LTC4313-1/LTC4313-2/

LTC4313-3

1

4313123f

Typical applicaTion

FeaTures

DescripTion

2-Wire Bus Buffers with

High Noise Margin

that provides bidirectional buffering while maintain-

ing a low offset voltage and high noise margin up to

allows multiple LTC4313s to be cascaded. The LTC4313-1

andLTC4313-2supportleveltranslationbetween3.3Vand

5V busses. In addition to these voltages, the LTC4313-3

also supports level translation to 1.5V, 1.8V and 2.5V.

Duringinsertion,theSDAandSCLlinesarepre-chargedto

1Vtominimizebusdisturbances.Connectionisestablished

between the input and output after ENABLE is asserted

high and a stop bit or bus idle condition has been detected

on the SDA and SCL pins.

If both data and clock are not simultaneously high at least

once in 45ms, the input is disconnected from the output.

Up to 16 clock pulses are subsequently generated to free

thestuckbus.Risetimeaccelerators(RTAs)providepull-up

currents on SDA and SCL rising edges to meet rise time

specifications in heavily loaded systems. The RTAs are

configured as slew limited switches in the LTC4313-1 and

2.5mA current sources in the LTC4313-2. The LTC4313-3

does not have RTAs.

L

, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and

Hot Swap is a trademark of Linear Technology Corporation. All other trademarks are the

property of their respective owners. Protected by U.S. Patents, including 6356140, 6650174,

7032051, 7478286.

400kHz Operation

applicaTions

n

Bidirectional Buffer Increases Fanout

n

n

n

Strong (LTC4313-1) and 2.5mA (LTC4313-2)

Rise Time Accelerator Current

n

Level Shift 1.5V, 1.8V, 2.5V, 3.3V and 5V Busses

n

Prevents SDA and SCL Corruption During Live Board

Insertion and Removal from Backplane

n

Stuck Bus Disconnect and Recovery

n

n

±4kV Human Body Model ESD Ruggedness

n

High Impedance SDA, SCL Pins When Unpowered

n

8-Lead MSOP and 8-Lead (3mm × 3mm) DFN

Packages

n

Capacitance Buffers/Bus Extender

n

Live Board Insertion

n

Telecommunications Systems Including ATCA

n

Level Translation

n

PMBus

n

Servers

LTC4313-1

GND

4313123 TA01a

READY

SCLOUT

SDAOUT

ENABLE

SCLIN

SDAIN

SCL1

SDA1

2.7k

2.7k

0.01µF

3.3V

READY

SCL2

SDA2

1.3k

10k

5V

1.3k

500ns/DIV

4313123 TA01b

SCLOUT

SCLIN