MAX240CMH+D

Overview

The MAX240CMH+D is a full RS-232 transceiver featuring five drivers and five receivers in a 44-MQFP package. It operates on a single +5V supply, utilizing internal charge pumps to generate ±10V for signal conversion without external components. The device supports data rates up to 120Kbps with an operating temperature range of 0°C to +70°C. Supply voltage requirements are specified between 4.5V and 5.5V. Receiver hysteresis is rated at 500mV, ensuring reliable input detection. The component is surface-mount compatible and designed for EIA/TIA-232E interfaces.

Feature Summary

• Integrates dual charge-pump circuitry to eliminate the need for bipolar power supplies
• Enables single-supply operation from a standard +5V source
• Provides full duplex communication capability for multidrop networks

Applications

• Interface translation between TTL/CMOS logic and RS-232 standards
• Multidrop RS-232 network implementations
• Portable diagnostics equipment requiring space-efficient designs

Procurement Notes

Verify the specific ordering suffix against manufacturer documentation to confirm package type and temperature grade. Confirm RoHS compliance status as indicated by the '+' designation. Check current production status, as this part number may be obsolete or subject to discontinuation notices. Ensure the supplier provides valid traceability documents matching the Analog Devices Inc./Maxim Integrated manufacturing origin.

Selection Notes

Select this component when designing systems requiring multiple independent RS-232 channels within a compact footprint. The integrated charge pump simplifies board layout by removing external capacitors typically required for voltage inversion. Verify that the system's power budget accommodates the typical supply current specifications under load conditions. Ensure the application environment remains within the specified commercial temperature limits.

Part Context

This device 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 MAX240 specifically addresses applications needing five transmit and five receive lines while maintaining compatibility with standard serial communication protocols.

Replacement Considerations

Public confirmed substitute part numbers: None identified.