Datasheet

D
FF
Q
D Q
FF
D Q
FF
D Q
FF
Data From
Shift Register
Data From
Shift Register
Write Configuration
Pulse
Write Pulse
Read Pulse
Data From
Shift Register
Write Polarity Pulse
C
K
Q
C
K
Q
C
K
Q
C
K
Q
Polarity
Inversion
Register
Input
Port
Register
Output
Port
Register
Configuration
Register
GND
Input Port
Register Data
Polarity
Register Data
ESD Protection Diode
P0
Output Port
Register Data
PCA9557
SCPS133I – DECEMBER 2005 – REVISED JUNE 2008 .................................................................................................................................................... www.ti.com
SIMPLIFIED SCHEMATIC DIAGRAM OF P0
A. On power up or reset, all registers return to default values.
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