FST3244MTCX

Overview

The FST3244MTCX is an 8-bit bus switch manufactured by onsemi, housed in a 20-lead Thin Shrink Small Outline Package (TSSOP). It operates within a supply voltage range of 4.0 V to 5.5 V and supports an operating temperature range from -40°C to +85°C. The device features two independent four-bit switches with separate output enable inputs (/OE1, /OE2). Key electrical characteristics include a typical switch on-resistance (RON) of 4 Ω at VCC = 4.5 V, a quiescent supply current (ICC) of 3 µA, and a propagation delay of 0.25 ns.

Feature Summary

• Provides eight bits of high-speed CMOS bus switching with minimal propagation delay through the switch connection.
• Features low on-resistance that allows inputs to connect to outputs without adding significant propagation delay or generating additional ground bounce noise.
• Organized as two independent four-bit switches with separate control inputs for flexible port configuration.

Applications

• High-speed data bus switching applications
• Portable systems requiring low power consumption
• Consumer electronics utilizing standard '244 pin-out compatibility

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to ensure correct packaging and temperature grade specifications. Confirm that the component meets all relevant regulatory standards required for the intended application environment before finalizing procurement decisions.

Selection Notes

Select this component when a standard '244 pin-out compatible bus switch is required for 5V logic systems. Consider its low on-resistance and minimal propagation delay for high-speed signal integrity requirements. Ensure the design accommodates the specified 4.0 V to 5.5 V operating voltage range.

Part Context

This part belongs to the FST series of bus switches, designed to replace traditional buffer drivers in applications where bidirectional data flow is necessary. It maintains compatibility with standard logic families while offering improved performance metrics such as lower power consumption and faster switching speeds compared to older technologies.

Replacement Considerations

Check for updated part numbers due to Fairchild Semiconductor integration into ON Semiconductor, where underscores may be replaced by dashes. Verify functional equivalence if substituting with other 8-bit bus switches from different manufacturers.

FAQ

What is the organization of the FST3244 internal switches?

The device is organized as two independent four-bit switches, each controlled by a separate output enable input (/OE1 and /OE2).

How does the FST3244 handle ground bounce noise?

The low on-resistance of the switch allows inputs to be connected to outputs without adding propagation delay or generating additional ground bounce noise.