Found Integrated Circuits

A small compendium of old silicon chips

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SN74LS221N-(2)

Published 2014/03/15 at 600 × 300 in Texas Instruments SN74LS221N Dual Monostable Multivibrators with Schmitt-Trigger Inputs.
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SN74LS221N (2), manufactured 1989 week 35

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