參數(shù)資料
型號: IDT82V3285EQG
廠商: IDT, Integrated Device Technology Inc
文件頁數(shù): 58/147頁
文件大?。?/td> 0K
描述: IC PLL WAN SE STRATUM 100TQFP
標(biāo)準(zhǔn)包裝: 1
類型: 時(shí)鐘/頻率發(fā)生器,多路復(fù)用器
PLL:
主要目的: 以太網(wǎng),SONET/SDH,Stratum
輸入: CMOS,LVDS,PECL
輸出: CMOS,LVDS,PECL
電路數(shù): 1
比率 - 輸入:輸出: 5:5
差分 - 輸入:輸出: 是/是
頻率 - 最大: 622.08MHz
電源電壓: 3 V ~ 3.6 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 100-LQFP 裸露焊盤
供應(yīng)商設(shè)備封裝: 100-TQFP-EP(14x14)
包裝: 托盤
IDT82V3285
WAN PLL
Functional Description
18
December 9, 2008
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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