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Part Name
Description
PCA9556 View Datasheet(PDF) - Philips Electronics
Part Name
Description
Manufacturer
PCA9556
Octal SMBus and I2C registered interface
Philips Electronics
PCA9556 Datasheet PDF : 13 Pages
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Philips Semiconductors
Octal SMBus and I
2
C registered interface
Product data
PCA9556
BLOCK DIAGRAM
A0
A1
A2
SCL
SDA
V
DD
V
SS
RESET
SYSTEM DIAGRAM
V
CC
= 16
GND = 8
15
RESET
1.1 K
Ω
1
SCL
1.6 K
Ω
2
SDA
1.6 K
Ω
5
A2
or
1.1 K
Ω
4
A1
3
A0
1.1 K
Ω
or
1.1 K
Ω
or
INPUT
FILTER
POWER-ON
RESET
I/O0
I/O1
I/O2
SMBus
8-BIT
INPUT/
OUTPUT
I/O3
CONTROL
PORTS
I/O4
WRITE pulse
I/O5
READ pulse
I/O6
I/O7
NOTE: ALL I/Os ARE SET TO INPUTS AT RESET
Figure 2. Block diagram
SW00793
Input Port
Q7
Polarity Inversion
Q7
Configuration
Q7
Output Port
Q7
Q6
Q6
Q6
Q6
Q5
Q5
Q5
Q5
I
2
C/SMBus
Interface
Q4
Q4
Q4
Q4
logic
Q3
Q3
Q3
Q3
Q2
Q2
Q2
Q2
Q1
Q1
Q1
Q1
Q0
Q0
Q0
Q0
1.1 K
Ω
I/O0
6
I/O1
7
I/O2
9
I/O3
10
I/O4
11
I/O5
12
I/O6
13
I/O7
14
Figure 3. System diagram
SW00794
2002 Mar 28
3
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