BUY HEF4028BT653 https://www.utsource.net/itm/p/9750684.html

Description: The HEF4028BT653 is a CMOS logic chip manufactured by NEXPERI. It is a quad 2-input NOR gate with Schmitt-trigger inputs. Features: - Low power consumption - High noise immunity - High speed operation - Low input current - High fan-out - High input impedance Applications: - Signal conditioning - Clock and timing circuits - Pulse generation - Data transmission - Interface circuits - Digital logic circuits (For reference only)