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CAT9534
I/O Port Expander, I2C / SMBus, 8-Bit, with Active Low Interrupt
CAT9534
8-bit I2 C and SMBus I/O Port
with Interrupt
Description
The CAT9534 is an 8ïbit 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.
The CAT9534 consists of an input port register, an output port
register, a configuration register, a polarity inversion register and an2 C/SMBusïcompatible serial interface.
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 activeïhigh polarity inversion
register.
The CAT9534 features an active low interrupt output which
indicates to the system master that an input state has changed.
The devices extended addressing capability allows up to 8 devices
to share the same bus.
CAT9534 is offered in 16 pin SOIC, TSSOP and TQFN packages
and operates over the full ï40°C to +85°C industrial temperature
range.
Features 400 kHz I2 C Bus Compatible 2.3 V to 5.5 V Operation Low Standïby Current 5 V Tolerant I/Os 8 I/O Pins that Default to Inputs at Powerïup High Drive Capability Individual I/O Configuration Polarity Inversion Register Active Low Interrupt Output Internal Powerïon Reset No Glitch on Powerïup Noise Filter on SDA/SCL Inputs Cascadable up to 8 Devices Industrial Temperature Range 16ïlead SOIC and TSSOP, and 16ïpad TQFN (4 x 4 mm) Packages These Devices are PbïFree, Halogen Free/BFR Free and are RoHS
Compliant
Applications White Goods (dishwashers, washing machines) Handheld Devices (cell phones, PDAs, digital cameras) Data Communications (routers, hubs and servers)
TQFNï16
HV4 SUFFIX
CASE 510AE
http://
SOICï16
W SUFFIX
CASE 751BG
PIN CONNECTIONS
SOIC (W), TSSOP (Y)
(Top View)
I/O1
I/O0
VCC
SDA
SCL
INT
I/O7
I/O6
I/O5
I/O4
I/O2
I/O3
VSS
TSSOPï16
Y SUFFIX
CASE 948AN
See detailed ordering and shipping information in the package
dimensions section on page 14 of this data sheet.
ORDERING INFORMATION
TQFN 4 x 4 mm (HV4)
(Top View)
SCL
INT
I/O7
I/O6
I/O1
I/O0
I/O2
