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LTC4311ISC6-TRPBF

Description
Low Voltage I2C/SMBus Accelerator
File Size135KB,12 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
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LTC4311ISC6-TRPBF Overview

Low Voltage I2C/SMBus Accelerator

LTC4311
Low Voltage I
2
C/SMBus
Accelerator
FEATURES
DESCRIPTION
The LTC
®
4311 is a dual I
2
C active pull-up designed to
enhance data transmission speed and reliability for bus
loading conditions well beyond the 400pF I
2
C specification
limit. The LTC4311 operates at supply voltages from 1.6V
to 5.5V and is also compatible with SMBus.
The LTC4311 allows multiple device connections or a lon-
ger, more capacitive interconnect, without compromising
slew rates or bus performance, by using two slew limited
pull-up currents.
During positive bus transitions, the LTC4311 provides slew
limited pull-up currents to quickly slew the I
2
C or SMBus
lines to the bus pull-up voltage. During negative transitions
or steady DC levels, the currents are disabled 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. When disabled, the LTC4311
goes into low (<5μA) current shutdown.
The LTC4311 is available in the 2mm
×
2mm
×
0.75mm
DFN, and SC70 packages.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All
other trademarks are the property of their respective owners. Protected by U.S. Patents
including 6356140 and 6650174.
Improves I
2
C Bus Rise Time Transition
Ensures Data Integrity with Multiple Devices on the
I
2
C Bus.
Wide Supply Voltage Range: 1.6V to 5.5V
Improves Low State Noise Margin
Up to 400kHz Operation
Auto Detect Low Power Standby Mode
Low (<5μA) Supply Current Shutdown
Does Not Load Bus When Disabled or Powered Down
Strong Slew Limited Pull-up Current
±8kV Human Body Model ESD Ruggedness
2mm
×
2mm DFN and SC70 Packages
APPLICATIONS
Notebook and Palmtop Computers
Portable Instruments
Battery Chargers
Industrial Controls
TV/Video Products
ACPI SMBus Interface
TYPICAL APPLICATION
V
CC
2.5V
V
CC
C1
0.01μF
ENABLE
GND
I
2
C
SCL
SDA
CLK
IN
CLK
OUT
DEVICE 1
DATA
IN
DATA
OUT
CLK
IN
CLK
OUT
DEVICE N
4311 TA01a
LTC4311
BUS1
V
CC
2.5V
Comparison of I
2
C Waveforms for
the LTC4311 vs Resistor Pull-Up
10k
BUS2
10k
1V/DIV
LTC4311
DATA
IN
DATA
OUT
V
CC
= 5V
C
LD
= 200pF
f
I
2
C
= 100kHz
R
PULL-UP
= 15.8k
1μs/DIV
4311 TA01b
4311fa
1

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