ICS853111 Datasheet, PDF (11/13 Pages) Integrated Circuit Systems – LOW SKEW, 1-TO-10 DIFFERENTIAL-TO-2.5V/3.3V LVPECL/ECL FANOUT BUFFER

Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS853111
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
ICS853111 LVPECL buffer. Figure 6 shows a schematic ex-
ample of the ICS853111 LVPECL clock buffer. In this example,
the input is driven by an LVPECL driver. CLK_SEL is set at logic
high to select PCLK0/nPCLK0 input.
Zo = 50
+
Zo = 50
-
VCC
R2
R1
50
50
VCC
C6 (Option)
R3
0.1u
50
Zo = 50 Ohm
Zo = 50 Ohm
3.3V LVPECL
R9
50
C8 (Option)
0.1u
R4
1K
R10
50
R11
50
1
2
3
4
VCC
CLK_SEL
PCLK0
5 ^nPCLK0
6 ^VBB
7
8
PCLK1
nPCLK1
VEE
VCC
VCC=3.3V
(U1-9)
(U1-16)
VCC
(U1-25) (U1-32) (U1-1)
C1
0.1uF
C2
0.1uF
C3
0.1uF
C4
0.1uF
C5
0.1uF
Q3
nQ3
Q4
24
23
22
21
nQ4 ₂₀
Q5 ₁₉
nQ5
Q6
nQ6
18
17
U1
ICS853111
Zo = 50
Zo = 50
+
-
R8
R7
50
50
C7 (Option)
0.1u
R13
50
FIGURE 6. EXAMPLE ICS853111 LVPECL CLOCK OUTPUT BUFFER SCHEMATIC
RELIABILITY INFORMATION
TABLE 6. θ_JAVS. AIR FLOW TABLE
q by Velocity (Linear Feet per Minute)
JA
Single-Layer PCB, JEDEC Standard Test Boards
Multi-Layer PCB, JEDEC Standard Test Boards
0
67.8°C/W
47.9°C/W
200
55.9°C/W
42.1°C/W
500
50.1°C/W
39.4°C/W
NOTE: Most modern PCB designs use multi-layered boards. The data in the second row pertains to most designs.
TRANSISTOR COUNT
The transistor count for ICS853111 is: 1340
8 5 3 111 AY
www.icst.com/products/hiperclocks.html
11
REV. D JULY 22, 2003