PCAL6416AHF,128

I/o Expanders Overview

The PCAL6416AHF,128 is a 16-bit I/O expander from NXP Semiconductors designed for remote I/O expansion via the I2C-bus interface. It features bidirectional voltage-level translation between VDD(I2C-bus) and VDD(P), supporting operating supply voltages from 1.65 V to 5.5 V. The device includes an active LOW reset input, an open-drain interrupt output, and Agile I/O capabilities such as programmable drive strength and pull-up/pull-down resistors. It operates within a temperature range of -40 °C to +85 °C and is housed in a HWQFN24 package.

I/o Expanders Feature Summary

• Bidirectional voltage-level translation allows seamless communication between low-voltage microcontrollers and higher-voltage peripherals.
• Agile I/O features include software backward compatibility with PCA6416A, bank-selectable push-pull or open-drain outputs, and programmable drive strengths.
• Integrated interrupt functionality with maskable interrupts, interrupt status registers, and latched inputs to minimize host response time.

I/o Expanders Applications

• Battery-powered mobile applications requiring sensor and keypad interfacing
• Mixed-signal environments needing GPIO expansion across different voltage domains
• Systems requiring minimal interconnections while expanding processor I/O capabilities

I/o Expanders Procurement Notes

Verify the ordering part number PCAL6416AHF,128 corresponds to the HWQFN24 package type. Confirm the packing method matches Reel 13" Q2/T3 specifications. Ensure the temperature range requirement aligns with the standard -40 °C to +85 °C rating provided in the datasheet.

I/o Expanders Selection Notes

Select this component when pin-to-pin replacement for PCA6416A is required with enhanced Agile I/O features. Consider the HWQFN24 package dimensions (4 mm x 4 mm x 0.75 mm) for PCB layout constraints. Verify that the dual power rail configuration fits the system's voltage translation requirements between the I2C bus and Port P.

I/o Expanders Part Context

This part belongs to the PCAL6416A series, which serves as a low-voltage translating 16-bit I2C-bus/SMBus I/O expander. It is a pin-to-pin drop-in replacement for the PCA6416A but adds Agile I/O features like programmable output drive strength and input latching. The series supports multiple packages including TSSOP24, VFBGA24, and X2QFN24.

I/o Expanders Replacement Considerations

PCAL6416AHF,128 is a direct pin-to-pin replacement for PCA6416A. Note that PCAL6416A powers up with all I/O interrupts masked by default, unlike some predecessors, to prevent spurious interrupts during board bring-up.