[time-nuts] HP 1820-0313 4.2V Logic (Flip-flop)
hmurray at megapathdsl.net
Wed May 17 02:18:05 EDT 2017
dgminala at mediacombb.net said:
> The 1820-0313 is a Fairchild 931HC or Motorola MC931G DTL clocked flipflop.
> I think if you toy with a TTL or CMOS JK-flipflop; it should work with no
> issues. The only caveat would be the 4.2V Vcc. The DTL logic was spec'ed
> to run at 5V, same as TTL, but don't know how TTL logic would work at 4.2V.
CMOS runs fine at lower voltages - just slower. Many data sheets for 5V
parts include timings for 3.3V and 1.65V. I'd try HC.
As a rule of thumb, speed (MHz) is roughly linear going through 0 at 0V and
prop time is roughly linear going through 0 at absolute zero.
These are my opinions. I hate spam.
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