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參數(shù)資料
| 型號： | ICS83908AGI-02 |
| 廠商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分類： | XO, clock |
| 英文描述： | LOW SKEW, 1-TO-8 CRYSTAL-TO-LVCMOS FANOUT BUFFER |
| 中文描述： | 40 MHz, OTHER CLOCK GENERATOR, PDSO24 |
| 封裝： | 4.40 X 7.80 MM, 0.92 MM HEIGHT, MO-153, TSSOP-24 |
| 文件頁數(shù)： | 11/16頁 |
| 文件大?。?/td> | 301K |
| 代理商： | ICS83908AGI-02 |
IDT
/ ICS
LVCMOS FANOUT BUFFER
11
ICS83908AGI-02 REV. B JULY 24, 2007
ICS83908I-02
LOW SKEW, 1-TO-8 CRYSTAL-TO-LVCMOS FANOUT BUFFER
PRELIMINARY
A
PPLICATION
I
NFORMATION
F
IGURE
1. Crystal Input Interface
C
RYSTAL
I
NPUT
I
NTERFACE
A crystal can be characterized for either series or parallel mode
operation. The ICS83908I-02 has a built-in crystal oscillator
circuit. This interface can accept either a series or parallel
crystal without additional components and generate fre-
quencies with accuracy suitable for most applications. Additional
accuracy can be achieved by adding two small capacitors C1
and C2 as shown in
Figure 1
. Typical results using parallel 18pF
crystals are shown in Table 5.
C1
15p
X1
18pF Parallel Crystal
C2
15p
XTAL_OUT
XTAL_IN
LVCMOS
TO
XTAL I
NTERFACE
The XTAL_IN input can accept a single-ended LVCMOS signal
through an AC coupling capacitor. A general interface diagram is
shown in
Figure 2.
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
F
IGURE
2. G
ENERAL
D
IAGRAM
FOR
LVCMOS D
RIVER
TO
XTAL I
NPUT
I
NTERFACE
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
.
R2
Zo = 50
VDD
Ro
Zo = Ro + Rs
R1
VDD
XTAL_IN
XTAL_OUT
.1uf
Rs
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| ICS83908AGI-02LFT | LOW SKEW, 1-TO-8 CRYSTAL-TO-LVCMOS FANOUT BUFFER |
| ICS83908AGI-02T | LOW SKEW, 1-TO-8 CRYSTAL-TO-LVCMOS FANOUT BUFFER |
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| ICS83908AGI-02LF | 功能描述:IC CLOCK BUFFER MUX 3:8 24-TSSOP RoHS:是 類別:集成電路 (IC) >> 時鐘/計時 - 時鐘緩沖器，驅(qū)動器 系列:HiPerClockS™ 產(chǎn)品培訓模塊:High Bandwidth Product Overview 標準包裝: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，16-MLF? 供應商設備封裝:16-MLF?（3x3） 包裝:帶卷 (TR) |
| ICS83908AGI-02LFT | 功能描述:IC CLOCK BUFFER MUX 3:8 24-TSSOP RoHS:是 類別:集成電路 (IC) >> 時鐘/計時 - 時鐘緩沖器，驅(qū)動器 系列:HiPerClockS™ 標準包裝: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 供應商設備封裝:32-QFN（5x5） 包裝:管件 |
| ICS83908AGI-02T | 制造商:IDT 制造商全稱:Integrated Device Technology 功能描述:LOW SKEW, 1-TO-8 CRYSTAL-TO-LVCMOS FANOUT BUFFER |
| ICS83908I-02 | 制造商:IDT 制造商全稱:Integrated Device Technology 功能描述:LOW SKEW, 1-TO-8 CRYSTAL-TO-LVCMOS FANOUT BUFFER |
| ICS83940 | 制造商:ICS 制造商全稱:ICS 功能描述:LOW SKEW, 1-TO-18 LVCMOS FANOUT BUFFER |
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