參數(shù)資料
型號(hào): ICS853052AM
廠商: INTEGRATED DEVICE TECHNOLOGY INC
元件分類: 編、解碼器及復(fù)用、解復(fù)用
英文描述: 85305 SERIES, 2 LINE TO 1 LINE MULTIPLEXER, COMPLEMENTARY OUTPUT, PDSO8
封裝: 3.90 X 4.90 MM, 1.37 MM HEIGHT, MS-012, SOIC-8
文件頁數(shù): 13/14頁
文件大小: 251K
代理商: ICS853052AM
IDT / ICS 2.5V, 3.3V, 5V LVPECL MULTIPLEXER
8
ICS853052AG REV. B JANUARY 16, 2008
ICS853052
DUAL LVCMOS/LVTTL-TO-DIFFERENTIAL 2.5V, 3.3V, 5V LVPECL MULTIPLEXER
PRELIMINARY
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 dis-
tortion.
Figures 2A and 2B show two different layouts which are
recommended only as guidelines. Other suitable clock layouts
may exist and it would be recommended that the board design-
ers simulate to guarantee compatibility across all printed circuit
and clock component process variations.
TERMINATION FOR 3.3V LVPECL OUTPUTS
FIGURE 2B. LVPECL OUTPUT TERMINATION
FIGURE 2A. LVPECL OUTPUT TERMINATION
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
TERMINATION FOR 5V LVPECL OUTPUT
This section shows examples of 5V LVPECL output termination.
Figure 3A shows standard termination for 5V LVPECL. The
termination requires matched load of 50
resistors pull down to
Zo = 50 Ohm
R2
50
Zo = 50 Ohm
5V
3V
PECL
+
-
R1
50
5V
PECL
R4
84
5V
Zo = 50 Ohm
R3
84
R2
125
5V
PECL
+
-
Zo = 50 Ohm
R1
125
FIGURE 3A. STANDARD 5V LVPECL OUTPUT TERMINATION
FIGURE 3B. 5V LVPECL OUTPUT TERMINATION EXAMPLE
V
CC
- 2V = 3V at the receiver.
Figure 3B shows Thevenin
equivalence of Figure 3A. In actual application where the 3V DC
power supply is not available, this approached is normally used.
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