LTC1690IN8#PBF

Drivers, Receivers, Transceivers Overview

The LTC1690IN8#PBF is a low-power differential driver and receiver pair compatible with RS-422 and RS-485 standards, manufactured by Analog Devices Inc. It operates on a single 5V supply (4.75V to 5.25V) and supports data rates up to 5 Mbps. The device features a fail-safe receiver that guarantees a high output state when inputs are floating or shorted. It includes thermal shutdown protection for the driver outputs and withstands –15kV ESD via the Human Body Model. The IN8 suffix indicates an industrial temperature range (-40°C to +85°C), and it is housed in an 8-pin PDIP package.

Drivers, Receivers, Transceivers Feature Summary

• Fail-safe receiver design ensures a known high logic state when bus inputs are open, shorted, or terminated without a signal.
• Integrated thermal shutdown circuit protects against excessive power dissipation during bus contention or output faults.
• High electrostatic discharge tolerance at driver and receiver pins eliminates the need for external suppressors in many applications.
• Glitch-free driver outputs during power-up and power-down cycles permit live insertion or removal of the transceiver.

Drivers, Receivers, Transceivers Applications

• Battery-powered RS-485 and RS-422 communication systems
• Low power serial interface transceivers
• Line repeaters for extended cable distances
• Level translation between different voltage domains

Drivers, Receivers, Transceivers Procurement Notes

Verify the specific ordering suffix to confirm the package type and operating temperature range. The IN8 designation corresponds to the industrial grade (-40°C to +85°C) in an 8-lead plastic DIP package. Confirm RoHS compliance status and ensure the component matches the required pinout for your PCB layout before finalizing procurement.

Drivers, Receivers, Transceivers Selection Notes

Select this component for full-duplex applications requiring separate driver and receiver paths. It is suitable for environments where bus contention protection and high ESD immunity are critical. Ensure the application does not require a shutdown pin, as this variant lacks one; consider the LTC491 if disable functionality is needed.

Drivers, Receivers, Transceivers Part Context

This part belongs to the LTC1690 family of differential driver/receiver pairs. It is pin-compatible with the SN75179 and the older LTC490 models, facilitating direct upgrades or replacements in existing designs. The series focuses on low power consumption while maintaining robust fault protection capabilities.

Drivers, Receivers, Transceivers Replacement Considerations

The LTC490 is a pin-compatible alternative within the same manufacturer's portfolio. For designs requiring a shutdown control pin, the LTC491 serves as a functional replacement. Verify that any substitute maintains the required fail-safe characteristics and ESD ratings for the specific application environment.

Drivers, Receivers, Transceivers FAQ

How does the LTC1690 handle bus contention?

The device incorporates a thermal shutdown circuit that limits the short-circuit current to a maximum of 250mA. If the die temperature exceeds approximately 150°C due to a short, the driver outputs enter a high-impedance state until the temperature drops, protecting the component from damage.

What is the common mode voltage range?

The receiver inputs can withstand the entire RS-485 common mode range of -7V to +12V without damage, allowing for ground differences of up to 19V between devices on the data line.

Does the receiver have a fail-safe feature?

Yes, the receiver is designed to guarantee a high output state when the inputs are left floating, shorted together, or terminated with no signal present, without requiring external components.