CAT9534YI-GT2

Overview

The CAT9534YI-GT2 is an 8-bit I/O expander manufactured by onsemi, designed for remote I/O expansion via the I2C and SMBus serial interfaces. It operates within a supply voltage range of 2.3 V to 5.5 V and supports a maximum clock frequency of 400 kHz. The device features configurable input/output pins with a low-level output current capability of 50 mA and a power dissipation rating of 1 W. It is housed in a TSSOP-16 surface-mount package and functions reliably across an industrial temperature range from -40°C to +85°C.

Feature Summary

• Supports bidirectional data transfer through standard I2C and SMBus communication protocols
• Provides eight general-purpose digital input or output ports with configurable direction control
• Includes interrupt output functionality to signal state changes to the host processor

Applications

• Portable consumer electronics requiring additional GPIO pins
• Industrial control systems utilizing I2C/SMBus networks
• Embedded devices needing remote I/O expansion in space-constrained designs

Procurement Notes

Verify the specific suffix 'YI' against official datasheets to confirm package type and temperature grade. Confirm end-of-life status as distributor listings may vary. Ensure compatibility with system voltage levels before integration.

Selection Notes

Select this component when an 8-bit I/O expander with I2C interface is required. Compare against similar models like CAT9534WI-GT2 for package differences. Verify that the 50 mA sink current meets load requirements.

Part Context

This part belongs to the CAT9534 series of I/O expanders. It shares functional similarities with other members of the family but differs in packaging and thermal specifications. It serves as a bridge between microcontrollers and peripheral devices.

Replacement Considerations

Check for direct pin-compatible substitutes such as the CAT9534WI-GT2. Verify electrical parameters match exactly. Consider obsolescence status when planning long-term production runs.