CAT9554 Datasheet, PDF (14/28 Pages) Catalyst Semiconductor – Catalyst Semiconductor

i²c and smbus i/o port expanders
CAT9554 / CAT9554A — 8-bit I²C and SMBus I/O Port Expander with Interrupt
CAT9555 — 16-bit I²C and SMBus I/O Port Expander with Interrupt
Features
Package Information
■ 2.3V to 5.5V operation ■ drive LEDs by sinking 25mA current ■ individual I/O configuration ■ 16-pin SOIC (CAT9554),24-pin SOIC (CAT9555)
■ -40°C to +85°C operation ■ active low interrupt output
■ internal power-on reset
■ 16-pin TSSOP (CAT9554), 24-pin TSSOP (CAT9555)
■ 400kHz I²C bus compatible ■ cascadable up to 8 devices-16
■ 5V tolerant I/Os
devices (CAT9555)
■ high drive capability
■ noise filter on SDA/SCL inputs ■ 16-pad TQFN (4 x 4 mm) (CAT9554),24-pin TQFN
(4x4mm) (CAT9555)
■ pin compatible with PCA9554/9554A and PCA9555
A0
A1
A2
SCL
SDA
INPUT
FILTER
I2C/SMBUS
CONTROL
VCC
VSS
POWER-ON
RESET
NOTE: ALL I/Os ARE SET TO INPUTS AT RESET
VDD
VDD
SCL
SDA
INT
GND
VDD
SCL
SDA
INT
I/O 0.0
I/O 0.1
I/O 0.2
I/O 0.3
I/O 0.4
I/O 0.5
CAT9535
I/O 0.6
I/O 0.7
A2
I/O 1.0
I/O 1.1
A1
I/O 1.2
I/O 1.3
A0
I/O 1.4
I/O 1.5
I/O 1.6
VSS ^I/O 1.7
8-BIT
WRITE pulse
READ pulse
INPUT/
OUTPUT
PORTS
I/O0
I/O1
I/O2
I/O3
I/O4
I/O5
I/O6
I/O7
VCC
LP
FILTER
SUBSYSTEM 1
2k
INT
SUBSYSTEM 2
RESET
A
Applications
■ RAID systems
■ servers
■ test equipment
■ fan control
Timer
ALARM
SUBSYSTEM 3
ENABLE
B
VDD
Controlled Switch
NUMERIC
KEYPAD
CAT9534 / CAT9535
8-bit / 16-bit I²C and SMBus Low Power I/O Port expander with Interrupt
Features
Package Information
■ low stand-by current
■ active low interrupt output
■ 16-pin SOIC & 16-pin TSSOP (CAT9534), 24-pin SOIC (CAT9535)
■ 0 to 400 kHz clock frequency _{■ internal power-on reset}
■ 16-pad TQFN (4 x 4 mm) (CAT9534), 24-pin TQFN (4x4mm) (CAT9535)
■ 2.3 V to 5.5 V operation
■ noise filter on SCL/SDA inputs
■ pin compatible with PCA9534
■ 5 V tolerant I/Os
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