PCF8574A expander equivalent, remote 8-bit i/o expander.
* I2C-bus to parallel port expander
* 100 kHz I2C-bus interface (Standard-mode I2C-bus)
* Operating supply voltage 2.5 V to 6 V with non-overvoltage tolerant .
and the latched output ports directly drive LEDs.
The PCF8574 and PCF8574A are identical, except for the different fixed.
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