LTC491CN#PBF

Drivers, Receivers, Transceivers Overview

The LTC491CN#PBF is a low-power differential bus transceiver designed for RS-485 and RS-422 applications. It features a single 5V supply with a typical supply current of 300mA. The device supports an extended common mode range from -7V to 12V, allowing up to a 7V ground difference between devices on the bus. It includes thermal shutdown protection and glitch-free driver outputs for live insertion. The receiver provides fail-safe operation with 70mV hysteresis. Operating temperatures range from 0°C to 70°C. It is housed in a 14-lead PDIP package.

Drivers, Receivers, Transceivers Feature Summary

• Designed for multipoint data transmission standards RS-485 and RS-422
• Extended common mode range permits ground differences between devices
• Thermal shutdown protects against excessive power dissipation
• Glitch-free driver outputs permit live insertion or removal

Drivers, Receivers, Transceivers Applications

• Multipoint data transmission networks
• Phone Net-type applications
• Interfacing to Apple LocalTalk networks

Drivers, Receivers, Transceivers Procurement Notes

Verify the ordering suffix #PBF indicates lead-free status and RoHS compliance. Confirm the CN suffix specifies the commercial temperature range of 0°C to 70°C. Ensure the 14-pin PDIP package matches the target PCB footprint. Cross-reference the manufacturer part number with official Analog Devices documentation to validate authenticity.

Drivers, Receivers, Transceivers Selection Notes

Select this component when a low-power RS-485/RS-422 transceiver with extended common mode voltage is required. It is suitable for systems needing a single 5V supply and thermal protection. Consider the 0°C to 70°C operating range limits compared to industrial variants. Verify that the 2.5MBps speed capability meets the system's data rate requirements.

Drivers, Receivers, Transceivers Part Context

This part belongs to the LTC491 family of differential bus line transceivers. It is pin-compatible with the SN75180. Related parts include the LTC490 and various LTC1xxx series transceivers offering higher speeds or different supply voltages. The family covers both PDIP and SOIC packages with varying temperature grades.

Drivers, Receivers, Transceivers Replacement Considerations

The SN75180 is explicitly noted as pin-compatible. Other LTC491 variants such as the IS (SOIC) or IN (Industrial Temp) versions offer package or temperature changes without functional alteration.