PI4MSD5V9545A Datasheet, PDF (1/13 Pages) Pericom Semiconductor Corporation – 4 Channel I2C bus Switch

PI4MSD5V9545A
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4 Channel I2C bus Switch with Interrupt Logic and Reset
Features
 1-of-4 bidirectional translating multiplexer
 I2C-bus interface logic
 Operating power supply voltage :1.65 V to 5.5 V
 Allows voltage level translation between 1.2V,
Description
The PI4MSD5V9545A is a quad 1-of-4 bidirectional
translating switch, controlled via the I2C bus. The
SCL/SDA upstream pair fans out to four SCx/SDx
downstream pairs, or channels.
1.8V,2.5 V, 3.3 V and 5 V buses
 Low standby current
 Low Ron switches
 Channel selection via I2C bus
 Power-up with all multiplexer channels deselected
 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-
Any individual SCx/SDx channel or combination of
channels can be selected, determined by the contents of
the programmable control register. Four interrupt inputs,
INT0 to INT3, one for each of the downstream pairs, are
provided. One interrupt output, INT, acts as an AND of
the four interrupt inputs.
An active LOW reset input allows the PI4MSD5V-
9545A to recover from a situation where one of the
downstream 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
A114, and 1000 V CDM per JESD22-C101
 Latch-up testing is done to JEDEC Standard
internal power-on reset function.
The pass gates of the switches are constructed such
JESD78 which exceeds 100 mA
 Packages offered: TSSOP-20L
that the VCC pin can be used to limit the maximum high
voltage which will be passed by the PI4MSD5V9545A.
This allows the use of different bus voltages on each pair,
so that 1.2V,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
Pin Configuration
are 5 V tolerant.
TSSOP20
2015-07-0036
PT0526-4 8/18/15
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