ProASIC3 Flash Family FPGAs
Revision 13
2-23
Table 2-25 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 (per standard)
Standard Plus I/O Banks
I/O Standard
D
rive
S
tre
ng
th
Equiv
.Sof
tware
Default
Dri
v
eS
tre
ng
th
Opt
ion
1
Slew
Rate
C
ap
a
citive
L
o
a
d
(pF
)
Ex
tern
al
Re
sistor
t DO
UT
(ns)
t DP
(ns)
t DI
N
(ns)
t PY
(ns)
t EOUT
(ns)
t ZL
(ns)
t ZH
(ns)
t LZ
(ns)
t HZ
(ns)
t ZL
S
(ns)
t ZH
S
(n
s)
Un
it
s
3.3 V LVTTL /
3.3 V LVCMOS
12 mA 12 mA High 35
– 0.45 2.36 0.03 0.75 0.32 2.40 1.93 2.08 2.41 4.07 3.60 ns
3.3 V LVCMOS
Wide Range2
100 A 12 mA High 35
– 0.45 3.65 0.03 1.14 0.32 3.65 2.93 3.22 3.72 6.18 5.46 ns
2.5 V LVCMOS 12 mA 12 mA High 35
– 0.45 2.39 0.03 0.97 0.32 2.44 2.35 2.11 2.32 4.11 4.02 ns
1.8 V LVCMOS
8 mA 8 mA High 35
– 0.45 3.03 0.03 0.90 0.32 2.87 3.03 2.19 2.32 4.54 4.70 ns
1.5 V LVCMOS
4 mA 4 mA High 35
– 0.45 3.61 0.03 1.06 0.32 3.35 3.61 2.26 2.34 5.02 5.28 ns
3.3 V PCI
Per
PCI
spec
–
High 10 25 4 0.45 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 25 4 0.45 1.72 0.03 0.62 0.32 1.76 1.27 2.08 2.41 3.42 2.94 ns
Notes:
1. The minimum drive strength for any LVCMOS 3.3 V software configuration when run in wide range is ±100 A. Drive
strength displayed in the software is supported for normal range only. For a detailed I/V curve, refer to the IBIS models.
2. All LVCMOS 3.3 V software macros support LVCMOS 3.3 V wide range as specified in the JESD8-B specification.
3. For specific junction temperature and voltage supply levels, refer to Table 2-6 on page 2-6 for derating values. 4. Resistance is used to measure I/O propagation delays as defined in PCI specifications. See Figure 2-10 on page 2-63 for connectivity. This resistor is not required during normal operation.