8S89874BKILF IDT [Integrated Device Technology], 8S89874BKILF Datasheet - Page 12

• Manufacturer Part Number: 8S89874BKILF
• Description: 1:2 Differential-to-LVPECL Buffer/Divider
• Manufacturer: IDT [Integrated Device Technology]

ICS8S89874I Data Sheet
Termination for 2.5V LVPECL Outputs
Figure 5A and Figure 5B show examples of termination for 2.5V
LVPECL driver. These terminations are equivalent to terminating 50Ω
to V
Figure 5A. 2.5V LVPECL Driver Termination Example
Figure 5C. 2.5V LVPECL Driver Termination Example
ICS8S89874BKI REVISION A OCTOBER 22, 2010
CC
V
V
CC
CC
– 2V. For V
2.5V LVPECL Driver
2.5V LVPECL Driver
= 2.5V
= 2.5V
CC
= 2.5V, the V
50Ω
50Ω
50Ω
50Ω
CC
R1
250Ω
– 2V is very close to ground
2.5V
R2
62.5Ω
R1
50Ω
R3
250Ω
R4
62.5Ω
R2
50Ω
+
+
–
–
2.5V
2.5V
12
level. The R3 in Figure 5B can be eliminated and the termination is
shown in Figure 5C.
Figure 5B. 2.5V LVPECL Driver Termination Example
V
CC
2.5V LVPECL Driver
= 2.5V
50Ω
50Ω
1:2 DIFFERENTIAL-TO-LVPECL BUFFER/DIVIDER
©2010 Integrated Device Technology, Inc.
R1
50Ω
R2
50Ω
R3
18Ω
+
–
2.5V