PCA9539 series datasheets. Manufacturer: Philips Semiconductors.

PCA9539 16-bit I2C and SMBus, low power I/O port with interrupt and reset Datasheet*) PCA9539BS 16-bit I2C and SMBus, low power I/O port with interrupt and reset Datasheet*) PCA9539D 16-bit I2C and SMBus, low power I/O port with interrupt and reset Datasheet*) PCA9539PW 16-bit I2C and SMBus, low power I/O port with interrupt and reset Datasheet*) There are other manufacturers for this components. For more information please check PCA9539 (Texas Instruments)

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