PCF8574T Datasheet
Table Of Contents
- 1 FEATURES
- 2 GENERAL DESCRIPTION
- 3 ORDERING INFORMATION
- 4 BLOCK DIAGRAM
- 5 PINNING
- 6 CHARACTERISTICS OF THE I 2 C-BUS
- 7 FUNCTIONAL DESCRIPTION
- 8 LIMITING VALUES
- 9 HANDLING
- 10 DC CHARACTERISTICS
- 11 I 2 C-BUS TIMING CHARACTERISTICS
- 12 PACKAGE OUTLINES
- 13 SOLDERING
- 14 DATA SHEET STATUS
- 15 DEFINITIONS
- 16 DISCLAIMERS
- 17 PURCHASE OF PHILIPS I 2 C COMPONENTS
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2002 Nov 22 13
Philips Semiconductors Product speciļ¬cation
Remote 8-bit I/O expander for I
2
C-bus
PCF8574
handbook, full pagewidth
MBD971
S 0 1 1 1 A2 A1 A0 0 A
start condition
1
P3
R/W acknowledge
from slave
A 0
P3
A P
SDA
SCL
P3
OUTPUT
VOLTAGE
I
OHt
I
OH
P3
PULL-UP
OUTPUT
CURRENT
slave address (PCF8574A)
data to port data to port
12345678
Fig.15 Transient pull-up current I
OHt
while P3 changes from LOW-to-HIGH and back to LOW.