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PCA9542A Datasheet

2-channel I2C-bus multiplexer and interrupt logic

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PCA9542A
www.DataSheet4U.com
2-channel I2C-bus multiplexer and interrupt logic
Rev. 03 — 24 November 2008
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 VDD 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 Ron 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


NXP Semiconductors Electronic Components Datasheet

PCA9542A Datasheet

2-channel I2C-bus multiplexer and interrupt logic

No Preview Available !

NXP Semiconductors
PCA9542Awww.DataSheet4U.com
2-channel I2C-bus multiplexer and interrupt logic
3. Ordering information
Table 1. Ordering information
Type number Package
Name
Description
PCA9542AD
SO14
plastic small outline package; 14 leads;
body width 3.9 mm
PCA9542APW TSSOP14 plastic thin shrink small outline package; 14 leads;
body width 4.4 mm
Version
SOT108-1
SOT402-1
3.1 Ordering options
Table 2. Ordering options
Type number Topside mark
PCA9542AD
PCA9542AD
PCA9542APW PA9542A
Temperature range
40 °C to +85 °C
40 °C to +85 °C
4. Block diagram
PCA9542A
SC0
SC1
SD0
SD1
VSS
VDD
POWER-ON
RESET
SWITCH CONTROL LOGIC
SCL
SDA
INPUT
FILTER
I2C-BUS
CONTROL
INT[1:0]
INTERRUPT LOGIC
Fig 1. Block diagram of PCA9542A
A0
A1
A2
INT
002aae303
PCA9542A_3
Product data sheet
Rev. 03 — 24 November 2008
© NXP B.V. 2008. All rights reserved.
2 of 22


Part Number PCA9542A
Description 2-channel I2C-bus multiplexer and interrupt logic
Maker NXP Semiconductors
Total Page 22 Pages
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