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| ICS848004I Datasheet, PDF (8/11 Pages) Integrated Circuit Systems – FEMTOCLOCKS™ CRYSTAL-TO-SSTL_2 FREQUENCY SYNTHESIZER | |||
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Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS848004I
FEMTOCLOCKS⢠CRYSTAL-TO-
SSTL_2 FREQUENCY SYNTHESIZER
SSTL INTERFACE
Figures 3A to 3C show interface example of ICS848004I
SOCKET/nSOCKET input driven by an SSTL driver. The input
interfaces suggested here are examples only. Please consult
with the vendor of the driver component to confirm the driver
termination requirements.The SSTL termination shown in these
examples are also suitable for ICS48004I SSTL output drivers.
2.5V
SSTL
Zo = 60 Ohm
Zo = 60 Ohm
1.25V
R1
R2
60
60
2.5V
SOCKET_CLK
nSOCKET_CLK
2.5V
SSTL
Zo = 60 Ohm
Zo = 60 Ohm
2.5V
R3
R4
120
120
SOCKET_CLK
nSOCKET_CLK
R1
R2
120
120
FIGURE
3A. TYPICAL
SSTL
INTERFACE
FOR
V /2
DD
=
1.25V
BEING AVAILABLE
FIGURE 3B. SSTL INTERFACE FOR VDD/2 = 1.25V
WITH NO AVAILABLE
2.5V
SSTL
Zo = 60 Ohm
R1 25
R3
Zo = 60 Ohm
120
R2 25
2.5V
SOCKET_CLK
nSOCKET_CLK
FIGURE 3C. DIFFERENTIAL SSTL INTERFACE
848004AGI
www.icst.com/products/hiperclocks.html
8
REV. A AUGUST 18, 2005
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