LTC1686IS8#PBF

Drivers, Receivers, Transceivers Overview

The LTC1686IS8#PBF is a high-speed, full-duplex RS485 transceiver manufactured by Analog Devices Inc. It supports data rates up to 52Mbps and operates from a single 5V supply with a typical supply current of 7mA. The device features precision propagation delay characteristics, maintaining a receiver/driver delay of 18.5ns with a skew of 500ps. It guarantees fail-safe operation over the entire common mode range of –7V to 12V and includes short-circuit and thermal shutdown protection. The component is housed in an 8-lead plastic SOIC (S8) package.

Drivers, Receivers, Transceivers Feature Summary

• Precision timing architecture ensures stable propagation delays and low skew across temperature variations.
• Fail-safe receiver output guarantees a logic high state when inputs are shorted or floating within the common mode range.
• Integrated short-circuit and thermal shutdown protection safeguards against excessive power dissipation and fault conditions.

Drivers, Receivers, Transceivers Applications

• High Speed RS485/RS422 Full Duplex Transceivers
• Level Translator
• Backplane Transceiver
• STS-1/OC-1 Data Transceiver
• Signal Repeaters

Drivers, Receivers, Transceivers Procurement Notes

Verify the specific suffix #PBF indicates lead-free compliance and RoHS adherence before procurement. Confirm the IS8 variant corresponds to the industrial temperature range (-40°C to +85°C) and the S8 narrow SOIC package. Ensure the source document matches the official Analog Devices datasheet for accurate electrical specifications.

Drivers, Receivers, Transceivers Selection Notes

Select this component for applications requiring precise timing synchronization between driver and receiver outputs at high data rates. The 52Mbps capability suits backplane and repeater designs where duty cycle distortion must be minimized. Verify that the system operates within the specified 5V supply voltage and requires fail-safe behavior under line fault conditions.

Drivers, Receivers, Transceivers Part Context

This part belongs to the LTC1686/LTC1687 family of precision delay RS485 transceivers. The LTC1686 variant provides a fixed driver enable, whereas the LTC1687 includes separate driver and receiver enable pins. Both share identical electrical performance and pinout compatibility with legacy parts like the LTC490.

Drivers, Receivers, Transceivers Replacement Considerations

The LTC1686 is pin-compatible with the LTC490. Designers may consider the LTC1687 if independent control of driver and receiver states is required without changing the footprint.

Drivers, Receivers, Transceivers FAQ

What is the guaranteed fail-safe input resistance?

The receiver input resistance is guaranteed to be greater than or equal to 22kΩ even when the device is unpowered or disabled.

How does the device handle short-circuit conditions?

The device detects shorted outputs and substantially reduces the driver output current to approximately 20mA max until the short is removed, preventing latchup damage.

What is the maximum common mode voltage range?

The receiver guarantees fail-safe operation over a common mode range of –7V to 12V.