Altera Stratix - Differential HSTL Termination

5–48 Altera Corporation
Stratix Device Handbook, Volume 2 July 2005
Differential I/O Termination
Figure 5–35. PCML Differential Termination
Differential HSTL Termination
The HSTL Class I and II I/O standards require a 0.75-V V
REF
and a 0.75-
V V
TT
. Figures 5–36 and 5–37 show the device with differential
termination for HSTL Class I and II I/O standard.
Figure 5–36. Differential HSTL Class I Termination
Differential
Transmitter
Differential
Receiver
Z
0
= 50 Ω
50 Ω 50 Ω50 Ω 50 Ω
Z
0
= 50 Ω
V
TT
Differential
Transmitter
Differential
Receiver
Z
0
= 50 Ω
50 Ω 50 Ω
Z
0
= 50 Ω
V
TT
= 0.75 V V
TT
= 0.75 V