PCA9515D,118

Signal Buffers, Repeaters, Splitters Overview

The PCA9515D,118 is a BiCMOS integrated circuit designed for I2C-bus and SMBus systems. It functions as a dual bidirectional buffer to extend bus length and device count by isolating two halves of a bus, each supporting up to 400 pF capacitance. The device operates with a supply voltage range of 3.0 V to 3.6 V and supports clock frequencies from 0 Hz to 400 kHz. It features an active HIGH enable input (EN) and provides 5.5 V tolerance on SCLn, SDAn, and EN pins. The component is housed in an SO8 plastic small outline package (SOT96-1) and operates within an ambient temperature range of -40 °C to +85 °C.

Signal Buffers, Repeaters, Splitters Feature Summary

• Provides two-channel bidirectional buffering for I2C-bus and SMBus data and clock lines.
• Enables lock-up free operation using specific low voltage level offsets between input and output buffers.
• Supports arbitration and clock stretching across the repeater interface.
• Features powered-off high-impedance I2C-bus pins to prevent interference when unpowered.

Signal Buffers, Repeaters, Splitters Applications

• Extending I2C-bus systems by buffering data and clock lines to accommodate more devices or longer cable lengths.
• Connecting buses operating at different voltages, such as a 3.3 V master bus and a 5 V slave bus.
• Isolating a 100 kHz bus segment while allowing a separate 400 kHz bus segment to operate without interference.

Signal Buffers, Repeaters, Splitters Procurement Notes

Verify the ordering suffix '118' against the manufacturer's current documentation to confirm tape and reel packaging specifications. Ensure the selected variant matches the required SO8 package type and industrial temperature range. Cross-reference the datasheet revision date to validate static and dynamic characteristic limits before finalizing procurement orders.

Signal Buffers, Repeaters, Splitters Selection Notes

Select this component when system design requires extending I2C bus capacitance beyond standard limits or bridging distinct voltage domains like 3.3 V and 5 V. Note that multiple PCA9515 units cannot be cascaded in series due to voltage offset propagation issues. Consider the PCA9515A variant if lower supply voltage constraints or reduced input capacitance are critical requirements.

Signal Buffers, Repeaters, Splitters Part Context

The PCA9515D is part of the NXP PCA9515 family of I2C-bus repeaters. The 'D' suffix specifically denotes the SO8 plastic small outline package variant. This family addresses limitations in standard I2C bus topology by providing signal regeneration and voltage translation capabilities essential for complex multi-master or mixed-voltage embedded systems.

Signal Buffers, Repeaters, Splitters Replacement Considerations

The PCA9515A is a related variant offering a wider voltage range of 2.3 V to 3.6 V and lower input capacitance. Verify pin compatibility and functional equivalence before substitution, particularly regarding the enable pin behavior and voltage tolerance specifications.