1.

General description

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

that the master can regain control of the bus.

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

JESD22-A115, and 1000 V CDM per JESD22-C101

PCA9547

Rev. 02 — 12 September 2006

Product data sheet