ICS8521I-03 Datasheet, PDF (8/15 Pages) Integrated Circuit Systems – LOW SKEW, 1-TO-9 DIFFERENTIAL-TO-LVHSTL FANOUT BUFFER

Integrated
Circuit
Systems, Inc.
ICS8521I-03
LOW SKEW, 1-TO-9
DIFFERENTIAL-TO-LVHSTL FANOUT BUFFER
SCHEMATIC EXAMPLE
This application note provides general design guide using
ICS8521I-03 LVHSTL buffer. Figure 3A shows a schematic ex-
ample of the ICS8521I-03 LVHSTL Clock buffer. In this example,
the input is driven by an LVHSTL driver. CLK_EN is set at logic
low to select CLK0/nCLK0 input.
1.8V
Zo = 50 Ohm
Zo = 50 Ohm
LVHSTL Driv er
R9
50
VDD=3.3V
C5
0.1u
R12 1K
R10
50
R11 1K
VDD=3.3V
VDDO=1.8V
C1
0.1u
U1
1
2 ^VDD
3
4
CLK0
nCLK0
5 ^CLK_SEL
6
7
8
CL:K1
nCLK1
GN D
CLK_EN
ICS8521I-03
C3
0.1u
Zo = 50
VDDO=1.8V
C2
0.1u
Zo = 50
C6
0.1u
+
-
R2
R1
50
50
24
VDDO ₂₃
Q3
nQ3
22
21
Q4 ₂₀
nQ4
Q5
nQ5
VDDO
19
18
17
VDDO=1.8V
C4
0.1u
C7
0.1u
Zo = 50
Zo = 50
+
-
R8
R7
50
50
FIGURE 3A. ICS8521I-03 SCHEMATIC EXAMPLE
8521AYI-03
www.icst.com/products/hiperclocks.html
8
REV. A APRIL 29, 2003