MAX231EPD+

Overview

The MAX231EPD+ is a +5V-powered, multichannel RS-232 driver and receiver manufactured by Analog Devices/Maxim Integrated. It operates within an extended temperature range of -40°C to +85°C and utilizes a 14-pin PDIP package. The device provides full-duplex communication with two drivers and two receivers, supporting data rates up to 120 kb/s. It functions on a single +5V supply (5V to 7.5V minimum) without requiring external bipolar voltage sources. Electrical characteristics include a typical propagation delay of 10 µs, a supply current of 1 mA, and output voltage swings of ±5V to ±8V under load.

Feature Summary

• Integrates dual charge-pump circuits to generate internal ±10V levels from a single +5V supply, eliminating the need for external bipolar power rails.
• Provides full-duplex signal translation between TTL/CMOS logic levels and standard RS-232 voltage specifications.
• Features robust receiver inputs capable of tolerating input voltages up to ±30V.

Applications

• Interface translation between microcontrollers and RS-232 peripherals
• Multidrop RS-232 network connections
• Portable diagnostic equipment

Procurement Notes

Verify the component against official manufacturer documentation to confirm pinout compatibility and electrical ratings. Ensure that the specific ordering suffix matches the required temperature grade and packaging format. Cross-reference the datasheet revision history to validate performance parameters before finalizing procurement decisions.

Selection Notes

Select this component when designing systems requiring RS-232 connectivity powered exclusively by a single +5V rail. It is suitable for applications where board space is limited due to integrated charge pumps. Verify that the required data rate does not exceed 120 kb/s and that the operating environment falls within the specified -40°C to +85°C range.

Part Context

This part belongs to the MAX220–MAX249 family of line drivers and receivers designed for EIA/TIA-232E and V.28/V.24 interfaces. The series offers various channel configurations and packages to accommodate different system requirements while maintaining single-supply operation capabilities.

Replacement Considerations

The MAX232A is a direct functional substitute within the same family. Both devices share identical pinouts and core electrical specifications, allowing for drop-in replacement in existing designs without circuit modification.

FAQ

Does the MAX231EPD+ require external capacitors for operation?

Yes, the device requires four external capacitors to support its internal charge-pump voltage conversion circuitry.

What is the maximum input voltage tolerance for the receiver pins?

The receiver inputs are protected and can tolerate voltages up to ±30V relative to ground.

Is there a shutdown mode available on the MAX231EPD+?

No, the MAX231EPD+ does not feature a shutdown control pin; it operates continuously once powered.