PCA9515AD,112

Signal Buffers, Repeaters, Splitters Overview

The PCA9515AD,112 is a CMOS integrated circuit designed for I2C-bus and SMBus systems. It functions as a dual-channel bidirectional buffer that extends bus length by buffering both SDA and SCL lines, allowing two buses of 400 pF capacitance. The device operates within a supply voltage range of 2.3 V to 3.6 V and features 5.5 V tolerant I/O pins. It supports Standard-mode (100 kHz) and Fast-mode (400 kHz) speeds with propagation delays up to 180 ns. Packaged in an SO8 plastic small outline package (SOT96-1), it includes an active HIGH enable input and provides lock-up free operation.

Signal Buffers, Repeaters, Splitters Feature Summary

• Extends I2C-bus and SMBus systems by buffering data and clock lines to accommodate higher capacitance loads
• Supports arbitration and clock stretching across the repeater without degrading system performance
• Features powered-off high-impedance I2C-bus pins to prevent interference when unpowered
• Includes an active HIGH enable input with internal pull-up for isolating specific bus segments

Signal Buffers, Repeaters, Splitters Applications

• Isolating a 5 V I2C-bus from a 3.3 V I2C-bus master or slave
• Separating a 400 kHz bus segment from a 100 kHz bus segment
• Extending bus length beyond the standard 400 pF capacitance limit

Signal Buffers, Repeaters, Splitters Procurement Notes

Verify the ordering suffix '112' corresponds to tube packaging rather than tape and reel. Confirm the manufacturer source is NXP Semiconductors, as Texas Instruments also produces equivalent parts under different suffixes. Ensure the datasheet revision matches the required specifications for your design.

Signal Buffers, Repeaters, Splitters Selection Notes

Select this component when extending I2C-bus capacitance limits or isolating voltage domains between 2.3 V and 5.5 V. Ensure the application does not require cascading multiple PCA9515A devices in series, as this configuration is unsupported. Verify that the SO8 package dimensions fit the PCB layout constraints.

Signal Buffers, Repeaters, Splitters Part Context

The PCA9515A series consists of dual bidirectional I2C-bus and SMBus repeaters. The 'AD' designation indicates the SO8 package variant. Other variants include ADP for TSSOP8 and ATP for HWSON8 packages. These components are part of the broader PCA95xx family of interface buffers and switches.

Signal Buffers, Repeaters, Splitters Replacement Considerations

Texas Instruments offers the PCA9515ADR and PCA9515ADGKR as functionally similar dual bidirectional I2C bus repeaters. Verify pinout compatibility and electrical characteristics before substitution.