ICS853031 Datasheet, PDF (13/19 Pages) Integrated Circuit Systems – LOW SKEW, 1-TO-9 DIFFERENTIAL-TO-2.5V/3.3V LVPECL/ECL FANOUT BUFFER

Integrated
Circuit
Systems, Inc.
ICS853031
LOW SKEW, 1-TO-9
DIFFERENTIAL-TO-2.5V/3.3V LVPECL/ECL FANOUT BUFFER
APPLICATION SCHEMATIC EXAMPLE
Figure 7 shows an example of ICS853031 application schematic.
In this example, the device is operated at V_CC=3.3V. The
decoupling capacitor should be located as close as possible to
the power pin. The input is driven by a 3.3V LVPECL driver. Only
two terminations examples are shown in this schematic. For
more termination approaches, please refer to the LVPECL Ter-
mination Application Note.
VCC = 3.3V
R11
50
C7
0.1uF
VCC = 3.3V
VCCO = 3.3V
3.3V
Zo = 50 Ohm
Zo = 50 Ohm
LVPECL
CLK_SEL
R8
R9
50
50
R10
50
1
2
VCC
3 ^CLK
4 ^nCLK
5
6
7
8
CLK_SEL
PCLK
nPCLK
VEE
CLK_EN
U1
ICS853031
VCCO
24
23
Q3 ₂₂
nQ3 ₂₁
Q4
nQ4
Q5
nQ5
VCCO
20
19
18
17
(U1-9)
(U1-16) (U1-17) (U1-24) (U1-25) (U1-32)
VCCO
C1
0.1uF
C2
0.1uF
C3
0.1uF
C4
0.1uF
C5
0.1uF
C6
0.1uF
VCCO = 3.3V
R1
133
Zo = 50 Ohm
Q0
R3
133
+
Zo = 50 Ohm
nQ0
-
R2
82.5
R4
82.5
Zo = 50 Ohm
Q8
+
Zo = 50 Ohm
nQ8
R5
50
-
R6
50
Optional
R7
50
Y-Termination
FIGURE 7. ICS853031 SCHEMATIC EXAMPLE
853031AY
www.icst.com/products/hiperclocks.html
13
REV. B SEPTEMBER 16, 2004