PCA9556 Description
The PCA9556 is a silicon CMOS circuit which provides parallel input/output expansion for SMBus applications. The PCA9556 consists of an 8-bit input port register, 8-bit output port register, and an SMBus interface. It has low current consumption and a high impedance open drain output pin, I/O0.
PCA9556 Key Features
- SMBus pliance with fixed 3.3V voltage levels
- Operating power supply voltage range of 3.0V
- Active high polarity inverter register
- Write protect register
- Active low reset pin
- Low leakage current on power-down
- Noise filter on SCL/SDA inputs
- No glitch on power-up
- Internal power-on reset
- 8 I/O pins which default to 8 inputs