CAT9554 datasheet(7/16 Pages) CATALYST

Part #	CAT9554

Description	8-bit I2C and SMBus I/O Port with Interrupt

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Manufacturer	CATALYST [Catalyst Semiconductor]

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CAT9554, CAT9554A

7

Doc. No. 25088, Rev. B

Characteristics subject to change without notice

INT: Interrupt Output

The open-drain interrupt output is activated when one of

the port pins configured as an input changes state

(differs from the corresponding input port register bit

state). The interrupt is deactivated when the input returns

to its previous state or the input port register is read.

Changing an I/O from an output to an input may cause

a false interrupt if the state of the pin does not match the

contents of the input port register.

Figure 4. Simplified Schematic of I/O0 to I/O7

Output Port

Register Data

VCC

I/O0 to I/O7

VSS

Input Port

Register Data

To

INT

Polarity

Register Data

Polarity

Inversion Register

Write

Polarity

Register

Data from

Shift Register

Read Pulse

Write Pulse

Write

Configuration Pulse

Data from

Shift Register

Data from

Shift Register

Configuration

Register

D

Q

CK

Q

FF

D

Q

CK

Q

FF

DQ

CK

Q

LATCH

DQ

CK

Q

FF

Q1

Q2

Output Port

Register

Input Port

Register

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