PCA9542A Datasheet, PDF (1/22 Pages) NXP Semiconductors – 2-channel I2C-bus multiplexer and interrupt logic

PCA9542A
2-channel I²C-bus multiplexer and interrupt logic
Rev. 04 — 15 June 2009
Product data sheet
1. General description
The PCA9542A is a 1-of-2 bidirectional translating multiplexer, controlled via the I²C-bus.
The SCL/SDA upstream pair fans out to two 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. Two interrupt inputs, INT0 and INT1, one for each of the
SCx/SDx downstream pairs, are provided. One interrupt output, INT, which acts as an
AND of the two 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 V_DD pin can be used to
limit the maximum high voltage which will be passed by the PCA9542A. This allows the
use of different bus voltages on each SCx/SDx 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-2 bidirectional translating multiplexer
I I²C-bus interface logic; compatible with SMBus
I 2 active LOW interrupt inputs (INT0, INT1)
I Active LOW interrupt output (INT)
I 3 address pins allowing up to 8 devices on the I²C-bus
I Channel selection via I²C-bus
I Powers up with all multiplexer channels deselected
I Low R_on switches
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: SO14, TSSOP14