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LTC1694

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Improves SMBus Rise Time Transition

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Ensures Data Integrity with Multiple Devices

on the SMBus

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Improves Low State Noise Margin

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Auto Detect Low Power Standby Mode

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Wide Supply Voltage Range: 2.7V to 6V

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Tiny 5-Pin SOT-23 Package

The LT C

enhance data transmission speed and reliability under all

specified SMBus loading conditions. The LTC1694 is also

The LTC1694 allows multiple device connections or a

longer, more capacitive interconnect, without compro-

mising 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 cur-

rent sources decrease to 275

µA 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.

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Notebook and Palmtop Computers

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Portable Instruments

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Battery Chargers

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Industrial Control Application

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TV/Video Products

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ACPI SMBus Interface

LTC1694

GND

5V

C1

0.1

µF

SMBus1

SMBus2

1

2

5

4

SCL

SDA

DEVICE 1

CLK

IN

CLK

OUT

SMBus

DATA

IN

DATA

OUT

DEVICE N

1694 TA01

CLK

IN

CLK

OUT

DATA

IN

DATA

OUT

, LTC and LT are registered trademarks of Linear Technology Corporation.

1

µs/DIV

1694 TA02

Comparison of SMBus Waveforms for

the LTC1694 vs Resistor Pull-Up

LTC1694

= 15.8k

LTC1694: Patent Pending

FEATURES

DESCRIPTIO

APPLICATIO S

TYPICAL APPLICATIO

1V/DIV