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LTC4311

Low Voltage I2C/SMBus Accelerator

Linear Technology 

LTC4311

Low Voltage I2C/SMBus

Accelerator

FEATURES

■ Improves I2C Bus Rise Time Transition

■ Ensures Data Integrity with Multiple Devices on the

I2C 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

DESCRIPTION

The LTC®4311 is a dual I2C active pull-up designed to

enhance data transmission speed and reliability for bus

loading conditions well beyond the 400pF I2C 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 I2C 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.

TYPICAL APPLICATION

VCC

2.5V

C1

0.01μF

I2C

SCL

SDA

CLK

IN

CLK

OUT

DEVICE 1

LTC4311

VCC

BUS1

ENABLE

GND

BUS2

DATA

IN

DATA

OUT

VCC

2.5V

10k 10k

CLK

IN

CLK

OUT

DEVICE N

DATA

IN

DATA

OUT

4311 TA01a

Comparison of I2C Waveforms for

the LTC4311 vs Resistor Pull-Up

1V/DIV

LTC4311

RPULL-UP = 15.8k

VCC = 5V

CLD = 200pF

fI2C = 100kHz

1μs/DIV

4311 TA01b

4311fa

1

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