参数资料
型号: ICS853111BYLF
元件分类: 时钟及定时
英文描述: LOW SKEW CLOCK DRIVER, 10 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PQFP32
封装: 7 X 7 MM, 1 MM HEIGHT, LEAD FREE, MS-026, TQFP-32
文件页数: 4/18页
文件大小: 215K
代理商: ICS853111BYLF
853111BY
www.icst.com/products/hiperclocks.html
REV. A JUNE 16, 2005
12
Integrated
Circuit
Systems, Inc.
ICS853111B
LOW SKEW, 1-TO-10
DIFFERENTIAL-TO-2.5V/3.3V LVPECL/ECL FANOUT BUFFER
SCHEMATIC EXAMPLE
This application note provides general design guide using
ICS853111B LVPECL buffer. Figure 6 shows a schematic ex-
ample of the ICS853111B LVPECL clock buffer. In this example,
FIGURE 6. EXAMPLE ICS853111B LVPECL CLOCK OUTPUT BUFFER SCHEMATIC
the input is driven by an LVPECL driver. CLK_SEL is set at logic
high to select PCLK0/nPCLK0 input.
C4
0.1uF
C6 (Option)
0.1u
Zo = 50
R7
50
Zo = 50
R2
50
VCC
R1
50
VCC
VCC=3.3V
C7 (Option)
0.1u
R3
50
(U1-16)
U1
ICS853111
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
VCC
CLK_SEL
PCLK0
nPCLK0
VBB
PCLK1
nPCLK1
VEE
VC
C
O
nQ
9
Q9
nQ
8
Q8
nQ
7
Q7
VC
C
O
nQ6
Q6
nQ5
Q5
nQ4
Q4
nQ3
Q3
VC
C
O
Q0
nQ
0
Q1
nQ
1
Q2
nQ
2
VC
C
O
R4
1K
Zo = 50
C2
0.1uF
(U1-9)
R8
50
Zo = 50 Ohm
C8 (Option)
0.1u
+
-
C5
0.1uF
R10
50
R11
50
3.3V LVPECL
+
-
VCC
(U1-32)
R13
50
C1
0.1uF
Zo = 50 Ohm
R9
50
C3
0.1uF
(U1-25)
VCC
Zo = 50
(U1-1)
EXPOSED PAD
Expose Metal Pad
(GROUND PAD)
GROUND PLANE
SOLDER
SIGNAL
TRACE
SIGNAL
TRACE
THERMAL VIA
SOLDER MASK
FIGURE 7. P.C. BOARD FOR EXPOSED PAD THERMAL RELEASE PATH EXAMPLE
THERMAL RELEASE PATH
The expose metal pad provides heat transfer from the device to
the P.C. board. The expose metal pad is ground pad connected
to ground plane through thermal via. The exposed pad on the
device to the exposed metal pad on the PCB is contacted through
solder as shown in
Figure 7. For further information, please re-
fer to the Application Note on Surface Mount Assembly of
Amkor’s Thermally /Electrically Enhance Leadframe Base Pack-
age, Amkor Technology.
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