> On Feb 1, 2025, at 5:57 PM, Chuck Guzis via cctalk <cctalk@classiccmp.org> > wrote: > > On 2/1/25 13:31, Frank Leonhardt via cctalk wrote: > >> I started with minilogs which were +/- 10V logic. >> >> Anyone remember those? > > I remember HTL (15V) being basically a high-voltage version of DTL. > > --Chuck Similarly, early CMOS logic IC, both the original Philips 4000 series and the 74HC series, support a surprisingly wide range of supply voltages. 3-15 volts for the 4000 series (according to my Radio Shack reference that is), 2 to 6 volts for 74HC. The speed drops off dramatically with lower voltages, though, as I found out when using a 74HC bus driver in a 3.3 volt logic design. paul
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