PI4MSD5V9544A

Description

The PI4MSD5V9544A is a 1-of-4 bidirectional translating multiplexer, controlled via the I²C bus. The SCL/SDA upstream pair fans out to four SCx/SDx downstream pairs, or channels.
Only one SCx/SDx channel is selected at a time, determined by the contents of the programmable control register. Four interrupt inputs, INT0 to INT3, one for each of the SCx/SDx downstream pairs, are provided.
One interrupt output, INT, which acts as an AND of the four interrupt inputs, is provided.
A power-on reset function puts the registers in their default state and initializes the I2C bus state machine with no channels selected. The pass gates of the multiplexer are constructed such that the VCC pin
can be used to limit the maximum high voltage which will be passed by the PI4MSD5V9544A. This allows the use of different bus voltages on each SCx/SDx pair, so that 1.2V,1.8 V, 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.

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, 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-A114, and 1000 V CDM per JESD22-C101
• Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100 mA
• Packages offered: TSSOP-20L