mc817p & oboslete motorola parts

nick bernard

i've googled, yahoo'd, kartoo'd, altavista'd, and findchips'd "mc817p" and no one seems to know what it is.
does anyone have any general knowledge of this motorola series such as operating voltages, pin outs, topology, etc

thanks
nick

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engineer, fireman, bowler, father, WoW addict [noparse];)[/noparse]

Steve Rennells

I think it's and AD converter, not at all sure about that tho.

I found this link, they appear to have some available. Maybe you can contact them and they can give you the specs or datasheet.

www.sphere.bc.ca/test/tek-parts/tekparts4.html

Paul Baker

All I can find are obsolete part suppliers that list the device, no datasheet databases searched show any results. The only thing I can think of is visiting a university library with a strong engineering college and hope they have an old Motorola databook.

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pjv

Hi Nick;

Here's a shot for you....it goes back a LOOOOONG ways. When I graduated from university (around the time the wheel was invented), the very first brand-new commercially available logic "chips" were of the RTL (Resistor-Transistor_Logic) series. The first ones I saw in 1966 were Fairchild 914's (dual two input NAND gates), and looked lke tiny water towers on 8 (or 10?) legs. Then soon came the Motolola MC800 series in what has now become the familiar DIP package, and I used thousands of those. Although off hand I don't recall which element was the MC817 (inverter maybe?), when I get back from vacation next week I can look for some old documentation I have. I might even be able to find some chips.

The operating voltage was 3.6 Volts, and there were a complete selection of gates, flip/flops, counters, decoders, encoders, buffers, inverters, parity generators, etc., etc. The chip inputs were "just" resistors feeding NPN transistor bases, and the collectors were interconnected to form the chip-specific logic function.

Then Diode-Transistor_Logic (DTL), Transistor-Transistor_logic (TTL) and CMOS lolgic came out, and the RTL series was doomed. It had a low (0.6 volt?) logic threshold and required too much opertating power, and was quite slow. But we sure did build some phenomenal stuff with these first IC's.

To be continued........

Cheers from Maui, Hawaii

Peter (pjv)

Steve Rennells

I found this on datasheetarchive.

Part Number = MC817P
Description = 2-Input NOR-Function Logic Gate
Manufacturer = Motorola
Circuits Per Package = 4
t(PLH) Maximum (S) = 27n
P(D) Max.(W) Power Dissipation = 20m
Vsup Nom.(V) Supply Voltage = 3.6
Status = Discontinued
Package = DIP
Pins = 14
Military = N
Technology = RTL
http://www.datasheetarchive.com/semiconductors/specsheet.php?specsheet=1344378[noparse][[/noparse]url]

Paul Baker

hmmm, if it is RTL its best not to use it at all. They had asymmetric logic level transistions and had·horrible power requirements. TTL pushed RTL to the fray and CMOS killed it completely.

Dang Steve, I checked that database and it came back empty, you're the man.

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nick bernard

wow thanks guys.
its on an old circuit manufactured in the late 70's early 80's that i was working on.
rox on

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engineer, fireman, bowler, father, WoW addict [noparse];)[/noparse]

SPENCE

Ellows,

my recolection is that it is dtl logic with 5.o vdc vcc.

Somebody got a don lancaster ttl cookbook. Think it might just be mentioned in there.

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73
spence
k4kep

pjv

Hi Spence;

No, there are no diodes in it. It's strictly resistors and transistors. I remember that well.....it's what I cut my "electronic" teeth on!

Cheers,

Peter (pjv)