AMD
CAPACITANCE (Note 1)
Parameter
Symbol
Parameter Description
Test Conditions
VIN = 2.0 V
Typ
5
Unit
pF
CIN
Input Capacitance
Output Capacitance
VCC = 5.0 V
TA = 25°C
f = 1 MHz
COUT
VOUT = 2.0 V
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
Min
Parameter Description
(Note 3)
Max
7.5
7
Unit
16L8, 16R6,
16R4
3
3
Input or Feedback to
Combinatorial Output
tPD
ns
1 Output Switching
tS
tH
Setup Time from Input or Feedback to Clock
Hold Time
7
0
1
ns
ns
tCO
tSKEW
tWL
tWH
Clock to Output
6.5
1
ns
Skew Between Registered Outputs (Note 4)
16R8, 16R6,
16R4
ns
LOW
5
5
ns
Clock Width
HIGH
ns
External Feedback
1/(tS + tCO
)
74
100
MHz
MHz
Maximum
Frequency
(Note 5)
fMAX
Internal Feedback
1/(tS + tCF
(Note 6)
)
(fCNT
)
No Feedback
1/(tWH + tWL
)
100
1
MHz
ns
tPZX
tPXZ
tEA
OE to Output Enable
OE to Output Disable
8
8
1
ns
Input to Output Enable Using Product Term Control
Input to Output Disable Using Product Term Control
16L8, 16R6,
16R4
3
10
10
ns
tER
3
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. Skew is measured with all outputs switching in the same direction.
5. 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.
6. tCF is a calculated value and is not guaranteed. tCF can be found using the following equation:
tCF = 1/fMAX (internal feedback) – tS.
2-17
PAL16R8-7 (Com’l)
AMD [ AMD ]
