参数资料
型号: ICS8430S07AKILFT
厂商: INTEGRATED DEVICE TECHNOLOGY INC
元件分类: 时钟产生/分配
英文描述: 133.333 MHz, OTHER CLOCK GENERATOR, QCC32
封装: 5 X 5 MM, 0.925 MM HEIGHT, ROHS COMPLIANT, MO-220VHHD-2/-4, VFQFN-32
文件页数: 7/23页
文件大小: 1792K
代理商: ICS8430S07AKILFT
ICS8430S07I
CLOCK GENERATOR FOR CAVIUM PROCESSORS
PRELIMINARY
IDT / ICS CLOCK GENERATOR
15
ICS8430S07AKI REV. A DECEMBER 4, 2007
Termination for 3.3V LVPECL Outputs
The clock layout topology shown below is a typical termination for
LVPECL outputs. The two different layouts mentioned are
recommended only as guidelines.
FOUT and nFOUT are low impedance follower outputs that
generate ECL/LVPECL compatible outputs. Therefore, terminating
resistors (DC current path to ground) or current sources must be
used for functionality. These outputs are designed to drive 50
transmission lines. Matched impedance techniques should be
used to maximize operating frequency and minimize signal
distortion. Figures 6A and 6B show two different layouts which are
recommended only as guidelines. Other suitable clock layouts may
exist and it would be recommended that the board designers
simulate to guarantee compatibility across all printed circuit and
clock component process variations.
Figure 6A. 3.3V LVPECL Output Termination
Figure 6B. 3.3V LVPECL Output Termination
V
CC - 2V
50
50
RTT
Z
o = 50
Z
o = 50
FOUT
FIN
RTT =
Z
o
1
((V
OH + VOL) / (VCC – 2)) – 2
3.3V
125
125
84
84
Z
o = 50
Z
o = 50
FOUT
FIN
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