On Thu, 29 Nov 2007 13:33:39 -0500, "tempus fugit"
wrote:

Hey all;

I want to drive LEDs directly from the outputs of a 74LS373N latch, but I
can't figure out which parameter is the maximum current I can get from it.
I've enclosed the data sheet. On p. 6, there's a then a different 1 on p. 9
IOH High-level output current

and

IOL Low-level output current


then a different 1 on p. 9. Can anyone tell me which parameter I should be
looking at? Or am I looking at teh wron g thing altogether?

Thanks


Bipolar TTL, such as the 74S and 74LS families, have much different
drive capabilities for low and high output states. The low output
current is always higher, so you should connect your LEDs to +5V, so
they will turn on when the latch output is low.

The table on page 6 refers to the 74LS parts, while page 9 refers to
74S parts.


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Peter Bennett, VE7CEI
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