BUY HCF4001 https://www.utsource.net/itm/p/30715.html
NOR GATE
The HCF4001 is a quad 2-input NAND Schmitt trigger logic gate manufactured by STMicroelectronics. It is housed in a SO-14 package and is designed for use in high-speed logic applications. The HCF4001 has four independent 2-input NAND gates with Schmitt-trigger inputs. Each gate has a common input and two independent inputs. The Schmitt-trigger action provides improved noise immunity and high-speed switching. The HCF4001 is suitable for applications such as clock and timing circuits, address decoding, data routing, and logic level conversion. It is also suitable for use in analog switches, multiplexers, and signal gating.
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