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LTC4307I

Low Offset Hot Swappable 2-Wire Bus Buffer with Stuck Bus Recovery

Linear Technology 

LTC4307

PI FU CTIO S

ENABLE (Pin 1): Connection Enable Input. This is a 1.4V

digital threshold input pin. For normal operation pull or tie

ENABLE high. Driving ENABLE below 0.8V isolates SDAIN

from SDAOUT, SCLIN from SCLOUT and asserts READY

low. A rising edge on ENABLE after a fault has occurred

forces a connection between SDAIN, SDAOUT and SCLIN,

SCLOUT. Connect to VCC if unused.

SCLOUT (Pin 2): Serial Clock Output. Connect this pin to

an SCL bus segment where stuck bus recovery is needed.

A pull-up resistor should be connected between this pin

and VCC.

SCLIN (Pin 3): Serial Clock Input. Connect this pin to an

SCL bus segment that needs to be isolated from stuck

bus problems. A pull-up resistor should be connected

between this pin and VCC.

GND (Pin 4): Device Ground. Connect this pin to a ground

plane for best results.

READY (Pin 5): Connection READY Status Output. The

READY pin is an open-drain N-channel MOSFET output that

pulls low when ENABLE is low, or when the start-up and

connection sequence described in the Operation section

has not been completed. READY also goes low when the

LTC4307 disconnects the inputs from the outputs due to

the bus being stuck low for at least 30ms. READY goes high

when ENABLE is high and a connection is made. Connect

a pull-up resistor, typically 10k, from this pin to VCC to

provide the pull-up. This pin can be floated if unused.

SDAIN (Pin 6): Serial Data Input. Connect this pin to an

SDA bus segment that needs to be isolated from stuck

bus problems. A pull-up resistor should be connected

between this pin and VCC.

SDAOUT (Pin 7): Serial Data Output. Connect this pin

to the SDA bus segment where stuck bus recovery is

needed. A pull-up resistor should be connected between

this pin and VCC.

VCC (Pin 8): Supply Voltage Input. Place a bypass capacitor

of at least 0.01μF close to VCC for best results.

Exposed Pad (Pin 9, DFN Package Only): Exposed Pad

may be left open or connected to device ground.

4307f

6

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