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LTC4300A-1/LTC4300A-2

sn4300a12 4300a12fs

ENABLE/VCC2 (Pin 1): Chip Enable Pin/Card Supply Volt-

age. For the LTC4300A-1, this is a digital CMOS threshold

input pin. Grounding this pin puts the part in a low current

(<1

µA) mode. It also disables the rise-time accelerators,

disables the bus precharge circuitry, drives READY low,

isolates SDAIN from SDAOUT and isolates SCLIN from

SCLOUT. Drive ENABLE all the way to VCC for normal

operation. Connect ENABLE to VCC if this feature is not

being used. For the LTC4300A-2, this is the supply voltage

for the devices on the card I2C busses. Connect pull-up

resistors from SDAOUT and SCLOUT to this pin. Place a

bypass capacitor of at least 0.01

µFclosetothispinforbest

results.

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 the

SCL bus on the backplane.

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

for best results.

READY/ACC (Pin 5): Connection Flag/Rise-Time Accel-

erator Control. For the LTC4300A-1, this is an open-drain

NMOS output which pulls low when either ENABLE is low

or the start-up sequence described in the Operation sec-

tion has not been completed. READY goes high when

ENABLE is high and start-up is complete. Connect a 10k

resistor from this pin to VCC to provide the pull up. For the

LTC4300A-2, this is a CMOS threshold digital input pin

that enables and disables the rise-time accelerators on all

four SDA and SCL pins. Drive ACC all the way to the VCC2

supply voltage to enable all four accelerators; drive ACC to

ground to turn them off.

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.

VCC (Pin 8): Main Input Power Supply from Backplane.

This is the supply voltage for the devices on the backplane

I2C busses. Connect pull-up resistors from SDAIN and

SCLIN (and also from SDAOUT and SCLOUT for the

LTC4300A-1) to this pin. Place a bypass capacitor of at

least 0.01

µF close to this pin for best results.

PI FU CTIO S

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