PAL16L8B Datasheet, PDF (17/33 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
5
pF
8
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
(Note 3) Max Unit
16L8, 16R6,
3
16R4
10
ns
tS
Setup Time from Input or Feedback to Clock
10
ns
tH
Hold Time
0
ns
tCO
Clock to Output
3
7
ns
tWL
Clock Width
LOW
8
ns
tWH
HIGH
16R8, 16R6,
8
ns
Maximum
fMAX
Frequency
(Note 4)
External Feedback
Internal Feedback
(fCNT)
1/(tS + tCO)
1/(tS + tCF)
(Note 5)
16R4
58.8
60
MHz
MHz
No Feedback
1/(tWH + tWL)
62.5
MHz
tPZX
OE to Output Enable
2
10
ns
tPXZ
OE to Output Disable
2
10
ns
tEA
Input to Output Enable Using Product Term Control
16L8, 16R6,
3
10
ns
tER
Input to Output Disable Using Product Term Control
16R4
3
10
ns
Notes:
2. See Switching Test Circuit for test conditions.
3. Output delay minimums for tPD, tCO, tPZX, tPXZ, tEA, and tER are defined under best case conditions. Future process improve-
ments may alter these values; therefore, minimum values are recommended for simulation purposes only.
4. These parameters are not 100% tested, but are calculated at initial characterization and at any time the design is modified
where the 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.
PAL16R8D/2 (Com’l)
2-19