74FST3244DWR2

Overview

The onsemi 74FST3244DWR2 is an 8-bit bus switch housed in a SOIC-20 package. It operates within a supply voltage range of 4.0 V to 5.5 V and supports an operating temperature from -40°C to +85°C. The device features two independent 4-bit switches with separate Output/Enable (OE) pins, providing TTL/CMOS compatible control inputs. Key electrical characteristics include a maximum propagation delay of 0.25 ns, typical on-resistance of 4 ohms at 4.5 V, and nearly zero standby current.

Feature Summary

• Provides high-performance switching with extremely low on-resistance and negligible propagation delay.
• Features two independent 4-bit switches controlled by separate OE pins for flexible signal routing.
• Maintains system integrity by adding no noise or ground bounce during operation.
• Ensures compatibility with standard logic families through TTL/CMOS compatible control inputs.

Applications

• High-speed data bus switching applications
• Signal routing in digital communication systems
• Portable equipment requiring low power consumption

Procurement Notes

Verify the specific ordering suffix matches the required package type, as the DWR2 designation indicates the SOIC-20 variant supplied in tape and reel format. Confirm that the component meets RoHS compliance requirements if applicable to your manufacturing process. Ensure proper handling procedures are followed due to moisture sensitivity level 1 classification.

Selection Notes

Select this component when designing circuits that require fast, bidirectional data transfer between different voltage domains or buses. The dual 4-bit architecture allows for independent control of separate data paths. Consider the low on-resistance for minimizing signal attenuation in high-frequency applications where signal integrity is critical.

Part Context

This part belongs to the 74FST logic family, which is designed for high-speed CMOS applications. It serves as a direct replacement for similar bus switches like the QS3244, FST3244, and CBT3244, offering pin-for-pin compatibility while maintaining the performance standards expected from Fast Switch Technology devices.

Replacement Considerations

The datasheet confirms pin-for-pin compatibility with the QS3244, FST3244, and CBT3244. These parts can be substituted directly without circuit redesign, provided their electrical specifications meet the design requirements.

FAQ

How does the 74FST3244 handle signal inversion?

The device functions as a non-inverting bus switch, meaning the output signal follows the input signal state when the enable pin is active.

What is the impact of the switch on-resistance on signal quality?

The typical on-resistance of 4 ohms at 4.5 V ensures minimal voltage drop across the switch, preserving signal amplitude and reducing distortion in high-speed data lines.