参数资料
型号: IDT82V3355TFG
厂商: IDT, Integrated Device Technology Inc
文件页数: 45/135页
文件大小: 0K
描述: IC PLL WAN SYNC ETH 64-TQFP
标准包装: 1
类型: 时钟/频率发生器,多路复用器
PLL:
主要目的: 以太网,SONET/SDH,Stratum
输入: CMOS,LVDS,PECL
输出: CMOS,LVDS,PECL
电路数: 1
比率 - 输入:输出: 3:2
差分 - 输入:输出: 是/是
频率 - 最大: 622.08MHz
电源电压: 3 V ~ 3.6 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 64-LQFP
供应商设备封装: 64-TQFP(10x10)
包装: 托盘
其它名称: 82V3355TFG
IDT82V3355
SYNCHRONOUS ETHERNET WAN PLL
Functional Description
17
May 19, 2009
3
FUNCTIONAL DESCRIPTION
3.1
RESET
The reset operation resets all registers and state machines to their
default value or status.
After power on, the device must be reset for normal operation.
For a complete reset, the RST pin must be asserted low for at least
50 s. After the RST pin is pulled high, the device will still be in reset
state for 500 ms (typical). If the RST pin is held low continuously, the
device remains in reset state.
3.2
MASTER CLOCK
A nominal 12.8000 MHz clock, provided by a crystal oscillator, is
input on the OSCI pin. This clock is provided for the device as a master
clock. The master clock is used as a reference clock for all the internal
circuits. A better active edge of the master clock is selected by the
OSC_EDGE bit to improve jitter and wander performance.
In fact, an offset from the nominal frequency may input on the OSCI
pin.
This
offset
can
be
compensated
by
setting
the
NOMINAL_FREQ_VALUE[23:0] bits. The calibration range is within
±741 ppm.
The performance of the master clock should meet GR-1244-CORE,
GR-253-CORE, ITU-T G.812 and G.813 criteria.
Table 2: Related Bit / Register in Chapter 3.2
Bit
Register
Address (Hex)
NOMINAL_FREQ_VALUE[23:0]
NOMINAL_FREQ[23:16]_CNFG, NOMINAL_FREQ[15:8]_CNFG, NOMINAL_FREQ[7:0]_CNFG
06, 05, 04
OSC_EDGE
DIFFERENTIAL_IN_OUT_OSCI_CNFG
0A
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