30 Oct
2005
30 Oct
'05
2:41 p.m.
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?
-tony
30 Oct
30 Oct
3:44 p.m.
Tony,
http://www.datasheetarchive.com/datasheet/pdf/13246.html
Kind regards,
Maurice
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?
-tony
4:49 p.m.
Tony Duell wrote:
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?
The 1969 Motorola Semiconductor Data Book lists the MC1806 as
DTL quad 2 input AND gate (no inversion), pinout as you inferred (outputs 3,6,8,11).
The 1800/1900 numbers seem to be additions/extensions to the standard
800/900-series DTL.
(So MC1806 and MC1906 are the same function but different temperature ranges.)
(Part number MC806 was already used in the RTL series.)
(Also listed in the 1973 Moto Ref Vol 1)
5:09 p.m.
The 1969 Motorola Semiconductor Data Book lists the
MC1806 as
DTL quad 2 input AND gate (no inversion), pinout as you inferred (outputs 3,6,8,11).
Argh, I have the 1968 databook (seriously!).
I am suprised it's an AND gate, but it could make sense. Basically, there
has to be a way to force the output low (to turn off the transistor
connected there, which drives an HPIB data line). That means it has to be
an AND or a NOR gate. Turns out I was wrong guessing the data had to be
inverted going through this gate.
Thanks for the info, I'll figure out the rest of the board...
-tony
6953
days inactive
6953
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3 comments
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participants (3)
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ard＠p850ug1.demon.co.uk -
hilpert＠cs.ubc.ca -
maurice.smulders＠gmail.com