Richard Atkinson wrote:
> > http://staff.washington.edu/rrcc/uwweb/1902A/1902a-1.jpg
>
> Can anyone with a 1902A tell me what IC part number IC252 is? Some form of
> hex open-collector invertor most likely, but exact details (type of 74
> series logic, schmitt trigger or not etc) would be useful.
Hi,
Yes, it seems to be an 74LS05, witch is a normal (not ST) TTL inverter, like
this:
7405
Hex open-collector inverters.
+---+ +---+ +---+---+ _
1A |1 +--+ 14| VCC | A I/Y | /Y = A
/1Y |2 13| 6A +===+===+
2A |3 12| /6Y | 0 I Z |
/2Y |4 7405 11| 5A | 1 I 0 |
3A |5 10| /5Y +---+---+
/3Y |6 9| 4A
GND |7 8| /4Y
+----------+
joco
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