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© Semiconductor Components Industries, LLC, 2011
June, 2011 − Rev. 6
1 Publication Order Number:
CAT9554/D
CAT9554, CAT9554A
8-bit I
2
C and SMBus I/O Port
with Interrupt
Description
The CAT9554 and CAT9554A are CMOS devices that provide 8−bit
parallel input/output port expansion 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 CAT9554/9554A consist 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
CAT9554/9554A input data by writing to the active−high polarity
inversion register.
The CAT9554/9554A 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. The CAT9554A is identical to the CAT9554
except the fixed part of the I
2
C slave address is different. This allows
up to 16 of devices (eight CAT9554 and eight CAT9554A) to be
connected on the same bus.
Features
• 400 kHz I
2
C Bus Compatible (Note 1)
• 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)
1. All I/Os are set to inputs at RESET.
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
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