© Semiconductor Components Industries, LLC, 2011
June, 2011 − Rev. 0
1 Publication Order Number:
CAT9534/D
CAT9534
8-bit I
2
C and SMBus I/O Port
with Interrupt
Description
The CAT9534 is an 8−bit parallel input/output port expander for I
2
C
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 an
I
2
C/SMBus−compatible 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 active−high polarity inversion
register.
The CAT9534 features an active low interrupt output which
indicates to the system master that an input state has changed.
The device’s 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 −40°C to +85°C industrial temperature
range.
Features
• 400 kHz I
2
C Bus Compatible
• 2.3 V to 5.5 V Operation
• Low Stand−by Current
• 5 V Tolerant I/Os
• 8 I/O Pins that Default to Inputs at Power−up
• High Drive Capability
• Individual I/O Configuration
• Polarity Inversion Register
• Active Low Interrupt Output
• Internal Power−on Reset
• No Glitch on Power−up
• Noise Filter on SDA/SCL Inputs
• Cascadable up to 8 Devices
• Industrial Temperature Range
• 16−lead SOIC and TSSOP, and 16−pad TQFN (4 x 4 mm) Packages
• These Devices are Pb−Free, 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)
TQFN−16
HV4 SUFFIX
CASE 510AE
http://onsemi.com
SOIC−16
W SUFFIX
CASE 751BG
PIN CONNECTIONS
SOIC (W), TSSOP (Y)
(Top View)
1
A0
A1
A2
I/O
1
I/O
0
V
CC
SDA
SCL
INT
I/O
7
I/O
6
I/O
5
I/O
4
I/O
2
I/O
3
V
SS
TSSOP−16
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/O
7
I/O
6
A2
I/O
1
I/O
0
I/O
2
A1
A0
V
CC
SDA
I/O
3
I/O
4
V
SS
I/O
5
1