Waht is an MC1806 ?
maurice.smulders at gmail.com
Sun Oct 30 17:44:30 CST 2005
On 10/30/05, Tony Duell <ard at p850ug1.demon.co.uk> wrote:
> The Subject: line says it all really, but perhaps I should give a little
> more explanation.
> I am working on an HP59405, which is the HPIB interface for the HP9830
> 'calculator'. On the PCB are 2 chips which cross to something called an
> MC1806. This is not in any of my Motorola databooks.
> What I have determined (I think) so far :
> 1) 14 pin DIL package, power on 14, ground on 7 as usual.
> 2) Seems to be a quad 2-input device, pinout as the 7400 -- that is,
> inputs on 1 and 2, output on 3, etc.
> 3) Seems to be DTL in that the output directly drives the base of an NPN
> transsistor, the emitter of which is grounded.
> 4) The most logical (!) function would be a quad 2 input NOR gate. Maybe
> an AND gate?
> Does anyone have a databook that lists it?
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