IGLOO Low Power Flash FPGAs
Revision 23
2-33
Table 2-35 Summary of I/O Timing Characteristics—Software Default Settings, Std. Speed Grade,
Commercial-Case Conditions: TJ = 70°C, Worst-Case VCC = 1.14 V, Worst-Case VCCI (per
standard)
Applicable to Standard Plus I/O Banks
I/O
S
tan
dard
Drive
S
tr
eng
th
Equivalent
Sof
tware
Default
Drive
S
tren
g
th
Op
tio
n
1 (mA)
Slew
Rate
Cap
acitiv
eLo
ad
(pF
)
Extern
al
Resisto
r
(
)
t DOU
T(ns)
t DP
(ns)
t DIN
(n
s)
t PY
(ns)
t EOU
T
(ns)
t ZL
(ns)
t ZH
(ns)
t LZ
(ns)
t HZ
(ns)
t ZLS
(n
s)
t ZHS
(ns)
Unit
s
3.3 V
LVTTL /
3.3 V
LVCMOS
12 mA
12
High
5
–
1.55 2.31 0.26 0.97 1.10 2.34 1.86 2.93 3.64 8.12 7.65 ns
3.3 V
LVCMOS
Wide
Range2
100 A
12
High
5
–
1.55 3.20 0.26 1.32 1.10 3.20 2.52 4.01 4.97 8.99 8.31 ns
2.5 V
LVCMOS
12 mA
12
High
5
–
1.55 2.29 0.26 1.19 1.10 2.32 1.94 2.94 3.52 8.10 7.73 ns
1.8 V
LVCMOS
8 mA
8
High
5
–
1.55 2.43 0.26 1.11 1.10 2.47 2.16 2.99 3.39 8.25 7.94 ns
1.5 V
LVCMOS
4 mA
4
High
5
–
1.55 2.68 0.26 1.27 1.10 2.72 2.39 3.07 3.37 8.50 8.18 ns
1.2 V
LVCMOS
2 mA
2
High
5
–
1.55 3.22 0.26 1.59 1.10 3.11 2.78 3.29 3.48 8.90 8.57 ns
1.2 V
LVCMOS
Wide
Range3
100 A
2
High
5
–
1.55 3.22 0.26 1.59 1.10 3.11 2.78 3.29 3.48 8.90 8.57 ns
3.3 V PCI
Per
PCI
spec
–
High
10 252 1.55 2.53 0.26 0.84 1.10 2.57 1.98 2.93 3.64 8.35 7.76 ns
3.3 V
PCI-X
Per
PCI-X
spec
–
High 10
252 1.55 2.53 0.25 0.85 1.10 2.57 1.98 2.93 3.64 8.35 7.76 ns
Notes:
1. The minimum drive strength for any LVCMOS 1.2 V or 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 JESD-8B specification.
3. All LVCMOS 1.2 V software macros support LVCMOS 1.2 V wide range as specified in the JESD8-12 specification
for connectivity. This resistor is not required during normal operation.
5. For specific junction temperature and voltage supply levels, refer to Table 2-6 on page 2-7 for derating values.