CAT9534YI-G

Overview

The CAT9534YI-G is an 8-bit I/O expander manufactured by onsemi, part of the Catalyst Semiconductor family. It interfaces with microcontrollers via I2C and SMBus protocols. The device operates within a supply voltage range of 2.3 V to 5.5 V and supports a maximum clock frequency of 400 kHz. It features configurable input/output pins with interrupt output capabilities and configuration registers. The component is housed in a 16-pin SOIC package and functions across an industrial temperature range from -40°C to +85°C.

Feature Summary

• Supports bidirectional data transfer through I2C and SMBus serial interfaces
• Includes configuration registers for individual pin direction control
• Provides interrupt output functionality to signal state changes

Applications

• Portable equipment requiring extended I/O capabilities
• Industrial control systems utilizing I2C communication
• Consumer electronics with limited microcontroller pins

Procurement Notes

Verify current availability status as the component may be subject to discontinuation notices. Confirm RoHS compliance details directly with the manufacturer or authorized distributors before procurement. Ensure the specific suffix matches the required package type and operating temperature range for the target application design.

Selection Notes

Select this component when an 8-bit expansion is required for I2C-based systems. Verify that the 2.3 V to 5.5 V supply range aligns with the system power rails. Ensure the host controller supports the standard and fast mode speeds up to 400 kHz. Check for alternative packages if surface mount constraints differ from the SOIC-16 form factor.

Part Context

This part belongs to the CAT9534 logic series, which provides remote I/O expansion for I2C/SMBus applications. The 'YI' suffix typically denotes the SOIC-16 package variant. The manufacturer transitioned from Catalyst Semiconductor to onsemi, maintaining the same functional specifications for this interface IC family.

Replacement Considerations

The TCA9534 from Texas Instruments is a functionally similar 8-bit I2C I/O expander. Verify pin compatibility and register mapping differences before substitution. Other compatible devices within the same category should be evaluated based on voltage ranges and package dimensions.