AMD
and the wide range of ways VCC can rise to its steady
state, two conditions are required to insure a valid
power-up reset. These conditions are:
POWER-UP RESET
The PALCE16V8 has been designed with the capability
to reset during system power-up. Following power-up,
all flip-flops will be reset to LOW. The output state will be
HIGH independent of the logic polarity. This feature pro-
vides extra flexibility to the designer and is especially
valuable in simplifying state machine initialization. A
timing diagram and parameter table are shown below.
Due to the synchronous operation of the power-up reset
The VCC rise must be monotonic.
Following reset, the clock input must not be driven
from LOW to HIGH until all applicable input and
feedback setup times are met.
Parameter
Symbol
Parameter Descriptions
Power-Up Reset Time
Input or Feedback Setup Time
Clock Width LOW
Min
Max
Unit
tPR
1000
ns
tS
See Switching Characteristics
tWL
VCC
4 V
Power
tPR
Registered
Output
tS
Clock
tWL
16493D-15
Power-Up Reset Waveform
2-60
PALCE16V8 Family
AMD [ AMD ]
