参数资料
型号: ICS853111BYLF
元件分类: 时钟及定时
英文描述: LOW SKEW CLOCK DRIVER, 10 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PQFP32
封装: 7 X 7 MM, 1 MM HEIGHT, LEAD FREE, MS-026, TQFP-32
文件页数: 2/18页
文件大小: 215K
代理商: ICS853111BYLF
853111BY
www.icst.com/products/hiperclocks.html
REV. A JUNE 16, 2005
10
Integrated
Circuit
Systems, Inc.
ICS853111B
LOW SKEW, 1-TO-10
DIFFERENTIAL-TO-2.5V/3.3V LVPECL/ECL FANOUT BUFFER
VCC - 2V
50Ω
RTT
Zo = 50Ω
FOUT
FIN
RTT =
Zo
1
((VOH + VOL) / (VCC – 2)) – 2
3.3V
125Ω
84Ω
Zo = 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
50Ω transmission lines. Matched impedance techniques should
be used to maximize operating frequency and minimize signal
distortion.
Figures 4A and 4B 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.
FIGURE 4B. LVPECL OUTPUT TERMINATION
FIGURE 4A. LVPECL OUTPUT TERMINATION
TERMINATION FOR 3.3V LVPECL OUTPUTS
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ICS853111Y LOW SKEW CLOCK DRIVER, 10 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PQFP32
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