The HD74LS90P is a decade counter manufactured by Hitachi, Ltd. It's a monolithic counter that provides a divide-by-two and a divide-by-five counter in a single package. These counters can be connected to create a divide-by-ten (decade) counter or used independently. It's commonly used in frequency dividers, digital clocks, and other counting applications.

Applications

• Frequency Dividers
• Digital Clocks
• Timers
• Counters
• Digital Displays
• Control Systems

Features

• Divide-by-Two Counter: Provides a single-stage flip-flop for dividing the input frequency by two.
• Divide-by-Five Counter: Provides a four-stage counter for dividing the input frequency by five.
• BCD Output: Provides a Binary Coded Decimal output for easy interfacing with displays.
• Reset Inputs: Provides asynchronous reset inputs to clear the counter.
• Low Power Consumption: LS (Low-power Schottky) TTL technology for low power operation.
• High Speed: Offers moderate switching speeds suitable for various applications.

Benefits

• Versatile Counting: Can be configured as a divide-by-two, divide-by-five, or divide-by-ten counter.
• Easy Interface: BCD output simplifies interfacing with digital displays and other digital systems.
• Simplified Design: Integrated functionality reduces external component count.
• Reduced Power Consumption: Low-power Schottky TTL technology minimizes power dissipation.

Additional Details

The HD74LS90P operates from a 5V power supply. The reset inputs allow for asynchronous clearing of the counter. The BCD output provides a convenient way to display the count value. The LS TTL technology ensures compatibility with other TTL logic devices. The counter can be cascaded to create counters with larger division ratios. The maximum clock frequency is specified in the datasheet. The operating temperature range typically spans from 0°C to +70°C. This counter is commonly used in applications requiring frequency division or counting operations, and is valued for its ease of use and availability.