ICS84314 Datasheet, PDF (11/18 Pages) Integrated Circuit Systems – 350MHZ, CRYSTAL-TO-3.3V/2.5V LVPECL FREQUENCY SYNTHESIZER W/FANOUT BUFFER

Integrated
Circuit
Systems, Inc.
ICS84314
350MHZ, CRYSTAL-TO-3.3V/2.5V LVPECL
FREQUENCY SYNTHESIZER W/FANOUT BUFFER
LAYOUT GUIDELINE
The schematic of the ICS84314 layout example used in this layout
guideline is shown in Figure 6A. The ICS84314 recommended PCB
board layout for this example is shown in Figure 6B. This layout
example is used as a general guideline. The layout in the actual
system will depend on the selected component types, the density
of the components, the density of the traces, and the stack up of
the P.C. board.
C1
U3
1
2 ^M4
3
4
M5
M6
5
6
M7
M8
7
8
VEE
VCC
VCCO
C5
0.1u
C4
0.1u
X1
C2
ICS84314
24
TEST_CLK ₂₃
XTAL_SEL
VCCA
22
21
S_LOAD
S_DATA
20
19
S_CLOCK
MR
VCCO
18
17
VCC=3.3V
VCC
VCC
VCCA
C11
0.01u
R7
10
C16
10u
C3
0.1u
Zo = 50 Ohm
Logic Input Pin Examples
Set Logic
VCC _{Input to}
'1'
RU1
1K
To Logic
Input
pins
RD1
Not Install
Set Logic
VCC _{Input to}
'0'
RU2
Not Install
To Logic
Input
pins
RD2
1K
+
Zo = 50 Ohm
-
R2
R1
50
50
C6 (Option)
R3
0.1u
50
Zo = 50 Ohm
Zo = 50 Ohm
+
-
R5
R4
50
50
C7 (Option)
R6
0.1u
50
FIGURE 6A. SCHEMATIC OF 3.3V/3.3V RECOMMENDED LAYOUT
84314AY
www.icst.com/products/hiperclocks.html
11
REV. C JANUARY 27, 2005