The PCA9517A,118 is an interface-signal buffer/repeater for the Inter-Integrated Circuit (I2C) bus, manufactured by NXP. This 8-kick IC is designed to improve signal integrity between two I2C buses, providing up to 1 MHz operation and compatibility with mixed-voltage applications. It supports up to 400 dominant levels in the I2C environment, with hot-swapping and short circuit protection features. The device also incorporates buffers, series termination and EMI suppression circuitry to ensure reliable communication over a noisy bus. The PCA9517A,118 is ideal for applications requiring interfacing between multiple I2C systems.