PCA9556 Philips Semiconductors, PCA9556 Datasheet - Page 4

• Manufacturer Part Number: PCA9556
• Description: Octal SMBus Registered Interface
• Manufacturer: Philips Semiconductors

Philips Semiconductors
SIMPLIFIED SCHEMATIC OF I/O0
1998 Dec 18
Octal SMBus Registered Interface
NOTE: ON POWER-UP OR RESET, ALL REGISTERS RETURN TO DEFAULT VALUES
WRITE MASK PULSE
SHIFT REGISTER
SHIFT REGISTER
SHIFT REGISTER
DATA FROM
DATA FROM
DATA FROM
READ PULSE
WRITE PULSE
POLARITY
WRITE
PULSE
INPUT/OUTPUT
MASK REGISTER
C
D
K
FF
Q
Q
Figure 3. Simplified schematic of I/O0
WRITE
REGISTER
C
D
K
FF
Q
Q
4
READ
REGISTER
POLARITY
REGISTER
C
C
D
D
K
K
FF
FF
Q
Q
Q
Q
ESD PROTECTION DIODE
I/O0
V
REGISTER DATA
REGISTER DATA
REGISTER DATA
SS
OUTPUT PORT
INPUT PORT
POLARITY
Product specification
PCA9556
su01047