Datasheet

PCA8574_PCA8574A All information provided in this document is subject to legal disclaimers. © NXP B.V. 2013. All rights reserved.
Product data sheet Rev. 3 — 3 June 2013 4 of 32
NXP Semiconductors
PCA8574; PCA8574A
Remote 8-bit I/O expander for I
2
C-bus with interrupt
6. Pinning information
6.1 Pinning
Fig 2. Simplified schematic diagram of P0 to P7
002aah521
write pulse
read pulse
D
CI
S
FF
Q
power-on reset
data from Shift Register
I
trt(pu)
100 µA
I
OH
I
OL
V
DD
P0 to P7
V
SS
D
CI
S
FF
Q
data to Shift Register
to interrupt logic
Fig 3. Pin configuration for SO16 Fig 4. Pin configuration for
TSSOP16
Fig 5. Pin configuration for
SSOP20
PCA8574D
PCA8574AD
A0 V
DD
A1 SDA
A2 SCL
P0 INT
P1 P7
P2 P6
P3 P5
V
SS
P4
002aac678
1
2
3
4
5
6
7
8
10
9
12
11
14
13
16
15
PCA8574PW
PCA8574APW
A0 V
DD
A1 SDA
A2 SCL
P0 INT
P1 P7
P2 P6
P3 P5
V
SS
P4
002aac941
1
2
3
4
5
6
7
8
10
9
12
11
14
13
16
15
PCA8574TS
PCA8574ATS
INT P7
SCL P6
n.c. n.c.
SDA P5
V
DD
P4
A0 V
SS
A1 P3
n.c. n.c.
A2 P2
P0 P1
002aac680
1
2
3
4
5
6
7
8
9
10
12
11
14
13
16
15
18
17
20
19