BUY HEF4720BD https://www.utsource.net/itm/p/117432.html
256-bit, 1-bit per word random access memories
Description: The HEF4720BD is a dual 4-input NAND gate with Schmitt-trigger inputs. Features: High noise immunity Low power consumption Schmitt-trigger inputs Outputs with totem-pole structure Low input current Low input threshold High noise immunity High speed Low power dissipation High noise immunity Applications: Signal buffering Digital logic gates Flip-flops Counters Data selectors/multiplexers Analog switches Pulse generators Timers Voltage level translators (For reference only)