LTC1690CS8#PBF

Drivers, Receivers, Transceivers Overview

The LTC1690CS8#PBF is a low-power differential driver and receiver pair compatible with RS485 and RS422 standards, manufactured by Analog Devices Inc. It operates on a single 5V supply with a maximum supply current of 600mA under no-load conditions. The device supports data rates up to 5Mbps and features a fail-safe receiver that guarantees a high output state when inputs are open or shorted. It includes thermal shutdown protection for the driver outputs and withstands –15kV ESD (Human Body Model). The component is housed in an 8-lead Plastic Small Outline (SO) package.

Drivers, Receivers, Transceivers Feature Summary

• Fail-safe receiver guarantees a high logic state when inputs are floating, shorted, or terminated without a signal present.
• Thermal shutdown circuit protects against excessive power dissipation by forcing driver outputs into a high impedance state during faults.
• Glitch-free driver outputs permit live insertion or removal of the transceiver without damage or latchup.
• High ESD protection meets –15kV Human Body Model and IEC1000-4-2 Level 4 contact specifications.

Drivers, Receivers, Transceivers Applications

• Battery-powered RS485/RS422 applications
• Low power RS485/RS422 transceivers
• Level translators
• Line repeaters

Drivers, Receivers, Transceivers Procurement Notes

Verify the specific suffix #PBF indicates lead-free compliance and RoHS adherence as per manufacturer documentation. Confirm the 'C' designation corresponds to the commercial temperature range of 0°C to 70°C. Ensure the SOIC-8 package dimensions match the required PCB footprint constraints before finalizing procurement orders.

Drivers, Receivers, Transceivers Selection Notes

Select this component for full-duplex communication requiring separate driver and receiver pins. It is suitable for environments needing robust fault protection and high ESD immunity. Consider the 5V supply requirement and 5Mbps maximum data rate limits. Verify compatibility with existing bus termination strategies and cable types such as twisted pair or residential telephone wire.

Drivers, Receivers, Transceivers Part Context

The LTC1690 family provides complete power supply monitoring and interface functions. This specific part is a differential driver/receiver pair designed for RS485/RS422 networks. It is pin-compatible with legacy parts like the SN75179 and LTC490, facilitating direct upgrades in existing designs while offering improved ESD performance and fail-safe features.

Drivers, Receivers, Transceivers Replacement Considerations

The LTC490 is a pin-compatible alternative within the same product family. For designs requiring shutdown control, the LTC491 may be considered. Verify that substitute components maintain the required fail-safe behavior and ESD ratings for the specific application environment.

Drivers, Receivers, Transceivers FAQ

What is the fail-safe behavior of the receiver?

The receiver guarantees a high output state when the inputs are left open, shorted together, or terminated with no signal present, without requiring external components.

How does the device protect against driver faults?

A thermal shutdown circuit forces the driver outputs into a high impedance state if excessive power dissipation occurs due to bus contention or faults, preventing damage.

What is the common mode voltage range?

The device supports a common mode range of –7V to 12V, permitting up to a –7V ground difference between devices on the data line.