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CD74AC138E

CD74AC138E Description

The CD74AC138E is a high-performance 1-of-8 decoder/demultiplexer from Harris Corporation, part of the 74AC series. Designed for through-hole mounting (16-DIP package), this IC operates over a wide voltage range (1.5V to 5.5V), making it versatile for mixed-voltage systems. It features a single-supply design with 24mA output current (sink/source), ensuring robust signal integrity in demanding applications. The device is obsolete but remains relevant for legacy designs requiring reliable decoding functionality. Its 3:8 decoding logic enables efficient address decoding, data routing, and memory selection in digital systems.

CD74AC138E Features

• High-Speed Operation: Optimized for AC-series performance, offering low propagation delay and high noise immunity.
• Wide Voltage Range (1.5V–5.5V): Compatible with TTL and CMOS logic levels, ideal for mixed-voltage environments.
• Balanced Output Drive (24mA): Symmetrical high/low output current supports bidirectional applications.
• Low Power Consumption: Advanced CMOS technology minimizes static and dynamic power dissipation.
• Single-Circuit Design: Independent 1 x 3:8 decoder/demultiplexer simplifies system integration.
• Through-Hole Package (16-DIP): Robust mechanical design for prototyping and industrial use.

CD74AC138E Applications

• Memory Systems: Address decoding in SRAM, EPROM, and flash memory interfaces.
• Data Routing: Multiplexed bus systems and peripheral selection in microcontrollers.
• Industrial Control: Logic expansion and signal demultiplexing in PLCs and automation.
• Telecom Equipment: Channel selection and signal distribution in legacy communication hardware.
• Automotive Electronics: Reliable decoding in harsh environments due to wide operating voltage.

Conclusion of CD74AC138E

The CD74AC138E excels in high-speed, low-power decoding tasks, offering superior voltage flexibility and output drive compared to older TTL equivalents. While obsolete, its robust through-hole package and Harris Corporation’s legacy reliability make it a preferred choice for maintenance, repairs, and vintage system designs. Engineers value its balanced performance in mixed-signal systems, ensuring longevity in industrial, automotive, and telecom applications.

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