CAT9554YI-GT2

Overview

The CAT9554YI-GT2 is an I/O expander manufactured by onsemi, designed for I2C and SMBus serial communication interfaces. It provides eight general-purpose parallel input/output lines within a 16-pin TSSOP surface-mount package. The device operates with a supply voltage range of 2.3 V to 5.5 V and supports clock frequencies up to 400 kHz. It features push-pull outputs capable of sourcing or sinking currents between 8 mA and 24 mA. The component functions reliably across an operating temperature range from -40°C to +85°C and includes power-on reset (POR) functionality.

Feature Summary

• Supports I2C and SMBus serial protocols for efficient system integration
• Provides eight configurable general-purpose digital I/O lines
• Includes interrupt output capability for event-driven processing
• Integrates power-on reset circuitry for reliable initialization

Applications

• Portable consumer electronics requiring extended I/O capabilities
• Industrial control systems utilizing I2C bus architectures
• Embedded devices needing additional digital input/output expansion

Procurement Notes

This component is officially listed as discontinued by the manufacturer. Verification of availability requires checking authorized distributors for remaining stock or secondary market suppliers. Buyers must confirm the specific revision and authenticity through official datasheets and supplier declarations before procurement.

Selection Notes

Select this part when an eight-channel I/O expander with I2C interface is required in a TSSOP-16 package. Ensure the system voltage aligns with the 2.3 V to 5.5 V operating range. Verify that the 400 kHz maximum clock speed meets the communication requirements of the host controller.

Part Context

The CAT9554YI-GT2 belongs to the CAT9554 series of I/O expanders from onsemi. This series typically offers similar functionality across different package options, such as TSSOP and QFN variants. The 'YI' suffix generally denotes specific temperature and packaging characteristics within the product line.

Replacement Considerations

Direct substitutes include other parts within the CAT9554 family, such as the CAT9554AYI-GT2 or CAT9554HV4I-GT2, provided pin compatibility and electrical specifications match the design requirements.