DS90CP22MX-8 Datasheet, PDF (8/17 Pages) Texas Instruments – DS90CP22 800 Mbps 2x2 LVDS Crosspoint Switch

DS90CP22
SNLS053E – MARCH 2000 – REVISED APRIL 2013
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COMPATIBILITY WITH LVDS STANDARD
The DS90CP22 is compatible with LVDS and Bus LVDS Interface devices. It is enhanced over standard LVDS
drivers in that it is able to driver lower impedance loads with standard LVDS levels. Standard LVDS drivers
provide 330mV differential output with a 100Ω load. The DS90CP22 provides 365mV with a 75Ω load or 400mV
with 100Ω loads. This extra drive capability is useful in certain multidrop applications.
In backplane multidrop configurations, with closely spaced loads, the effective differential impedance of the line is
reduced. If the mainline has been designed for 100Ω differential impedance, the loading effects may reduce this
to the 70Ω range depending upon spacing and capacitance load. Terminating the line with a 75Ω load is a better
match than with 100Ω and reflections are reduced.
BLOCK DIAGRAM
SEL0
0
0
1
1
SEL1
0
1
0
1
Table 1. Function Table
OUT0
IN0
IN0
IN1
IN1
OUT1
IN0
IN1
IN0
IN1
Mode
1:2 splitter
repeater
switch
1:2 splitter
8
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