PI4MSD5V9547 Datasheet, PDF (1/13 Pages) Pericom Semiconductor Corporation – 8 Channel I2C bus multiplexer

PI4MSD5V9547
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8 Channel I2C bus multiplexer with Reset
Features
 1-of-8 bidirectional translating multiplexer
 I2C-bus interface logic
 Operating power supply voltage from 1.65V to
5.5V
 Allows voltage level translation between 1.2V,
1.8V,2.5 V, 3.3 V and 5 V buses
 Low standby current
 Low Ron switches
 Active LOW reset input
 Channel selection via I2C bus
 Power-up with one channel on
 Capacitance isolation when channel disabled
 No glitch on power-up
 Supports hot insertion
 5 V tolerant inputs
 0 Hz to 400 kHz clock frequency
 ESD protection exceeds 8000 V HBM per JESD22-
A114, and 1000 V CDM per JESD22-C101
 Latch-up testing is done to JEDEC Standard
JESD78 which exceeds 100 mA
 Packages offered: TSSOP-24L,TQFN-24ZD
Description
The PI4MSD5V9547 is an octal bidirectional
translating multiplexer controlled by the I2C-bus. The
SCL/SDA upstream pair fans out to eight downstream
pairs, or channels.
Only one SCx/SDx channel can be selected at a time,
determined by the contents of the programmable control
register. The device powers up with Channel 0
connected, allowing immediate communication between
the master and downstream devices on that channel.
An active LOW reset input allows the
PI4MSD5V9547 to recover from a situation where one
of the downstream I2C-buses is stuck in a LOW state.
Pulling the RESET pin LOW resets the I2C-bus state
machine and causes all the channels to be deselected as
does the internal Power-On Reset (POR) function.
The pass gates of the switches are constructed such
that the VCC pin can be used to limit the maximum high
voltage which is passed by the PI4MSD5V9547. This
allows the use of different bus voltages on each pair, so
that1.2V, 1.8 V or 2.5 V or 3.3 V parts can communicate
with 5 V parts without any additional protection.
External pull-up resistors pull the bus up to the desired
voltage level for each channel. All I/O pins are 5 V
tolerant.
Pin Configuration
TSSOP
TQFN
2015-07-0040
PT0544-2
8/18/15
1