MAX232AC/D

Overview

The MAX232AC/D is a dual driver and receiver RS-232 transceiver designed for EIA/TIA-232E and V.28/V.24 communication interfaces. Operating from a single +5V supply (4.5V to 5.5V), it utilizes an internal charge pump to generate ±10V levels, requiring four external capacitors. The device supports full-duplex data transmission at rates up to 120kb/s. It features two drivers with ±15V output swings and two receivers capable of accepting ±30V input signals. The AC variant operates within a commercial temperature range of 0°C to +70°C.

Feature Summary

• Integrates dual charge-pump circuits to convert a single +5V supply into the required ±10V voltage rails for RS-232 signaling.
• Provides bidirectional level translation between TTL/CMOS logic inputs and standard RS-232 voltage levels.
• Includes built-in protection allowing receivers to tolerate input voltages up to ±30V without damage.

Applications

• Interface translation between microcontrollers and PC serial ports
• Multidrop RS-232 network connections
• Portable diagnostic equipment

Procurement Notes

Verify the specific suffix against the manufacturer's current ordering guide to confirm package type and temperature grade. Confirm RoHS compliance status as manufacturing processes evolve. Ensure the selected package matches the PCB footprint requirements before finalizing procurement orders.

Selection Notes

Select this component when designing systems that require reliable RS-232 communication using a standard +5V power rail. It is suitable for applications where space savings are prioritized over eliminating external capacitors. Consider higher-speed variants if data rates exceed 120kb/s or if lower propagation delay is critical for system timing.

Part Context

This part belongs to the MAX220–MAX249 family of multichannel RS-232 drivers and receivers developed by Maxim Integrated. The MAX232A variant specifically reduces the required external capacitance values compared to the original MAX232, facilitating smaller circuit board layouts while maintaining identical functional performance and pinout compatibility.

Replacement Considerations

Direct replacements include the MAX232CPE and MAX232IDR. Verify that substitute parts maintain the same 16-pin package configuration and electrical characteristics to ensure seamless integration without redesigning the surrounding passive components.