74FCT825ASPC

Overview

The National Semiconductor 74FCT825ASPC is an octal bus interface flip-flop utilizing FCT CMOS technology. It features eight D-type flip-flops with three-state outputs in a 24-pin CDIP package. The device operates at a supply voltage of 5V, with a propagation delay of 12.5 ns. Output drive capabilities include -32 mA high and 64 mA low currents. It supports single-ended inputs and non-inverting logic within an industrial temperature range of -40°C to +85°C.

Feature Summary

• Octal bus interface architecture for parallel data transfer
• Three-state output capability for bus line sharing
• High-speed FCT CMOS technology for rapid switching
• Industrial grade thermal stability

Applications

• Parallel data buffering in computer systems
• Bus interface circuits for microprocessors
• Register files in digital logic designs
• Data latch applications in instrumentation

Procurement Notes

Verify the manufacturer origin carefully, as Texas Instruments acquired National Semiconductor's logic business. Confirm the specific suffix 'SPC' corresponds to the ceramic DIP package variant. Ensure RoHS compliance status aligns with project requirements, noting that legacy parts may have different environmental certifications than current production lines.

Selection Notes

Select this component when high-speed parallel data storage is required with bus isolation. The FCT series offers superior speed compared to standard 74F logic while maintaining TTL-compatible input levels. Consider the ceramic package for harsh environments requiring robust mechanical integrity and thermal performance over plastic alternatives.

Part Context

This part belongs to the FCT (Fast CMOS Technology) family, designed to bridge the gap between TTL speed and CMOS power efficiency. The 74FCT825 specifically addresses the need for wide-bus interfacing in high-performance computing architectures from the late 1990s and early 2000s era.

Replacement Considerations

• CY74FCT825ATQCT
• CY74FCT825CTQCT

FAQ

What is the maximum output current capability?

The device provides a low-level output current of 64 mA and a high-level output current of -32 mA.

Is the input polarity inverting or non-inverting?

The 74FCT825ASPC features non-inverting logic, where the output state follows the input state upon clocking.