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The DM8131N is a 16-pin DIP (dual in-line package) integrated circuit (IC) manufactured by National Semiconductor. It is a dual 4-bit binary up/down counter with an asynchronous reset. Features: * Asynchronous reset * 4-bit binary up/down counter * High-speed operation * Low power consumption Applications: * Frequency division * Pulse counting * Timing * Frequency measurement * Digital clocks * Digital tachometers (For reference only)