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TCA4311
SCPS173A – DECEMBER 2008 – REVISED JUNE 2014
TCA4311 Hot Swappable 2-Wire Bus Buffers
Not Recommended for New Designs
1 Features
2 Description
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The TCA4311 is a hot swappable I2C bus buffer that
supports I/O card insertion into a live backplane
without corruption of the data and clock busses.
Control circuitry prevents the backplane from being
connected to the card until a stop command or bus
idle occurs on the backplane without bus contention
on the card. When the connection is made, this
device provides bidirectional buffering, keeping the
backplane and card capacitances isolated. During
insertion, the SDA and SCL lines are precharged to 1
V to minimize the current required to charge the
parasitic capacitance of the chip.
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Operating Power-Supply Voltage Range of 2.7-V
to 5.5-V
Supports Bidirectional Data Transfer of I2C Bus
Signals
SDA and SCL Lines Are Buffered Which
Increases Fanout
1-V Precharge on All SDA and SCL Lines
Prevents Corruption During Live Board Insertion
and Removal From Backplane
SDA and SCL Input Lines Are Isolated From
Outputs
Accommodates Standard Mode and Fast Mode
I2C Devices
Applications Include Hot Board Insertion and Bus
Extension
Low ICC Chip Disable of
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