Product description
The PCA9555 is a 24-pin CMOS device that provides 16 bits of General Purpose parallel Input/Output (GPIO) expansion for I2C-bus/SMBus applications and was developed to enhance the NXP Semiconductors family of I2C-bus I/O expanders. The improvements include higher drive capability, 5 V I/O tolerance, lower supply current, individual I/O configuration, and smaller packaging. I/O expanders provide a simple solution when additional I/O is needed for ACPI power switches, sensors, push buttons, LEDs, fans, etc.
* Operating power supply voltage range of 2.3 V to 5.5 V
* 5 V tolerant I/Os
* Polarity Inversion register
* Active LOW interrupt output
* Low standby current
* Noise filter on SCL/SDA inputs
* No glitch on power-up
* Internal power-on reset
* 16 I/O pins which default to 16 inputs
* 0 Hz to 400 kHz clock frequency
* Operating power supply voltage range of 2.3 V to 5.5 V
* 5 V tolerant I/Os
* Polarity Inversion register
* Active LOW interrupt output
* Low standby current
* Noise filter on SCL/SDA inputs
* No glitch on power-up
* Internal power-on reset
* 16 I/O pins which default to 16 inputs
* 0 Hz to 400 kHz clock frequency