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From: Spehro Pefhany
Subject: Re: TTL/LS registers driving LEDs
X-Newsreader: Forte Agent 1.92/32.572
Date: Sat, 14 Dec 2002 22:36:18 GMT
NNTP-Posting-Date: Sat, 14 Dec 2002 17:36:18 EST
On Sat, 14 Dec 2002 22:21:21 GMT, the renowned Jem Berkes
>I'm working on a little digital device (TTL based) and am going to need
>some 8-bit registers to drive LED displays. I might be building a lot of
>registers into this and wiring is difficult (no automation) so I've been
>trying to figure out whether it's OK to drive a small 7-segment LED display
>directly from the outputs of, for example, the 74LS374 instead of adding
>more buffers. Datasheet: http://www.fairchildsemi.com/ds/DM/DM74LS374.pdf
>It sounds like that register is built for driving bus lines but I don't
>have enough experience to judge whether it's OK for driving small LEDs.
Just stay within the 24mA maximum current per output.
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