ICS8536-02 Datasheet, PDF (12/17 Pages) Integrated Device Technology – Low Skew, 1-to-6, Dual Crystal/LVCMOS-to-3.3V, 2.5V LVPECL Fanout Buffer

ICS8536-02 Data Sheet
1-TO-6, DUALCRYSTAL/LVCMOS-TO-3.3V, 2.5V LVPECL FANOUT BUFFER
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_CC – 2V. For V_CC = 2.5V, the V_CC – 2V is very close to
ground level. The R3 in Figure 5B can be eliminated and the
termination is shown in Figure 5C.
V_CCO = 2.5V
50Ω
50Ω
2.5V LVPECL Driver
2.5V
R1
R3
250
250
2.5V
+
–
R2
R4
62.5
62.5
Figure 5A. 2.5V LVPECL Driver Termination Example
VCCO = 2.5V
50Ω
50Ω
2.5V LVPECL Driver
2.5V
+
–
R1
R2
50
50
R3
18
Figure 5B. 2.5V LVPECL Driver Termination Example
VCCO = 2.5V
50Ω
50Ω
2.5V LVPECL Driver
2.5V
+
–
R1
R2
50
50
Figure 5C. 2.5V LVPECL Driver Termination Example
ICS8536AG-02 REVISION A JULY 21, 2010
12
©2010 Integrated Device Technology, Inc.