PCA6408AHKX

I/o Expanders Overview

The PCA6408AHKX is an 8-bit I/O expander from NXP USA Inc. utilizing the XQFN16 package. It operates on a dual power supply: VDD(I2C-bus) and VDD(P), both ranging from 1.65 V to 5.5 V. The device supports Fast-mode I2C communication at a maximum clock frequency of 400 kHz. It features an active LOW reset input, an open-drain interrupt output, and bidirectional voltage level translation capabilities between the interface and port sides.

I/o Expanders Feature Summary

• Bidirectional voltage-level translation between I2C bus and Port P
• Open-drain interrupt output for state change notification
• Active LOW hardware reset input
• Programmable I2C address via ADDR pin

I/o Expanders Applications

• Battery-powered mobile applications requiring minimal interconnections
• Interfacing sensors, push buttons, and keypads to microcontrollers
• Connecting processors running at one voltage level to peripherals at a different voltage level

I/o Expanders Procurement Notes

Verify the specific ordering part number PCA6408AHKX against the datasheet Table 2 to confirm the XQFN16 package and reel packing method. Ensure the ambient temperature range matches the application requirements of -40 °C to +85 °C. Confirm that the minimum order quantity aligns with procurement constraints.

I/o Expanders Selection Notes

Select this component when mixed-signal environments require seamless communication between low-voltage microprocessors and higher-voltage peripherals. The dual power rail design allows independent voltage selection for the I2C interface and the I/O ports. Verify that the required I/O count does not exceed eight channels.

I/o Expanders Part Context

This part belongs to the PCA6408A series of low-voltage I2C-bus and SMBus I/O expanders. The 'HK' suffix specifically denotes the XQFN16 plastic, extremely thin quad flat package variant. Other variants in the series include HVQFN16 and TSSOP16 packages.

I/o Expanders Replacement Considerations

Direct replacements within the same family include PCA6408ABS (HVQFN16) and PCA6408APW (TSSOP16). These share identical electrical characteristics and functionality but differ only in physical package dimensions.