Dave M wrote:
Poul-Henning Kamp wrote:
--------
In message <1580810140.741428.1494966823...@mail.yahoo.com>, Ulf
Kylenfall via time-nut s writes:
That the 1820-0313 is unobtanium I can understand.Has anyone created
an equvalent based on discretesor is there a suitable SMD "single"
flip-flop like single gatesthat could be suitable?
I did a divider board for the LED clock:
http://phk.freebsd.dk/hacks/HP5065A/20160112_working_clock/index.html
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. .
You might find a 3.3V flipflop and zener the 4.2V Vcc down to 3.3V
and build it all onto a small piece of perfboard.
I've attached a copy of the pertinent pages from my old Motorola
databook (1966 Motorola Semiconductor Handbook) directly to Poul.
Dave M
Oops... I meant to say that I sent a copy of the datasheet to the OP
Dave M
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