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PCA9557 series datasheets. Manufacturer: Philips Semiconductors.

PCA9557D8 bit I2C and SMBus I/O port with reset in 16-pin SO package. Operational temperature range from -40°C to 85°C.Datasheet*)
PCA9557PW8 bit I2C and SMBus I/O port with reset in 16-pin TSSOP package. Operational temperature range from -40°C to 85°C.Datasheet*)
PCA95578-bit I2C and SMBus I/0 port with resetDatasheet*)
There are other manufacturers for this components. For more information please check
PCA9557 (Texas Instruments)
Click here to download PCA9557 Datasheet
Click here to download Datasheet
*)

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