4 layers241.8 × 174.8 mm

Boards in 3 GitHub repositories, designed in KiCad, that use the 74F257APC by onsemi (0℃~+70℃ 15mA 24mA 3mA 4.2ns@5V,50pF、4.5ns@5V,50pF 4.5V~5.5V 74F Output enable high-impedance、Tri-state output Single Supply PDIP-16 Signal Switches, Multiplexers, Decoders ROHS). See how each wires it, with its parts, size, README and files; the 74F257APC’s symbol, footprint and pinout are on its own page.


raymondh2/CompaqPortableIII
Current PCB Memory Expansion board layout is untested. The backplane for the expansion cards is tested and working.
