74FST3245QSR

Overview

The onsemi 74FST3245QSR is an 8-bit bus switch designed for high-performance applications. It operates within a supply voltage range of 4.0 V to 5.5 V and features CMOS/TTL compatibility. The device provides bidirectional data transfer between Port A and Port B, controlled by the OE pin. It exhibits extremely low on-resistance (RON) and nearly zero propagation delay, contributing minimal noise or ground bounce to the system.

Feature Summary

• Provides bidirectional switching for 8-bit data buses with low on-resistance.
• Features nearly zero propagation delay through the switch path.
• Control inputs are compatible with both TTL and CMOS logic levels.
• Pin-for-pin compatible with QS3245, FST3245, and CBT3245 devices.

Applications

• High-speed data bus switching in digital systems
• Bidirectional level translation between different logic families
• System interconnects requiring low signal distortion

Procurement Notes

Verify that the specific suffix 'QSR' corresponds to the QSOP-20 package variant as documented in the ordering information table. Confirm that the component meets the required operating temperature range of -40°C to +85°C for your application environment. Ensure control inputs are tied to valid logic levels rather than left open to prevent undefined states.

Selection Notes

Select this component when low propagation delay and minimal signal integrity impact are critical requirements. It is suitable for replacing legacy bus switches like the FST3245 without redesigning the PCB footprint. Consider the 4.0V minimum supply voltage constraint when designing power rails compared to standard 5V-only devices.

Part Context

This part belongs to the 74FST series of high-speed bus switches manufactured by onsemi. The series focuses on maintaining signal integrity while providing efficient data routing across multiple channels. The 74FST3245 specifically addresses applications needing fast switching speeds with low power consumption.

Replacement Considerations

The datasheet confirms pin-for-pin compatibility with the QS3245, FST3245, and CBT3245. These parts can be substituted directly if electrical characteristics meet the design specifications.