LTC1485IS8#TRPBF

Drivers, Receivers, Transceivers Overview

The LTC1485IS8#TRPBF is a low-power differential bus transceiver designed for multipoint data transmission in RS-485 applications, meeting RS-422 requirements. It features an extended common-mode range from -7V to +12V and operates on a single 5V supply (4.75V to 5.25V). The device includes one driver and one receiver with three-state outputs, delivering a typical supply current of 1.8mA. It supports data rates up to 20Mbps with typical propagation delays of 28ns and skew of 4ns. The component provides ±10kV ESD protection and thermal shutdown, operating reliably within the industrial temperature range of -40°C to +85°C.

Drivers, Receivers, Transceivers Feature Summary

• CMOS Schottky design ensures 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, ensuring known logic states.
• Driver maintains high impedance in three-state mode or when powered off, preventing bus contention.

Drivers, Receivers, Transceivers Applications

• Multipoint data transmission systems requiring RS-485 compliance
• Level translation between RS-232 receivers and RS-485 buses
• Industrial communication networks with ground differences up to ±7V

Drivers, Receivers, Transceivers Procurement Notes

Verify that the #TRPBF suffix indicates tape and reel packaging rather than tube packaging. Confirm the IS8 variant corresponds to the industrial temperature grade (-40°C to +85°C) and SOIC-8 package. Ensure compatibility with existing PCB footprints for the S8 package type before finalizing orders.

Drivers, Receivers, Transceivers Selection Notes

Select this component for designs requiring low quiescent current and high-speed data transmission over twisted pair cables. It serves as a pin-compatible replacement for SN75176A and DS75176A devices. Consider the extended common-mode range if significant ground potential differences exist between connected nodes.

Drivers, Receivers, Transceivers Part Context

This part belongs to the LTC1485 series of low-power RS-485/RS-422 transceivers manufactured by Analog Devices. The IS8 designation specifies the industrial temperature range and surface-mount SOIC-8 package. The #TRPBF suffix denotes lead-free finish and tape-and-reel shipping configuration.

Drivers, Receivers, Transceivers Replacement Considerations

LTC1485CS8#PBF: Commercial temperature grade version in tube packaging.

Drivers, Receivers, Transceivers FAQ

How does the LTC1485 handle bus contention?

The device uses a thermal shutdown circuit to force driver outputs into a high impedance state if excessive power dissipation occurs due to short circuits or contention.

What is the fail-safe feature of the receiver?

The receiver guarantees a high output state when the inputs are left open or floating, ensuring a known logic level during idle periods.

Can this transceiver tolerate ground differences?

Yes, the extended common-mode range of -7V to +12V permits up to ±7V ground difference between devices on the bus.