PCA9518APW,512

Specialized Overview

The PCA9518APW,512 is a CMOS integrated circuit designed for I2C-bus and SMBus systems. It functions as an expandable five-channel bidirectional hub repeater that buffers both data (SDA) and clock (SCL) lines to extend bus capacitance limits. The device supports Standard-mode and Fast-mode operations with a maximum clock frequency of 400 kHz. It operates within a supply voltage range of 2.3 V to 3.6 V and features 5 V tolerant I/O pins. The component is housed in a TSSOP20 package (SOT360-1) and provides open-drain outputs with active HIGH enable inputs.

Specialized Feature Summary

• Expandable five-channel bidirectional buffer architecture
• Lock-up free operation supporting arbitration and clock stretching
• Powered-off high-impedance state for I2C-bus pins
• Active HIGH individual repeater enable inputs

Specialized Applications

• I2C-bus system expansion beyond standard capacitance limits
• SMBus compatible multi-master environments
• Voltage translation between 3.3 V and 5 V bus segments

Specialized Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm the exact tape-and-reel packaging configuration. Confirm that the TSSOP20 package variant matches the required PCB footprint dimensions and thermal dissipation requirements for the target application environment.

Specialized Selection Notes

Select this component when expanding I2C or SMBus networks requires buffering multiple independent segments without functional degradation. Ensure the design accommodates the necessary pull-up resistors on all enabled ports and expansion pins. Verify that the operating voltage remains within the specified 2.3 V to 3.6 V range to maintain proper logic thresholds and timing characteristics.

Specialized Part Context

This part belongs to the PCA9518A series, which represents a wider voltage range version of the original PCA9518. It improves partial power-down performance by maintaining high-impedance states when VDD drops below 2.0 V. The 'A' designation distinguishes it from earlier iterations regarding voltage tolerance and low-voltage behavior.

Specialized Replacement Considerations

The PCA9518AD serves as a pin-compatible alternative utilizing an SO20 package instead of TSSOP20. Other PCA9518 variants may differ in package type or voltage specifications; verify datasheet compatibility before substitution.