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NXP  PCF8574T  is an 8-bit remote I / O extender for the I²C bus with interruption. NXP PCF8574T  Universal remote I / O extension via two-way I²C bus (serial clock (SCL), serial data (SDA)). The device consists of eight quasi-bidirectional ports, a 100kHzI²C bus interface, three hardware address inputs, and an interrupt output running between 2.5 and 6V. The quasi-bidirectional port can be independently assigned as inputs to monitor the interrupt status, and the system master server can be read from the input port, or written to the output port via a single register. Low current consumption (2.5 A is typical, static) is very good for mobile applications, and the latched output port drives the led directly.

NXP   PCF8574T chip specifications:

-Power Supply Voltage (DC);2.50V (min).

-Operating Voltage; 2.5V ~ 6V,

-Output current; 25 mA,

-Power supply current; 40.0 A,

-Clock frequency; 100 kHz,

-Number of needles and feet; 16,

-Disseminated power; 400 mW,

-Input / output number; 8 Input,

-Power supply voltage; 2.5V ~ 6V,

-Installation mode; Surface Mount,

-Number of pins; 16

-Packaging; SOIC-16

-Operating temperature range; -40℃ ~ 85℃,