LTC1484CMS8#PBF

Drivers, Receivers, Transceivers Overview

The LTC1484CMS8#PBF is a low power RS485 transceiver manufactured by Analog Devices Inc. It operates on a single 5V supply and features a receiver fail-safe mechanism that guarantees a high output state when inputs are floating, shorted, or terminated without a signal. The device supports up to 32 transceivers on the bus and includes thermal shutdown protection. Electrical specifications include a maximum quiescent current of 700µA with the driver disabled and 900µA with the driver enabled. The common mode range extends from –7V to 12V, allowing for ground differences between devices.

Drivers, Receivers, Transceivers Feature Summary

• Enhanced ESD protection withstands –15kV human body model and IEC-1000-4-2 levels without latchup.
• Receiver fail-safe ensures a known high logic state during input faults or idle conditions.
• Thermal shutdown circuit prevents excessive power dissipation by forcing outputs to high impedance during shorts.

Drivers, Receivers, Transceivers Applications

• Battery-powered RS485/RS422 communication systems
• Level translation interfaces
• Carrier Detect Multiple Access (CDMA) networks

Drivers, Receivers, Transceivers Procurement Notes

Verify the specific suffix #PBF indicates lead-free compliance and RoHS adherence. Confirm the MSOP package variant matches the required footprint. Ensure the commercial temperature grade aligns with the operational environment requirements before finalizing procurement.

Drivers, Receivers, Transceivers Selection Notes

Select this component for applications requiring robust fault protection and low standby power. The integrated fail-safe eliminates the need for external pull-up resistors in many configurations. Verify that the 5V supply voltage and 3-wire interface compatibility match the system design constraints.

Drivers, Receivers, Transceivers Part Context

This part belongs to the LTC1484 series of RS485 transceivers. It is pin-compatible with the LTC485, facilitating direct upgrades or replacements in existing designs. The MSOP package provides a compact solution for space-constrained PCB layouts while maintaining industrial-grade performance characteristics.

Drivers, Receivers, Transceivers Replacement Considerations

The LTC485 is a confirmed pin-compatible substitute within the same product family. Verify that the replacement part meets the specific ESD and thermal shutdown requirements of the original design.

Drivers, Receivers, Transceivers FAQ

How does the receiver fail-safe feature function?

It guarantees a high receiver output state when the A and B inputs are left open, shorted together, or terminated with no signal present, eliminating the need for external components.

What is the common mode voltage range?

The device supports a common mode range of –7V to 12V, permitting up to a 7V ground difference between devices on the data line.

What happens during a driver short-circuit condition?

Internal circuitry limits the short-circuit current to 250mA. If the die temperature exceeds 150°C, thermal shutdown forces the outputs into a high impedance state until the temperature cools.