參數(shù)資料
型號: 9DB306BL
廠商: INTEGRATED DEVICE TECHNOLOGY INC
元件分類: 時鐘及定時
英文描述: 9DB SERIES, PLL BASED CLOCK DRIVER, 6 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PDSO28
封裝: 4.40 X 9.70 MM, 0.925 MM HEIGHT, TSSOP-28
文件頁數(shù): 17/17頁
文件大?。?/td> 268K
代理商: 9DB306BL
ICS9DB306BL REVISION C AUGUST 13, 2009
9
2009 Integrated Device Technology, Inc.
ICS9DB306 Data Sheet
PCI EXPRESS JITTER ATTENUATOR
The clock layout topology shown below is a typical termination
for LVPECL outputs. The two different layouts mentioned are
recommended only as guidelines.
The differential outputs are low impedance follower outputs
that generate ECL/LVPECL compatible outputs. Therefore, ter-
minating resistors (DC current path to ground) or current
sources must be used for functionality. These outputs are de-
signed to drive 50
Ω transmission lines. Matched impedance
techniques should be used to maximize operating frequency
and minimize signal distortion.
Figures 4A and 4B show two
different layouts which are recommended only as guidelines.
Other suitable clock layouts may exist and it would be recom-
mended that the board designers simulate to guarantee com-
patibility across all printed circuit and clock component pro-
cess variations.
TERMINATION FOR LVPECL OUTPUTS
FIGURE 4B. LVPECL OUTPUT TERMINATION
FIGURE 4A. LVPECL OUTPUT TERMINATION
V
CC - 2V
50
Ω
50
Ω
RTT
Z
o = 50Ω
Z
o = 50Ω
FOUT
FIN
RTT =
Z
o
1
((V
OH + VOL) / (VCC – 2)) – 2
3.3V
125
Ω
125
Ω
84
Ω
84
Ω
Z
o = 50Ω
Z
o = 50Ω
FOUT
FIN
INPUTS:
LVCMOS CONTROL PINS
All control pins have internal pullups or pulldowns; additional
resistance is not required but can be added for additional
protection. A 1kW resistor can be used.
RECOMMENDATIONS FOR UNUSED INPUT AND OUTPUT PINS
OUTPUTS:
LVPECL OUTPUTS
All unused LVPECL outputs can be left floating. We recommend
that there is no trace attached. Both sides of the differential output
pair should either be left floating or terminated.
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