Differential Hstl Class I - Xilinx SelectIO 7 Series User Manual

Chapter 1: SelectIO Resources

Differential HSTL Class I

Figure 1-47
HSTL class-I (1.5V or 1.8V) with unidirectional termination. In a specific circuit, all drivers
and receivers must be at the same voltage level (either 1.5V or 1.8V); they are not
interchangeable.
X-Ref Target - Figure 1-47
64
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shows a sample circuit illustrating a termination technique for differential
External Termination
IOB
DIFF_HSTL_I
DIFF_HSTL_I_18
DIFF_HSTL_I
DIFF_HSTL_I_18
Figure 1-47: Differential HSTL Class I (1.5V or 1.8V) Unidirectional Termination
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V = 0.75V for HSTL_I
TT
0.9V for HSTL_I_18
50Ω
Z 0
V = 0.75V for HSTL_I
TT
0.9V for HSTL_I_18
50Ω
Z 0
7 Series FPGAs SelectIO Resources User Guide
IOB
DIFF_HSTL_I
DIFF_HSTL_I_18
+
–
ug471_c1_37_011811
UG471 (v1.10) May 8, 2018