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LTC4307-1

High Defi nition Multimedia Interface (HDMI) Level-Shifting 2-Wire Bus Buffer

Linear Technology 

LTC4307-1

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

the clock line of a DDC bus. A pull-up resistor should be

connected between this pin and a supply voltage greater

than or equal to the VCC voltage.

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

the clock line of a DDC bus. A pull-up resistor should be

connected between this pin and a supply voltage greater

than or equal to the VCC voltage.

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 goes high when ENABLE

is high and a connection is made. READY can be used to

control the HDMI HPD signal. 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 the

data line of a DDC bus. A pull-up resistor should be con-

nected between this pin and a supply voltage greater than

or equal to the VCC voltage.

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

the data line of a DDC bus. A pull-up resistor should be

connected between this pin and a supply voltage greater

than or equal to the VCC voltage.

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.

43071fa

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