I2C Bus Repeater 8-Pin Micro T/R

The PCA9517A is an I2C-bus repeater that provides level shifting between low voltage (down to 0.9 V) and higher voltage (2.7 V to 5.5 V) for I2C-bus or SMBus applications. While retaining all the operating modes and features of the I2C-bus system during the level shifts, it also permits extension of the I2C-bus by providing bidirectional buffering for both the data (SDA) and the clock (SCL) lines, thus enabling two buses of 400 pF. Using the PCA9517A enables the system designer to isolate two halves of a bus for both voltage and capacitance. The SDA and SCL pins are overvoltage tolerant and are high-impedance when the PCA9517A is unpowered. The 2.7 V to 5.5 V bus B side drivers behave much like the drivers on the PCA9515A device, while the adjustable voltage bus A side drivers drive more current and eliminate the static offset voltage. This results in a LOW on the B side translating into a nearly 0 V LOW on the A side which accommodates smaller voltage swings of lower voltage logic. The static offset design of the B side PCA9517A I/O drivers prevents them from being connected to another device that has a rise time accelerator including the PCA9510, PCA9511, PCA9512, PCA9513, PCA9514, PCA9515A, PCA9516A, PCA9517A (port B), or PCA9518. The A side of two or more PCA9517As can be connected together, however, to allow a star topology with the A side on the common bus, and the A side can be connected directly to any other buffer with static or dynamic offset voltage. Multiple PCA9517As can be connected in series, A side to B side, with no build-up in offset voltage with only time-of-flight delays to consider.

• 2 Channel, Bidirectional Buffer Isolates Capacitance and Allows 400 pF on Either Side of the Device
• Voltage Level Translation from 0.9 V to 5.5 V and from 2.7 V to 5.5 V
• Footprint and Functional Replacement for PCA9515/15A
• I2C-bus and SMBus Compatible
• Active HIGH Repeater Enable
• Open-Drain Inputs/Outputs
• Lock-up Free Operation
• Supports Arbitration and Clock Stretching Across the Repeater, and Multiple Masters
• I2C and SMBus SCL Clock Frequency up to 1 MHz (The maximum system operating frequency may be less than 1 MHz because of the delays added by the repeater.)
• Powered-Off High-Impedance I2C-bus Pins
• A Side Operating Supply Voltage Range of 0.9 V to 5.5 V
• B Side Operating Supply Voltage Range of 2.7 V to 5.5 V
• 5 V Tolerant I2C-bus and Enable Pins
• Available in: Micro-8, SOIC8
• ESD Performance: 8 kV HBM, 700 V MM, 2000 V CDM
• These are Pb-Free Devices