PCA9517ADP,118

Signal Buffers, Repeaters, Splitters Overview

The PCA9517ADP,118 is a CMOS integrated circuit functioning as a level translating I2C-bus repeater. It provides bidirectional buffering for SDA and SCL lines, isolating two bus segments with up to 400 pF capacitance each. The device translates voltage levels between Port A (0.9 V to 5.5 V) and Port B (2.7 V to 5.5 V). It supports Standard-mode and Fast-mode I2C-bus devices, operating at clock frequencies up to 400 kHz. Key electrical parameters include a propagation delay of 170 ns typical, an operating supply current of 1 mA, and a total power dissipation of 100 mW. The component is housed in an 8-lead TSSOP package.

Signal Buffers, Repeaters, Splitters Feature Summary

• Provides bidirectional buffering for both data and clock lines to extend I2C-bus length and isolate capacitance.
• Translates voltage levels between low voltage logic (down to 0.9 V) and higher voltage systems (up to 5.5 V).
• Features overvoltage tolerant pins that remain high-impedance when the device is unpowered.
• Supports arbitration and clock stretching across the repeater without degrading system performance.

Signal Buffers, Repeaters, Splitters Applications

• Connecting a 3.3 V I2C-bus master to a 1.2 V slave device.
• Isolating two halves of an I2C-bus for both voltage and capacitance separation.
• Implementing star topography by connecting multiple Port A sides to a common bus.

Signal Buffers, Repeaters, Splitters Procurement Notes

Verify the specific ordering suffix

Signal Buffers, Repeaters, Splitters Selection Notes

Select this component when designing systems requiring isolation between different voltage domains on an I2C or SMBus network. Ensure the Port A supply voltage meets the minimum threshold of 0.9 V and Port B meets 2.7 V. Consider the maximum clock frequency limitations imposed by the repeater's propagation delays when selecting for high-speed applications.

Signal Buffers, Repeaters, Splitters Part Context

The PCA9517ADP,118 belongs to the PCA9517A family of level translating repeaters. It serves as an improved hot swap and ESD version of the original PCA9517, offering enhanced electrostatic discharge protection exceeding 5500 V HBM. While functionally identical to its predecessor regarding electrical operation, it is recommended for all new designs due to superior robustness.

Signal Buffers, Repeaters, Splitters Replacement Considerations

The PCA9517ADP/DG is functionally equivalent but was initially produced with Dark Green package material. It is a temporary unique orderable part number that will eventually be discontinued as the standard PCA9517ADP transitions to the same material.