LTC1484CS8#PBF

Drivers, Receivers, Transceivers Overview

The LTC1484CS8#PBF is a low power RS-485 transceiver manufactured by Analog Devices Inc. It operates on a single 5V supply with a maximum quiescent current of 700µA when the driver is disabled and 900µA when enabled. The device supports data rates up to 5Mbps and accommodates up to 32 transceivers on the bus. It features enhanced ESD protection rated at -15kV (HBM) and -8kV (IEC). The receiver includes a fail-safe mechanism that guarantees a high output state for floating, shorted, or terminated inputs without external components. Thermal shutdown protects against excessive power dissipation during bus contention.

Drivers, Receivers, Transceivers Feature Summary

• Integrated fail-safe circuitry ensures a guaranteed high receiver output state when inputs are left open, shorted together, or terminated without an active signal present.
• Enhanced electrostatic discharge protection allows the A and B pins to withstand -15kV human body model discharges and -8kV IEC contact/air discharge events without latchup or damage.
• Thermal shutdown circuit automatically forces driver outputs into a high impedance state if die temperature exceeds safe limits, preventing damage from prolonged shorts or bus faults.

Drivers, Receivers, Transceivers Applications

• Battery-powered RS-485 and RS-422 communication systems
• Level translation between different voltage domains in industrial networks
• Carrier Detect Multiple Access (CDMA) applications requiring interrupt capabilities

Drivers, Receivers, Transceivers Procurement Notes

Verify the specific suffix CS8 corresponds to the 8-lead SOIC package required for your PCB layout. Confirm the operating temperature range matches your design needs, as the 'C' suffix denotes commercial grade (0°C to 70°C). Ensure the datasheet version aligns with your manufacturing requirements before finalizing orders.

Drivers, Receivers, Transceivers Selection Notes

Select this component for designs requiring low power consumption in standby modes while maintaining robust fault protection. It is suitable for replacing older RS-485 drivers where pin compatibility with the LTC485 is desired. Consider the thermal characteristics if operating in high ambient temperatures with potential bus short conditions.

Drivers, Receivers, Transceivers Part Context

This part belongs to the LTC1484 family of low power RS-485 transceivers. It is functionally compatible with the LTC485 but offers improved ESD performance and guaranteed fail-safe operation. The CS8 variant specifically refers to the plastic small outline package option within the broader product line.

Drivers, Receivers, Transceivers Replacement Considerations

The datasheet explicitly states the device is pin compatible with the LTC485. Verify that the replacement part meets the same ESD ratings and thermal shutdown specifications to ensure system reliability remains unchanged.

Drivers, Receivers, Transceivers FAQ

How does the fail-safe feature work when the bus is idle?

The receiver guarantees a high output state when the A and B inputs are floating, shorted together, or terminated with no signal present. This eliminates the need for external pull-up resistors to maintain a known logic state.

What happens if the driver outputs are shorted?

Internal circuitry limits the short-circuit current to 250mA. If the die temperature rises above 150°C, the thermal shutdown circuit forces the outputs into a high impedance state. The driver re-enables when the temperature drops to approximately 130°C.

Can this transceiver be used in CDMA applications?

Yes, the LTC1484 supports Carrier Detect Multiple Access (CDMA) schemes. By connecting DE and RE together, the device can detect collisions and allow nodes to interrupt ongoing communications effectively.