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LTC4306I

4-Channel, 2-Wire Bus Multiplexer with Capacitance Buffering

Linear Technology 

LTC4306

4-Channel,

2-Wire Bus Multiplexer with

Capacitance Buffering

FEATURES

■ 1:4 2-Wire Multiplexer/Switch

■ Connect SDA and SCL Lines with 2-Wire Bus

Commands

■ Supply Independent Bidirectional Buffer for SDA

and SCL Lines Increases Fan-Out

■ Programmable Disconnect from Stuck Bus

■ Compatible with I2C and SMBus Standards

■ Rise Time Accelerator Circuitry

■ SMBus Compatible ALERT Response Protocol

■ Two General Purpose Inputs-Outputs

■ Prevents SDA and SCL Corruption During Live Board

Insertion and Removal from Backplane

■ ±10kV Human Body Model ESD Ruggedness

■ 24-Lead QFN (4mm × 5mm) and SSOP Packages

U

APPLICATIO S

■ Nested Addressing

■ 5V/3.3V Level Translator

■ Capacitance Buffer/Bus Extender

DESCRIPTIO

The LTC®4306 is a 4-channel, 2-wire bus multiplexer with

bus buffers to provide capacitive isolation between the

upstream bus and downstream buses. Through software

control, the LTC4306 connects the upstream 2-wire bus to

any desired combination of downstream buses. Each

channel can be pulled up to a supply voltage ranging from

2.2V to 5.5V, independent of the LTC4306 supply voltage.

The downstream channels are also provided with

ALERT1-ALERT4 inputs for fault reporting.

Programmable timeout circuitry disconnects the down-

stream buses if the bus is stuck low. When activated, rise

time accelerators source currents into the 2-wire bus pins

to reduce rise time. Driving the ENABLE pin low restores

all features to their default states. Three address pins

provide 27 distinct addresses.

The LTC4306 is available in 24-lead QFN (4mm × 5mm)

and SSOP packages.

, LTC and LT are registered trademarks of Linear Technology Corporation.

All other trademarks are the property of their respective owners. Patent pending.

TYPICAL APPLICATIO

A Level Shifting and Nested Addressing Application

2.5V

3.3V

MICRO-

CONTROLLER

10k 10k 10k

0.01µF

10k 10k 10k

VCC

SCLIN SCL1

SDAIN SDA1

ALERT ALERT1

LTC4306

•

•

•

SFP

MODULE 1

ADDRESS = 1111 000

5V

10k 10k 10k

ADR2 SCL4

ADR1 SDA4

ADR0 ALERT4

GND

4306 TA01a

ADDRESS = 1000 100

SFP

MODULE 4

ADDRESS = 1111 000

VCC = 3.3V

SCLIN

2V/DIV

SCL1

2V/DIV

SCL4

2V/DIV

I2C Bus Waveforms

VBACK = 2.5V

VCARD1 = 3.3V

VCARD4 = 5V

500ns/DIV

4306 TA01b

4306f

1

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