2 Feb
2025
2 Feb
'25
6:32 p.m.
On Feb 1, 2025, at 5:57 PM, Chuck Guzis via cctalk
<cctalk(a)classiccmp.org> wrote:
On 2/1/25 13:31, Frank Leonhardt via cctalk wrote:
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
I started with minilogs which were +/- 10V
logic.
Anyone remember those?
I remember HTL (15V) being basically a high-voltage version of DTL.
--Chuck