BUY MC14008BDR2G https://www.utsource.net/itm/p/4659715.html
4-Bit Full Adder
Description: The MC14008BDR2G is a quad 2-input OR gate. Features: - Low power consumption - High noise immunity - Inputs are TTL compatible - Outputs are open-collector - Maximum operating temperature of 125°C Applications: - Logic level conversion - Signal buffering - Pulse generation - Clock synchronization - Timing circuits (For reference only)