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ICS853111AY Datasheet(PDF) 11 Page - Integrated Device Technology

Part # ICS853111AY
Description  LOW SKEW, 1-TO-10, DIFFERENTIAL-TOLVPECL/ ECL FANOUT BUFFER
PDF  19 Pages
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Manufacturer  IDT [Integrated Device Technology]
Direct Link  http://www.idt.com
Logo IDT - Integrated Device Technology

ICS853111AY Datasheet(HTML) 11 Page - Integrated Device Technology

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IDT™ / ICS™ 1-TO-10, LVPECL/ECL FANOUT BUFFER
11
ICS853111AY REV. C OCTOBER 25, 2007
ICS853111A
LOW SKEW, 1-TO-10, DIFFERENTIAL-TO-LVPECL/ECL FANOUT BUFFER
TERMINATION FOR 2.5V LVPECL OUTPUT
Figure 5A and Figure 5B show examples of termination for 2.5V
LVPECL driver. These terminations are equivalent to terminating
50
Ω 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.
R2
50
Zo = 50 Ohm
VCCO=2.5V
R1
50
Zo = 50 Ohm
+
-
2.5V
2,5V LVPECL
Driv er
FIGURE 5B. 2.5V LVPECL DRIVER TERMINATION EXAMPLE
VCCO=2.5V
R1
50
R2
50
Zo = 50 Ohm
R3
18
2,5V LVPECL
Driv er
Zo = 50 Ohm
+
-
2.5V
FIGURE 5A. 2.5V LVPECL DRIVER TERMINATION EXAMPLE
R2
62.5
2.5V
2,5V LVPECL
Driv er
R3
250
Zo = 50 Ohm
Zo = 50 Ohm
R4
62.5
2.5V
+
-
R1
250
VCCO=2.5V
FIGURE 5C. 2.5V LVPECL TERMINATION EXAMPLE
TERMINATION FOR 5V LVPECL OUTPUT
This section shows examples of 5V LVPECL output termination.
Figure 6A shows standard termination for 5V LVPECL. The
termination requires matched load of 50
Ω resistors pull down to
Zo = 50 Ohm
R2
50
Zo = 50 Ohm
5V
3V
PECL
+
-
R1
50
5V
PECL
R4
84
5V
Zo = 50 Ohm
R3
84
R2
125
5V
PECL
PECL
+
-
Zo = 50 Ohm
R1
125
FIGURE 6A. STANDARD 5V LVPECL OUTPUT TERMINATION
FIGURE 6B. 5V LVPECL OUTPUT TERMINATION EXAMPLE
V
CC
- 2V = 3V at the receiver. Figure 6B shows Thevenin
equivalence of Figure 6A. In actual application where the 3V DC
power supply is not available, this approached is normally used.



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