20 Aug
2015
20 Aug
'15
10:35 a.m.
On Thu, 8/20/15, Mouse <mouse at Rodents-Montreal.ORG> wrote:
Maybe _rated_ current, but, even there, I don't
think so (my TTL
doc hasn't been unpacked yet, or I'd go check, but I'm fairly sure
they are generally specced to sink more current to GND
than source from Vcc).
It so happens I have a TTL handbook to hand at the moment. From
the 1985 TI TTL data book:
Ioh Iol
7400 -0.4 16
74H00 -0.5 20
74LS00 -0.4 8
74S00 -1 20
all in mA. So as rated, TTL devices can sink a solid order of
magnitude more current than they can source.
BLS