PALCE20V8 Datasheet, PDF (13/16 Pages) Advanced Micro Devices – EE CMOS 24-Pin Universal Programmable Array Logic

KEY TO SWITCHING WAVEFORMS
WAVEFORM
INPUTS
Must be
Steady
May
Change
from H to L
May
Change
from L to H
Don’t Care,
Any Change
Permitted
Does Not
Apply
OUTPUTS
Will be
Steady
Will be
Changing
from H to L
Will be
Changing
from L to H
Changing,
State
Unknown
Center
Line is High-
Impedance
“Off” State
KS000010-PAL
AMD
SWITCHING TEST CIRCUIT
5V
S1
R1
Output
CL
R2
Specification
tPD, tCO
tPZX, tEA
tPXZ, tER
S1
Closed
Z → H: Open
Z → L: Closed
H → Z: Open
L → Z: Closed
Switching Test Circuit
16491D-12
CL
50 pF
Commercial
R1
R2
200 Ω
390 Ω
Measured
Output Value
1.5 V
1.5 V
5 pF
H-5:
200 Ω
H → Z: VOH – 0.5 V
L → Z: VOL + 0.5 V
PALCE20V8 Family
2-177