PCA9617ATPZ

Signal Buffers, Repeaters, Splitters Overview

The PCA9617ATPZ is a CMOS integrated circuit manufactured by NXP USA Inc., functioning as a level-translating Fast-mode Plus I2C-bus repeater. It provides bidirectional buffering for SDA and SCL lines, enabling voltage translation between Port A (0.8 V to 5.5 V) and Port B (2.2 V to 5.5 V). The device supports bus capacitance of up to 540 pF at 1 MHz or 4000 pF at lower speeds. Operating within an ambient temperature range of -40 °C to +85 °C, it utilizes an active HIGH enable pin referenced to VCC(B). The component is housed in an HWSON8 package with dimensions of 2 x 3 x 0.8 mm.

Signal Buffers, Repeaters, Splitters Feature Summary

• Bidirectional buffering isolates bus capacitance while translating voltage levels between low-voltage and higher-voltage domains without degrading system performance.
• Supports Standard-mode, Fast-mode, and Fast-mode Plus I2C-bus devices, SMBus, PMBus, and multiple controllers with latching-free operation.
• Features powered-off high-impedance pins that are overvoltage tolerant to 5.5 V even when unpowered.

Signal Buffers, Repeaters, Splitters Applications

• Connecting system controllers running on one voltage domain to target devices on a different voltage domain.
• Extending I2C buses by isolating two halves of the bus for both voltage and capacitance management.
• Driving short cables or connecting cards in series configurations where arbitration and clock stretching must be supported across the repeater.

Signal Buffers, Repeaters, Splitters Procurement Notes

Verify the ordering part number PCA9617ATPZ corresponds to the HWSON8 package type. Confirm the minimum order quantity is 4000 units per reel. Ensure the temperature range matches the application requirement of -40 °C to +85 °C. Check for RoHS compliance and REACH SVHC status D indicator. Validate that the package marking P7A aligns with the specific batch requirements.

Signal Buffers, Repeaters, Splitters Selection Notes

Select this component when interfacing between a low-voltage side (down to 0.8 V) and a higher-voltage side (starting at 2.2 V). Ensure the design accommodates the static offset on Port B drivers which prevents connection to other buffers with static offsets. Verify that the enable pin logic is compatible with the system control requirements, noting that state changes are only permitted during idle bus conditions.

Signal Buffers, Repeaters, Splitters Part Context

This part belongs to the PCA9617A family of level-translating Fm+ I2C-bus repeaters. It serves as a footprint and functional replacement for the PCA9517A at Fast-mode speeds. The device is designed to maintain all operating modes and features of the I2C-bus system during level shifts, allowing flexible system architecture designs involving multiple controllers and targets.

Signal Buffers, Repeaters, Splitters Replacement Considerations

The PCA9517A is documented as a functional replacement candidate for Fast-mode speeds. Other potential substitutes include the TCA9617ADGKR from Texas Instruments, though verification of electrical compatibility and pinout alignment is required before substitution.