023AI datasheet(8/13 Pages) ICST

Part #	023AI

Description	FEMTOCLOCKS-TM CRYSTAL-TO-3.3V, 2.5V LVPECL CLOCK GENERATOR

PDF	13 Pages

Scroll/Zoom	100%

Manufacturer	ICST [Integrated Circuit Systems]

Direct Link	http://www.icst.com

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8 / 13 page

843023AGI

www.icst.com/products/hiperclocks.html

REV. A JUNE 29, 2005

Integrated

Circuit

Systems, Inc.

ICS843023I

FEMTOCLOCKS™CRYSTAL-TO-3.3V, 2.5V

LVPECL CLOCK GENERATOR

TERMINATION FOR 2.5V LVPECL OUTPUT

Figure 3A and Figure 3B show examples of termination for 2.5V

LVPECL driver. These terminations are equivalent to terminat-

ing 50

Ω to V

CC - 2V. For VCC = 2.5V, the VCC - 2V is very close to

ground level. The R3 in Figure 3B can be eliminated and the

termination is shown in

Figure 3C.

FIGURE 3C. 2.5V LVPECL TERMINATION EXAMPLE

FIGURE 3B. 2.5V LVPECL DRIVER TERMINATION EXAMPLE

FIGURE 3A. 2.5V LVPECL DRIVER TERMINATION EXAMPLE

62.5

Zo = 50 Ohm

250

2.5V

2,5V LVPECL

Driv er

62.5

250

Zo = 50 Ohm

2.5V

VCC=2.5V

Zo = 50 Ohm

2,5V LVPECL

Driv er

VCC=2.5V

2.5V

2,5V LVPECL

Driv er

VCC=2.5V

2.5V

Zo = 50 Ohm

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