The TC74HC390AF is a high-speed CMOS dual 4-stage decade counter manufactured by Toshiba Semiconductor and Storage. It consists of two independent 4-stage counters, each capable of dividing the input frequency by 2 and by 5. These counters can be cascaded to create counters with larger division ratios. It's designed for use in frequency dividers, timers, and control circuits. Its high-speed operation and low power consumption make it suitable for various applications.

Applications

• Frequency Dividers: Used to reduce the frequency of input signals for various electronic systems.
• Timers: Employed in timing circuits for precise time interval generation.
• Control Circuits: Implemented in digital control systems for sequencing and counting events.
• Digital Clocks: Utilized in digital clock circuits to divide down the crystal oscillator frequency.
• Instrumentation: Used in measuring instruments for frequency and period measurements.

Features

• Dual 4-Stage Decade Counter: Contains two independent counters in a single package.
• Divide-by-2 and Divide-by-5 Sections: Each counter can divide the input frequency by 2 and by 5.
• High-Speed Operation: Enables fast counting and frequency division.
• Low Power Dissipation: Consumes minimal power, suitable for battery-powered applications.
• Wide Operating Voltage Range: Operates from 2V to 6V.
• Cascadable: Counters can be cascaded for higher division ratios.

Benefits

• Versatile Counting Options: Offers both divide-by-2 and divide-by-5 capabilities.
• Simplified Circuit Design: Integrates two counters into a single package, saving board space.
• Improved System Performance: High-speed operation ensures accurate counting and frequency division.
• Extended Battery Life: Low power consumption makes it suitable for portable devices.
• Increased Design Flexibility: Wide operating voltage range allows for use in diverse systems.
• Expandable Counting Range: Counters can be cascaded to achieve higher division ratios.

Additional Details

The TC74HC390AF contains two independent 4-stage decade counters. Each counter consists of a divide-by-2 section and a divide-by-5 section. The divide-by-2 section is a single flip-flop, and the divide-by-5 section is a 4-stage counter with feedback. The counters are triggered by a negative-going edge of the clock input. Each counter has an individual reset input, which resets the counter to zero when high. The device is available in a SOIC16 package, suitable for surface mount assembly.