PCA9554TS,118

I/o Expanders Overview

The PCA9554TS,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 embedded applications. 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 an active LOW interrupt output, polarity inversion register, and noise filters on SCL/SDA inputs. The component is housed in a 20-lead SSOP package (SOT266-1) with an operating temperature range from -40 °C to +85 °C.

I/o Expanders Feature Summary

• Provides 8 bits of GPIO expansion via I2C/SMBus interface
• Features open-drain interrupt output for input state change notification
• Includes polarity inversion register for logic level adaptation
• Supports hardware-selectable addresses via A0, A1, and A2 pins

I/o Expanders Applications

• ACPI power switches
• Sensor interfaces
• Push button arrays
• LED control circuits
• Fan speed monitoring

I/o Expanders Procurement Notes

Verify the specific ordering suffix '118' corresponds to the reel packing method as documented in the manufacturer's ordering information table. Confirm that the SSOP20 package variant matches the required PCB footprint dimensions. Ensure compliance with RoHS directives and check for any automotive qualification requirements if applicable to the target system environment.

I/o Expanders Selection Notes

Select this part when 8 additional bidirectional I/O lines are required on an I2C bus. The fixed slave address prefix distinguishes it from the PCA9554A variant, allowing mixed usage on the same bus. Consider the 20-pin SSOP package constraints regarding board space and thermal dissipation limits compared to smaller packages like TSSOP or HVQFN.

I/o Expanders Part Context

This component belongs to the PCA9554 family of CMOS I/O expanders designed to enhance standard I2C capabilities. It serves as a drop-in replacement for legacy PCF8574 series devices, though software modifications are necessary due to enhanced features such as higher drive capability and individual I/O configuration registers.

I/o Expanders Replacement Considerations

Direct pin-to-pin replacements include other variants within the PCA9554 family such as PCA9554PW or PCA9554AD. For different package requirements, consider PCA9554BS or PCA9554DB. Verify that substitute parts maintain the same I2C address structure and register mapping to ensure software compatibility.