PAL16L8B Datasheet, PDF (23/33 Pages) Advanced Micro Devices – 20-Pin TTL Programmable Array Logic

AMD
CAPACITANCE (Note 1)
Parameter
Symbol
Parameter Description
Test Conditions
Typ
Unit
CIN
COUT
Input Capacitance
Output Capacitance
VIN = 2.0 V
VOUT = 2.0 V
VCC = 5.0 V
TA = 25°C
f = 1 MHz
7
pF
7
Note:
1. These parameters are not 100% tested, but are evaluated at initial characterization and at any time the design is modified
where capacitance may be affected.
SWITCHING CHARACTERISTICS over COMMERCIAL operating ranges (Note 2)
Parameter
Symbol
tPD
Parameter Description
Input or Feedback to Combinatorial Output
Min
Max
16L8, 16R6,
25
16R4
tS
Setup Time from Input or Feedback to Clock
25
tH
Hold Time
0
tCO
Clock to Output
15
tWL
Clock Width
LOW
15
tWH
Maximum
fMAX
Frequency
(Note 4)
HIGH
External Feedback
Internal Feedback
(fCNT)
1/(tS + tCO)
1/(tS + tCF)
(Note 5)
15
16R8, 16R6,
16R4
25
28.5
No Feedback
1/(tWH + tWL)
33
tPZX
OE to Output Enable
20
tPXZ
OE to Output Disable
20
tEA
Input to Output Enable Using Product Term Control
16R8, 16R6,
25
tER
Input to Output Disable Using Product Term Control
16R4
25
Unit
ns
ns
ns
ns
ns
ns
MHz
MHz
MHz
ns
ns
ns
ns
Notes:
2. See Switching Test Circuit for test conditions.
3. Calculated from measured fMAX internal.
4. These parameters are not 100% tested, but are calculated at initial characterization and at any time the design is modified
where frequency may be affected.
5. tCF is a calculated value and is not guaranteed. tCF can be found using the following equation:
tCF = 1/fMAX (internal feedback) – tS.
PAL16R8A (Com’l)
2-25