PCA9517D,112

Signal Buffers, Repeaters, Splitters Overview

The PCA9517D,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 two buses of 400 pF capacitance while isolating voltage levels. The device translates between low voltage (0.9 V to 5.5 V on A-side) and higher voltage (2.7 V to 5.5 V on B-side). It supports Standard mode and Fast mode I2C-bus devices up to 400 kHz. The component operates within an ambient temperature range of -40 °C to +85 °C and features powered-off high-impedance pins.

Signal Buffers, Repeaters, Splitters Feature Summary

• Bidirectional buffering 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
• Lock-up free operation with active HIGH repeater enable input
• Supports arbitration and clock stretching across the repeater

Signal Buffers, Repeaters, Splitters Applications

• Level shifting between low voltage (down to 0.9 V) and higher voltage (2.7 V to 5.5 V) I2C-bus applications
• Extension of I2C-bus by providing bidirectional buffering for both data and clock lines
• Isolating two halves of a bus for both voltage and capacitance in SMBus systems

Signal Buffers, Repeaters, Splitters Procurement Notes

Verify the specific package variant against the ordering information table. The 'D' suffix indicates the SO8 plastic small outline package (SOT96-1). Confirm that the application requirements align with the B-side supply voltage minimum of 2.7 V and the A-side minimum of 0.9 V. Ensure the enable pin logic matches the active HIGH requirement for system control.

Signal Buffers, Repeaters, Splitters Selection Notes

Select this component when isolation between different voltage domains is required without degrading I2C performance. It serves as a footprint and functional replacement for the PCA9515/15A series. Consider the propagation delays specified in the dynamic characteristics table when designing for maximum bus speeds near 400 kHz. Verify that pull-up resistors are sized appropriately for each side of the repeater.

Signal Buffers, Repeaters, Splitters Part Context

The PCA9517D,112 belongs to the PCA9517 family of level translating I2C-bus repeaters manufactured by NXP Semiconductors. This family includes variants such as the PCA9517DP (TSSOP8 package). The D suffix specifically denotes the SO8 package version. The device is designed to accommodate multiple masters and Standard/Fast mode devices.

Signal Buffers, Repeaters, Splitters Replacement Considerations

The datasheet identifies the PCA9517 as a footprint and functional replacement for the PCA9515 and PCA9515A devices.