BUY MC74ACT640N https://www.utsource.net/itm/p/636632.html
Octal 3-State Inverting Transceiver; Package: 20 LEAD PDIP; No of Pins: 20; Container: Rail; Qty per Container: 18
The MC74ACT640N is a high-speed CMOS logic device manufactured by Motorola. It is a 20-pin DIP (Dual In-line Package) device. Description: The MC74ACT640N is a high-speed CMOS logic device that contains an 8-bit buffer/line driver with 3-state outputs. It is designed to be used as a memory address driver, clock driver, or bus oriented transmitter/receiver. Features: High-speed operation: tpd = 8.0ns (typical) Low power dissipation: ICC = 4.0mA (max) High noise immunity: VNIH = VNIL = 28% VCC (min) Outputs source/sink 24mA Outputs are 3-state Applications: Memory address drivers Clock drivers Bus oriented transmitter/receiver (For reference only)