CAT9555HV6I-GT2

Overview

The CAT9555HV6I-GT2 is a 16-bit I/O expander designed for I2C and SMBus interfaces, manufactured by onsemi. It features two 8-bit configuration and I/O ports (Port 0 and Port 1) with interrupt capabilities. The device operates within a supply voltage range of 2.3 V to 5.5 V and supports standard, fast, and high-speed modes. It is housed in a TQFN-24 package suitable for surface mount applications. The component includes configurable pull-up resistors and open-drain interrupt outputs. Operating temperatures range from -40°C to +85°C.

Feature Summary

• Supports I2C and SMBus communication protocols with interrupt functionality
• Provides 16 general-purpose digital input/output pins divided into two 8-bit ports
• Operates across a wide voltage range compatible with various logic levels

Applications

• Portable devices requiring additional I/O lines
• Industrial control systems needing remote I/O expansion
• Consumer electronics utilizing I2C/SMBus buses

Procurement Notes

Verify the specific suffix 'GT2' against official datasheets to confirm tape-and-reel packaging requirements. Check for obsolescence notices as this part number may be discontinued or superseded by newer revisions. Ensure compatibility with existing PCB footprints for the TQFN-24 package before procurement.

Selection Notes

Select this component when a 16-bit I/O expander with interrupt support is required for I2C/SMBus systems. Compare with the CAT9554 series if only 8 bits are needed. Verify voltage level compatibility between the host controller and the expander inputs. Consider power consumption specifications relative to system battery life constraints.

Part Context

This part belongs to the CAT9555 family of I/O expanders from onsemi. It serves as a digital interface solution for expanding microcontroller I/O capabilities over serial buses. Similar parts include the CAT9554 (8-bit) and NXP PCA9555 equivalents. The HV variant typically indicates high-voltage tolerance or specific electrical characteristics defined in the datasheet.

Replacement Considerations

Check for direct pin-to-pin replacements such as the NXP PCA9555. Verify register compatibility and interrupt polarity settings. Confirm that alternative suppliers offer the same TQFN-24 package and operating temperature range.