ICS8523I Datasheet, PDF (10/16 Pages) Integrated Circuit Systems – LOW SKEW, 1-TO-4 DIFFERENTIAL-TO-HSTL FANOUT BUFFER

Integrated
Circuit
Systems, Inc.
ICS8523I
LOW SKEW, 1-TO-4
DIFFERENTIAL-TO-HSTL FANOUT BUFFER
SCHEMATIC EXAMPLE
Figure 5 shows a schematic example of the ICS8523I. In this
example, the input is driven by an ICS HiPerClockS HSTL driver.
The decoupling capacitors should be physically located near the
power pin. For ICS8523I, the unused clock outputs can be left
floating.
Zo = 50
+
3.3V
1.8V
Zo = 50 Ohm
Zo = 50 Ohm
LVHSTL Driver
R9 R10
50 50
R12
1K
U3
1
2
3
GND
CLK_EN
4
5
6
CLK_SEL
CLK
nCLK
7 ^PCLK
8 ^nPCLK
R11
9 ^NC
1K
3.3V
10
NC
VDD
C1
0.1u 8523
Q0
nQ0
20
19
18
VDDO
Q1
nQ1
17
16
15
Q2 ₁₄
nQ2 ₁₃
VDDO ₁₂
Q3
nQ3
11
1.8V
1.8V
1.8V
C2
C3
0.1u 0.1u
Zo = 50
Zo = 50
Zo = 50
-
R2
R1
50
50
+
-
R4
R3
50
50
Zo = 50
Zo = 50
+
-
R6
R5
50
50
Zo = 50
Zo = 50
+
-
R8
R7
50
50
FIGURE 5. ICS8523I HSTL BUFFER SCHEMATIC EXAMPLE
8523BGI
www.icst.com/products/hiperclocks.html
10
REV. C SEPTEMBER 16, 2004