参数资料
型号: SM3-19.44M
厂商: Connor-Winfield
文件页数: 2/36页
文件大小: 0K
描述: IC MOD TIMING 19.440MHZ STATUM 3
标准包装: 1
系列: SM3
类型: 定时模块,系统时钟
PLL:
主要目的: 以太网,ADM,DSLAM,SONET/SDH,Stratum,TDM
输入: LVCMOS
输出: LVCMOS
电路数: 1
比率 - 输入:输出: 4:3
差分 - 输入:输出: 无/无
频率 - 最大: 19.44MHz
电源电压: 3.135 V ~ 3.465 V
工作温度: 0°C ~ 70°C
安装类型: 通孔
封装/外壳: 32-DIP 模块
包装: 管件
其它名称: CW642
SM3 19.44M
SM319.44M
SM3 Data Sheet #:
TM052
Page 10 of 36 Rev: 06 Date:01/26/11
Copyright 2011 The Connor-Winfield Corp. All Rights Reserved
Specifications subject to change without notice
Detailed Description continued
The automatic reference selection is shown in the following state diagram:
The operational mode is according to the following state diagram:
No available reference and no Hold Over history
Ref loss w/no good Hold Over history and no other available reference
Automatic Reference Selection
Figure 6
Automatic Operational Mode Selection
Figure 7
Locked
on Ref n
Select &
Lock on
Ref m
Ref n returns,
Ref m marked
“non-revertive”
Locked on Ref m
time for t=
Ref_Rev_Delay
time expired
Loss of Ref n
Select new reference:
Qualified (within max. pull-in range, signal present > 10 sec.),
Non-masked
Ref n returns,
Ref m marked
“revertive”
Next highest priority,
Stay
Ref
Return
Ref Loss w/good hold over history
and no alternate reference available
Ref Loss w/alternate
reference available
Return
Ref
Ref loss w/no good hold
over history and no other
available reference
No available
reference and
no hold over
history
Reference Available
Locked
Hold Over
Free Run
(Select highest priority)
Higher priority Ref return with
prior reference marked
“revertive”
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