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CAT9954AHV4I-T2 Datasheet(PDF) 1 Page - Catalyst Semiconductor

No. de pieza CAT9954AHV4I-T2
Descripción Electrónicos  8-bit I2C and SMBus I/O Port with Interrupt
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Fabricante Electrónico  CATALYST [Catalyst Semiconductor]
Página de inicio  http://www.catalyst-semiconductor.com
Logo CATALYST - Catalyst Semiconductor

CAT9954AHV4I-T2 Datasheet(HTML) 1 Page - Catalyst Semiconductor

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© 2005 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
1
CAT9554, CAT9554A
8-bit I2C and SMBus I/O Port with Interrupt
Doc. No. 25088, Rev. B
DESCRIPTION
The CAT9554 and CAT9554A are CMOS devices that
provide 8-bit parallel input/output port expansion 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 CAT9554/9554A consist of an input port register, an
output port register, a configuration register, a polarity
inversion register and an I2C/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 I2C
slave address is different. This allows up to 16 of devices
(eight CAT9554 and eight CAT9554A) to be connected
on the same bus.
* Catalyst Semiconductor is licensed by Philips Corporation to carry the I2C Bus Protocol.
BLOCK DIAGRAM
FEATURES
I 400kHz I2C bus compatible*
I 2.3V to 5.5V operation
I Low stand-by current
I 5V tolerant I/Os
I 8 I/O pins that default to inputs at power-up
I High drive capability
I Individual I/O configuration
I Polarity inversion register
I Active low interrupt output
I Internal power-on reset
I No glitch on power-up
I Noise filter on SDA/SCL inputs
I Cascadable up to 8 devices
I Industrial temperature range
I RoHS-compliant 16-lead SOIC and TSSOP, and
16-pad TQFN (4 x 4 mm) packages
APPLICATIONS
I White goods (dishwashers, washing machines)
I Handheld devices (cell phones, PDAs, digital
cameras)
I Data Communications (routers, hubs and
servers)
8-BIT
I/O0
I/O1
I/O2
I/O3
I/O4
I/O5
I/O6
I/O7
VCC
INT
WRITE pulse
READ pulse
LP
FILTER
POWER-ON
RESET
INPUT
FILTER
I2C/SMBUS
CONTROL
A0
A1
A2
SCL
SDA
VCC
VSS
NOTE: ALL I/Os ARE SET TO INPUTS AT RESET
INPUT/
OUTPUT
PORTS
For Ordering Information details, see page 15.


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