CAT9554AYI-GT2

Overview

The CAT9554AYI-GT2 is an 8-bit I/O expander manufactured by onsemi, designed for I2C and SMBus interfaces. It operates within a supply voltage range of 2.3V to 5.5V and supports clock frequencies up to 400 kHz. The device features push-pull outputs with current capabilities of 10mA and 24mA. It includes an interrupt output function and Power-On Reset (POR) feature. Operating temperatures span from -40°C to +85°C. The component is housed in a 16-TSSOP package with a width of 4.40mm.

Feature Summary

• Supports I2C and SMBus communication protocols for system integration
• Provides interrupt output capability for efficient event handling
• Includes internal Power-On Reset circuitry for reliable initialization

Applications

• Portable equipment requiring low power I/O expansion
• Consumer electronics utilizing I2C/SMBus buses
• Industrial control systems needing remote I/O access

Procurement Notes

Verify the specific suffix GT2 against official datasheets to confirm tape-and-reel packaging and RoHS compliance status. Confirm end-of-life status through manufacturer notifications as availability may be restricted. Ensure the ordering part number matches the required package type and temperature grade before procurement.

Selection Notes

Select this component when an 8-bit parallel I/O expansion is required over an I2C or SMBus interface. Verify that the system voltage falls within the 2.3V to 5.5V operating range. Consider the 16-TSSOP package dimensions for PCB layout constraints. Check if the interrupt functionality aligns with the host controller's polling or interrupt-driven architecture requirements.

Part Context

This part belongs to the CAT9554 family of I/O expanders. Variants such as CAT9554AWI-GT2 and CAT9554YI-GT2 share similar functional characteristics but may differ in package options or manufacturing revisions. The AYI-GT2 specifically denotes the TSSOP-16 package configuration.

Replacement Considerations

Direct substitutes include other parts within the CAT9554 family, such as CAT9554AWI-GT2 or CAT9554YI-GT2, provided pin compatibility and electrical specifications match. Verify package equivalence and interface protocol support before substitution.

FAQ

What is the maximum clock frequency supported by the CAT9554AYI-GT2?

The device supports a maximum clock frequency of 400 kHz for both I2C and SMBus interfaces.

Does the CAT9554AYI-GT2 include an interrupt output?

Yes, the component features an interrupt output pin to signal state changes to the host controller.

What is the operating temperature range for this IC?

The specified operating temperature range is from -40°C to +85°C.