Tristate Buffer Output if Input is High-Z?

steve gkicomputers at
Tue Sep 27 11:14:05 CDT 2005

--- Jeff Walther <trag at> wrote:

> If a tristate buffer is enabled by its control line,
> but the input to 
> the buffer is at high-Z is there a typical output?

High, but with less noise immunity then if you tied
the input high. The immunity could vary with the TTL
family, but leaving unused inputs floating was
standard practice with "standard" TTL, for instance. 

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