R
Table 18: Output Timing Adjustments for IOB (Continued)
Table 18: Output Timing Adjustments for IOB
Add the
Add the
Adjustment
Below
Convert Output Time from
LVCMOS25 with 12mA Drive and
Fast Slew Rate to the Following
Signal Standard (IOSTANDARD)
Adjustment
Below
Convert Output Time from
LVCMOS25 with 12mA Drive and
Fast Slew Rate to the Following
Signal Standard (IOSTANDARD)
-4 Speed
Grade
-4 Speed
Grade
Units
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Units
LVCMOS18
Slow
2 mA
4 mA
6 mA
8 mA
2 mA
4 mA
6 mA
8 mA
2 mA
4 mA
6 mA
2 mA
4 mA
6 mA
2 mA
2 mA
5.24
3.21
2.49
1.90
4.15
2.13
1.14
0.75
4.68
3.97
3.11
3.38
2.70
1.53
6.63
4.44
0.34
0.55
0.46
0.25
–0.20
Single-Ended Standards
LVTTL
Slow
Fast
Slow
Fast
2 mA
4 mA
6 mA
8 mA
12 mA
16 mA
2 mA
4 mA
6 mA
8 mA
12 mA
16 mA
2 mA
4 mA
6 mA
8 mA
12 mA
16 mA
2 mA
4 mA
6 mA
8 mA
12 mA
16 mA
2 mA
4 mA
6 mA
8 mA
12 mA
2 mA
4 mA
6 mA
8 mA
12 mA
5.41
2.41
1.90
0.67
0.70
0.43
5.00
1.96
1.45
0.34
0.30
0.30
5.29
1.89
1.04
0.69
0.42
0.43
4.87
1.52
0.39
0.34
0.30
0.30
4.21
2.26
1.52
1.08
0.68
3.67
1.72
0.46
0.21
0
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Fast
LVCMOS15
LVCMOS12
Slow
Fast
LVCMOS33
Slow
Fast
HSTL_I_18
HSTL_III_18
PCI33_3
SSTL18_I
SSTL2_I
Differential Standards
LVDS_25
–0.55
0.04
ns
ns
ns
ns
ns
ns
ns
ns
ns
BLVDS_25
MINI_LVDS_25
LVPECL_25
–0.56
Input Only
–0.48
0.42
LVCMOS25
Slow
Fast
RSDS_25
DIFF_HSTL_I_18
DIFF_HSTL_III_18
DIFF_SSTL18_I
DIFF_SSTL2_I
0.55
0.40
0.44
Notes:
1. The numbers in this table are tested using the methodology
presented in Table 19 and are based on the operating conditions
set forth in Table 6, Table 9, and Table 11.
2. These adjustments are used to convert output- and
three-state-path times originally specified for the LVCMOS25
standard with 12 mA drive and Fast slew rate to times that
correspond to other signal standards. Do not adjust times that
measure when outputs go into a high-impedance state.
DS635 (v2.0) September 9, 2009
www.xilinx.com
Product Specification
18
XILINX [ XILINX, INC ]
