参数资料
型号: ICS854S204AGILF
厂商: INTEGRATED DEVICE TECHNOLOGY INC
元件分类: 时钟及定时
英文描述: 854 SERIES, LOW SKEW CLOCK DRIVER, 2 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PDSO16
封装: 4.40 X 5 MM, 0.92 MM PITCH, ROHS COMPLIANT, MO-153, TSSOP-16
文件页数: 3/16页
文件大小: 3231K
代理商: ICS854S204AGILF
IDT / ICS LVDS, LVPECL FANOUT BUFFER
11
ICS854S204AGI REV A AUGUST 14, 2006
ICS854S204I
LOW SKEW, DUAL, 1-TO-2 DIFFERENTIAL-TO-LVDS, LVPECL FANOUT BUFFER
PRELIMINARY
3.3V, 2.5V LVDS DRIVER TERMINATION
A general LVDS interface is shown in
Figure 3. In a 100
differential transmission line environment, LVDS drivers
require a matched load termination of 100
across near
FIGURE 3. TYPICAL LVDS DRIVER TERMINATION
the receiver input. For a multiple LVDS outputs buffer, if only partial
outputs are used, it is recommended to ter minate the
unused outputs.
2.5V or 3.3V
+
-
VDD
100 Ohm Differential Transmission Line
R1
100
LVDS_Driv er
V
CC - 2V
50
50
RTT
Z
o = 50
Z
o = 50
FOUT
FIN
RTT =
Z
o
1
((V
OH + VOL) / (VCC – 2)) – 2
3.3V
125
125
84
84
Z
o = 50
Z
o = 50
FOUT
FIN
The clock layout topology shown below is a typical termination
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
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.
TERMINATION FOR 3.3V LVPECL OUTPUTS
FIGURE 4B. LVPECL OUTPUT TERMINATION
FIGURE 4A. LVPECL OUTPUT TERMINATION
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