LTC1694

PRODUCTION

SMBus/I²C Accelerator

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Overview

  • Improves SMBus Rise Time Transition
  • Ensures Data Integrity with Multiple Devices on the SMBus
  • Improves Low State Noise Margin
  • Auto Detect Low Power Standby Mode
  • Wide Supply Voltage Range: 2.7V to 6V
  • Low Profile (1mm) SOT-23 (ThinSOT™) Package

The LTC1694 is a dual SMBus active pull-up designed to enhance data transmission speed and reliability under all specified SMBus loading conditions. The LTC1694 is also compatible with the Philips I²C™ Bus.

The LTC1694 allows multiple device connections or a longer, more capacitive interconnect, without compromising slew rates or bus performance, by using two bilevel hysteretic current source pull-ups.

During positive bus transitions, the LTC1694 current sources provide 2.2mA to quickly slew the SMBus line. During negative transitions or steady DC levels, the current sources decrease to 275µA to improve negative slew rate and improve low state noise margins. An auto detect standby mode reduces supply current if both SCL and SDA are high.

The LTC1694 is available in a 5-pin SOT-23 package, requiring virtually the same space as two surface mount resistors.

Applications

  • Notebook and Palmtop Computers
  • Portable Instruments
  • Battery Chargers
  • Industrial Control Application
  • TV/Video Products
  • ACPI SMBus Interface
LTC1694
SMBus/I²C Accelerator
Comparison of SMBus Waveforms for the LTC1694 vs Resistor Pull-Up Product Package 1
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Documentation

Data Sheet 1

Reliability Data 1

Design Note 2

Technical Articles 2

Data Sheet

This is the most up-to-date revision of the Data Sheet.

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Hardware Ecosystem

Parts Product Life Cycle Description
Interface Transceivers & Isolators 1
LTM2883
PRODUCTION SPI/Digital or I2C μModule Isolator with Adjustable ±12.5V and 5V Regulated Power
Level Translators & Buffers 1
LTC4311
PRODUCTION Low Voltage I2C/SMBus Accelerator
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