ICS858012 View Datasheet(PDF) - Integrated Circuit Systems

Part Name

Description

MFG CO.

ICS858012

LOW SKEW, 1-TO-2, DIFFERENTIAL-TO-2.5V, 3.3V LVPECL FANOUT BUFFER

Integrated Circuit Systems 

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Integrated

Circuit

Systems, Inc.

PRELIMINARY

ICS858012

LOW SKEW, 1-TO-2, DIFFERENTIAL-TO-

2.5V, 3.3V LVPECL FANOUT BUFFER

TERMINATION FOR 2.5V LVPECL OUTPUT

Figure 6A and Figure 6B show examples of termination for 2.5V

LVPECL driver.These terminations are equivalent to terminat-

ing 50Ω to VCC - 2V. For VCC = 2.5V, the VCC - 2V is very close to

ground level. The R3 in Figure 6B can be eliminated and the

termination is shown in Figure 6C.

VC C=2. 5V

Zo = 50 Ohm

Zo = 50 Ohm

2,5V LVPECL

Driv er

2. 5V

R1

R3

250

250

2.5V

+

-

R2

62. 5

R4

62. 5

VCC=2.5V

Zo = 50 Ohm

Zo = 50 Ohm

2,5V LVPECL

Driv er

2. 5V

+

-

R1

R2

50

50

R3

18

FIGURE 6A. 2.5V LVPECL DRIVER TERMINATION EXAMPLE

FIGURE 6B. 2.5V LVPECL DRIVER TERMINATION EXAMPLE

VC C=2. 5V

Zo = 50 Ohm

Zo = 50 Ohm

2,5V LVPECL

Driv er

2.5V

+

-

R1

R2

50

50

FIGURE 6C. 2.5V LVPECL TERMINATION EXAMPLE

858012AK

www.icst.com/products/hiperclocks.html

10

REV. A NOVEMBER 28, 2005

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