This part is a kind of semiconductor called 74221.

Function of this product has Dual non-retriggerable monostable multivibrator with reset.

Manufacturers : NXP

Image and pinout :

Some of the text within the PDF file :

INTEGRATED CIRCUITS DATA SHEET For a complete data sheet, please also download: • The IC06 74HC/HCT/HCU/HCMOS Logic Family Specifications • The IC06 74HC/HCT/HCU/HCMOS Logic Package Information • The IC06 74HC/HCT/HCU/HCMOS Logic Package Outlines 74HC/HCT221 Dual non-retriggerable monostable multivibrator with reset Product specification Supersedes data of April 1988 File under Integrated Circuits, IC06 December 1990 Philips Semiconductors Product specification Dual non-retriggerable monostable multivibrator with reset FEATURES • Pulse width variance is typically less than ± 5% • Pin-out identical to “123” • Overriding reset terminates output pulse • nB inputs have hysteresis for improved noise immunity • Output capability: standard (except for nREXT/CEXT) • I [ ... ]

74221 PDF Datasheet Download