....still no hint from CMC apart from the statement, that these
have been made for what is now BAE in Rochester, but since
the unit has been retired a decade ago, I doubt that there
will be any information...
Franc Zabkar wrote:
> FWIW, Sprague was manufacturing TND series diode arrays at around that
> time:
> http://www.datasheetarchive.com/pdf/3439831.pdf
>
> I have a FSA2719M DIP-16 diode array made by Fairchild in 1981:
> http://www.datasheetarchive.com/pdf/1421594.pdf
Thanks for these interesting links. I am now quite sure (by measurements
and drawing a little schematic), that the 339-446 is some RCD
network. It is used to connect the open collector output of a
buffer to the pulled up basis of a driver transistor for the
core memories inhibit lines. Unfortunately it is not a simple
diode array because measurements show the diode in the wrong
direction. Maybe it contains Zehner diodes with a capacitor
in parallel. The pinout is as follows:
1,2,15 and 16: Not connected.
3,4: Connected and input1
14,13: Connected and output1
5,6: Connected and input2
11,12: Connected and output2
7,8: Connected and input3
9,10: Connected and output3
So it might well be, that between 3 and 14 there is the Zehner
diode and between 4 and 13 the capacitor and so on...
The second remaining unknown is the 214/020. Here I still have no
guess.
> I also have some DIP RC arrays from around that time.
> BTW, none of my parts have the "blob" at pin 1.
Maybe the "blob" is not by the manufacturer but has been applied
later by some sort of incoming inspection? At least they have been
applied before the PCBs have been covered by the protective coating
which makes it fun doing measurements on the PCBs...
Thanks again,
Erik.
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