MAX239EWG+

Overview

The MAX239EWG+ is a +5V-powered, multichannel RS-232 driver and receiver integrated circuit manufactured by Analog Devices Inc./Maxim Integrated. It operates within a commercial temperature range of 0°C to +70°C and utilizes a 24-pin Wide SOIC package. The device provides three drivers and five receivers for full-duplex communication with a data rate of 120 kb/s. It features an internal charge pump that generates the required ±10V supply rails from a single +5V input, eliminating the need for external bipolar power supplies.

Feature Summary

• Integrates dual charge-pump DC-DC voltage converters to generate internal ±10V operation from a single +5V supply
• Provides three independent RS-232 drivers and five independent RS-232 receivers for complex interface applications
• Supports full-duplex communication protocols compliant with EIA/TIA-232E standards

Applications

• Interface translation between TTL/CMOS logic levels and RS-232 serial ports
• Multidrop RS-232 network configurations requiring multiple channels
• Portable diagnostic equipment utilizing single-supply architectures

Procurement Notes

Verify the specific suffix 'EWG+' against the manufacturer's current ordering guide to confirm the exact package dimensions and lead-free status. Confirm the commercial temperature grade (0°C to +70°C) matches the operational environment requirements before finalizing procurement specifications.

Selection Notes

Select this component when designing systems that require more than two transmit or receive lines but cannot accommodate a negative voltage rail. Ensure the PCB layout accommodates the necessary external capacitors for the charge pump circuitry as specified in the datasheet application circuits.

Part Context

This part belongs to the MAX220–MAX249 family of line drivers and receivers designed specifically for applications where generating ±12V is impractical. The MAX239 variant is distinguished by its specific count of three drivers and five receivers, offering a higher channel density compared to standard dual-driver transceivers.

Replacement Considerations

Direct replacements include other members of the MAX220-MAX249 family such as the MAX232 or MAX249, provided the pinout and channel counts are compatible with the existing design constraints.