This part is a kind of semiconductor called 74121.

Function of this product has One-Shot with Clear and Complementary Outputs.

Manufacturers : Fairchild Semiconductor

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Some of the text within the PDF file :

DM74121 One-Shot with Clear and Complementary Outputs June 1989 Revised November 1999 DM74121 One-Shot with Clear and Complementary Outputs General Description The DM74121 is a monostable multivibrator featuring both positive and negative edge triggering with complementary outputs. An internal 2kΩ timing resistor is provided for design convenience minimizing component count and layout problems. this device can be used with a single external capacitor. Inputs (A) are active-LOW trigger transition inputs and input (B) is and active-HIGH transition Schmitttrigger input that allows jitter-free triggering from inputs with transition rates as slow as 1 volt/second. A high immunity to VCC noise of typically 1.5V is also provided by internal circuitry at the input stage. To obtain optimum and [ ... ]

74121 PDF Datasheet Download