MAX250ESD+

Overview

The MAX250ESD+ is a dual RS-232 transceiver manufactured by Analog Devices Inc. under the Maxim Integrated brand, designed for EIA/TIA-232-F and V.28/V.24 communications interfaces. It integrates two drivers and two receivers within a single package, supporting full-duplex data transmission at rates up to 120kbps. The device operates on a single +5V power supply with a typical quiescent current of 350µA. It features an integrated shutdown mode that reduces power consumption significantly when inactive. The component includes internal charge pumps to generate the necessary positive and negative voltages from the single supply, eliminating the need for external components.

Feature Summary

• Dual driver and receiver configuration for simultaneous bidirectional communication
• Integrated charge pump circuitry eliminates requirement for external capacitors or split supplies
• Shutdown capability provides low-power standby operation
• Compliance with EIA/TIA-232-F interface standards

Applications

• Industrial control systems requiring serial communication
• Modem interfacing in telecommunications equipment
• Point-of-sale (POS) terminals
• Medical instrumentation with serial data links

Procurement Notes

Verify the specific suffix 'ESD+' against the official datasheet to confirm the exact temperature range and packaging variant. Ensure compatibility with existing PCB footprints for the selected package type. Cross-reference the manufacturer's latest documentation for any updates to electrical characteristics or pin assignments before finalizing procurement specifications.

Selection Notes

Select this component when designing systems requiring isolated RS-232 connections without external voltage generation circuits. Consider the operating temperature range specified in the datasheet relative to the application environment. Evaluate the shutdown feature requirements if power management is critical. Confirm that the 120kbps data rate meets the system's throughput needs.

Part Context

The MAX250 belongs to the Maxim Integrated family of RS-232 transceivers, which are widely used in legacy and industrial serial communication applications. This series is characterized by its ability to operate from a single supply voltage while generating the required higher voltage levels internally. The MAX250 specifically offers dual channels, making it suitable for applications needing multiple independent serial ports.

Replacement Considerations

MAX250CPE+

FAQ

Does the MAX250ESD+ require external capacitors for the charge pump?

No, the MAX250 integrates the charge pump circuitry internally, typically requiring only external coupling capacitors for the RS-232 lines.

What is the maximum data rate supported by the MAX250?

The MAX250 supports data rates up to 120kbps.

How does the shutdown feature affect power consumption?

The shutdown mode significantly reduces the quiescent current, allowing the device to enter a low-power state when not actively transmitting or receiving data.