ICS853001 Datasheet, PDF (10/16 Pages) Integrated Circuit Systems – 1:1, DIFFERENTIAL LVPECL-TO-2.5V, 3.3V, 5V LVPECL/ECL BUFFER

Integrated
Circuit
Systems, Inc.
ICS853001
1:1, DIFFERENTIAL LVPECL-TO-
2.5V, 3.3V, 5V LVPECL/ECL BUFFER
LVPECL CLOCK INPUT INTERFACE
The PCLK /nPCLK accepts LVPECL, CML, SSTL and other
differential signals. Both V_SWING and V_OH must meet the V_PP
and V_CMR input requirements. Figures 5A to 5F show interface
examples for the HiPerClockS PCLK/nPCLK input driven by
the most common driver types. The input interfaces suggested
here are examples only. If the driver is from another vendor,
use their termination recommendation. Please consult with the
vendor of the driver component to confirm the driver termina-
tion requirements.
3.3V
CML
Zo = 50 Ohm
Zo = 50 Ohm
3.3V
R1
R2
50
50
3.3V
PCLK
nPCLK _HiPerClockS
PCLK/nPCLK
3.3V
Zo = 50 Ohm
3.3V
R1
PCLK
100
nPCLK
Zo = 50 Ohm
HiPerClockS
CML Built-In Pullup
PCLK/nPCLK
FIGURE 5A. HIPERCLOCKS PCLK/nPCLK INPUT DRIVEN
BY AN OPEN COLLECTOR CML DRIVER
FIGURE 5B. HIPERCLOCKS PCLK/nPCLK INPUT DRIVEN
BY A BUILT-IN PULLUP CML DRIVER
3.3V
Zo = 50 Ohm
LVPEC L
Zo = 50 Ohm
3. 3V
R3
R4
125
125
3.3V
PCLK
nPCLK _HiPerClockS
Input
R1
R2
84
84
3.3V
3.3V LVPECL
Zo = 50 Ohm
C1
Zo = 50 Ohm
C2
R5
100 - 200
R6
100 - 200
R1 R2
50 50
3.3V
PCLK
VBB
nPCLK
PC L K / n PC L K
FIGURE 5C. HIPERCLOCKS PCLK/nPCLK INPUT DRIVEN
BY A 3.3V LVPECL DRIVER
FIGURE 5D. HIPERCLOCKS PCLK/nPCLK INPUT DRIVEN
BY A 3.3V LVPECL DRIVER WITH AC COUPLE
2.5V
SSTL
Zo = 60 Ohm
Zo = 60 Ohm
2.5V
R3
R4
120
120
3.3V
PCLK
R1
R2
120
120
nPCLK
HiPerClockS
PCLK/nPCLK
3.3V
LVDS
Zo = 50 Ohm
R5
100
Zo = 50 Ohm
C1
C2
R1 R2
1K 1K
3.3V
PCLK
VBB
nPCLK
PCLK/nPCLK
FIGURE 5E. HIPERCLOCKS PCLK/nPCLK INPUT DRIVEN
BY AN SSTL DRIVER
FIGURE 5F. HIPERCLOCKS PCLK/nPCLK INPUT DRIVEN
BY A 3.3V LVDS DRIVER
853001AG
www.icst.com/products/hiperclocks.html
10
REV. A JANUARY 29, 2005