LTC1387CG#PBF

Drivers, Receivers, Transceivers Overview

The LTC1387CG#PBF 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 using 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. Typical supply current is 7mA, reducing to 5µA in shutdown mode. The component is housed in a 20-lead plastic SSOP package and operates within a temperature range of 0°C to 70°C.

Drivers, Receivers, Transceivers Feature Summary

• Configurable interface supporting either one RS485/RS422 differential port or two RS232/EIA562 single-ended ports via logic control.
• Integrated charge pump generates internal boosted voltage rails from a single 5V supply, eliminating the need for external dual-voltage sources.
• Logic-selectable fast and slow slew rates for the RS485 driver to optimize signal integrity and minimize EMI on improperly terminated cables.
• Includes diagnostic loopback mode allowing driver outputs to connect internally to receiver inputs for self-testing.

Drivers, Receivers, Transceivers Applications

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

Drivers, Receivers, Transceivers Procurement Notes

Verify the specific suffix #PBF indicates lead-free compliance and RoHS status before procurement. Confirm the CG suffix corresponds to the commercial temperature grade (0°C to 70°C) rather than the industrial grade (IG). Ensure the required 20-pin SSOP footprint matches the PCB layout design specifications.

Drivers, Receivers, Transceivers Selection Notes

Select this component when a single-port solution capable of switching between RS232 and RS485 standards is required. It is suitable for applications needing low power consumption with a dedicated shutdown mode. Consider the 20-lead SSOP package constraints if board space is limited compared to wider SOIC options.

Drivers, Receivers, Transceivers Part Context

This part belongs to the LTC1387 series of multiprotocol transceivers. It shares functional similarities with the LTC1387ISW but differs in operating temperature range and physical package type. The series is designed to replace separate RS232 and RS485 transceivers in systems requiring flexible communication protocols.

Drivers, Receivers, Transceivers Replacement Considerations

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

Drivers, Receivers, Transceivers FAQ

How does the SLEW pin affect RS485 operation?

In RS485 mode, the SLEW pin controls the driver slew rate. A high logic level selects the fast slew rate for data rates up to 5MBd, while a low logic level selects the slow slew rate for data rates up to 150kBd to reduce reflections.

What is the function of the ON input pin?

The ON input keeps the charge pump active regardless of the DXEN and RXEN states. This allows the drivers and receivers to be enabled without waiting for the typical 100ms charge pump stabilization time after power-up.

Does the device provide ESD protection?

No, the datasheet specifies that the LTC1387CG#PBF does not include built-in ESD protection on its pins.