CAT9555HV6I-T2

Overview

The CAT9555HV6I-T2 is a 16-bit I/O expander from onsemi, designed for I2C and SMBus interfaces. It features an interrupt output capability and operates within a supply voltage range of 2.3 V to 5.5 V. The device supports high-speed clock frequencies up to 400 kHz and includes power-on reset (POR) functionality. It is housed in a TSSOP-24 package suitable for surface mount applications. The component functions as a general-purpose input/output port with configurable polarity inversion registers.

Feature Summary

• Provides 16 bidirectional I/O lines accessible via standard I2C/SMBus protocols
• Includes dedicated interrupt output pin for efficient host notification of input changes
• Features internal power-on reset circuitry to ensure reliable initialization upon power-up

Applications

• Portable devices requiring extended GPIO capabilities
• Industrial control systems utilizing I2C communication
• Consumer electronics with limited microcontroller pins

Procurement Notes

Verify the specific suffix 'T2' against official datasheets to confirm tape-and-reel packaging details. Confirm RoHS compliance status through current manufacturer documentation. Check for any product discontinuance notices or lifecycle changes associated with this specific part number variant before finalizing procurement plans.

Selection Notes

Select this component when a 16-bit expansion solution is required with interrupt support. Ensure the system voltage aligns with the 2.3 V to 5.5 V operating range. Verify that the TSSOP-24 package fits the PCB layout constraints. Compare against similar parts like the CAT9555YI if different packaging or speed grades are needed.

Part Context

This part belongs to the CAT9555 family of I/O expanders. It shares functional similarities with other Catalyst and onsemi I2C expanders but offers specific voltage and package variations. The HV designation typically indicates specific electrical characteristics or robustness levels compared to standard variants within the same series.

Replacement Considerations

Direct substitutes include the CAT9555YI-T2 for identical functionality in a TSSOP-24 package. Cross-reference with NXP PCA9555 devices for pin-compatible alternatives. Verify register compatibility and interrupt logic when substituting with generic I2C expanders.