MAX3250CAI+

Overview

The MAX3250CAI+ is a dual-die, ±50V isolated RS-232 transceiver operating on a single 3.0V to 5.5V supply. It features two drivers and two receivers with a guaranteed data rate of 250kbps. The device utilizes external ±100V capacitors for power transfer across the isolation barrier. It includes a FAULT open-drain output to signal excessive isolated-side voltage conditions. The component operates within a commercial temperature range of 0°C to +70°C and is housed in a 28-pin SSOP package.

Feature Summary

• Provides ±50V isolation capability between logic and RS-232 sides to handle high common-mode voltages
• Integrates dual charge pumps to generate true RS-232 levels from low-voltage supplies without inductors or transformers
• Includes a FAULT output pin that signals when the isolated-side voltage exceeds safe limits
• Features a shutdown mode that reduces supply current to 20µA and places outputs in a high-impedance state

Applications

• Industrial Control Systems
• Programmable Logic Controllers (PLCs)
• Point-of-Sale (POS) Equipment
• PC-to-Router Connections
• Diagnostic Ports
• Telecom Equipment

Procurement Notes

Verify the specific suffix CAI+ corresponds to the commercial temperature range of 0°C to +70°C. Confirm the package type is 28-pin SSOP. Ensure the ordering part number matches the exact manufacturer designation to avoid compatibility issues with isolation requirements.

Selection Notes

Select this component when ±50V isolation is required between the logic ground and the RS-232 interface. It serves as a cost-effective alternative to opto-isolated transceivers. Ensure application loads do not exceed the specified 3kΩ parallel with 1000pF constraints for maximum data rates.

Part Context

This device belongs to the MAX3250 family of isolated RS-232 transceivers. The CAI+ variant specifically denotes the commercial temperature grade. Other variants like the EAI+ offer extended industrial temperature ranges. The family integrates isolation and RS-232 functionality into a single compact package.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.