PCF8574AP NXP Semiconductors, PCF8574AP Datasheet - Page 8

• Manufacturer Part Number: PCF8574AP
• Description: IC, I/O EXPANDER, 8BIT, 100KHZ, DIP-16
• Manufacturer: NXP Semiconductors

Specifications of PCF8574AP

• Chip Configuration: 8 Bit
• Bus Frequency: 100kHz
• Ic Interface Type: I2C
• No. Of I/o's: 8
• Supply Voltage Range: 2.5V To 6V
• Digital Ic Case Style: DIP
• No. Of Pins: 16
• Termination Type: SMD
• Filter Terminals: SMD
• Rohs Compliant: Yes
• Clock Frequency: 100kHz
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Philips Semiconductors
7
7.1
For addressing see Figs 9, 10 and 11.
Each of the PCF8574’s eight I/Os can be independently
used as an input or output. Input data is transferred from
the port to the microcontroller by the READ mode
(see Fig.11). Output data is transmitted to the port by the
WRITE mode (see Fig.10).
1997 Apr 02
handbook, full pagewidth
handbook, full pagewidth
Remote 8-bit I/O expander for I
(a) PCF8574.
(b) PCF8574A.
FUNCTIONAL DESCRIPTION
Addressing
S
write pulse
data from
shift register
power-on
reset
read pulse
data to
shift register
0
1
slave address
0
0
a.
Fig.9 PCF8574 and PCF8574A slave addresses.
Fig.8 Simplified schematic diagram of each I/O.
A2
A1
D
C I
FF
S
A0
Q
0
2
C-bus
A
D
C I
FF
S
8
Q
S
0
1
100
A
1
slave address
1
b.
A2
MBD977
A1
A0
P0 to P7
to interrupt
V DD
V SS
logic
0
Product specification
MBD973
A
PCF8574