MAX239CWG

Overview

The MAX239CWG is a +5V-powered, multichannel RS-232 driver and receiver integrated circuit manufactured by Analog Devices Inc./Maxim Integrated. It operates within a supply voltage range of 5V to 13.2V and supports data rates up to 120 kb/s. The device features three drivers and five receivers in full-duplex configuration. It utilizes an internal charge pump to generate the required ±10V levels from a single +5V supply, eliminating the need for external bipolar supplies. The component is housed in a 24-pin SOIC package and functions reliably across an operating temperature range of 0°C to +70°C.

Feature Summary

• Integrates dual charge-pump DC-DC converters to generate internal ±10V rails from a single +5V input.
• Provides three independent RS-232 drivers and five independent RS-232 receivers for multidrop network applications.
• Features TTL/CMOS-compatible inputs and outputs with ±30V protection on receiver inputs.

Applications

• Interface translation between TTL/CMOS logic and RS-232 serial ports
• Multidrop RS-232 communication networks
• Portable diagnostic equipment requiring single-supply operation

Procurement Notes

Verify the specific suffix 'CWG' against the manufacturer's current ordering guide to confirm package dimensions and lead finish specifications. Ensure that the procurement channel provides documentation confirming RoHS compliance status as indicated in the official datasheet. Cross-reference the part number with the latest product change notices to verify manufacturing continuity and material composition updates.

Selection Notes

Select this component when designing systems that require multiple RS-232 channels without access to negative voltage rails. The MAX239CWG is suitable for space-constrained designs due to its integrated charge pump, which removes the need for bulky external capacitors found in older generations. Evaluate the 120 kb/s data rate limit to ensure it meets the throughput requirements of the target application interface.

Part Context

This device belongs to the MAX220–MAX249 family of line drivers/receivers designed for EIA/TIA-232E and V.28/V.24 communications interfaces. The family offers various configurations of drivers and receivers in different packages. The MAX239 specifically addresses applications needing three drivers and five receivers in a compact surface-mount form factor.

Replacement Considerations

The HIN239CBZ is documented as a direct replacement for the MAX239CWG. Verify pinout compatibility and electrical parameter alignment before substitution. Other family members like the MAX232 or MAX245 offer different channel counts and should only be considered if the specific 3-driver/5-receiver configuration is not mandatory.