FIN XRT8000 CLK1 CLK2 T1, T1/8 or E1, E1/8 8 kHz Figure 11. Slave Rever" />
參數(shù)資料
型號: XRT8000IDTR-F
廠商: Exar Corporation
文件頁數(shù): 14/24頁
文件大小: 0K
描述: IC WAN CLOCK E1/E1 DUAL 18SOIC
產(chǎn)品變化通告: Packaging Change 15/Jul/2010
標準包裝: 1,000
類型: 時鐘/頻率發(fā)生器,同步器,多路復用器
PLL:
主要目的: 電信
輸入: 時鐘
輸出: 時鐘
電路數(shù): 1
比率 - 輸入:輸出: 1:2
差分 - 輸入:輸出: 無/無
頻率 - 最大: 2.048MHz
電源電壓: 3.135 V ~ 5.25 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 18-SOIC(0.295",7.50mm 寬)
供應商設備封裝: 18-SOIC
包裝: 帶卷 (TR)
XRT8000
21
Rev. 1.11
SYNC
8 kHz
FIN
XRT8000
CLK1
CLK2
T1, T1/8
or
E1, E1/8
8 kHz
Figure 11. Slave Reverse Mode (Cont’d)
Output
Freq.
kHz
1544
193
2048
256
Board Layout Considerations
The CLK1 and CLK 2 outputs are surrounded with supply
pins (GND(514),Vcc(712). It is recommended to
decouple these supplies with a 0.1uF very close to the
pins. The positive supply (7,12,15) and ground pins
(4,5,14) can all be connected to the Digital Supply and
Ground.
The internal VCO has its proper supply’s pins (GND 9,
Vcc 10) these supply pins have to be decoupled by a
0.1uF capacitor and should be connected to an Analog
Supply if possible. If there is no Analog Supply, then
connect these pins as close as possible to the supply
source.
If the layout is done with separate layers for the supplies,
cut an island under the XTT8000 such that no current
flows under the circuit. It has been observed that coupling
can occur because heavy digital currents are flowing
under the locations of the XRT8000.
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