LTC4304

5

4304fa

ENABLE (Pin 1): Connection Enable. This is a digital

threshold input pin. For normal operation ENABLE is high.

Driving ENABLE below 0.8V isolates SDAIN from SDAOUT,

SCLIN from SCLOUT, asserts READY low and disables

automatic clocking. A rising edge on ENABLE after a fault

has occurred unconditionally forces a connection between

SDAIN, SDAOUT and SCLIN, SCLOUT.

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.

ACC (Pin 4): Rise-Time Accelerator Control. Connect ACC

GND to enable all four accelerators. Float ACC to enable

the SDAOUT and SCLOUT accelerators only. For applica-

GND (Pin 5): Device Ground. Connect this pin to a ground

plane for best results.

READY (Pin 6): Connection Status Flag. READY provides

a digital flag which indicates the status of the connection

circuitry described in the “Connection Circuitry” section.

FAULT (Pin 7): Bus Stuck Low Fault. FAULT is an open

drain N-channel MOSFET which pulls low to signal a bus

stuck low condition. In normal operation, FAULT is high.

the pull-up.

SDAIN (Pin 8): Serial Data Input. Connect this pin to the

SDA bus on the backplane.

SDAOUT (Pin 9): Serial Data Output. Connect this pin to

the SDA bus on the card.

Exposed Pad (Pin 11, DFN Only): Exposed pad may be

left open or connected to the ground plane.

PI FU CTIO S