AMD
CAPACITANCE (Note 1)
Parameter
Symbol
Parameter Description
Test Conditions
Typ
Unit
pF
CIN
Input Capacitance
VIN = 2.0 V
VCC = 5.0 V
TA = 25°C
f = 1 MHz
7
COUT
Output Capacitance
VOUT = 2.0 V
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
Parameter Description
Min
Max
Unit
tPD
Input or Feedback to Combinatorial Output
16L8, 16R6,
16R4
25
ns
tS
tH
Setup Time from Input or Feedback to Clock
Hold Time
25
0
ns
ns
tCO
tWL
tWH
Clock to Output
15
ns
Clock Width
LOW
15
15
ns
HIGH
ns
16R8, 16R6,
16R4
External Feedback
1/(tS + tCO
)
25
MHz
MHz
Maximum
Frequency
(Note 4)
fMAX
Internal Feedback
1/(tS + tCF
(Note 5)
)
28.5
(fCNT
)
No Feedback
1/(tWH + tWL
)
33
MHz
ns
tPZX
tPXZ
tEA
OE to Output Enable
OE to Output Disable
20
20
25
25
ns
Input to Output Enable Using Product Term Control
Input to Output Disable Using Product Term Control
ns
16R8, 16R6,
16R4
tER
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.
2-25
PAL16R8A (Com’l)
AMD [ AMD ]
