PCA9508D,112

Signal Buffers, Repeaters, Splitters Overview

The PCA9508D,112 is a CMOS integrated circuit designed as a hot-swappable level translating I2C-bus repeater. It provides bidirectional buffering for data (SDA) and clock (SCL) lines, supporting voltage translation between a low-voltage side (VCC(A)) ranging from 0.9 V to 5.5 V and a high-voltage side (VCC(B)) ranging from 2.7 V to 5.5 V. The device accommodates Standard-mode and Fast-mode I2C-bus devices up to 400 kHz. It features offset-free hot-swap capability with IDLE/STOP detect circuitry, allowing insertion into live backplanes without bus contention. The component operates within an ambient temperature range of -40 °C to +85 °C and is housed in an SO8 plastic small outline package.

Signal Buffers, Repeaters, Splitters Feature Summary

• Supports zero-offset hot-swap operations using internal IDLE/STOP detect circuitry to prevent bus corruption during card insertion.
• Provides bidirectional buffering and voltage level translation between adjustable low-voltage (down to 0.9 V) and higher-voltage (up to 5.5 V) I2C or SMBus systems.
• Enables isolation of two bus halves for both voltage and capacitance, allowing up to 400 pF on either side of the device.

Signal Buffers, Repeaters, Splitters Applications

• Connecting I/O cards to live backplanes without corrupting data and clock buses.
• Extending I2C-bus systems by isolating bus segments for voltage translation and capacitance management.
• Facilitating communication between system masters running at different supply voltages, such as 3.3 V and 1.2 V.

Signal Buffers, Repeaters, Splitters Procurement Notes

Verify the specific ordering suffix '112' against the manufacturer's current documentation to confirm the package type and tape-and-reel specifications. Confirm that the SO8 package variant aligns with your PCB footprint requirements. Ensure compliance with RoHS directives if applicable to your manufacturing process. Cross-reference the part number with official NXP databases to validate availability status and any potential obsolescence notices.

Signal Buffers, Repeaters, Splitters Selection Notes

Select this component when designing systems requiring hot-swap capabilities without static voltage offsets. It serves as a functional replacement for PCA9515, PCA9515A, PCA9517, and PCA9517A devices. Ensure the application does not connect the B side to other buffers with rise time accelerators or static offsets, as this may cause lock-up conditions. Verify that the A side can be connected directly to other buffers if star topology is required.

Signal Buffers, Repeaters, Splitters Part Context

The PCA9508 belongs to the family of I2C-bus repeaters and hubs manufactured by NXP Semiconductors. It is specifically engineered to address limitations in standard bus buffers by offering adjustable voltage translation and hot-swap protection. The 'D' suffix indicates the SO8 package, while the ',112' suffix typically denotes the specific packaging configuration provided by the distributor.

Signal Buffers, Repeaters, Splitters Replacement Considerations

PCA9515, PCA9515A, PCA9517, and PCA9517A are documented as footprint and functional replacements.