ISL31485EIBZ-T

Overview

The ISL31485EIBZ-T is a half-duplex RS-485/RS-422 transceiver manufactured by Renesas Electronics Corporation. It operates on a single 5V supply (4.5V to 5.5V) and supports data rates up to 1Mbps with slew-rate limiting. The device features ±60V fault protection on bus pins and an extended common-mode range of ±25V. It incorporates cable invert functionality for polarity reversal while maintaining full fail-safe operation. Packaged in an 8-lead SOIC, it draws 2.3mA quiescent current and provides hot-plug capability.

Feature Summary

• Includes dedicated cable invert pins that reverse the polarity of receiver and driver outputs to correct reversed cable connections without losing fail-safe functionality.
• Provides robust fault protection on RS-485 bus pins against voltages up to ±60V and withstands transient pulses up to ±80V.
• Features a true 1/4 unit load design allowing up to 128 devices on the network while maintaining standard compliance.
• Ensures a logic high receiver output when inputs are floating, shorted, or connected to an undriven terminated bus.

Applications

• Utility meters and automated meter reading systems
• High node count RS-485 networks
• PROFIBUS and factory automation field bus networks
• Security camera networks
• Building lighting and environmental control systems

Procurement Notes

Verify the specific ordering suffix '-T' corresponds to tape and reel packaging as defined in the manufacturer's technical brief TB347. Confirm the package drawing number M8.15 matches the required footprint. Ensure the component meets RoHS compliance standards regarding lead-free material sets and termination finishes.

Selection Notes

Select this model for applications requiring half-duplex communication with integrated cable inversion capabilities. It is suitable for environments with significant ground potential differences due to its ±25V common-mode range. Verify that the system does not require independent receiver enable control, as this variant lacks a separate RE pin compared to the full-duplex ISL31483E.

Part Context

This component belongs to the ISL3148xE family of fault-protected differential transceivers designed to exceed standard RS-485 requirements. It is part of Renesas' portfolio of interface ICs intended for rugged industrial communication. The datasheet indicates it is not recommended for new designs, suggesting the availability of newer alternatives within the same product line.

Replacement Considerations

The datasheet explicitly recommends the ISL32483E and ISL32485E as replacement parts for the ISL31483E and ISL31485E respectively.