4

LTC4301

4301fb

PI FU CTIO S

CS (Pin 1): The connection sense pin is a 1.4V threshold

digital input pin. For normal operation CS is grounded.

Driving CS above the 1.4V threshold isolates SDAIN from

SDAOUT and SCLIN from SCLOUT and asserts READY

low.

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

the SCL bus on the card.

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

on the bus backplane.

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

for best results.

READY (Pin 5): The READY pin is an open drain N-channel

MOSFET output which pulls down when CS is high or

when the start-up sequence described in the Operation

section has not been completed. READY goes high when

CS is low and a start-up is complete.

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

SDA bus on the backplane.

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

the SDA bus on the card.

of at least 0.01

Exposed Pad (Pin 9): Exposed pad may be left open or

connected to device ground.

BLOCK DIAGRA

CONNECT PRECHARGE

CONNECT

PRECHARGE

CONNECT

CONNECT

1

R2

200k

R1

200k

R3

200k

R4

200k

PRECHARGE

LOGIC

PRECHARGE

CONNECT

95

µs

DELAY

UVLO

1.4V

CS

1.8V

3

SCLIN

6

SDAIN

1.8V

CONNECT

CONNECT

7

SDAOUT

8

2

SCLOUT

READY

5

GND

4301 BD

4

LTC4301 Supply Independent 2-Wire Bus Buffer