PCA9556(1998) Ver la hoja de datos (PDF) - Philips Electronics
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PCA9556 Datasheet PDF : 12 Pages
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Philips Semiconductors
Octal SMBus Registered Interface
Product specification
PCA9556
SIMPLIFIED SCHEMATIC OF I/O1 TO I/O7
DATA FROM
SHIFT REGISTER
DATA FROM
SHIFT REGISTER
WRITE MASK PULSE
WRITE PULSE
INPUT/OUTPUT
MASK REGISTER
DQ
FF
CK Q
WRITE
REGISTER
DQ
FF
CK Q
READ PULSE
READ
REGISTER
DQ
FF
CK Q
POLARITY
REGISTER
DATA FROM
SHIFT REGISTER
WRITE
POLARITY
PULSE
NOTE: ON POWER-UP OR RESET, ALL REGISTERS RETURN TO DEFAULT VALUES
DQ
FF
CK Q
Figure 4. Simplified schematic of I/O1 to I/O7
OUTPUT PORT
REGISTER DATA
VDD
ESD PROTECTION DIODE
I/O1 TO I/O7
ESD PROTECTION DIODE
VSS
INPUT PORT
REGISTER DATA
POLARITY
REGISTER DATA
su01055
1998 Dec 18
5
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