piclist 2002\10\15\211652a >
Thread: TTL
face BY : Russell McMahon email (remove spam text)

> Is it safe to leave a TTL input floating. It is my understanding that
> they will pull high.

Will generally work OK floating BUT is bad practice and to be avoided. Will
sometimes catch you out and/or degrade performance if left floating. AFAIR
(a long time ago since I used 'real" TTL) ) they can be hard connected to

Be ware that this is for TRUE TTL - TTL compatible CMOS inputs may follow
quite different rules and should always be explicitly terminated.


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<003301c274ba$27b975c0$2301a8c0@Paradise> 7bit

See also: www.piclist.com/techref/index.htm?key=ttl
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