PCF8575 Datasheet PDF - NXP Semiconductors.

GENERAL DESCRIPTION
The PCF8575 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 device consists of a 16-bit quasi-bidirectional port and an I2C-bus interface. The PCF8575 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 PCF8575 is an I2C-bus slave transmitter/receiver.

FEATURES
• Operating supply voltage 2.5 to 5.5 V
• Low standby current consumption of 10 µA maximum
• I2C-bus to parallel port expander
• 400 kbits/s FAST I2C-bus
• Open-drain interrupt output
• 16-bit remote I/O port for the I2C-bus
• Compatible with most microcontrollers
• Latched outputs with high current drive capability for directly driving LEDs
• Address by 3 hardware address pins for use of up to 8 devices
• SSOP24 package.