CAT9557 Datasheet, PDF (1/17 Pages) ON Semiconductor – 8-Bit I2C-Bus and SMBus I/O Port

CAT9557
8-Bit I²C-Bus and SMBus I/O
Port with Reset
Description
The CAT9557 is a device which provides parallel input/output port
expansion for SMBus and I²C−bus applications. The CAT9557
consists of an 8−bit input port register, 8−bit output port register, and
an I²C−bus/SMBus interface. It has low current consumption and a
high−impedance open−drain output pin, IO0.
The system master can enable the CAT9557’s I/O as either input or
output by writing to the configuration register. The system master can
also invert the CAT9557 inputs by writing to the active HIGH polarity
inversion register. Finally, the system master can reset the CAT9557 in
the event of a time−out by asserting a LOW in the reset input.
The power−on reset puts the registers in their default state and
initializes the I²C−bus/SMBus state machine. The RESET pin causes
the same reset/initialization to occur without turning off the power to
the part.
Features
• Operating Power Supply Voltage Range of 2.3 V to 5.5 V
• 5 V Tolerant Inputs/Outputs
• 400 kHz I²C Bus Compatible
• Low Stand−by Current
• 8 General Purpose Input/Output Expander/Collector
• Input/Output Configuration Register
• Active High Polarity Inversion Register
• Internal Power−on Reset
• Noise Filter on SCL/SDA Inputs
• Active Low RESET Input
• 3 Address Pins Allowing up to 8 Devices on the I²C−bus/SMBus
• High−impedance Open−drain on IO0
• Power−up with All Channels Configured as Inputs
• 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)
http://onsemi.com
1
TQFN−16
HV4 SUFFIX
CASE 510AE
1
TSSOP−16
Y SUFFIX
CASE 948AN
SOIC−16
W SUFFIX
CASE 751BG
MARKING DIAGRAMS
See detailed marking information on page 2 of this
data sheet.
PIN CONNECTIONS
See detailed pin connections information on
page 2 of this data sheet.
ORDERING INFORMATION
Device
CAT9557WI−GT2
Package
SOIC−16
(Pb−Free)
Shipping^†
2,000 /
Tape & Reel
CAT9557YI−GT2
TSSOP−16
2,000 /
(Pb−Free) Tape & Reel
CAT9557HV4I−GT2 TQFN−16
2,000 /
(Pb−Free) Tape & Reel
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specification
Brochure, BRD8011/D.
© Semiconductor Components Industries, LLC, 2011
1
March, 2011 − Rev. 0
Publication Order Number:
CAT9557/D