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PCF8574 Datasheet(PDF) 3 Page - Texas Instruments

Part # PCF8574
Description  PCF8574 Remote 8-Bit I/O Expander for I2C Bus
PDF  42 Pages
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Manufacturer  TI2 [Texas Instruments]
Direct Link  https://www.ti.com
Logo TI2 - Texas Instruments

PCF8574 Datasheet(HTML) 3 Page - Texas Instruments

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4 Pin Configuration and Functions
GND
P4
P5
P6
A2
A1
A0
VCC
1
2
3
4
9
10
11
12
Figure 4-1. RGT Package, 16 Pins (Top View)
1
20
19
18
17
16
15
14
13
12
11
10
2
3
4
5
6
7
8
9
SCL
NC
SDA
V
CC
A0
A1
NC
A2
P2
NC
P3
GND
P4
P5
NC
P6
Figure 4-2. RGY Package, 20 Pins (Top View)
SCL
NC
SDA
V
CC
A0
A1
NC
P7
P6
NC
P5
P4
GND
P3
NC
1
2
3
4
5
6
7
8
20
19
18
17
16
15
14
13
9
10
12
11
INT
A2
P0
P1
P2
Figure 4-3. DGV or PW Package, 20 Pins (Top View)
A0
A1
A2
P0
P1
P2
P3
GND
VCC
SDA
SCL
INT
P7
P6
P5
P4
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
Figure 4-4. DW or N Package, 20 Pins, Top View
Table 4-1. Pin Functions
PIN
TYPE
DESCRIPTION
NAME
RGT
RGY
DGV or PW
DW or N
A [0..2]
2, 3, 4
6, 7, 9
6, 7, 9
1, 2, 3
I
Address inputs 0 through 2. Connect directly to VCC or ground.
Pullup resistors are not needed.
GND
9
15
15
8
—
Ground
INT
14
1
1
13
O
Interrupt output. Connect to VCC through a pullup resistor.
NC
-
3, 8, 13, 18
3, 8, 13, 18
-
—
Do not connect
P[0..7]
5, 6, 7, 8,
10, 11, 12,
13
10, 11, 12, 14,
16, 17, 19, 20
10, 11, 12, 14,
16, 17, 19, 20
4, 5, 6, 7,
9, 10, 11,
12
I/O
P-port input/output. Push-pull design structure.
SCL
15
2
2
14
I
Serial clock line. Connect to VCC through a pullup resistor
SDA
16
4
4
15
I/O
Serial data line. Connect to VCC through a pullup resistor.
VCC
1
5
5
16
—
Voltage supply
www.ti.com
PCF8574
SCPS068K – JULY 2001 – REVISED SEPTEMBER 2024
Copyright © 2024 Texas Instruments Incorporated
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Product Folder Links: PCF8574



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