signaling.
• Provides high noise immunity through receiver input hysteresis and robust ±30V input protection on receiver pins.
• Features TTL/CMOS-compatible logic levels for direct interfacing with microcontrollers and digital systems.

Applications

• Interface translation between TTL/CMOS logic and RS-232 serial ports
• Multidrop RS-232 network implementations
• Portable diagnostic equipment requiring serial connectivity

Procurement Notes

Verify the specific suffix 'D' corresponds to the PLCC-44 package configuration required by the design. Confirm that the lead-free designation aligns with environmental compliance standards. Ensure the operating temperature grade matches the intended application environment, as commercial variants are limited to 0°C to +70°C.

Selection Notes

Select this component when board space constraints preclude the use of discrete charge-pump circuits or external bipolar power supplies. It is suitable for applications requiring multiple serial channels without complex power management. Verify that the maximum data rate requirement does not exceed 120 kbps and that the system can accommodate the propagation delays inherent to the charge-pump architecture.

Part Context

This part belongs to the Maxim Integrated MAX220–MAX249 family of line drivers and receivers designed for EIA/TIA-232E and V.28/V.24 interfaces. The family offers various channel counts and package options to address different integration needs while maintaining single-supply operation capabilities.

Replacement Considerations

Public confirmed substitute part numbers: None identified in verified documentation.