ICS853013AM Просмотр технического описания (PDF) - Integrated Circuit Systems

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ICS853013AM

LOW SKEW, DUAL, 1-TO-3, DIFFERENTIAL-TO-2.5V/3.3V/5V LVPECL/ECL FANOUT BUFFER

Integrated Circuit Systems 

Integrated

Circuit

Systems, Inc.

ICS853013

LOW SKEW, DUAL, 1-TO-3, DIFFERENTIAL-TO-

2.5V/3.3V/5V LVPECL/ECL FANOUT BUFFER

TERMINATION FOR 2.5V LVPECL OUTPUT

Figure 4A and Figure 4B show examples of termination for

2.5V LVPECL driver. These terminations are equivalent to ter-

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

close to ground level. The R3 in Figure 4B can be eliminated

and the termination is shown in Figure 4C.

VCC=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

FIGURE 4A. 2.5V LVPECL DRIVER TERMINATION EXAMPLE

VCC=2.5V

Zo = 50 Ohm

Zo = 50 Ohm

2,5V LVPECL

Driv er

2.5V

+

-

R1

R2

50

50

R3

18

FIGURE 4B. 2.5V LVPECL DRIVER TERMINATION EXAMPLE

VCC=2.5V

Zo = 50 Ohm

Zo = 50 Ohm

2,5V LVPECL

Driv er

2.5V

+

-

R1

R2

50

50

FIGURE 4C. 2.5V LVPECL TERMINATION EXAMPLE

853013AM

www.icst.com/products/hiperclocks.html

11

REV. A OCTOBER 19, 2005

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