ICS83905 datasheet(10/14 Pages) ICST

10 / 14 page

83905AM

http://www.icst.com/products/hiperclocks.html

REV. A JANUARY 20, 2005

Integrated

Circuit

Systems, Inc.

ICS83905

LOW SKEW, 1:6 CRYSTAL INTERFACE-TO-

LVCMOS / LVTTL FANOUT BUFFER

PRELIMINARY

APPLICATION INFORMATION

CRYSTAL INPUT INTERFACE, FUNDAMENTAL

Figure 1A shows an example of ICS83905 crystal interface with

parallel resonance crystal using fundamental frequency.The C1,

C2 and R1 values are suggested for the best frequency accu-

100

XTAL_IN

XTAL_OUT

16p

10p

XTAL_IN

XTAL_OUT

10p

16p

CRYSTAL INPUT INTERFACE, 3RD OVERTONE

Figure 1B shows an example of ICS83905 crystal interface with

parallel resonance crystal using 3rd overtone frequency. The C1,

C2 values are suggested for the best frequency accuracy ppm.

racy ppm. The optimum C1 and C2 values can be adjusted to

improve the frequency accuracy for stray capacitance of differ-

ent board layout.

FIGURE 1A. CRYSTAL OSCILLATOR INTERFACE, (FUNDAMENTAL)

The optimum C1 and C2 values can be adjusted to improve the

frequency accuracy for stray capacitance of different board lay-

out.The C3 and L1 can be calculated from the given equation.

FIGURE 1B. CRYSTAL OSCILLATOR INTERFACE (3RD OVERTONE)

fund

ICS83905 Fiches technique(PDF) 10 Page - Integrated Circuit Systems