PCA9518

Product Folder Sample & Buy Technical Documents Tools & Software Support & Community PCA9518 SCPS132C – JUNE 2006 – REVISED JUNE 2014 PCA9518 Expandable Five-Channel I2C HUB 1 Features 1 Expandable Five-Channel Bidirectional Buffer 400-kHz Fast I2C Bus Operating VCC Range of 3 V to 3.6 V 5-V Tolerant I2C and Enable Input Pins to Support Mixed-Mode Signal Operation Active-High Individual Repeater Enable Inputs Open-Drain Input/Outputs Lockup-Free Operation Supports Multiple Masters Powered-Off High-Impedance I2C Pins I2C Bus and SMBus Compatible Latchup Performance Exceeds 100 mA Per JESD 78 ESD Protection Exceeds JESD 22 – 2000-V Human-Body Model (A114-A) – 200-V Machine Model (A115-A) – 1000-V Charged-Device Model (C101) 2 Description The PCA9518 is an expandable five-channel bidirectional buffer for I2C and SMBus applications. The I2C protocol requires a maximum bus capacitance of 400 pF, which is derived from the number of devices on the I2C bus and the bus length. The PCA9518 overcomes this restriction by separating and buffering the I2C data (SDA) and clock (SCL) lines into multiple groups of 400-pF segments. Any segment-to-segment transition sees only one repeater delay. Each PCA9518 can communicate with other PCA9518 hubs through a 4wire inter-hub expansion bus. Using multiple PCA9518 parts, any width hub (in multiples of five) can be implemented using the expansion pins, with only one repeater delay and no functional degradation of the sy...