LTC4304IMS datasheet(5/16 Pages) LINER

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LTC4304

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

to VCC to disable all four accelerators. Connect ACC to

GND to enable all four accelerators. Float ACC to enable

the SDAOUT and SCLOUT accelerators only. For applica-

tions when VCC is greater than the bus pull-up voltage,

connect ACC to VCC.

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.

Connect a resistor of 10k to VCC to provide the pull-up.

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.

Connect a 10k resistor from this pin to VCC to provide

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.

VCC (Pin 10): Supply Voltage Input. Place a bypass capaci-

tor of at least 0.01µF close to VCC for best results.

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

left open or connected to the ground plane.

PI FU CTIO S

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