MAX4889 Maxim, MAX4889 Datasheet - Page 9

• Manufacturer Part Number: MAX4889
• Description: The MAX4888/MAX4889 high-speed passive switches route PCI Express® (PCIe) data between two possible destinations
• Manufacturer: Maxim

Figure 3. On-Loss, Off-Isolation, and Crosstalk
Figure 4. Channel Off-/On-Capacitance
The MAX4888/MAX4889 high-speed passive switches
route PCIe data between two possible destinations. The
MAX4888/MAX4889 are ideal for routing PCIe signals to
change the system configuration. For example, in a
graphics application, the MAX4888/MAX4889 create two
CAPACITANCE
METER
MEASUREMENTS ARE STANDARDIZED AGAINST SHORTS AT IC TERMINALS.
OFF-ISOLATION IS MEASURED BETWEEN COM_ AND "OFF" NO_ OR NC_ TERMINAL ON EACH SWITCH.
ON-LOSS IS MEASURED BETWEEN COM_ AND "ON" NO_ OR NC_ TERMINAL ON EACH SWITCH.
CROSSTALK IS MEASURED BETWEEN ANY TWO PAIRS.
SIGNAL DIRECTION THROUGH SWITCH IS REVERSED; WORST VALUES ARE RECORDED.
50Ω
0V OR V+
SEL
NC_
_______________________________________________________________________________________
0.1μF
2.5Gbps PCI Express Passive Switches
MAX4888/MAX4889
Detailed Description
COM_
NC_ or
NO_
3.3V
GND
V+
GND
3.3V
V+
0.1μF
MAX4888/MAX4889
COM_
NO_
SEL
V
V
IN
OUT
V
Test Circuits/Timing Diagrams (continued)
IL
OR V
IH
MEAS
50Ω
50Ω
sets of eight lanes from a single 16-lane bus. The
MAX4888/MAX4889 feature a single digital control input
(SEL) to switch signal paths.
The MAX4888/MAX4889 are fully specified to operate
from a single 3.0V to 3.6V power supply and also oper-
ate down to 1.65V.
The MAX4888/MAX4889 provide a single digital control
input (SEL) to select the signal path between the
COM__ and NO__/NC__ channels. The truth tables for
the MAX4888/MAX4889 are depicted in the Functional
Diagrams/Truth Table section. Drive SEL rail-to-rail to
minimize power consumption.
The MAX4888/MAX4889 accept standard PCIe signals
to a maximum of V+ - 1.2V. Signals on the COM_+
channels are routed to either the NO_+ or NC_+ chan-
nels, and signals on the COM_- channels are routed to
either the NO_- or NC_- channels. The MAX4888/
MAX4889 are bidirectional switches, allowing COM__,
NO__, and NC__ to be used as either inputs or outputs.
ANALYZER
NETWORK
50Ω
50Ω
REF
Digital Control Input (SEL)
OFF-ISOLATION = 20log
CROSSTALK = 20log
Analog Signal Levels
ON-LOSS = 20log
V
V
V
V
V
V
OUT
OUT
OUT
IN
IN
IN
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