FST32X245QSPX

Overview

The FST32X245QSPX is a 16-bit bus switch manufactured by onsemi, formerly Fairchild Semiconductor. It operates within a supply voltage range of 4.0V to 5.5V and supports an operating temperature from -40°C to +85°C. The device features a typical on-resistance (RON) of 4Ω at VCC=4.5V with VIN=0V and IIN=30mA, increasing to a maximum of 7Ω under the same conditions. Propagation delay is minimal, typically 0.25ns. Input leakage current is ±1.0µA max at VCC=5.5V. The package is MQA40A, a 40-lead Quarter Size Very Small Outline Package.

Feature Summary

• Provides 16 bits of high-speed CMOS TTL-compatible bus switching in a standard flow-through mode.
• Low on-resistance allows inputs to connect to outputs without adding propagation delay or generating additional ground bounce noise.
• Control inputs are compatible with TTL levels, ensuring seamless integration with standard logic families.

Applications

• High-speed data bus switching applications requiring low latency.
• Systems utilizing TTL-compatible logic interfaces for signal routing.
• Portable electronic devices where low power consumption and small form factor are critical.

Procurement Notes

Verify the specific ordering code suffix 'QSP' corresponds to the MQA40A package variant as documented in the datasheet. Confirm that the component meets the required automotive or industrial temperature ranges if applicable, noting the specified -40°C to +85°C operating limit. Ensure compatibility with the 4.0V to 5.5V supply voltage requirements for your target application design.

Selection Notes

Select this component when a 16-bit bidirectional bus switch is needed with minimal propagation delay. The low on-resistance makes it suitable for maintaining signal integrity across long traces. Consider the QVSOP package size for space-constrained designs. Verify that the input voltage levels align with the TTL-compatible control requirements specified in the electrical characteristics table.

Part Context

This device belongs to the FST series of bus switches, designed for high-speed data transfer. It serves as a 16-bit version of the FST3245, offering enhanced channel density. The technology leverages CMOS processes to achieve low power consumption while maintaining fast switching speeds. It is part of onsemi's broader portfolio of standard logic and interface solutions.

Replacement Considerations

The FST32X245 is explicitly noted as the 16-bit version of the FST3245. When substituting, ensure the replacement device matches the 40-lead MQA40A package dimensions and pinout configuration. Verify that the replacement maintains similar on-resistance and propagation delay specifications to preserve circuit timing and signal integrity.

FAQ

What is the package type for the FST32X245QSPX?

The FST32X245QSPX is housed in a 40-Lead Quarter Size Very Small Outline Package (QVSOP), designated as package number MQA40A.

How does the OE pin control the switch state?

When the OE (Bus Switch Enable) pin is LOW, the switch is ON, connecting Port A to Port B. When OE is HIGH, the switch is OPEN, creating a high-impedance state between the two ports.

What is the typical propagation delay of the switch?

The typical propagation delay through the switch is 0.25 ns, contributing no significant delay other than the RC delay of the on-resistance and load capacitance.