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LTC1694-1CS5 Datasheet

  • LTC1694-1CS5

  • SMBus/I2C Accelerator

  • 154.58KB

  • 8頁

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LTC1694-1
SMBus/I
2
C Accelerator
FEATURES
s
s
DESCRIPTIO
s
s
s
s
Improves SMBus/I
2
C
TM
Rise Time Transition
Ensures Data Integrity with Multiple Devices
on the SMBus/I
2
C
Improves Low State Noise Margin
Wide Supply Voltage Range: 2.7V to 6V
Tiny 5-Pin SOT-23 Package
Parallel Multiple LTC1694-1 Devices
for Increased Drive
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 LTC
廬
1694-1 is a dual SMBus active pull-up designed
to enhance data transmission speed and reliability under
all specified SMBus loading conditions. The LTC1694-1 is
also compatible with the Philips I
2
C Bus.
The LTC1694-1 allows multiple device connections or a
longer, more capacitive interconnect, without compro-
mising slew rates or bus performance, by supplying a high
pull-up current of 2.2mA to slew the SMBus or I
2
C lines
during positive bus transitions
During negative transitions or steady DC levels, the
LTC1694-1 sources zero current. External resistors, one
on each bus line, trigger the LTC1694-1 during positive
bus transitions and set the pull-down current level. These
resistors determine the slew rate during negative bus
transitions and the logic low DC level.
The LTC1694-1 is available in a 5-pin SOT-23 package.
, 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
1
V
CC
2
GND
SMBus2
SMBus1
LTC1694-1
5
V
CC
5V
Comparison of SMBus Waveforms for
the LTC1694-1 vs Resistor Pull-Up
4
R
P1
R
P2
SCL
SMBus SDA
LTC1694-1
1V/DIV
CLK
IN
CLK
OUT
DEVICE 1
DATA
IN
DATA
OUT
CLK
IN
CLK
OUT
DEVICE N
DATA
IN
DATA
OUT
V
CC
= 5V
C
LD
= 200pF
f
SMBus
= 100kHz
1碌s/DIV
1694-1 TA02
1694-1 TA01
LTC1694-1: Patent Pending
U
R
PULL-UP
= 15.8k
U
U
1

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