BUY 74HC020 https://www.utsource.net/itm/p/1284245.html
Quad 2-input NOR gate
Description: Quad 2-Input NAND Gate Features: High-speed operation Low power consumption Inputs accept voltages up to 5.5 V Outputs source/sink 24 mA CMOS logic family ESD protection Applications: Signal processing Data transmission Logic interfacing Memory decoding Address decoding Clock generation Timing and sequencing (For reference only)