CAT9555HV6I

Overview

The CAT9555HV6I is a 16-bit I/O expander designed for I2C and SMBus interfaces, manufactured by onsemi. 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 an interrupt output capability and is housed in a TQFN-24 surface-mount package. It functions across an industrial temperature range from -40 °C to +85 °C. This component serves as an interface IC to expand digital input and output lines for embedded systems requiring additional GPIO control via serial communication protocols.

Feature Summary

• Provides 16-bit general-purpose input and output expansion through standard I2C and SMBus serial interfaces.
• Includes dedicated interrupt output functionality to signal state changes to the host processor.
• Supports wide operating voltage ranges compatible with various logic levels without external level shifting.

Applications

• Embedded systems requiring extended GPIO capabilities via serial buses
• Industrial control panels utilizing SMBus communication
• Consumer electronics needing low-pin-count interface solutions

Procurement Notes

Verify part authenticity against official onsemi documentation due to potential obsolescence or discontinuation notices associated with this series. Confirm that the specific suffix matches the required package type and temperature grade. Check current availability status as distribution may be limited. Ensure compliance with RoHS directives if applicable to the target market. Validate pin compatibility before integration into existing PCB layouts.

Selection Notes

Select this component when a 16-bit I/O expansion solution is required over I2C or SMBus interfaces. Compare against similar devices like the PCA9555 for pin-to-pin compatibility if necessary. Consider the TQFN-24 package constraints regarding thermal dissipation and board space. Verify that the 400 kHz clock speed meets system timing requirements. Evaluate power consumption specifications against available supply rails.

Part Context

This part belongs to the CAT9555 family of I/O expanders from onsemi. It shares functional similarities with other members such as the CAT9554 (8-bit) and CAT9555 variants with different packaging options. The HV6I suffix typically denotes specific package and temperature characteristics within the product line. It is distinct from LED dimming variants like the CAT9532 which include additional driver circuitry.

Replacement Considerations

Publicly confirmed substitute part numbers are not explicitly listed in the provided source material. Engineers should verify cross-reference data directly from manufacturer databases or authorized distributors. Potential alternatives may include NXP PCA9555 devices, but electrical parameter matching is required.