XC3S50A-4FTG256C Datasheet, PDF (33/132 Pages) Xilinx, Inc – Architectural and Configuration Overview

DC and Switching Characteristics
Output Timing Adjustments
Table 26: Output Timing Adjustments for IOB
Convert Output Time from
LVCMOS25 with 12mA Drive and
Fast Slew Rate to the Following
Signal Standard (IOSTANDARD)
Add the
Adjustment
Below
Speed Grade
-5
-4
Single-Ended Standards
LVTTL
Slow 2 mA 5.58 5.58
4 mA 3.16 3.16
6 mA 3.17 3.17
8 mA 2.09 2.09
12 mA 1.62 1.62
16 mA 1.24 1.24
24 mA 2.74⁽³⁾ 2.74⁽³⁾
Fast 2 mA 3.03 3.03
4 mA 1.71 1.71
6 mA 1.71 1.71
8 mA 0.53 0.53
12 mA 0.53 0.53
16 mA 0.59 0.59
24 mA 0.60 0.60
QuietIO 2 mA 27.67 27.67
4 mA 27.67 27.67
6 mA 27.67 27.67
8 mA 16.71 16.71
12 mA 16.67 16.67
16 mA 16.22 16.22
24 mA 12.11 12.11
Units
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Table 26: Output Timing Adjustments for IOB(Continued)
Convert Output Time from
LVCMOS25 with 12mA Drive and
Fast Slew Rate to the Following
Signal Standard (IOSTANDARD)
Add the
Adjustment
Below
Speed Grade
-5
-4
Units
LVCMOS33
Slow 2 mA 5.58 5.58
ns
4 mA 3.17 3.17
ns
6 mA 3.17 3.17
ns
8 mA 2.09 2.09
ns
12 mA 1.24 1.24
ns
16 mA 1.15 1.15
ns
24 mA 2.55⁽³⁾ 2.55⁽³⁾ ns
Fast 2 mA 3.02 3.02
ns
4 mA 1.71 1.71
ns
6 mA 1.72 1.72
ns
8 mA 0.53 0.53
ns
12 mA 0.59 0.59
ns
16 mA 0.59 0.59
ns
24 mA 0.51 0.51
ns
QuietIO 2 mA 27.67 27.67 ns
4 mA 27.67 27.67 ns
6 mA 27.67 27.67 ns
8 mA 16.71 16.71 ns
12 mA 16.29 16.29 ns
16 mA 16.18 16.18 ns
24 mA 12.11 12.11 ns
DS529-3 (v2.0) August 19, 2010
www.xilinx.com
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