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setup and hold time
setup and hold time
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Old 23rd February 2002, 02:02 AM   #1
R. McAnally is offline R. McAnally  United States
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Join Date: Jan 2002
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Default setup and hold time

What is the significance of a negative setup and hold time for a 7474 D-type flip-flop? I understand the meaning, but what importance does it hold (pun intended)?
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Old 23rd February 2002, 07:20 AM   #2
Chucko is offline Chucko
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Join Date: Jan 2002
Location: Silicon Valley, CA, USA
A negative setup time means that the input doesn't have to be stable until after the triggering edge of the clock. Likewise, a negative hold time means the input can change before the clock edge and still be considered valid. It gives you some extra timing leeway.

I'd be surprised if both were negative for the same input and clock edge though!
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