28 Jul
2020
28 Jul
'20
11:43 a.m.
Fairchild part numbers trivia following.
On 2020-Jul-28, at 7:35 AM, Jay Jaeger via cctalk wrote:
The 936 is DTL.
Fairchild part numbers were a bit of a mess when looked at over their production period.
The part numbers did not readily distinguish between logic families.
Some units had the RT?L/DT?L/TT?L labeling, but that was not always present (the Fairchild
labeling there actually is mu/micro rather than u).
Some examples of the mish-mash:
901 : RT?L
915 : RT?L
926 : RT?L
936 : DT?L
946 : DT?L
960 : C?L
961 : DT?L
9007 : TT?L
9097 : DT?L
9997 : RT?L
There was often an additional 9 in front of the 3-digit types.
e.g. 9936 is DT?L 936.
Even the 59 suffix for the temp range, mentioned above, was ambiguous.
59 meant 0::+75C for DT?L, TT?L & C?L,
but
59 meant +15::+55C for CT?L.
My DTL chips have markings like:
DT uL93659 (Chip type 936)
F 7016
DT uL909759 (Chip type 9097)
F 7013
(I expect 7016 and 7013 are date codes. Not sure what the "59" is about.)
The 59 is the temperature range. For DT?L, 59 is 0C::+75C.
On 2020-Jul-28, at 8:11 AM, Paul Koning via cctalk wrote:
On Jul 28,
2020, at 10:35 AM, Jay Jaeger via cctalk <cctalk at classiccmp.org> wrote:
DT uL93659 (Chip type 936)
F 7016 ...
Is that DTL or RTL? Fairchild originally came out with RTL chips, which had uL part
numbers like uL914 (dual 2 input NOR) and uL923 (JK flop) in TO cans with 8 leads. The supply voltage would tell you; RTL uses 3.6 or so,
while DTL uses 6 volts.
Per the OP's machine, the early HP21xx machines were based on CT?L, for which the main
supply is +4.5V.
DTL and TTL chips in these machines ran off that 4.5 supply.