Recently, Somebody Somewhere wrote these words
> Does anyone of you have a clue (i.e. timing, supply voltage limits,
> complete pinout) about the following chips:
>
> MC 660 L 4-NAND
> MC 671 L tripple 3-NAND
> MC 672 L quad 2-NAND
> MC 680 L hex INVERTER
>
> These are in a piece of control electronics dating back to 1972-76.
> They seem to be straight-forward logic chips running from a 15V supply
> (CMOS? hardly I believe...). I am looking for possible drop-in
> replacements, otherwise I would have to re-do the whole thing with its
> 30+ chips on three PCBs in a more modern technology...
>
> I don't even know where to start to look for the malfunction...
The way to tackle that stuff is with Analogue Signature Analysis. It is
called DTL in my (ancient) reference book, +15V supply, with 1.5V/13V
replacing the familiar 0.8/2.0V. In other words, the output is undefined
for most of the range - sounds like Irish logic :-)). And the
propagation times vary from 60nS (Fast) to 110nS (Slow)
Anyhow, Here's a few pinouts. My info doesn't agree with yours, but who
cares ;-)?
MC 660:(Dual 4 input expander, a.k.a nand gate)
1. Out 1 14. VCC
2. A1 13. D2
3. B1 12. C2
4. EXT 1 11. EXT2
5. C1 10. B2
6. D1 9. A2
7. GND 8. Out 2
MC 671: (Triple 3 Input Nand Gate).
1. A3 14. Vcc
2. B3 13. C3
3. A1 12. O/P 3
4. B1 11. C2
5. C1 10. B2
6. O/P 1 9. A2
7. GND 8. O/P 2
MC672: (Master/Slave R/S Flip Flop)
I suspect this is wrong. The book Calls it a dual 4 input nand gate, and
points at a drawing for a r/s flip flop.
1. NC 14. VCC
2. CLK 13. (No Data shown - nc?)
3. S1 12. R2
4. R1 11. S2
5. RD 10. SD
6. Q(1?) 9. Q(2?)
7. GND 8. NC
FWIW, I looked at other devices there. They seemed to proliferate dual 4
input nand gates. The other common layout (look at the MC 660 above) is
to move output 1 to pin 6 and shove the rest back down.
MC680:
For this I am shown a 5 input nand gate, with separate enable/inhibit
lines. These are labelled A-F with the output as G. Then there is a
table. Looking at the table, I gather the thing is 3 x 3 input nand gate
Gate 1: Inputs 3, 5, 6, Output 2
Gate 2: Inputs 7, 8, 9, Output 10
Gate 3: Inputs 1, 13, 14, Output 12
This drawing is in a wildly different place, and was found as an entry
in a Generic part number index (You look up '07' and it points you at
OP-07, that sort of thing. This pointed me at SP680. MC680 isn't listed.
Power lines are 4,& 11 (but you had that figured, didn't you?)
Now stop looking for this stuff and start looking for my UCN 5830 :-).
--
With best Regards,
Declan Moriarty.
--
Author: Declan Moriarty
INET: [EMAIL PROTECTED]
Fat City Hosting, San Diego, California -- http://www.fatcity.com
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