LTC485IS8#PBF

Drivers, Receivers, Transceivers Overview

The LTC485IS8#PBF is a low-power RS-485/RS-422 differential bus transceiver manufactured by Analog Devices Inc. It operates on a single 5V supply (4.75V to 5.25V) and supports data rates up to 2.5MB/s with typical driver propagation delays of 30ns and skew of 5ns. The device features an extended common mode range from -7V to +12V, allowing for ±7V ground differences between devices. Key electrical characteristics include a typical supply current of 300μA, thermal shutdown protection, and fail-safe receiver outputs that guarantee a high state when inputs are open. It is housed in an 8-lead SOIC package and functions over the industrial temperature range of -40°C to +85°C.

Drivers, Receivers, Transceivers Feature Summary

• CMOS design provides significant power savings while maintaining ruggedness against overload and ESD damage
• Thermal shutdown circuit prevents excessive power dissipation by forcing driver outputs into a high impedance state during faults
• Fail-safe receiver guarantees a high output state when inputs are left open
• Power-up/down glitch-free driver outputs permit live insertion or removal of the transceiver

Drivers, Receivers, Transceivers Applications

• Low power RS-485/RS-422 transceiver applications
• Level translator circuits
• Multipoint data transmission systems requiring extended common mode range

Drivers, Receivers, Transceivers Procurement Notes

Verify the specific suffix #PBF indicates lead-free finish and RoHS compliance as per the manufacturer's ordering information. Confirm the IS8 designation corresponds to the industrial temperature grade (-40°C to +85°C) and the S8 plastic SOIC package type. Ensure compatibility with the required voltage levels and interface standards before finalizing procurement specifications.

Drivers, Receivers, Transceivers Selection Notes

Select this component for applications requiring low power consumption alongside robust fault protection. The extended common mode range makes it suitable for environments with significant ground potential differences. Consider the 300μA typical supply current for battery-operated systems. Verify that the 2.5MB/s maximum data rate meets system timing requirements and that the 8-lead SOIC package fits the PCB layout constraints.

Drivers, Receivers, Transceivers Part Context

The LTC485 series represents a CMOS alternative to traditional bipolar RS-485 transceivers, offering reduced power consumption without sacrificing performance. The IS8 variant specifically targets industrial environments with its wider operating temperature range compared to commercial grades. This part belongs to a family of interface ICs designed for reliable multipoint communication in noisy industrial settings.

Drivers, Receivers, Transceivers Replacement Considerations

The datasheet notes pin compatibility with the ±60V protected LTC2862. Other related parts include the LTC1481 for ultra-low power applications and the LT1785/LT1791 for ±60V protected variants. Verify functional equivalence regarding common mode range and drive capability when substituting.