參數(shù)資料
型號(hào)： ICS83905AKLFT
廠商： INTEGRATED DEVICE TECHNOLOGY INC
元件分類： XO, clock
英文描述： LOW SKEW, 1:6 CRYSTAL-TO-LVCMOS/LVTTL FANOUT BUFFER
中文描述： 100 MHz, OTHER CLOCK GENERATOR, QCC20
封裝： 4 X 4 MM, 0.90 MM HEIGHT, ROHS COMPLIANT, MO-220, VFQFN-20
文件頁(yè)數(shù)： 11/19頁(yè)
文件大?。?/td> 459K
代理商： ICS83905AKLFT
IDT
/ ICS
LVCMOS/LVTTL FANOUT BUFFER
11
ICS83905AM REV. B JULY 9, 2007
ICS83905
LOW SKEW, 1:6 CRYSTAL-TO-LVCMOS/LVTTL FANOUT BUFFER
A
PPLICATION
I
NFORMATION
C
RYSTAL
I
NPUT
I
NTERFACE
Figure 2
shows an example of ICS83905 crystal interface with a
parallel resonant crystal. The frequency accuracy can be fine
tuned by adjusting the C1 and C2 values. For a parallel crystal
with loading capacitance CL = 18pF, we suggest C1 = 15pF and
C2 = 15pF to start with. These values may be slightly fine tuned
further to optimize the frequency accuracy for different board
layouts. Slightly increasing the C1 and C2 values will slightly reduce
the frequency. Slightly decreasing the C1 and C2 values will slightly
increase the frequency. For the oscillator circuit below, R1 can be
used, but is not required. For new designs, it is recommended
that R1 not be used.
F
IGURE
2. C
RYSTAL
O
SCILLATOR
I
NTERFACE
C1
15p
R1 (optional)
0
X1
18pF Parallel Crystal
C2
15p
XTAL_IN
XTAL_OUT
LVCMOS
TO
XTAL I
NTERFACE
The XTAL_IN input can accept a single-ended LVCMOS
signal through an AC couple capacitor. A general interface
diagram is shown in
Figure 3.
The XTAL_OUT pin can be left
floating. The input edge rate can be as slow as 10ns. For
LVCMOS inputs, it is recommended that the amplitude be
reduced from full swing to half swing in order to prevent signal
interference with the power rail and to reduce noise. 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
Ω
applications, R1
and R2 can be 100
Ω
.
This can also be accomplished by
removing R1 and making R2 50
Ω
.
F
IGURE
3. G
ENERAL
D
IAGRAM
FOR
LVCMOS D
RIVER
TO
XTAL I
NPUT
I
NTERFACE
XTAL_IN
XTAL_OUT
VCC
DD
R2
Ro
R1
Zo = 50
Rs
VCC
DD
.1uf
Zo = Ro + Rs
相關(guān)PDF資料
PDF描述
ICS83908AGI-02 LOW SKEW, 1-TO-8 CRYSTAL-TO-LVCMOS FANOUT BUFFER
ICS83908AGI-02LF LOW SKEW, 1-TO-8 CRYSTAL-TO-LVCMOS FANOUT BUFFER
ICS83908AGI-02LFT LOW SKEW, 1-TO-8 CRYSTAL-TO-LVCMOS FANOUT BUFFER
ICS83908AGI-02T LOW SKEW, 1-TO-8 CRYSTAL-TO-LVCMOS FANOUT BUFFER
ICS83908I-02 LOW SKEW, 1-TO-8 CRYSTAL-TO-LVCMOS FANOUT BUFFER
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ICS83905AKT 制造商:ICS 制造商全稱:ICS 功能描述:LOW SKEW, 1:6 CRYSTAL INTERFACE-TOLVCMOS / LVTTL FANOUT BUFFER
ICS83905AM 制造商:ICS 制造商全稱:ICS 功能描述:LOW SKEW, 1:6 CRYSTAL INTERFACE-TOLVCMOS / LVTTL FANOUT BUFFER
ICS83905AMLF 功能描述:IC CLK BUFFER 1:6 100MHZ 16-SOIC RoHS:是 類別:集成電路 (IC) >> 時(shí)鐘/計(jì)時(shí) - 時(shí)鐘緩沖器，驅(qū)動(dòng)器 系列:HiPerClockS™ 產(chǎn)品培訓(xùn)模塊:High Bandwidth Product Overview 標(biāo)準(zhǔn)包裝:1,000 系列:Precision Edge® 類型:扇出緩沖器（分配） 電路數(shù):1 比率 - 輸入:輸出:1:4 差分 - 輸入:輸出:是/是 輸入:CML，LVDS，LVPECL 輸出:CML 頻率 - 最大:2.5GHz 電源電壓:2.375 V ~ 2.625 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:16-VFQFN 裸露焊盤(pán)，16-MLF? 供應(yīng)商設(shè)備封裝:16-MLF?（3x3） 包裝:帶卷 (TR)
ICS83905AMLFT 功能描述:IC CLK BUFFER 1:6 100MHZ 16-SOIC RoHS:是 類別:集成電路 (IC) >> 時(shí)鐘/計(jì)時(shí) - 時(shí)鐘緩沖器，驅(qū)動(dòng)器 系列:HiPerClockS™ 標(biāo)準(zhǔn)包裝:74 系列:- 類型:扇出緩沖器（分配） 電路數(shù):1 比率 - 輸入:輸出:1:10 差分 - 輸入:輸出:是/是 輸入:HCSL, LVCMOS, LVDS, LVPECL, LVTTL 輸出:HCSL，LVDS 頻率 - 最大:400MHz 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:32-VFQFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:32-QFN（5x5） 包裝:管件
ICS83905AMT 制造商:ICS 制造商全稱:ICS 功能描述:LOW SKEW, 1:6 CRYSTAL INTERFACE-TOLVCMOS / LVTTL FANOUT BUFFER
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