General > General Technical Chat
74HCXX voltage
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David Hess:

--- Quote from: DiTBho on August 31, 2023, 02:07:36 pm ---My super fast 245-F :D

F = fast, what else?
--- End quote ---

F = FAST = Fast Advanced Schottky TTL, which is roughly comparable to AS or Advanced Schottky.

FAST had a pretty amazing combination of low supply current, high speed, and high output drive.  I wish more of the TTL library of functions was made available in FAST.
Someone:

--- Quote from: BrianHG on August 31, 2023, 05:59:43 pm ---Why not just look at any data sheet?

Almost all of the data sheets, the good old ones from Motorola, TI, Philips, ect, all specify exactly what happens with their 74HCxxx's and 74HCTxxx's input and output thresholds, current drive and propagation delays with Vcc at 5.0v, 3.3v, 2.5v at a bare minimum.
--- End quote ---
Modern data sheets that have the characteristics specified at -10% nominal VCC can be a better way.
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