NCT5655W

I/o Expanders Overview

The NCT5655W is a 16-bit I2C-bus and SMBus GPIO controller manufactured by Nuvoton Technology Corporation. It provides 16 General Purpose Input/Output pins accessible via a two-wired serial interface compliant with I2C-bus/SMBus protocols. The device operates within a supply voltage range of 2.3 V to 5.5 V and supports clock frequencies from 0 Hz to 400 kHz. It features an interrupt output, polarity inversion registers, and configurable LED and BEEP functions. The component is housed in a TSSOP-24 package and operates across a temperature range of -40 °C to +85 °C.

I/o Expanders Feature Summary

• Provides 16 bits of general-purpose input/output expansion accessible via I2C-bus or SMBus interfaces.
• Supports flexible interrupt notification for system events with configurable level or pulse modes.
• Includes dedicated hardware control for flashing LED outputs and PC beep generation.
• Features noise filters on SCL/SDA inputs and internal power-on reset mechanisms.

I/o Expanders Applications

• Expansion of I/O ports for push buttons and sensors in embedded systems.
• Control of flashing LED indicators and PC beep signals.
• General purpose input/output management in industrial and consumer electronics.

I/o Expanders Procurement Notes

Verify the specific ordering suffix against official documentation to confirm the TSSOP-24 package type. Ensure compatibility with the required I2C/SMBus address configuration using external A0-A2 pins. Confirm that the operating environment remains within the specified voltage and temperature limits for reliable performance.

I/o Expanders Selection Notes

Select the NCT5655W when a TSSOP-24 surface-mount package is required instead of the QFN variant. This model supports up to eight devices sharing the same bus through address pins. It is suitable for applications requiring low standby current and 5 V tolerant I/Os within the standard commercial temperature range.

I/o Expanders Part Context

The NCT5655W belongs to the NCT5655Y/W series of GPIO expanders. It shares identical electrical specifications and functionality with the NCT5655Y, differing only in the physical package format. The W suffix specifically denotes the TSSOP-24 housing, while the Y suffix indicates the QFN-24 option.

I/o Expanders Replacement Considerations

The NCT5655Y serves as a direct functional substitute, offering identical specifications in a QFN-24 package. Verify pinout compatibility and footprint differences before substitution.