Hi,
Consider the propagation time from H (high) to L (low): T PHL. Consider the propagation time from L to H: T PLH. Why are they generally different (in value)? Note that I'm not here speaking about the propagation delay, T PD defined as max(T PHL, T PLH).
Thanks.
Did you read anything about how the circuits work? Look for asymmetries in the device properties and circuit topology.
Hint: the physics of PMOS and NMOS devices are not as similar as they might seem.
Cheers
Phil Hobbs
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Thanks!
Generally, because bipolar transistors aren't symmetrical, top to bottom.
These days, with CMOS, that difference is being eroded.
Hope This Helps! Rich
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