[time-nuts] Fw: HP 1820-0313 4.2V Logic (Flip-flop)
dgminala at mediacombb.net
Tue May 16 19:42:15 EDT 2017
Dave M wrote:
> Poul-Henning Kamp wrote:
>> In message <1580810140.741428.1494966823210 at 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:
> 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
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