CAT9555HV6I-G

Overview

The CAT9555HV6I-G is a CMOS I/O expander manufactured by onsemi, designed for I2C and SMBus interfaces. It provides sixteen general-purpose digital input/output ports within a TQFN-24 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 an interrupt output capability and functions across an industrial temperature range from -40°C to +85°C. The component draws a maximum operating current of 160 mA and is classified under Interface ICs.

Feature Summary

• Provides sixteen configurable digital I/O lines accessible via standard I2C or SMBus protocols.
• Includes an interrupt output pin to signal state changes to the host processor without continuous polling.
• Operates reliably across a wide voltage range and extended industrial temperature conditions.

Applications

• Embedded systems requiring additional GPIO pins for sensor interfacing or control logic.
• Industrial automation controllers needing expanded input/output capabilities in compact form factors.
• Consumer electronics devices utilizing I2C/SMBus communication for peripheral management.

Procurement Notes

This component is officially discontinued as indicated by the EOL notice dated Q2 2014. Availability is restricted, and existing stock may be limited. Verify end-of-life status and last-time buy options before design finalization. Ensure compliance with RoHS directives and confirm package integrity upon receipt due to potential long-term storage effects.

Selection Notes

Select this part only if legacy compatibility with the CAT9555 series is required. Consider newer alternatives like the NLA9555 for active production support. Verify that the TQFN-24 footprint matches the PCB layout. Confirm that the 2.3 V minimum supply voltage aligns with the system power rails. Check if the 160 mA current draw fits the thermal budget.

Part Context

The CAT9555HV6I-G belongs to the CAT9555 family of I/O expanders from onsemi. It shares functional similarities with other members such as the CAT9554 and CAT9556 but offers specific pin counts and packaging options. The HV6 suffix denotes the TQFN-24 package variant. This series targets applications needing cost-effective expansion of microcontroller I/O resources over serial buses.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. The NLA9555 is listed as a modern I/O port expander alternative but requires verification of pinout and register compatibility. Consult official obsolescence notices for recommended replacement strategies.