event detection IC
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The 74121 is a monostable multivibrator in a DIP-8 package, used to generate precise single output pulses in response to a triggering event. With adjustable pulse width controlled by external components, this TTL-compatible IC is ideal for pulse generation, timing circuits, and PWM applications.

The SN74HC393CN is a dual 4-bit binary counter IC operating at 5-7V with a 20mA output. It supports up/down counting, making it ideal for frequency division, event counting, and digital timers.
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