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CD74HCT191E

CD74HCT191E Description

The CD74HCT191E is a 4-bit synchronous up/down binary counter from Harris Corporation, part of the 74HCT series of high-speed CMOS logic devices. Designed for through-hole mounting (16-DIP package), it operates within a 4.5V to 5.5V supply range, making it compatible with standard TTL levels while offering lower power consumption. This obsolete but robust IC features synchronous counting with a 30 MHz count rate, ensuring precise timing in digital systems. Its positive-edge triggering and bidirectional counting (up/down) capabilities provide flexibility in various counting applications.

CD74HCT191E Features

• 4-bit binary counter with single-element integration.
• Synchronous operation eliminates counting delays, enhancing accuracy.
• Up/down counting direction control for versatile applications.
• High-speed performance: 30 MHz count rate for rapid data processing.
• Wide voltage range (4.5V–5.5V) ensures compatibility with 5V systems.
• Low power consumption typical of HCT logic family.
• Positive-edge triggered for reliable clock synchronization.
• 16-DIP package for easy prototyping and through-hole PCB designs.

CD74HCT191E Applications

The CD74HCT191E excels in digital counting and frequency division tasks, including:

• Industrial control systems requiring precise event counting.
• Frequency synthesizers and clock dividers in communication equipment.
• Programmable logic controllers (PLCs) for sequence generation.
• Test and measurement instruments needing bidirectional counters.
• Retro-computing and legacy system repairs due to its TTL compatibility.

Conclusion of CD74HCT191E

The CD74HCT191E is a reliable 4-bit synchronous counter offering high-speed operation, bidirectional control, and low power consumption. While obsolete, its robust design and compatibility with 5V systems make it suitable for legacy applications, industrial controls, and educational projects. Engineers value its synchronous timing and versatile counting modes, ensuring precision in digital logic designs. For modern replacements, consider newer HCT-series variants with similar functionality.