L
參數資料
型號: ICS8535AG-31LFT
廠商: IDT, Integrated Device Technology Inc
文件頁數: 14/15頁
文件大小: 0K
描述: IC CLOCK BUFFER MUX 2:4 20-TSSOP
標準包裝: 2,500
系列: HiPerClockS™
類型: 扇出緩沖器(分配),多路復用器
電路數: 1
比率 - 輸入:輸出: 2:4
差分 - 輸入:輸出: 無/是
輸入: LVCMOS,LVTTL,晶體
輸出: LVPECL
頻率 - 最大: 266MHz
電源電壓: 3.135 V ~ 3.465 V
工作溫度: 0°C ~ 70°C
安裝類型: 表面貼裝
封裝/外殼: 20-TSSOP(0.173",4.40mm 寬)
供應商設備封裝: 20-TSSOP
包裝: 帶卷 (TR)
其它名稱: 8535AG-31LFT
8535AG-31
www.icst.com/products/hiperclocks.html
REV. B APRIL 29, 2005
8
Integrated
Circuit
Systems, Inc.
ICS8535-31
LOW SKEW, 1-TO-4, CRYSTAL OSCILLATOR/
LVCMOS-TO-3.3V LVPECL FANOUT BUFFER
APPLICATION INFORMATION
V
CC - 2V
50
Ω
50
Ω
RTT
Z
o = 50Ω
Z
o = 50Ω
FOUT
FIN
RTT =
Z
o
1
((V
OH + VOL) / (VCC – 2)) – 2
3.3V
125
Ω
125
Ω
84
Ω
84
Ω
Z
o = 50Ω
Z
o = 50Ω
FOUT
FIN
The clock layout topology shown below is a typical termina-
tion for LVPECL outputs. The two different layouts mentioned
are recommended only as guidelines.
FOUT and nFOUT are low impedance follower outputs that gen-
erate ECL/LVPECL compatible outputs. Therefore, terminating
resistors (DC current path to ground) or current sources must
be used for functionality. These outputs are designed to drive
50
Ω transmission lines. Matched impedance techniques should
be used to maximize operating frequency and minimize signal
distortion.
Figures 2A and 2B show two different layouts which
are recommended only as guidelines. Other suitable clock lay-
outs may exist and it would be recommended that the board
designers simulate to guarantee compatibility across all printed
circuit and clock component process variations.
TERMINATION FOR LVPECL OUTPUTS
FIGURE 2B. LVPECL OUTPUT TERMINATION
FIGURE 2A. LVPECL OUTPUT TERMINATION
Figure 3. CRYSTAL INPUt INTERFACE
CRYSTAL INPUT INTERFACE
The ICS8535-31 has been characterized with 18pF parallel
resonant crystals. The capacitor values, C1 and C2, shown
in
Figure 3 below were determined using an 18pF parallel reso-
nant crystal and were chosen to minimize the ppm error.
These same capacitor values will tune any 18pF parallel reso-
nant crystal over the frequency range and other parameters
specified in this data sheet. The optimum C1 and C2 values
can be slightly adjusted for different board layouts.
C1
18p
X1
18pF Parallel Crystal
C2
22p
XTAL_IN
XTAL_OUT
ICS8535-31
LOW SKEW, 1-TO-4, CRYSTAL OSCILLATOR/ LVCMOS-TO-3.3V LVPECL FANOUT BUFFER
TSD
IDT / ICS LOW SKEW, 1-TO-4, CRYSTAL OSCILLATOR/ LVCMOS-TO-3.3V LVPECL FANOUT BUFFER
ICS8535-31
8
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