CAT9534
8-bit I²C and SMBus I/O Port with Interrupt
FEATURES
DESCRIPTION
400kHz I²C bus compatible
2.3V to 5.5V operation
The CAT9534 is an 8-bit parallel input/output port
expander for I²C and SMBus compatible applications.
These I/O expanders provide a simple solution in
applications where additional I/Os are needed: sensors,
power switches, LEDs, pushbuttons, and fans.
Low stand-by current
5V tolerant I/Os
8 I/O pins that default to inputs at power-up
High drive capability
The CAT9534 consists of an input port register, an
output port register, a configuration register, a polarity
inversion register and an I²C/SMBus-compatible serial
interface.
Individual I/O configuration
Polarity inversion register
Active low interrupt output
Internal power-on reset
No glitch on power-up
Any of the eight I/Os can be configured as an input or
output by writing to the configuration register. The
system master can invert the CAT9534 input data by
writing to the active-high polarity inversion register.
Noise filter on SDA/SCL inputs
Cascadable up to 8 devices
Industrial temperature range
The CAT9534 features an active low interrupt output
which indicates to the system master that an input
state has changed.
RoHS-compliant 16-lead SOIC and TSSOP, and
The device’s extended addressing capability allows up
to 8 devices to share the same bus.
16-pad TQFN (4 x 4mm) packages
CAT9534 is offered in 16 pin SOIC, TSSOP and
TQFN packages and operates over the full -40ºC to
+85ºC industrial temperature range.
APPLICATIONS
White goods (dishwashers, washing machines)
Handheld devices (cell phones, PDAs, digital
cameras)
For Ordering Information details, see page 15.
Data Communications (routers, hubs and
servers)
BLOCK DIAGRAM (1)
A0
A1
I/O
I/O
0
1
A2
I/O
I/O
I/O
2
3
4
8-BIT
SCL
INPUT/
OUTPUT
PORTS
INPUT
FILTER
2
I C/SMBUS
SDA
CONTROL
WRITE pulse
READ pulse
I/O
I/O
I/O
5
6
7
V
CC
POWER-ON
RESET
V
CC
V
SS
INT
LP FILTER
Notes:
(1) All I/Os are set to inputs at RESET.
© 2009 SCILLC. All rights reserved
Characteristics subject to change without notice
1
Doc. No. MD-9004 Rev. C