
8430AYI-61
www.icst.com/products/hiperclocks.html
REV. C JUNE 2, 2006
13
Integrated
Circuit
Systems, Inc.
ICS8430I-61
500MHZ, CRYSTAL-TO-3.3V, 2.5V DIFFERENTIAL
LVPECL FREQUENCY SYNTHESIZER
The schematic of the ICS8430I-61 layout example used in
this layout guideline is shown in Figure 7A. The ICS8430I-61
recommended PCB board layout for this example is shown
in Figure 7B. This layout example is used as a general guide-
LAYOUT GUIDELINE
FIGURE 7A. SCHEMATIC OF RECOMMENDED LAYOUT
line. 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.
+
-
X1
VCC
To Logic
Input
pins
R1
125
Logic Input Pin Examples
VCC=3.3V
Zo = 50 Ohm
RU2
SP
C1
VCC
Zo = 50 Ohm
R7
10
C15
0.1u
Set Logic
Input to '0'
VCC
C14
0.1u
RU1
1K
U1
ICS8430-61
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
32
31
30
29
28
27
26
25
M5
M6
M7
M8
N0
N1
N2
VEE
T
EST
VC
C
FO
U
T
1
nF
O
U
T
1
VC
C
O
FO
U
T
0
nF
O
U
T
0
VE
E
MR
S_CLOCK
S_DATA
S_LOAD
VCCA
nXTAL_SEL
REF_IN
XTAL_OUT
M4
M3
M2
M1
M0
VC
O_S
EL
nP
_L
OAD
XT
AL
_I
N
R2
84
SP = Spare Pads
RD1
SP
To Logic
Input
pins
RD2
1K
VCC
C2
C11
0.01u
C16
10u
R3
125
VCC
VCCA
Set Logic
Input to '1'
R4
84