14 Dec
2010
14 Dec
'10
11:28 a.m.
On 14 Dec 2010 at 11:11, Brent Hilpert wrote:
Fairchild claimed to have developed the DIP, most of
their early
TTL/DTL stuff had power on the corner pins (there are exceptions, and
some of their other series such as CTL used other pins). It may be
that TI adopted the Fairchild pinouts when TI moved to DIPs.
(The weird thing about the 7490 is power is on neither the corner pins
(7,14) nor the center pins (4,11).
Motorola used power pins as 4 and 10 on their 14-pin DIPs for the
MTTL I and II series.MTTL III changed that to 7 and 14 (corners).
MRTL in plastic DIL appeared to used 4 and 11.
--Chuck