LTC1688CS#TRPBF

Drivers, Receivers, Transceivers Overview

The LTC1688CS#TRPBF is a high-speed RS485 quad differential line driver manufactured by Analog Devices Inc. It supports data rates up to 100Mbps and operates from a single 3V or 5V supply. The device features Hot Swap capability, maintaining high impedance outputs during board insertion or power-off states. Propagation delay is guaranteed within an 8ns to 4ns window across the operating temperature range. Key electrical specifications include a typical channel-to-channel skew of 500ps, short-circuit protection with a typical output current of 3mA, and thermal shutdown protection. The component is housed in a 16-lead plastic SO package.

Drivers, Receivers, Transceivers Feature Summary

• Hot Swap capable outputs maintain backplane data integrity during board insertion and removal
• Guaranteed propagation delay window of 8ns to 4ns over the full operating temperature range
• Integrated short-circuit and thermal shutdown protection for enhanced reliability
• Outputs remain in high impedance state when powered off or disabled

Drivers, Receivers, Transceivers Applications

• High speed RS485 twisted-pair communication links
• High speed backplane drivers for point-to-point and multipoint configurations
• Complementary clock drivers requiring low skew performance
• STS-1/OC-1 data transmission systems

Drivers, Receivers, Transceivers Procurement Notes

Verify that the ordering suffix #TRPBF corresponds to the tape and reel packaging format as specified in the manufacturer's documentation. Confirm the specific grade (C or I) matches the required ambient operating temperature range for the target application environment before finalizing procurement orders.

Drivers, Receivers, Transceivers Selection Notes

Select this component for applications requiring ultrahigh speed differential signaling up to 100Mbps. Ensure the design accommodates the recommended 100Ω characteristic impedance for PCB traces or cables. Verify that the system power supply voltage aligns with the 3V or 5V operational requirements to achieve the specified data rate and performance metrics.

Drivers, Receivers, Transceivers Part Context

This part belongs to the LTC1688/LTC1689 family of ultrahigh speed differential bus drivers. The LTC1688 variant enables all four drivers simultaneously, whereas the LTC1689 allows independent enabling of two drivers at a time. Both variants share pin compatibility with legacy parts such as the LTC486 and LTC487, facilitating direct upgrades in existing designs.

Drivers, Receivers, Transceivers Replacement Considerations

The LTC1688CS is pin-compatible with the LTC486 and LTC487. Designers upgrading from these legacy components should verify that the higher speed capabilities and different enable logic of the LTC1688 do not conflict with existing control signals.

Drivers, Receivers, Transceivers FAQ

How does the LTC1688 handle hot swapping?

The driver outputs maintain a high impedance state even when the power supply is off or the device is disabled. This prevents the injection of differential signals onto the transmission line during board insertion or removal.

What is the maximum data rate supported?

The device supports data rates up to 100Mbps when operated with a 5V supply. It can also operate at 50Mbps when powered by a 3V supply.

Is short-circuit protection included?

Yes, the device includes short-circuit protection that reduces the output current to approximately 3mA during a fault condition, along with thermal shutdown circuitry to prevent damage from excessive power dissipation.