LTC1387ISW#TRPBF

Drivers, Receivers, Transceivers Overview

The LTC1387ISW#TRPBF is a low-power reconfigurable CMOS bidirectional transceiver manufactured by Analog Devices Inc. It operates from a single 5V supply and can be configured as one RS485 differential port or two RS232 single-ended ports. The device features an onboard charge pump requiring four 0.1µF capacitors to generate boosted positive and negative supplies for RS232 drivers. It supports data rates up to 5MBd in fast slew mode and 150kBd in slow slew mode. The IC includes separate driver and receiver enable controls, loopback mode for self-testing, and thermal shutdown protection. It is housed in a 20-lead plastic SOIC (SW) package with an operating temperature range of -40°C to +85°C.

Drivers, Receivers, Transceivers Feature Summary

• Configurable interface supporting either one RS485/RS422 differential port or two RS232/EIA562 single-ended ports via logic inputs.
• Integrated charge pump generates internal ±VDD and VEE supplies from a single 5V source using external capacitors.
• Logic-selectable fast or slow slew rate control for the RS485 driver to manage signal reflections and EMI.
• Receiver outputs maintain a known high state when inputs are floating or shorted to ground.

Drivers, Receivers, Transceivers Applications

• Point-of-sale terminals
• Software selectable multiprotocol interface ports
• Cable repeaters
• Level translators

Drivers, Receivers, Transceivers Procurement Notes

Verify the suffix #TRPBF indicates tape and reel packaging distinct from tube variants. Confirm the ISW designation corresponds to the industrial temperature grade (-40°C to +85°C) and SOIC-20 package. Ensure compatibility with required external 0.1µF capacitors for the charge pump circuit. Check for RoHS compliance status on current production lots.

Drivers, Receivers, Transceivers Selection Notes

Select this component when a single chip must support both RS232 and RS485 protocols to save board space. The ISW variant is suitable for industrial environments requiring extended temperature ranges. Consider the 7mA typical supply current and 5µA shutdown current for power-sensitive designs. Verify that the 150kBd slow slew rate meets system timing requirements if long unshielded cables are used.

Drivers, Receivers, Transceivers Part Context

This part belongs to the LTC1387 family of multiprotocol transceivers. The 'I' suffix denotes the industrial temperature range, while 'S' indicates the SOIC package style. The '#PBF' signifies lead-free and RoHS compliant construction. Other variants include the IG (SSOP package) and C (commercial temperature) versions.

Drivers, Receivers, Transceivers Replacement Considerations

Public confirmed substitute part numbers include ISL81387IAZ and ISL81387IAZ-T from Renesas Electronics Corporation.