On Mon, 18 Aug 2008 13:18:36 +0100, Invisible <voi### [at] devnull> wrote:

>Stephen wrote:
>
>> TTL is slower and uses more power.
>> I once built a clock out of TTL, in the mid 70's it used IIRC 50 amps at 5 Volts
>> Vcc. A couple of years later a CMOS clock ran from a PP3 battery
>
>50 amps? Shouldn't that tend to cause wires to melt and so forth?

That was the total current supplied from the PS but there were lots of cards
taking significantly less current. IIRC TTL uses about 50 m.a. per chip. And the
wires won't melt if they are rated for it.

>Hey, isn't CMOS that stuff that breaks if you get static on it?

Yes, at one time I worked for Motorola and had unlimited supply of the stuff :)
-- 

Regards
     Stephen

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