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1 PCA9554PW 8-bit I2C and SMBus I/O port with interrupt 188K PHILIPS 5054721
2 PCA9554PW 8-bit I2C and SMBus I/O port with interrupt 188K PHILIPS 4373838
3 PCA9554PW 8-bit I2C-bus and SMBus I/O port with interrupt 192K NXP 1506937