54AC299LMQB

Overview

The 54AC299LMQB is a high-speed CMOS octal D-type flip-flop with three-state outputs manufactured by National Semiconductor. It features an 18-pin ceramic dual in-line package (CDIP). The device operates on a single 5V supply and supports bidirectional data transfer between the I/O pins and the internal registers. It includes independent clock inputs for each register pair, allowing flexible timing control. The component is designed for military-grade reliability with a specified operating temperature range from -55°C to 125°C.

Feature Summary

• Octal D-type flip-flop architecture providing eight independent storage elements
• Three-state output capability for direct bus interfacing without external buffers
• Bidirectional data path supporting simultaneous input and output operations
• Military-grade ceramic packaging ensuring stability in extreme thermal environments

Applications

• High-reliability military communication systems requiring radiation-hardened logic
• Aerospace data acquisition modules operating under severe thermal conditions
• Industrial control buses demanding isolated three-state signal routing
• Test equipment interfaces requiring precise synchronous data latching

Procurement Notes

Verify the specific manufacturer lot code and date code upon receipt, as National Semiconductor assets were acquired by Texas Instruments. Confirm that the ceramic package integrity matches Mil-Prf-38535 standards if the application requires strict environmental compliance. Ensure the part number suffix corresponds exactly to the 18-pin CDIP configuration to avoid pinout mismatches during integration.

Selection Notes

Select this component when designing systems that require robust, high-speed data storage with bidirectional capabilities in harsh environments. The ceramic package is essential for applications exceeding standard commercial temperature limits or requiring hermetic sealing. Consider the three-state outputs for simplifying bus architectures where multiple devices share common data lines without additional tri-state buffer components.

Part Context

This device belongs to the AC series of high-speed CMOS logic, offering performance comparable to older TTL families while maintaining lower power consumption. The 54-prefix indicates military-grade qualification, distinguishing it from commercial 74-series counterparts. As an octal flip-flop, it consolidates multiple storage functions into a single package, reducing board space and interconnect complexity in dense digital designs.