PCA9554ADB,118

I/o Expanders Overview

The PCA9554ADB,118 is an 8-bit I2C-bus and SMBus I/O expander manufactured by NXP Semiconductors. It provides General Purpose parallel Input/Output (GPIO) expansion for applications requiring additional control lines. The device operates within a supply voltage range of 2.3 V to 5.5 V and supports clock frequencies up to 400 kHz. It features 5 V tolerant I/Os, an active LOW interrupt output, and noise filters on SCL/SDA inputs. The component is housed in an SSOP16 package (SOT338-1) and functions across an ambient temperature range of -40 °C to +85 °C.

I/o Expanders Feature Summary

• Provides 8 bits of GPIO expansion with individual pin configuration via Configuration register
• Features an open-drain interrupt output activated when input states change
• Includes polarity inversion capability for read data through the Polarity Inversion register
• Supports hardware-selectable I2C addresses using three address pins

I/o Expanders Applications

• ACPI power switches
• Sensor interface expansion
• Push button matrix scanning
• LED driver control
• Fan speed monitoring

I/o Expanders Procurement Notes

Verify the specific ordering suffix ',118' corresponds to the reel packing method required for your assembly line. Confirm that the SSOP16 package dimensions align with your PCB footprint design rules. Ensure the fixed I2C address associated with the 'ADB' variant matches your system bus topology to prevent conflicts with other devices.

I/o Expanders Selection Notes

Select this part when a distinct I2C slave address from the standard PCA9554 is required to maximize bus capacity. The SSOP16 package offers a compact form factor suitable for space-constrained designs. Verify that the 5 V I/O tolerance meets the voltage levels of the connected peripherals without requiring level shifting circuitry.

I/o Expanders Part Context

This component belongs to the PCA9554 family, which enhances the PCF8574 series with higher drive capability and lower supply current. The 'ADB' designation specifically identifies the PCA9554A variant packaged in SSOP16. This variant shares the same functional architecture as the PCA9554 but utilizes a different fixed I2C address base, allowing mixed deployment on the same bus.

I/o Expanders Replacement Considerations

PCA9554AD,118 serves as a direct functional substitute if the standard PCA9554 address map is acceptable. Other variants within the PCA9554/PCA9554A family may be used provided the I2C address conflict is resolved and the package type is compatible with the existing PCB layout.