LTC491IS#TRPBF

Drivers, Receivers, Transceivers Overview

The LTC491IS#TRPBF is a low-power differential bus transceiver designed for multipoint data transmission in RS485 and RS422 applications. It operates on a single 5V supply (4.75V to 5.25V) with a typical supply current of 300mA. The device features an extended common mode range from –7V to 12V, allowing up to a 7V ground difference between devices. It supports data rates up to 2.5MBps with typical driver propagation delays of 28ns and skew of 5ns. The receiver includes 70mV hysteresis and a fail-safe feature that guarantees a high output state when inputs are open. The component is housed in a 14-lead SOIC package.

Drivers, Receivers, Transceivers Feature Summary

• Extended common mode range supporting –7V to 12V bus operation
• Thermal shutdown protection prevents damage from excessive power dissipation
• Glitch-free driver outputs enable live insertion or removal without data corruption
• Fail-safe receiver guarantees a high logic state when inputs are left floating

Drivers, Receivers, Transceivers Applications

• Multipoint data transmission networks using twisted pair cables
• RS485 and RS422 communication interfaces
• Line repeater configurations for extending cable length beyond standard limits

Drivers, Receivers, Transceivers Procurement Notes

Verify the IS suffix indicates the industrial temperature range of –40°C to 85°C. Confirm the TRPBF suffix denotes tape and reel packaging. Ensure the datasheet matches the specific revision required for your design constraints.

Drivers, Receivers, Transceivers Selection Notes

Select this component for applications requiring robust fault protection and extended common mode voltage tolerance. It is suitable where thermal shutdown and glitch-free operation are critical. Consider pin-compatible alternatives like the LTC1686/LTC1687 if higher speeds are needed.

Drivers, Receivers, Transceivers Part Context

This part belongs to the LTC491 family of low-power RS485/RS422 transceivers. It is pin-compatible with the SN75180 and offers CMOS-level power savings compared to bipolar counterparts while maintaining ruggedness against overload and ESD damage.

Drivers, Receivers, Transceivers Replacement Considerations

The LTC1686 and LTC1687 are confirmed pin-compatible replacements offering higher speed capabilities. Other related parts include the LTC1482 and LT1791A, which provide similar functionality with varying ESD protection levels.