On 9/26/2005 at 6:09 PM Jeff Walther 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?
I think I understand what you're asking, but I'm not sure.
If it's straight bipolar TTL, the high-Z input is usually at a "high" level.
But iwith CMOS, you're in terra incognita. Stray charges can linger on lines a lot
longer than on bipolar. Better to add some pullups--it shouldn't take much to clamp
the inputs at a "high" state--100K should be fine. 10K will work fine on
LSTTL.
Cheers,
Chuck