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LTC4307-1

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

Linear Technology 

LTC4307-1

High Definition Multimedia

Interface (HDMI) Level-

Shifting 2-Wire Bus Buffer

FEATURES

■ Bidirectional Buffer for Display Data Channel (DDC)

■ Compliant with HDMI Specification Version 1.3

DDC Capacitance Requirement

■ Level Translation Between 3.3V and 5V

■ ±5kV Human Body Model ESD Protection

■ 60mV Buffer Offset Independent of Load

■ Compatible with Non-Compliant VOL I2C Devices

■ Isolates Input SDA and SCL Line from Output

■ Compatible with I2CTM, I2C Fast Mode and SMBus

■ READY Open-Drain Output

■ High Impedance SDA, SCL Pins for VCC = 0V

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

Packages

U

APPLICATIO S

■ HDMI

■ 3.3V/5V Level Translation

■ Capacitance Buffer/Bus Extender

DESCRIPTIO

The LTC4307-1 is a 2-wire bus buffer that provides ca-

pacitance buffering between input and output. The HDMI

specification requires that devices have less than 50pF of

input capacitance on their DDC bus lines. The LTC4307-1’s

capacitance buffering feature, in conjunction with its

sub-10pF data and clock input capacitance, allows HDMI

components to easily meet the 50pF requirement and

tolerate high capacitance on the internal bus.

The LTC4307-1 also provides level-shifting between 3.3V

and 5V systems to allow lower voltage HDMI transmitters,

receivers and EEPROM to interface to the 5V DDC bus.

READY is an open-drain digital output flag that indicates

whether or not the input and output busses are connected

and can interface to the HDMI hot plug detect (HPD) signal.

When driven high, the ENABLE digital input allows the

LTC4307-1 to connect after a stop bit or bus idle. Driving

ENABLE low breaks the connection between the input and

output busses.

, 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 7032051, 6356140, 6650174

TYPICAL APPLICATIO

DVD PLAYER (SOURCE)

TV (SINK)

HDMI TX

IC

5V

1.8k 1.8k

EEPROM

HDMI

CABLE

<50pF

DDC GROUND

3.3V

0.1μF

LTC4307-1

VCC

SDAIN SDAOUT

SCLIN SCLOUT

ENABLE

GND

10k 10k

HDMI RX

IC

μC

43071 TA01a

Rising Edge from Asserted Low

1000

800

600

LOW

OFFSET

400

SDAOUT

SDAIN

200

0

0 100 200 300 400 500 600

100ns/DIV

43071 TA01b

43071fa

1

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