LTC1484IN8#PBF

Drivers, Receivers, Transceivers Overview

The LTC1484IN8#PBF is a low power RS-485 transceiver manufactured by Analog Devices Inc. in an 8-lead PDIP package. It operates on a single 5V supply with a maximum quiescent current of 900µA when the driver is enabled and 700µA when disabled. The device supports data rates up to 5Mbps and features a receiver fail-safe mechanism that guarantees a high output state for floating, shorted, or terminated inputs without external components. It withstands –15kV ESD (Human Body Model) and includes thermal shutdown protection.

Drivers, Receivers, Transceivers Feature Summary

• Integrated fail-safe circuitry ensures a known high logic state at the receiver output when differential inputs are open, shorted, or terminated without active signals.
• Enhanced electrostatic discharge protection allows the A and B pins to withstand –15kV human body model discharges and IEC-1000-4-2 Level 4 contact specifications without latchup.
• Thermal shutdown circuit automatically forces driver outputs into a high impedance state if die temperature exceeds safe limits during short-circuit conditions.

Drivers, Receivers, Transceivers Applications

• Battery-powered RS-485 and RS-422 communication systems
• Industrial bus networks requiring low power consumption
• Level translation between different voltage domains

Drivers, Receivers, Transceivers Procurement Notes

Verify the specific ordering suffix '#PBF' indicates lead-free compliance and RoHS adherence as per manufacturer standards. Confirm the 'I' grade designation matches the required industrial operating temperature range of –40°C to 85°C. Ensure the 8-lead PDIP package type aligns with the target PCB footprint and assembly requirements.

Drivers, Receivers, Transceivers Selection Notes

Select this component for applications requiring robust fault protection and low standby power. The integrated fail-safe feature eliminates the need for external pull-up resistors to maintain a valid logic state during idle periods. Verify that the system's common mode voltage requirements fall within the specified –7V to 12V range for proper signal integrity.

Drivers, Receivers, Transceivers Part Context

This part belongs to the LTC1484 family of low power RS-485 transceivers. It is pin-compatible with the older LTC485 model, facilitating direct upgrades in existing designs. The device is available in multiple packages including MSOP, SO, and PDIP, with variations in temperature grades such as commercial (C) and industrial (I).

Drivers, Receivers, Transceivers Replacement Considerations

The LTC1484 is explicitly noted as pin compatible with the LTC485. When substituting, verify that the replacement device supports the same 5V supply voltage and meets the required ESD protection levels for the application environment.

Drivers, Receivers, Transceivers FAQ

How does the receiver fail-safe feature function?

The receiver fail-safe guarantees a high output state when the inputs are left open, shorted together, or terminated with no signal present, eliminating the need for external components to ensure a known logic state.

What is the ESD protection rating for the A and B pins?

The A and B pins can withstand –15kV using the Human Body Model, as well as IEC-1000-4-2 Level 4 (–8kV) contact and Level 3 (–8kV) air discharge specifications without damage or latchup.

What happens during a thermal shutdown event?

If the die temperature rises above 150°C due to prolonged shorts, the thermal shutdown circuit forces the driver outputs into a high impedance state. The outputs return to normal operation when the die cools to approximately 130°C.