Datasheet

4
LTC4301
4301fb
UU
U
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.
V
CC
(Pin 8): Main Input Supply. Place a bypass capacitor
of at least 0.01µF close to V
CC
for best results.
Exposed Pad (Pin 9): Exposed pad may be left open or
connected to device ground.
BLOCK DIAGRA
W
CONNECT
PRECHARGE
CONNECT
PRECHARGE
CONNECT
CONNECT
1
R2
200k
R1
200k
R3
200k
R4
200k
PRECHARGE
LOGIC
PRECHARGE
CONNECT
95µs
DELAY
UVLO
1.4V
CS
1.8V
3
SCLIN
6
SDAIN
1.8V
CONNECT
CONNECT
7
SDAOUT
8
V
CC
2
SCLOUT
READY
5
GND
4301 BD
4
LTC4301 Supply Independent 2-Wire Bus Buffer