LTC1694-1IS5#TRPBF

Signal Buffers, Repeaters, Splitters Overview

The LTC1694-1IS5#TRPBF is a dual SMBus active pull-up accelerator manufactured by Analog Devices Inc. It operates within a supply voltage range of 2.7V to 6V and draws a typical supply current of 45µA when the bus lines are inactive. The device provides a typical pull-up current of 2.2mA during positive transitions, ensuring a maximum rise time of 1ms with a bus capacitance of 200pF. It supports a maximum operating frequency of 100kHz for SMBus applications. The component is housed in a 5-lead plastic TSOT-23 package and functions over an industrial temperature range of -40°C to +85°C.

Signal Buffers, Repeaters, Splitters Feature Summary

• Dual-channel architecture providing independent active pull-up currents for separate SMBus or I2C lines.
• Active pull-up mechanism delivers high current only during positive transitions to improve rise times under heavy capacitive loading.
• Zero current sourcing during negative transitions or steady DC levels to maintain low state noise margins.
• Parallel connection capability allows multiple devices to be combined for increased drive strength on high-capacitance buses.

Signal Buffers, Repeaters, Splitters Applications

• Notebook and Palmtop Computers
• Portable Instruments
• Battery Chargers
• Industrial Control Applications
• TV/Video Products

Signal Buffers, Repeaters, Splitters Procurement Notes

Verify the specific suffix IS5 confirms the extended industrial temperature range (-40°C to +85°C) compared to the C grade. Confirm the TRPBF designation indicates tape and reel packaging compliant with RoHS standards. Cross-reference the manufacturer part number with authorized distributors to ensure authenticity and traceability before finalizing procurement orders.

Signal Buffers, Repeaters, Splitters Selection Notes

Select this component when standard resistive pull-ups fail to meet rise time requirements due to high bus capacitance. Ensure external pull-up resistor values are calculated to trigger the internal slew rate detector threshold while maintaining acceptable logic low voltage levels. Consider paralleling units if the total bus capacitance exceeds 200pF to achieve necessary drive currents.

Signal Buffers, Repeaters, Splitters Part Context

This part belongs to the LTC1694 family of SMBus accelerators designed to enhance data transmission speed and reliability. Unlike the standard LTC1694 which includes AC pull-up features, the LTC1694-1 focuses on dual-channel active pull-up performance. It serves as a critical interface buffer for systems requiring robust communication over long or heavily loaded interconnects.

Signal Buffers, Repeaters, Splitters Replacement Considerations

LTC1694-1CS5#TRPBF (Commercial Temperature Grade)

Signal Buffers, Repeaters, Splitters FAQ

How does the LTC1694-1 handle negative bus transitions?

During negative transitions or steady DC levels, the LTC1694-1 sources zero current. External resistors determine the pull-down current level and logic low DC level.

What is the function of the external pull-up resistor RP?

An external pull-up resistor RP is required to supply steady-state pull-up current when the bus is at logic zero and to trigger the active pull-up circuitry during the initial portion of positive transitions.

Can multiple LTC1694-1 devices be used together?

Yes, multiple LTC1694-1 devices can be connected in parallel to provide increased pull-up current, which is useful for buses with capacitance higher than 200pF.