The HD74LS290P is a decade counter/frequency divider manufactured by Hitachi. This device is part of the Low-power Schottky TTL (LS-TTL) family, offering a balance of speed and power consumption. It contains four master-slave flip-flops and additional gating to provide a divide-by-two and a divide-by-five counter in a single package.

Applications

• Frequency dividers
• Digital clocks and timers
• Event counters
• Time base generators
• Digital instrumentation

Features

• Divide-by-two and divide-by-five counters in one package
• Reset-to-zero inputs
• Set-to-nine input
• LS-TTL technology
• Low power consumption

Benefits

• Provides versatile counting and frequency division options
• Simplifies the design of counting circuits
• Reduces component count
• Offers good performance with moderate power consumption
• Allows for easy cascading

Additional Details

The HD74LS290P operates from a single 5V power supply and is typically available in a 14-pin DIP (Dual In-line Package). The device has two independent counters: a single flip-flop that provides a divide-by-two function (output QA) and a three-stage counter that provides a divide-by-five function (outputs QB, QC, and QD). The counters can be used independently or cascaded to create a decade (divide-by-ten) counter. The device has two reset-to-zero inputs (R0(1) and R0(2)). Asserting both of these inputs high resets all the counters to zero. There is also a set-to-nine input (R9(1) and R9(2)). Asserting both of these inputs high sets the BCD output to 1001. The QA output is toggled by the clock input A. The QB, QC, and QD outputs are toggled by the clock input B. The LS-TTL technology provides a good balance between speed and power consumption. It is crucial to adhere to the recommended operating conditions and timing specifications outlined in the datasheet to ensure proper and reliable operation.