PCF8574T/3,518 NXP Semiconductors, PCF8574T/3,518 Datasheet - Page 11

• Manufacturer Part Number: PCF8574T/3,518
• Description: IC I/O EXPANDER I2C 8B 16SOIC
• Manufacturer: NXP Semiconductors

Specifications of PCF8574T/3,518

• Package / Case: 16-SOIC (0.300", 7.5mm Width)
• Interface: I²C
• Number Of I /o: 8
• Interrupt Output: Yes
• Frequency - Clock: 100KHz
• Voltage - Supply: 2.5 V ~ 6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Includes: POR
• Logic Family: PCF8574
• Number Of Lines (input / Output): 8.0 / 8.0
• Operating Supply Voltage: 2.5 V to 6 V
• Power Dissipation: 400 mW
• Operating Temperature Range: - 40 C to + 85 C
• Logic Type: I/O Expander
• Maximum Clock Frequency: 100 KHz
• Mounting Style: SMD/SMT
• Number Of Input Lines: 8.0
• Number Of Output Lines: 8.0
• Output Current: 25 mA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: 568-3615 - DEMO BOARD I2C
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 568-1077-2; 935275617518; PCF8574TD-T

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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