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BUY MM74C221N https://www.utsource.net/itm/p/11546020.html
IC MULTIVIBRATOR MONO DUAL 16DIP
Description: Dual Monostable Multivibrator Features: Low Power Consumption High Noise Immunity Low Input Current High Output Current Wide Operating Voltage Range High Speed Operation TTL Compatible Applications: Pulse Generation Timing Pulse Width Modulation Frequency Division Pulse Position Modulation Pulse Stretching Waveform Generation (For reference only)