ICS843N252-45 Datasheet, PDF (9/16 Pages) Integrated Device Technology – Fourth generation FemtoClock

ICS843N252-45 Data Sheet
FEMTOCLOCK^® CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER
R1
33
QA
Zo = 50 Ohm
U1
CLK_EN_B
VCCO
0.1u C6
CLK_EN_A
VCC
1
2
3
4
CLK_EN_A
VEE
QA
5 ^VCCOA
6
7
8
nc
nc
VCCA
VCC
CLK_EN_B
VEE
QB
16
15
14
13
nQB ₁₂
VCC
XTAL_IN
XTAL_OUT
11
10
9
VEE
VCC
0.1u C7
R4
VCC
10
VCCA
C3
0.1u
C4
0.1u
C5
10u
C1
5pF
LVCMOS
Zo = 50 Ohm
QB
Zo = 50 Ohm
nQB
VCC=3.3V
VCCOA=3.3V
3.3V
R2
R3
133
133
+
-
R5
R6
82.5 82.5
Logic Input Pin Examples
Set Logic
Set Logic
VCC _{Input to} VCC _{Input to}
'1'
'0'
RU1
RU2
1K
Not Install
To Logic
Input
pins
RD1
Not Install
To Logic
Input
pins
RD2
1K
3.3V
BLM18BB221SN2
1
2
VCC
Ferrite Bead C10
C9
0.1uF
10uF
3.3V
BLM18BB221SN2
1
2
VCCO
Ferrite Bead C15
C14
0.1uF
10uF
X1 25MHz
12pF
QB
C2
5pF
nQB
Zo = 50 Ohm
Zo = 50 Ohm
Optional
LVPECL
Y-Termination
+
-
R7
R8
50
50
R9
50
Figure 3. ICS843N252-45 Schematic Example
ICS843N252GG-45 REVISION A JULY 6, 2011
9
©2011 Integrated Device Technology, Inc.