54AC299DMQB

Overview

The 54AC299DMQB is an 8-bit bidirectional shift register from the AC logic family, manufactured by National Semiconductor. It features parallel-in/parallel-out capability and tri-state outputs for bus-driven applications. The device is housed in a 20-lead Ceramic Dual In-Line Package (CDIP) with a 0.300-inch (7.62mm) width. As part of the military-grade 54 series, it supports high-speed data handling and is designed for robust performance in demanding environments.

Feature Summary

• Supports bidirectional shifting and parallel data loading
• Features tri-state outputs to facilitate bus-oriented systems
• Constructed in ceramic packaging for enhanced durability

Applications

• High-speed data handling systems
• Bus-oriented digital circuits
• Military and aerospace electronic equipment

Procurement Notes

Verify the manufacturer origin, as National Semiconductor assets are now managed by Texas Instruments. Confirm the package type is genuine CDIP and check for radiation hardness specifications if used in harsh environments. Ensure the component matches the specific AC series electrical characteristics required for your design.

Selection Notes

Select this component when an 8-bit bidirectional shift register with tri-state outputs is required. The AC series offers higher speed than standard TTL. The CDIP package is suitable for applications requiring superior thermal and mechanical stability compared to plastic variants.

Part Context

This component belongs to the 54AC logic family, which provides high-speed CMOS performance. The '54' prefix indicates military-grade qualification, while 'AC' denotes the advanced CMOS technology. The 'DMQB' suffix typically specifies the ceramic dual in-line package configuration.

FAQ

Is the 54AC299DMQB available in plastic packaging?

No, the DMQB suffix specifically denotes the 20-CDIP ceramic package. Plastic versions may exist under different suffixes.

What is the primary function of the tri-state outputs?

The tri-state outputs allow the device to be disconnected from the system bus when not active, enabling multiple devices to share the same data lines.