參數(shù)資料
型號: ICS8430S10BYI-02LF
廠商: IDT, Integrated Device Technology Inc
文件頁數(shù): 10/31頁
文件大小: 0K
描述: IC CLK GENERATOR PLL 48TQFP
標準包裝: 250
類型: 時鐘/頻率發(fā)生器,扇出緩沖器(分配),多路復用器
PLL:
主要目的: Cavium 處理器
輸入: LVCMOS,LVDS,LVPECL,LVTTL,SSTL,晶體
輸出: LVCMOS,LVDS,LVPECL,LVTTL
電路數(shù): 1
比率 - 輸入:輸出: 2:10
差分 - 輸入:輸出: 是/是
頻率 - 最大: 133.33MHz
電源電壓: 3.135 V ~ 3.465 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 48-TQFP 裸露焊盤
供應商設備封裝: 48-PTQFP-EP(7x7)
包裝: 托盤
ICS8430S10BYI-02 REVISION C JANUARY 17, 2011
18
2011 Integrated Device Technology, Inc.
ICS8430S10I-02 Data Sheet
CLOCK GENERATOR FOR CAVIUM PROCESSORS
Overdriving the XTAL Interface
The XTAL_IN input can accept a single-ended LVCMOS signal
through an AC coupling capacitor. A general interface diagram is
shown in Figure 3A. The XTAL_OUT pin can be left floating. The
maximum amplitude of the input signal should not exceed 2V and the
input edge rate can be as slow as 10ns. This configuration requires
that the output impedance of the driver (Ro) plus the series
resistance (Rs) equals the transmission line impedance. In addition,
matched termination at the crystal input will attenuate the signal in
half. This can be done in one of two ways. First, R1 and R2 in parallel
should equal the transmission line impedance. For most 50
applications, R1 and R2 can be 100
. This can also be
accomplished by removing R1 and making R2 50
. By overdriving
the crystal oscillator, the device will be functional, but note, the device
performance is guaranteed by using a quartz crystal.
Figure 3A. General Diagram for LVCMOS Driver to XTAL Input Interface
Figure 3B. General Diagram for LVPECL Driver to XTAL Input Interface
VCC
XTAL_OUT
XTAL_IN
R1
100
R2
100
Zo = 50 ohms
Rs
Ro
Zo = Ro + Rs
C1
.1uf
LVCMOS Driver
XTAL_OUT
XTAL_IN
Zo = 50 ohms
C2
.1uf
LVPECL Driver
Zo = 50 ohms
R1
50
R2
50
R3
50
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