74??00

Does anybody have a table of the various designators and the specs for each?

So:
        none
        S
        LS
        HC
        HCT
        LV
        LVT
        etc...

Thanks!

Kurt

> On Thu, 10 May 2001 08:54:17 -0700, you wrote:
>
> >Where did you get the 74sc374's that buffer the data. I have been looking
> >for them for quite a while and have had no luck finding them.
>
> The 74SCxx series was the precursor to the 74HC and HCT series - if
> memory serves, it was one of TI's lines, and the SC designation came from
> combining the 74Cxx (meaning pinout-compatible CMOS versions of standard
> 7400 TTL packages) and 74Sxx (speedier versions) designators. In other
> words, "Speedy CMOS". :) (At the time, IIRC, the most common CMOS logic
> family was the 4000 series, which was significantly slower than the 7400
> TTL chips.)
>
> Depending on the circuit, you should be able to substitute either a
> 74HC-series or a 74HCT-series chip for any of the old 74SC parts. (The
> difference is that 74HC is compatible, signal and voltage-wise, with 4000
> and 74C-series CMOS; 74HCT is compatible with regular 5-volt TTL logic.) I
> forget whether the SC's were CMOS-level or TTL-level, so check your
> schematic to see what other chips are connecting to it. :)
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Received on Sat May 12 00:35:05 2001