PCA9674AD,512

I/o Expanders Overview

The PCA9674AD,512 is an NXP remote 8-bit I/O expander for the Fm+ I2C-bus with interrupt output. It operates between 2.3 V and 5.5 V with 5.5 V tolerant I/Os. The device features a 1 MHz I2C interface, 30 mA SDA sink capability, and latched outputs with 25 mA sink drive for direct LED driving. Total package sink capability is 200 mA. It provides 64 programmable slave addresses via three hardware address pins. The active LOW open-drain interrupt output signals input state changes. Low standby current is 4.5 µA typical. Operating temperature range is -40 °C to +85 °C. ESD protection exceeds 2000 V HBM and 1000 V CDM. Latch-up testing exceeds 100 mA per JEDEC JESD78.

I/o Expanders Feature Summary

• I2C-bus to parallel port expander
• Active LOW open-drain interrupt output
• Readable device ID (manufacturer, device type, and revision)
• Software Reset pushes the device back to Power-On Reset state

I/o Expanders Applications

• LED signs and displays
• Servers
• Key pads
• Industrial control
• Medical equipment

I/o Expanders Procurement Notes

Verify the specific ordering suffix ',512' corresponds to the SO16 tube dry pack configuration as documented in the official NXP datasheet. Confirm that the component matches the standard marking requirements for this package variant. Ensure the supply voltage and I/O tolerance levels align with the target system design before finalizing procurement.

I/o Expanders Selection Notes

Select the PCA9674AD,512 when high-speed Fm+ I2C communication at 1 MHz is required alongside significant LED drive capabilities. This model supports up to 64 unique addresses on a single bus without buffers. Consider the 25 mA per pin and 200 mA total package sink limits for load management. Verify compatibility with existing microcontroller I2C interfaces and interrupt handling logic.

I/o Expanders Part Context

The PCA9674/74A series serves as a functional upgrade to the PCF8574/74A family, offering increased I2C speed and drive strength. While functionally identical to the PCA9674A, the PCA9674 utilizes a non-overlapping address space, allowing mixed deployment on the same bus. The AD suffix indicates the SO16 plastic small outline package variant.

I/o Expanders Replacement Considerations

PCA9674A is a compatible alternative with non-overlapping addresses. PCF8574 and PCA8574 are legacy replacements but lack Fm+ speed and higher drive currents.