General Description

The MAX3250 is a 3.0V to 5.5V powered, ±50V isolated EIA/TIA-232 and V.28/V.24 communications interface with high data-rate capabilities. The MAX3250 is a dual die part that operates with up to ±50V difference between the RS-232 side and the logic side (ISOCOM to GND). This makes the device ideal for operation in noisy conditions with high common-mode voltages. This feature prevents damage to the device if RS-232 lines are inadvertently short-circuited to a +24V or ±48V power bus.

Benefits and Features

• Isolation Breaks Ground Loops Due to High CommonMode Voltages While Maintaining Data Rate

• ±50V Isolation

• 250kbps Guaranteed Data Rate

• FAULT Output Signals Excessive Isolated-Side Voltage

• Integration of Isolation and RS-232 Saves Space

• SSOP Package

• Shutdown Allows Multiple Interfaces (IrDA, RS-232, RS-485) to be Connected to the Same UART

• High-Impedance Transmitter and Receiver Outputs in Shutdown

• 20µA Supply Current in Shutdown

• Inductorless/Transformerless Design Simplifies EMI Compliance

• Low-Cost Replacement for Opto-Isolated Transceivers

• Meets EIA/TIA-232 Specifications Down to 3.0V

Applications

Industrial Control

Programmable Logic Controller

Point-of-Sale Equipment

PC-to-Router Connections

Diagnostic Ports

Telecom Equipment