TI PCF8574ADWG4

This 8-bit input/output (I/O) expander for the two-wire bidirectional bus (I²C) is designed to operate between 2.5V and 6V VCC. The PCF8574A device provides general-purpose remote I/O expansion for most microcontroller families through the I²C interface [serial clock (SCL), serial data (SDA)]. The device features an 8-bit quasi-bidirectional I/O port (P0–P7), which includes latched outputs with high-current drive capability for directly driving LEDs. Each quasi-bidirectional I/O can be used as an input or an output (without the need for a data direction control signal). Upon power-up, these I/Os are at a high level. In this mode, only a current source connected to VCC is active.

• 10 μA low standby current consumption (maximum)
• I2C to parallel port expander
• Open-drain interrupt output
• Compatible with most microcontrollers
• Latched outputs with high-current drive capability for direct LED driving
• Latch-up performance exceeds 100mA per JESD 78 Class II

• Telecom shelters: filter units
• Servers
• Routers (telecom switching equipment)
• Personal computers
• Personal electronics
• Industrial automation
• Products with GPIO-constrained processors