CAT9554A ONSEMI [ON Semiconductor], CAT9554A Datasheet - Page 7

• Manufacturer Part Number: CAT9554A
• Manufacturer: ONSEMI [ON Semiconductor]

¯¯¯ : 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
Configuration Pulse
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Characteristics subject to change without notice
INT
Shift Register
Shift Register
Shift Register
Read Pulse
Write Pulse
Data from
Data from
Data from
Register
Polarity
Write
Write
Configuration
C K
D
Register
FF
Q
Q
Figure 4. Simplified Schematic of I/O
C K
D
Output Port
Register
FF
Q
Q
7
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.
Inversion Register
C K
C K
D
D
Input Port
Register
LATCH
Polarity
FF
Q
Q
Q
Q
0
to I/O
Q1
7
Q2
100kΩ
CAT9554, CAT9554A
Doc. No. MD-9002, Rev. F
Output Port
Register Data
I/O
Input Port
Register Data
V CC
V SS
To INT
Polarity
Register Data
0
to I/O
7