ICS853S9252I Datasheet, PDF (12/21 Pages) Integrated Device Technology – 2.5V, 3.3V ECL/LVPECL Clock/Data Fanout Buffer

ICS853S9252I Datasheet
2.5V, 3.3V ECL/LVPECL CLOCK/DATA FANOUT BUFFER
Termination for 2.5V LVPECL Outputs
Figure 6A and Figure 6B show examples of termination for 2.5V
LVPECL driver. These terminations are equivalent to terminating 50
to V_CC – 2V. For V_CC = 2.5V, the V_CC – 2V is very close to ground
level. The R3 in Figure 6B can be eliminated and the termination is
shown in Figure 6C.
VCC = 2.5V
50Ω
50Ω
2.5V LVPECL Driver
2.5V
R1
250Ω
R3
250Ω
2.5V
+
–
R2
62.5Ω
R4
62.5Ω
VCC = 2.5V
50Ω
50Ω
2.5V LVPECL Driver
2.5V
+
–
R1
R2
50Ω
50Ω
R3
18Ω
Figure 6A. 2.5V LVPECL Driver Termination Example
Figure 6B. 2.5V LVPECL Driver Termination Example
VCC = 2.5V
50Ω
50Ω
2.5V LVPECL Driver
2.5V
+
–
R1
R2
50Ω
50Ω
Figure 6C. 2.5V LVPECL Driver Termination Example
ICS853S9252BKI JUNE 14, 2017
12
©2017 Integrated Device Technology, Inc.