PCA9517AD,112

Signal Buffers, Repeaters, Splitters Overview

The PCA9517AD,112 is a CMOS integrated circuit functioning as a level translating I2C-bus repeater. It provides bidirectional buffering for data (SDA) and clock (SCL) lines, enabling voltage translation between Port A (0.9 V to 5.5 V) and Port B (2.7 V to 5.5 V). The device supports Standard-mode and Fast-mode I2C-bus applications up to 400 kHz. It isolates bus capacitance, allowing 400 pF on either side of the device. Key electrical parameters include a maximum propagation delay of 250 ns from Port B to Port A and 300 ns from Port A to Port B. The component operates within an ambient temperature range of -40 °C to +85 °C and features overvoltage tolerant pins.

Signal Buffers, Repeaters, Splitters Feature Summary

• Bidirectional buffering isolates capacitance and enables voltage translation between low voltage and higher voltage I2C-bus segments.
• Active HIGH enable input allows system control over repeater activation during idle states.
• Open-drain inputs and outputs support arbitration and clock stretching across the repeater without lock-up conditions.

Signal Buffers, Repeaters, Splitters Applications

• Translating between 0.9 V and 5.5 V I2C-bus or SMBus applications.
• Extending I2C-bus length by isolating bus capacitance into two halves.
• Connecting multiple masters and slave devices across different voltage domains.

Signal Buffers, Repeaters, Splitters Procurement Notes

Verify the specific ordering suffix against the manufacturer's current catalog to confirm package type and material specifications. Confirm that the component meets the required environmental operating temperatures and voltage ranges for the target application design.

Signal Buffers, Repeaters, Splitters Selection Notes

Select this component when isolation of bus capacitance and voltage translation between 0.9 V and 5.5 V domains is required. Ensure the system frequency does not exceed 400 kHz due to added propagation delays. Verify compatibility with open-drain configurations and pull-up resistor requirements for both ports.

Signal Buffers, Repeaters, Splitters Part Context

The PCA9517A series serves as a functional replacement for the PCA9515/15A in footprint and operation. It offers improved ESD protection exceeding 5500 V HBM compared to the original PCA9517. The device is designed to maintain all I2C-bus system features while providing robust level shifting capabilities.

Signal Buffers, Repeaters, Splitters Replacement Considerations

The PCA9517A is the recommended successor to the PCA9517 for new designs. The PCA9517ADP/DG is functionally identical to the PCA9517ADP but utilizes Dark Green package material.