Product Summary

The PCF8574T is a silicon CMOS circuit. It provides general purpose remote I/O expansion for most microcontroller families via the two-line bidirectional bus (I2C-bus). The PCF8574T consists of an 8-bit quasi-bidirectional port and an I2C-bus interface. It has a low current consumption and includes latched outputs with high current drive capability for directly driving LEDs. It also possesses an interrupt line (INT) which can be connected to the interrupt logic of the microcontroller. By sending an interrupt signal on this line, the remote I/O can inform the microcontroller if there is incoming data on its ports without having to communicate via the I2C-bus. This means that the PCF8574T can remain a simple slave device.

Parametrics

PCF8574T absolute maximum ratings: (1)VDD, supply voltage: -0.5 to +7.0 V; (2)VI, input voltage: VSS - 0.5 to VDD + 0.5 V; (3)II, DC input current: ±20 mA max; (4)IO, DC output current: ±25 mA max; (5)IDD, supply current: ±100 mA max; (6)ISS, supply current: ±100 mA max; (7)Ptot, total power dissipation: 400 mW max; (8)PO, power dissipation per output: 100 mW max; (9)Tstg, storage temperature: -65 to +150℃; (10)Tamb, ambient temperature: -40 to +85℃.

Features

PCF8574T features: (1)Operating supply voltage 2.5 to 6 V; (2)Low standby current consumption of 10 mA maximum; (3)I2C-bus to parallel port expander; (4)Open-drain interrupt output; (5)8-bit remote I/O port for the I2C-bus; (6)Compatible with most microcontrollers; (7)Latched outputs with high current drive capability for directly driving LEDs; (8)Address by 3 hardware address pins for use of up to 8 devices (up to 16 with PCF8574A); (9)DIP16, or space-saving SO16 or SSOP20 packages.

Diagrams

Image Part No Mfg Description Data Sheet Download Pricing
(USD)
Quantity
PCF8574T/3,512
PCF8574T/3,512

NXP Semiconductors

I2C Interface IC REMOTE I/O EXPANDER

Data Sheet

0-1280: $0.43
1280-2000: $0.40
2000-5000: $0.38
5000-10000: $0.37
PCF8574T/3,518
PCF8574T/3,518

NXP Semiconductors

I/O Expanders, Repeaters & Hubs I/O EXPANDER I2C

Data Sheet

0-1: $0.89
1-25: $0.80
25-100: $0.71
100-250: $0.62
PCF8574TD
PCF8574TD

NXP Semiconductors

I2C Interface IC REMOTE I/O EXPANDER

Data Sheet

Negotiable 
PCF8574TS/3,118
PCF8574TS/3,118

NXP Semiconductors

I/O Expanders, Repeaters & Hubs I/O EXPANDER I2C

Data Sheet

0-1: $0.89
1-25: $0.80
25-100: $0.71
100-250: $0.62
PCF8574TS/3,112
PCF8574TS/3,112

NXP Semiconductors

I2C Interface IC REMOTE I/O EXPANDER

Data Sheet

0-1: $0.52
1-25: $0.48
25-100: $0.45
100-250: $0.43