Datasheet

SCBA015A
7–16
Fast GTLP Backplanes With the GTLPH1655
Z
O
= 25 Ω
a) No Termination
b) Termination With R
TT
= Z
O
R
TT
= 25 Ω
0 τ
c) Termination With ∞ > R
TT
> Z
O
R
TT
= ∞
0
R
TT
= 100 Ω
τ 2τ 3τ 4τ 5τ 6τ 7τ
d) AC Termination
0
e) Termination With Two Resistors
R
TT2
= 220 Ω
0
f) Active Termination
0
R
TT
= 100 Ω
R
TT1
= 180 Ω
R
TT
= R
TT1
|| R
TT2
ττ 2τ 3τ 4τ 5τ 6τ 7τ
ττ 2τ 3τ 4τ 5τ 6τ 7τ
ττ 2τ 3τ 4τ 5τ 6τ 7τ
R
TT
= 100 Ω
C
T
R
TT
× C
T
> 4τ
V
CC
ττ 2τ 3τ 4τ 5τ 6τ 7τ
Z
O
= 25 Ω
Z
O
= 25 Ω
Z
O
= 25 Ω
Z
O
= 25 Ω
Z
O
= 25 Ω
A
A
A
A
A
A
B
B
B
B
A
A
A
A
A
A
V
V
V
V
V
V
B
B
B
B
B
B
0 ττ 2τ 3τ 4τ 5τ 6τ 7τ
3 V
B
B
Figure 8. Termination Methods With TTL and CMOS Circuits