LTC491CS#PBF

Drivers, Receivers, Transceivers Overview

The LTC491CS#PBF is a low-power differential bus transceiver designed for RS485 and RS422 applications. It operates on a single 5V supply with a typical supply current of 300mA. The device features an extended common mode range from -7V to 12V, allowing up to 32 transceivers on the bus. Key electrical parameters include a driver propagation delay of 28ns typical, receiver hysteresis of 70mV, and thermal shutdown protection. It is available in a 14-lead SOIC package.

Drivers, Receivers, Transceivers Feature Summary

• Designed for multipoint data transmission standards including RS485 and RS422.
• Features thermal shutdown protection to prevent excessive power dissipation during faults.
• Includes fail-safe receiver output that guarantees a high state when inputs are open.
• Driver outputs maintain high impedance in three-state or power-off conditions.

Drivers, Receivers, Transceivers Applications

• Multipoint data transmission networks using twisted pair cables.
• RS485 communication systems requiring extended common mode voltage ranges.
• Line repeater configurations for long-distance signal transmission.

Drivers, Receivers, Transceivers Procurement Notes

Verify the specific suffix #PBF indicates lead-free compliance and RoHS status before procurement. Confirm the CS variant meets the required commercial temperature range of 0°C to 70°C. Ensure the 14-lead SOIC footprint matches the PCB layout constraints. Cross-reference the manufacturer's latest datasheet for any pinout or specification updates.

Drivers, Receivers, Transceivers Selection Notes

Select this component for applications requiring robust fault protection and extended common mode voltage tolerance. Consider the 300mA supply current for power budget calculations. Verify compatibility with existing RS485/RS422 protocols. Evaluate the need for thermal shutdown versus other protection mechanisms based on expected bus contention scenarios.

Drivers, Receivers, Transceivers Part Context

The LTC491 is part of Analog Devices' (formerly Linear Technology) family of low-power RS485/RS422 transceivers. It serves as a cost-effective solution for industrial communication networks. The device is pin-compatible with older bipolar counterparts like the SN75180, facilitating design upgrades.

Drivers, Receivers, Transceivers Replacement Considerations

The LT1791A is listed as a pin-compatible replacement offering -60V protection. The LTC1686/LTC1687 provides higher speed options while maintaining pin compatibility. Verify functional equivalence regarding common mode range and drive strength before substitution.