FST33X257QSP

Overview

The FST33X257QSP is a 24:12 high-speed CMOS TTL-compatible multiplexer/demultiplexer bus switch. It features a low on-resistance of 4Ω typical, allowing inputs to connect to outputs without adding propagation delay or generating ground bounce noise. The device operates with a supply voltage range of 4.0V to 5.5V and supports an operating temperature from -40°C to +85°C. It utilizes a 48-lead Quarter Size Very Small Outline Package (QVSOP).

Feature Summary

• Provides minimal propagation delay through the switch path.
• Ensures zero bounce in flow-through mode operation.
• Control inputs are compatible with TTL logic levels.

Applications

• High-speed data routing in digital systems
• Bus switching applications requiring low noise
• Multiplexing and demultiplexing signal paths

Procurement Notes

Verify the specific ordering code suffix to confirm package type and reel configuration. Ensure the component meets the required thermal and electrical specifications for the intended operating environment. Confirm compatibility with existing design constraints before finalizing procurement decisions.

Selection Notes

Select this component when a 24-to-12 channel multiplexing solution is required with low on-resistance characteristics. Consider the QVSOP package size for space-constrained designs. Verify that the TTL-compatible control inputs align with the system's logic voltage levels.

Part Context

This part belongs to the Fairchild Switch family, which embodies proven switch technology used in previous bus switch products. It is designed to provide efficient signal routing with minimal impact on signal integrity, suitable for various digital interface applications.

Replacement Considerations

Check for direct pin-to-pin replacements within the same product family. Verify that any substitute component matches the 24:12 configuration and package dimensions. Ensure electrical parameters such as on-resistance and propagation delay meet or exceed the original specifications.

FAQ

What is the function of the OE_x pin?

When OE_x is LOW, the select pin connects the A Port to the selected B Port output. When HIGH, the switch is OPEN, creating a high-impedance state between the two ports.

How does the device handle input leakage current?

The input leakage current is specified as ±1.0 µA maximum at VCC = 5.5V and VIN ranging from 0V to 5.5V.