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LTC1694CS5 Datasheet

  • LTC1694CS5

  • SMBus/I2C Accelerator

  • 149.54KB

  • 8頁

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LTC1694
SMBus/I
2
C Accelerator
FEATURES
s
s
DESCRIPTIO
s
s
s
s
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
Tiny 5-Pin SOT-23 Package
APPLICATIO S
s
s
s
s
s
s
Notebook and Palmtop Computers
Portable Instruments
Battery Chargers
Industrial Control Application
TV/Video Products
ACPI SMBus Interface
The LT C
廬
1694 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 I
2
C
TM
Bus.
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碌A(chǔ) 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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
I
2
C is a trademark of Philips Electronics N.V.
TYPICAL APPLICATIO
V
CC
5V
C1
0.1碌F
Comparison of SMBus Waveforms for
the LTC1694 vs Resistor Pull-Up
1
V
CC
2
GND
SMBus2
SMBus1
LTC1694
4
5
LTC1694
SCL
SMBus
SDA
1V/DIV
DATA
IN
DATA
OUT
CLK
IN
CLK
OUT
DEVICE N
1694 TA01
CLK
IN
CLK
OUT
DEVICE 1
DATA
IN
DATA
OUT
V
CC
= 5V
C
LD
= 200pF
f
SMBus
= 100kHz
LTC1694: Patent Pending
U
R
PULL-UP
= 15.8k
1碌s/DIV
1694 TA02
U
U
1

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