1.

General description

SCL/SDA upstream pair fans out to four downstream pairs, or channels. Any individual

SCx/SDx channel or combination of channels can be selected, determined by the

contents of the programmable control register.

An active LOW reset input allows the PCA9546A to recover from a situation where one of

Power-On Reset (POR) function.

the maximum high voltage which will be passed by the PCA9546A. This allows the use of

different bus voltages on each pair, so that 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.

2.

Features

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

PCA9546A

Rev. 03 — 6 April 2005

Product data sheet