参数资料
型号: XRT8001IP-F
厂商: Exar Corporation
文件页数: 26/48页
文件大小: 0K
描述: IC WAN CLOCK E1/E1 DUAL 18PDIP
产品变化通告: XRT obsolescence 05/Mar/2012
标准包装: 41
类型: 时钟/频率发生器
PLL:
主要目的: 以太网(WAN),T1/E1
输入: 时钟
输出: 时钟
电路数: 1
比率 - 输入:输出: 1:2
差分 - 输入:输出: 无/无
频率 - 最大: 16.384kHz
电源电压: 3.3 V ~ 5 V
工作温度: -40°C ~ 85°C
安装类型: 通孔
封装/外壳: 18-DIP(0.300",7.62mm)
供应商设备封装: 18-PDIP
包装: 管件
XRT8001
32
Rev. 1.01
1.544 MHz or
2.048 MHz
1.544 MHz or
2.048 MHz
CLK1
CLK2
6
13
8 kHz
FIN
3
Figure 19. XRT8001 Reverse/Slave Mode
6.10 Phase relationship between the “FIN” input
and the “CLK1 and CLK2” outputs
The Phase relationship depends upon whether the
XRT8001 is operating in the “Slave” or “Master” Mode.
6.11 Slave Mode:
If the XRT8001 is operating in the “Slave” Mode, then
there is a specific phase relationship between the “FIN”
and the “CLK1, CLK2” outputs. The reasons are as
follows.
For Slave Mode Operation, the XRT8001 accepts a
8kHz clock signal (which it will also synthesize and
output via the SYNC output signal). Each of the two
PLLs (within the XRT8001) will be configured to gener-
ate either a “K x 56kHz” or a “K x 64kHz” clock signal.
Hence, in the “Slave Mode”, the “SYNC” output, is
simply a buffered version of the “FIN” input. Therefore,
generate a “K x 56kHz” clock signal.
the “SYNC” signal is approximately 4ns delayed from
the “FIN” input signal.
Each of the two PLLs “lock” onto the “SYNC” signal, for
frequency synthesis.
This timing relationship (between FIN and the CLK1,
CLK2 signals) depends upon the “CLK1” and “CLK2”
signal frequencies and as listed in the following tables.
NOTES:
1.
Table 9 presents the timing relationship between the
“FIN” and the “CLK1, CLK2” if the PLLs are configured
generate a “K x 64kHz” clock signal.
2.
Table 10 presents the timing relationship between the
“FIN” and the “CLK1, CLK2” if the PLLs are configured to
generate a “K x 56kHz” clock signal.
FIN
CLK2
T
CLK1
or
Figure 20: Timing Relationship between the FIN and the “CLK1/CLK2” outputs
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