LTC4311 datasheet(5/20 Pages) LINER

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LTC4313-1/LTC4313-2/

LTC4313-3

4313123f

pin FuncTions

ENABLE (Pin 1): Connection Enable Input. When driven

low, the ENABLE pin isolates SDAIN and SCLIN from

SDAOUT and SCLOUT, asserts READY low, disables

rise time accelerators and inhibits automatic clock and

stop bit generation during a stuck low fault condition.

When driven high, the ENABLE pin connects SDAIN and

SCLIN to SDAOUT and SCLOUT after a stop bit or bus idle

has been detected on both busses. Driving ENABLE high

also enables automatic clock generation during a stuck

low fault condition. During a stuck low fault condition, a

risingedgeontheENABLEpinforcesaconnectionbetween

SDAIN and SDAOUT and SCLIN and SCLOUT. When using

the LTC4313 in a Hot Swap™ application with staggered

connector pins, connect a 10k resistor between ENABLE

and GND to ensure correct functionality. Connect to VCC

if unused.

SCLOUT (Pin 2): Serial Bus 2 Clock Input/Output. Connect

this pin to the SCL bus segment where stuck low recovery

is desired. Connect an external pull-up resistor or current

sourcebetweenthispinandthebussupply.Thebussupply

needs to be ≥ VCC for the LTC4313-1 and LTC4313-2, but

not for the LTC4313-3. Refer to the Applications Informa-

tion section for more details. Do not leave open.

SCLIN (Pin 3): Serial Bus 1 Clock Input/Output. Connect

this pin to the SCL line on the upstream bus. Connect

an external pull-up resistor or current source between

this pin and the bus supply. The bus supply needs to be

≥ VCC for the LTC4313-1 and LTC4313-2, but not for the

LTC4313-3. Refer to the Applications Information section

for more details. Do not leave open.

GND (Pin 4): Device Ground.

READY (Pin 5): Connection Ready Status Output. This

open drain N-channel MOSFET output pulls low when

the input and output sides are disconnected. READY is

pulled high when ENABLE is high and a connection has

been established between the input and output. Connect

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

pull-up supply. Leave open or tie to GND if unused.

SDAIN (Pin 6): Serial Bus 1 Data Input/Output. Connect

this pin to the SDA line on the upstream bus. Connect an

externalpull-upresistororcurrentsourcebetweenthispin

and the bus supply. The bus supply needs to be ≥ VCC for

the LTC4313-1 and LTC4313-2, but not for the LTC4313-3.

Refer to the Applications Information section for more

details. Do not leave open.

SDAOUT (Pin 7): Serial Bus 2 Data Input/Output. Connect

this pin to the SDA bus segment where stuck low recovery

is desired. Connect an external pull-up resistor or current

sourcebetweenthispinandthebussupply.Thebussupply

needs to be ≥ VCC for the LTC4313-1 and LTC4313-2, but

not for the LTC4313-3. Refer to the Applications Informa-

tion section for more details. Do not leave open.

VCC (Pin 8): Power Supply Voltage. Power this pin from

a supply between 2.9V and 5.5V. Bypass with at least

0.01µF to GND.

Exposed Pad (Pin 9, DD8 Package Only): Exposed pad

may be left open or connected to device GND.

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