PCF8574TD NXP Semiconductors, PCF8574TD Datasheet - Page 11

• Manufacturer Part Number: PCF8574TD
• Description: I/O Expander 16-Pin SO Tube
• Manufacturer: NXP Semiconductors

Specifications of PCF8574TD

• Package: 16SO
• Operating Temperature: -40 to 85 °C
• 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: SOIC
• No. Of Pins: 16
• Termination Type: SMD
• Filter Terminals: SMD
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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A LOW-to-HIGH transition of SDA, while SCL is HIGH is defined as the stop condition (P). Transfer of data can be stopped at any moment by a stop condition. When this occurs, data present
at the last acknowledge phase is valid (output mode). Input data is lost.
READ FROM
DATA INTO
PORT
PORT
INT
SDA
start condition
t iv
S
0
slave address (PCF8574)
1
0
0
A2
A1
A0
t ph
R/W
1
Fig.12 READ mode (input).
A
acknowledge
from slave
DATA 2
t ir
data from port
DATA 1
DATA 3
t ps
A
acknowledge
from slave
t ir
data from port
DATA 4
DATA 4
1
condition
MBD975
stop
P