PCA9556(1998) データシートの表示（PDF） - Philips Electronics

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PCA9556
(Rev.:1998)

Octal SMBus Registered Interface

Philips Electronics 

Philips Semiconductors

Octal SMBus Registered Interface

SIMPLIFIED SCHEMATIC OF I/O0

DATA FROM

SHIFT REGISTER

DATA FROM

SHIFT REGISTER

WRITE MASK PULSE

INPUT/OUTPUT

MASK REGISTER

DQ

FF

CK Q

WRITE PULSE

WRITE

REGISTER

DQ

FF

CK Q

READ PULSE

DATA FROM

SHIFT REGISTER

WRITE

POLARITY

PULSE

READ

REGISTER

DQ

FF

CK Q

POLARITY

REGISTER

DQ

FF

CK Q

NOTE: ON POWER-UP OR RESET, ALL REGISTERS RETURN TO DEFAULT VALUES

Figure 3. Simplified schematic of I/O0

Product specification

PCA9556

OUTPUT PORT

REGISTER DATA

I/O0

ESD PROTECTION DIODE

VSS

INPUT PORT

REGISTER DATA

POLARITY

REGISTER DATA

su01047

1998 Dec 18

4

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