PCA9554AN,112

I/o Expanders Overview

The PCA9554AN,112 is an 8-bit I/O expander for I2C-bus and SMBus applications. It operates within a supply voltage range of 2.3 V to 5.5 V and supports clock frequencies up to 400 kHz. The device features 5 V tolerant I/Os, an active LOW interrupt output, and low standby current. It includes noise filters on SCL/SDA inputs and internal power-on reset. ESD protection exceeds 2000 V HBM and 1000 V CDM. The component is housed in a SO16 plastic small outline package (SOT162-1) with a body width of 7.5 mm.

I/o Expanders Feature Summary

• Provides 8 bits of general-purpose parallel input/output expansion via I2C/SMBus interface
• Features individual I/O configuration allowing pins to be set as inputs or outputs
• Includes polarity inversion register for flexible active HIGH or LOW operation
• Generates open-drain interrupt signal when configured input states change

I/o Expanders Applications

• ACPI power switches
• Sensor interfaces
• Push button detection
• LED control
• Fan management

I/o Expanders Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm package type and marking standards. Confirm that the procurement channel provides valid traceability for the component batch. Ensure compliance with RoHS directives and check for any end-of-life notifications prior to finalizing orders.

I/o Expanders Selection Notes

Select this component when 8-bit GPIO expansion is required on an I2C bus with 5 V tolerance. Verify that the system controller can accommodate the necessary software changes due to enhanced features compared to legacy PCF8574 series devices. Ensure the application environment stays within the specified -40 °C to +85 °C operating temperature range.

I/o Expanders Part Context

This part belongs to the PCA9554 family developed to enhance NXP Semiconductors' I2C-bus I/O expanders. It offers higher drive capability and lower supply current than previous generations. The PCA9554AN variant specifically utilizes the SO16 package format, distinguishing it from TSSOP or HVQFN versions within the same functional family.

I/o Expanders Replacement Considerations

The PCA9554APW,112 serves as a pin-compatible alternative using a TSSOP16 package. Note that while pin-to-pin compatible with PCF8574 series, software modifications are required due to architectural enhancements. Verify address configurations if replacing multiple devices on the same bus.