On 3/17/25 03:07, Christian Corti via cctalk wrote:
On Thu, 13 Mar 2025, Paul Koning wrote:
it. Yes, ECL is around 3 volts also but negative
supply. And of course
ECL uses -5,5V supply. Logic levels ca. -0.75V and -1.5V
Motorola MECL 10 K : supply -5.2 V and logic levels -1.6V
and -0.8V
MECL 100K supply -4.5 V and logic is the same.
IBM's version that they called MST4 used power supplies of
+1.25 V and -3.0 V and logic levels were -400mV and +400
mV. The advantage of this was they could terminate lines at
ground potential, which made hooking a scope to the end of a
transmission line super easy.
Jon
