参数资料
型号: ICS873032AG
元件分类: 时钟及定时
英文描述: 873032 SERIES, LOW SKEW CLOCK DRIVER, 1 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PDSO8
封装: 3 X 3 MM, 0.95 MM HEIGHT, MO-187, TSSOP-8
文件页数: 12/14页
文件大小: 683K
代理商: ICS873032AG
873032AM
www.icst.com/products/hiperclocks.html
REV. A SEPTEMBER 26, 2005
7
Integrated
Circuit
Systems, Inc.
ICS873032
HIGH SPEED, ÷2 DIFFERENTIAL-TO-
3.3V, 5V LVPECL/ECL CLOCK GENERATOR
PRELIMINARY
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
APPLICATION INFORMATION
FIGURE 2. SINGLE ENDED SIGNAL DRIVING DIFFERENTIAL INPUT
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 3A and 3B 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 3.3V LVPECL OUTPUTS
FIGURE 3B. LVPECL OUTPUT TERMINATION
FIGURE 3A. LVPECL OUTPUT TERMINATION
WIRING THE DIFFERENTIAL INPUT TO ACCEPT SINGLE ENDED LEVELS
Figure 2 shows an example of the differential input that can be
wired to accept single ended levels. The reference voltage level
V
BB generated from the device is connected to the negative
input. The C1 capacitor should be located as close as possible
to the input pin.
PCLK
nPCLK
VBB
C1
0.1u
CLK_IN
VCC
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