LTC4306 datasheet(5/16 Pages) LINER

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LTC4318

4318fa

For more information www.linear.com/LTC4318

Typical perForMance characTerisTics

SDAOUT Fall Delay vs Bus

Capacitance

SDAOUT Fall Time vs

Temperature

SDAOUT Fall Time vs Bus

Capacitance

TA = 25°C, VCC = 3.3V unless otherwise noted.

pin FuncTions

XORL1/XORL2: Translator XOR Lower Nibble Configura-

tion Input. The DC voltage at this pin configures the lower

4-bit nibble of the address translation byte. Tie the pin to

an external resistive divider connected between VCC and

GND to set the desired DC voltage.

XORH1/XORH2: Translator XOR Upper Nibble Configura-

tion Input. The DC voltage at this pin configures the upper

3-bit nibble of the address translation byte. Tie the pin to

an external resistive divider connected between VCC and

GND to set the desired DC voltage. Connect this pin to VCC

to activate pass-through mode. See Application Informa-

tion section for more details.

ENABLE1/ENABLE2: Enable Input. If ENABLE pin is low,

the address translation is disabled, SDAIN is disconnected

from SDAOUT, and SCLIN is disconnected from SCLOUT.

A low to high transition on ENABLE restarts the configura-

tion of the address translation byte and also enables the

address translation. Connect to VCC if unused.

Exposed Pad: Exposed pad may be left open or connected

to device GND.

GND: Device Ground.

READY1/READY2: Ready Status Output. This is an open

drain output to indicate that the device is ready for address

translation. The pin releases high when the LTC4318 has

completed configuration of the address translation byte,

SDAIN is connected to SDAOUT and SCLIN is connected

to SCLOUT. Connect a pull-up resistor, typically 10k, from

this pin to the bus pull-up supply. Leave open or tie to

GND if unused.

SCLIN1/SCLIN2: Input Bus Clock Input and Output. Con-

nect this pin to the SCL line on the master side. An external

pull-up resistor or current source is required. Connect to

VCC through a pull-up resistor if unused.

SCLOUT1/SCLOUT2: Output Bus Clock Input and Output.

ConnectthispintotheSCLlineontheslaveside.Anexternal

pull-up resistor or current source is required. Connect to

VCC through a pull-up resistor if unused.

SDAIN1/SDAIN2:InputBusDataInputandOutput.Connect

this pin to the SDA line on the master side. An external

pull-up resistor or current source is required. Connect to

VCC through a pull-up resistor if unused.

SDAOUT1/SDAOUT2: Output Bus Data Input and Output.

Connect this pin to the SDA line on the slave side. An

external pull-up resistor or current source is required.

Connect to VCC through a pull-up resistor if unused.

VCC: Power Supply Input (2.25V to 5.5V). If the supply

voltages for the input and output buses are different, con-

nect this pin to the lower supply. If the input and output

supplies have the same nominal value and with tolerance

less than or equal to ±10%, connect VCC to either supply.

Bypass with at least 0.1µF to GND.

CBUS (pF)

300

250

275

150

200

175

225

125

100

200

600

400

800

4318 G07

1000

VCC = 3.3V

VCC = 5V

VCC = 2.25V

TEMPERATURE (°C)

–50

120

100

–25

4318 G08

100

C = 100pF

VCC = 5V

VCC = 2.25V

VCC = 3.3V

CBUS (pF)

120

100

200

600

400

800

4318 G09

1000

VCC = 5V

VCC = 2.25V

VCC = 3.3V

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