This part is a kind of semiconductor called 54122.

Function of this product has Retriggerable Resettable Multivibrator.

Manufacturers : National Semiconductor

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54122 DM74122 Retriggerable Resettable Multivibrator June 1989 54122 DM74122 Retriggerable Resettable Multivibrator General Description The ’122 features positive and negative DC level triggering inputs complementary outputs an optional 10 kX internal timing resistor and an overriding Direct Clear (CD) input When the circuit is in the quasi-stable (delay) state another trigger applied to the inputs (per Truth Table) will cause the delay period to start again without disturbing the outputs This process can be repeated indefinitely and thus the output pulse period (Q HIGH Q LOW) can be made as long as desired Alternatively a delay period can be terminated by a LOW signal applied to CD which also prevents triggering An internal connection from CD to the input gate makes it possible to tri [ ... ]

54122 PDF Datasheet Download