Fusion Family of Mixed Signal FPGAs
Revision 4 2-171
Table 2-93 • Summary of I/O Timing Characteristics – Software Default Settings
Commercial Temperature Range Conditions: T
J
= 70°C, Worst-Case VCC
= 1.425 V,
Worst-Case VCCI = I/O Standard Dependent
Applicable to Advanced I/Os
I/O Standard
Drive Strength (mA)
Slew Rate
Capacitive Load (pF)
External Resistor (Ohm)
t
DOUT
t
DP
t
DIN
t
PY
t
EOUT
t
ZL
t
ZH
t
LZ
t
HZ
t
ZLS
t
ZHS
Units
3.3 V LVTTL/
3.3 V LVCMOS
12 mA High 35 pF – 0.49 2.64 0.03 0.90 0.32 2.69 2.11 2.40 2.68 4.36 3.78 ns
2.5 V LVCMOS 12 mA High 35 pF – 0.49 2.66 0.03 0.98 0.32 2.71 2.56 2.47 2.57 4.38 4.23 ns
1.8 V LVCMOS 12 mA High 35 pF – 0.49 2.64 0.03 0.91 0.32 2.69 2.27 2.76 3.05 4.36 3.94 ns
1.5 V LVCMOS 12 mA High 35 pF – 0.49 3.05 0.03 1.07 0.32 3.10 2.67 2.95 3.14 4.77 4.34 ns
3.3 V PCI Per PCI
spec
High 10 pF 25
2
0.49 2.00 0.03 0.65 0.32 2.04 1.46 2.40 2.68 3.71 3.13 ns
3.3 V PCI-X Per PCI-X
spec
High 10 pF 25
2
0.49 2.00 0.03 0.62 0.32 2.04 1.46 2.40 2.68 3.71 3.13 ns
LVDS 24 mA High – – 0.49 1.37 0.03 1.20 N/A N/A N/A N/A N/A N/A N/A ns
LVPECL 24 mA High – – 0.49 1.34 0.03 1.05 N/A N/A N/A N/A N/A N/A N/A ns
Notes:
1. For specific junction temperature and voltage-supply levels, refer to Table 3-6 on page 3-7 for derating values.
2. Resistance is used to measure I/O propagation delays as defined in PCI specifications. See Figure 2-123 on page 2-200
for connectivity. This resistor is not required during normal operation.
Table 2-94 • Summary of I/O Timing Characteristics – Software Default Settings
Commercial Temperature Range Conditions: T
J
= 70°C, Worst-Case VCC = 1.425 V,
Worst-Case VCCI = I/O Standard Dependent
Applicable to Standard I/Os
I/O Standard
Drive Strength (mA)
Slew Rate
Capacitive Load (pF)
External Resistor (Ohm)
t
DOUT
t
DP
t
DIN
t
PY
t
EOUT
t
ZL
t
ZH
t
LZ
t
HZ
Units
3.3 V LVTTL/
3.3 V LVCMOS
8 mA High 35 pF – 0.49 3.29 0.03 0.75 0.32 3.36 2.80 1.79 2.01 ns
2.5 V LVCMOS 8 mA High 35pF – 0.49 3.56 0.03 0.96 0.32 3.40 3.56 1.78 1.91 ns
1.8 V LVCMOS 4 mA High 35pF – 0.49 4.74 0.03 0.90 0.32 4.02 4.74 1.80 1.85 ns
1.5 V LVCMOS 2 mA High 35pF – 0.49 5.71 0.03 1.06 0.32 4.71 5.71 1.83 1.83 ns
Note: For specific junction temperature and voltage-supply levels, refer to Table 3-6 on page 3-7 for derating values.