PCAL6408AHKX

I/o Expanders Overview

The PCAL6408AHKX is an 8-bit general-purpose I/O expander designed for remote expansion via the I2C-bus interface. It operates within a supply voltage range of 1.65 V to 5.5 V and supports bidirectional voltage-level translation between the SCL/SDA lines and Port P. The device features a 400 kHz fast-mode I2C bus, an open-drain active LOW interrupt output (INT), and an active LOW reset input (RESET). It includes Agile I/O capabilities such as programmable drive strength, latchable inputs, and configurable pullup/pulldown resistors. The component is housed in an XQFN16 package.

I/o Expanders Feature Summary

• Bidirectional voltage-level translation capability between I2C controller and peripheral ports
• Agile I/O features including programmable output drive strength and input latching
• Open-drain interrupt output with status register for identifying interrupt sources
• Integrated noise filters on SCL/SDA inputs and Schmitt trigger action

I/o Expanders Applications

• Battery-powered mobile applications interfacing to sensors or push buttons
• Mixed signal environments requiring communication between incompatible I/O voltages
• Systems needing GPIO expansion while minimizing interconnections

I/o Expanders Procurement Notes

Verify the specific ordering suffix HKX corresponds to the XQFN16 package type and reel packing method. Confirm that the temperature range matches the application requirements of -40 °C to +85 °C. Ensure compatibility with the host system's I2C bus specifications and voltage levels before finalizing procurement.

I/o Expanders Selection Notes

Select this component when pin-to-pin replacement for PCA6408A is required but Agile I/O features are needed. Consider the XQFN16 package dimensions if board space is limited. Verify that the dual power rail configuration (VDD(I2C-bus) and VDD(P)) aligns with the system's available voltage supplies.

I/o Expanders Part Context

The PCAL6408A series belongs to NXP's low-voltage translating I/O expander family. It serves as a software backward-compatible upgrade to the PCA6408A, offering enhanced control over I/O states through additional configuration registers. The AHKX variant specifically denotes the XQFN16 package option within this product line.

I/o Expanders Replacement Considerations

PCAL6408ABSHP is a pin-to-pin compatible alternative in HVQFN16 packaging. PCA6408A is the predecessor model with identical pinout but lacks Agile I/O features.