LTC1694-1CS5#TRPBF

Signal Buffers, Repeaters, Splitters Overview

The LTC1694-1CS5#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 inactive. The device provides a maximum pull-up current of 2.2mA during positive bus transitions, ensuring a maximum rise time of 1.0ms with a bus capacitance of 200pF. Designed for Standard Mode I2C and SMBus applications, it supports a maximum operating frequency of 100kHz. The component is housed in a 5-lead TSOT-23 package and functions within an ambient temperature range of 0°C to 70°C.

Signal Buffers, Repeaters, Splitters Feature Summary

• Dual-channel active pull-up architecture designed to enhance data transmission speed and reliability under specified loading conditions.
• Provides high pull-up current specifically during positive bus transitions while sourcing zero current during negative transitions or steady DC levels.
• Compatible with both Philips I2C Bus and SMBus protocols, improving low state noise margins and slew rates.
• Capable of parallel connection to increase drive capability for systems requiring higher pull-up currents.

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 CS5 indicates the commercial temperature grade (0°C to 70°C) rather than the industrial grade IS5 (-40°C to 85°C). Confirm the TRPBF designation corresponds to tape and reel packaging compliant with RoHS standards. Ensure the ordering part number matches the required package type, which is the 5-lead plastic TSOT-23.

Signal Buffers, Repeaters, Splitters Selection Notes

Select this component when standard resistive pull-ups result in excessive rise times due to high bus capacitance. The external resistor values must be calculated to trigger the internal slew rate detector threshold of 0.5V/ms. Consider paralleling multiple units if the total bus capacitance exceeds 200pF to maintain the maximum rise time specification.

Signal Buffers, Repeaters, Splitters Part Context

This part belongs to the LTC1694 family of SMBus/I2C accelerators. The 'C' suffix denotes the commercial temperature range variant, distinguishing it from the 'I' suffix industrial version. The device serves as a signal buffer and repeater, addressing limitations of passive pull-up networks in multi-device bus configurations.

Signal Buffers, Repeaters, Splitters Replacement Considerations

LTC1694-1IS5#TRPBF: Industrial temperature grade equivalent.

Signal Buffers, Repeaters, Splitters FAQ

How does the LTC1694-1 manage power consumption during steady states?

The device sources zero current during negative transitions or steady DC levels, drawing only a typical standby supply current of 45µA when the bus lines are inactive.

What determines the activation of the active pull-up current?

The pull-up current activates when the SMBus line voltage exceeds the comparator threshold of 0.65V and the positive slew rate exceeds the detector threshold of 0.5V/ms.