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NXP Semiconductors - 8-Channel I2C Bus Multiplexer

Numéro de référence PCA9547
Description 8-Channel I2C Bus Multiplexer
Fabricant NXP Semiconductors 
Logo NXP Semiconductors 





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PCA9547 fiche technique
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PCA9547
8-channel I2C-bus multiplexer with reset
Rev. 02 — 12 September 2006
Product data sheet
1. General description
The PCA9547 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 PCA9547 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 causing all the channels to be deselected, except Channel 0 so
that the master can regain control of the bus.
The pass gates of the multiplexers are constructed such that the VDD pin can be used to
limit the maximum high voltage which will be passed by the PCA9547. This allows the use
of different bus voltages on each pair, so that 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.
2. Features
I 1-of-8 bidirectional translating multiplexer
I I2C-bus interface logic; compatible with SMBus standards
I Active LOW RESET input
I 3 address pins allowing up to 8 devices on the I2C-bus
I Channel selection via I2C-bus, one channel at a time
I Power-up with all channels deselected except Channel 0 which is connected
I Low Ron multiplexers
I Allows voltage level translation between 1.8 V, 2.5 V, 3.3 V and 5 V buses
I No glitch on power-up
I Supports hot insertion
I Low standby current
I Operating power supply voltage range of 2.3 V to 5.5 V
I 5 V tolerant inputs
I 0 Hz to 400 kHz clock frequency
I ESD protection exceeds 2000 V HBM per JESD22-A114, 200 V MM per
JESD22-A115, and 1000 V CDM per JESD22-C101
I Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100 mA
I Packages offered: SO24, TSSOP24, HVQFN24
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