ProASIC3 DC and Switching Characteristics
2- 20
v1.1
Table 2-21 Summary of I/O Timing Characteristics—Software Default Settings
–2 Speed Grade, Commercial-Case Conditions: TJ = 70°C, Worst Case VCC = 1.425 V, Worst Case
VCCI =3.0 V
Standard Plus I/O Banks
I/O Standard
Drive
St
re
ngth
(mA)
Slew
Ra
te
Ca
pac
itiv
e
Load
(p
F)
Ext
er
na
lResist
or
t DO
U
T
(ns)
t DP
(ns)
t DI
N
(ns)
t PY
(ns)
t EO
U
T
(n
s)
t ZL
(ns)
t ZH
(ns)
t LZ
(ns)
t HZ
(ns)
t ZLS
(ns)
t ZH
S
(ns)
Units
3.3 V LVTTL /
3.3 V LVCMOS
12 mA
High 35 pF
–
0.49 2.36 0.03 0.75 0.32 2.40 1.93 2.08 2.41 4.07 3.60 ns
2.5 V LVCMOS
12 mA
High 35 pF
–
0.49 2.39 0.03 0.97 0.322.44 2.352.112.324.114.02 ns
1.8 V LVCMOS
8 mA
High 35 pF
–
0.49 3.03 0.03 0.90 0.322.87 3.032.192.324.544.70 ns
1.5 V LVCMOS
4 mA
High 35 pF
–
0.49 3.61 0.03 1.06 0.323.35 3.612.262.345.025.28 ns
3.3 V PCI
Per PCI spec.
High 10 pF 25 2 0.49 1.72 0.03 0.64 0.32 1.76 1.27 2.08 2.41 3.42 2.94 ns
3.3 V PCI-X
Per PCI-X spec. High 10 pF 25 2 0.49 1.72 0.03 0.64 0.32 1.76 1.27 2.08 2.41 3.42 2.94 ns
Notes:
1. For specific junction temperature and voltage supply levels, refer to Table 2-6 on page 2-6 for derating values.
2. Resistance is used to measure I/O propagation delays as defined in PCI specifications. See Figure 2-10 on page 2-54 for connectivity. This resistor is not required during normal operation.
Table 2-22 Summary of I/O Timing Characteristics—Software Default Settings
–2 Speed Grade, Commercial-Case Conditions: TJ = 70°C, Worst Case VCC = 1.425 V,
Worst Case VCCI = 3.0 V
Standard I/O Banks
I/O Standard
Drive
Str
e
ngt
h
(mA)
Slew
Rat
e
Capacitive
Load
(pF)
Exte
rnal
Re
si
st
or
t DO
UT
(ns)
t DP
(n
s)
t DI
N
(ns)
t PY
(ns)
t EO
UT
(ns)
t ZL
(ns)
t ZH
(n
s)
t LZ
(ns)
t HZ
(n
s)
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
35 pF
–
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
35 pF
–
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
35 pF
–
0.49
5.71
0.03
1.06
0.32
4.71
5.71
1.83
ns
Notes:
1. For specific junction temperature and voltage supply levels, refer to Table 2-6 on page 2-6 for derating values.
2. Resistance is used to measure I/O propagation delays as defined in PCI specifications. See Figure 2-10 on page 2-54 for connectivity. This resistor is not required during normal operation.