BUY SN74LS624 https://www.utsource.net/itm/p/9452608.html

Description: The SN74LS624 is a 14-pin DIP (dual in-line package) integrated circuit (IC) from Texas Instruments. It is a high-speed, low-power Schottky TTL (transistor-transistor logic) device. Features: High-speed operation: tPD = 10 ns (typical) Low power consumption: ICC = 4 mA (max) Low input current: IIL = 1 μA (max) High noise immunity: VNIH = VNIL = 28% VCC (min) Outputs source/sink 24 mA Outputs can be wired ORed Applications: The SN74LS624 is used in a variety of applications, including: Digital logic circuits Data processing systems Computer systems High-speed logic circuits Interface circuits Memory systems (For reference only)