LTC1484IS8#TRPBF

Drivers, Receivers, Transceivers Overview

The LTC1484IS8#TRPBF is a low power RS-485 transceiver manufactured by Analog Devices Inc. It operates on a single 5V supply (4.75V to 5.25V) and features receiver fail-safe functionality 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. It offers enhanced ESD protection rated at -15kV (HBM) and meets IEC-1000-4-2 Level 4 contact specifications. The IS8 suffix indicates an industrial temperature range of -40°C to 85°C in an 8-lead SOIC package.

Drivers, Receivers, Transceivers Feature Summary

• Fail-safe receiver design ensures a known high logic state during idle or fault conditions without external components.
• Robust electrostatic discharge protection withstands -15kV human body model discharges without latchup.
• Thermal shutdown circuitry protects against excessive power dissipation by forcing outputs to high impedance during shorts.
• Glitch-free driver outputs prevent false triggering during power-up and power-down sequences.

Drivers, Receivers, Transceivers Applications

• Battery-powered RS-485 communication systems
• Industrial level translation interfaces
• Residential telephone wire data transmission
• Carrier Detect Multiple Access (CDMA) networks

Drivers, Receivers, Transceivers Procurement Notes

Verify the specific ordering suffix to confirm the package type and temperature rating. The #TRPBF designation indicates tape and reel packaging with lead-free compliance. Confirm the exact part number matches the required industrial grade specifications before procurement.

Drivers, Receivers, Transceivers Selection Notes

Select this component for applications requiring low quiescent current and robust fault protection. Ensure the system voltage remains within the 4.75V to 5.25V range. Consider the thermal characteristics if operating in environments with potential output short circuits.

Drivers, Receivers, Transceivers Part Context

This device belongs to the LTC1484 family of low power RS-485 transceivers. It is pin-compatible with the LTC485, facilitating direct upgrades or replacements in existing designs. The series emphasizes reliability through integrated fail-safe and ESD protection mechanisms.

Drivers, Receivers, Transceivers Replacement Considerations

The LTC1484 is explicitly noted as pin compatible with the LTC485. Verify electrical parameters such as supply current and propagation delay to ensure functional equivalence in the target application.

Drivers, Receivers, Transceivers FAQ

How does the receiver fail-safe feature operate?

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

What is the common mode voltage range?

The device supports a common mode range from -7V to 12V, allowing for ground differences of up to 7V between devices on the data line.

What happens during a thermal shutdown event?

If the die temperature exceeds approximately 150°C due to a short circuit, the thermal shutdown circuit forces the driver outputs into a high impedance state. The outputs resume normal operation when the temperature drops to about 130°C.