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MAX4889ETO+

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
MAX4888/MAX4889
t
r
< 5ns
t
f
< 5ns
50%
V
IL
LOGIC
INPUT
V
N_
= V
NO_
OR V
NC_
R
L
COM_
GND
SEL
C
L
INCLUDES FIXTURE AND STRAY CAPACITANCE.
V
OUT
= V
N_ (
R
L
)
R
L
+ R
ON
V
N_
V
IH
t
OFF
0V
NO_
OR NC_
0.9 x V
0UT
0.9 x V
OUT
t
ON
V
OUT
SWITCH
OUTPUT
LOGIC
INPUT
V+
C
L
3.3V
V
OUT
MAX4888/MAX4889
Figure 1. Switching Time
Test Circuits/Timing Diagrams
2.5Gbps PCI Express Passive Switches
_______________________________________________________________________________________ 7
MAX4888/MAX4889
2.5Gbps PCI Express Passive Switches
8 _______________________________________________________________________________________
Test Circuits/Timing Diagrams (continued)
IN+
V+
3.3V
IN-
OUT+
OUT-
V
IN+
V
IN-
V
OUT+
V
OUT-
NO_+ OR
NC_+
NO_- OR
NC_-
SEL
COM_+
COM_-
0V
1.5V
0V
1.5V
0V
1.5V
0V
1.5V
t
PLHX
t
PHLX
t
INRISE
t
OUTRISE
t
OUTFALL
RISE-TIME PROPAGATION DELAY = t
PLHX
OR t
PLHY
FALL-TIME PROPAGATION DELAY = t
PHLX
OR t
PHLY
t
SK1
=
DIFFERENCE IN PROPAGATION DELAY (RISE-FALL)
50%
50%
50%
50%
90%
10% 10%
90%
10% 10%
R
L
R
L
50%
50%
50%
50%
t
INFALL
90%
90%
t
PHLY
t
PLHY
R
S
R
S
MAX4888/MAX4889
BETWEEN TWO LINES ON THE SAME PAIR
BETWEEN ANY TWO PAIRS
t
SK2
= | t
PLHX
- t
PHLY
| OR | t
PHLX
- t
PLHY
|
Figure 2. Propagation Delay and Output Skew
MAX4888/MAX4889
2.5Gbps PCI Express Passive Switches
_______________________________________________________________________________________ 9
Detailed Description
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
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.
Digital Control Input (SEL)
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.
Analog Signal Levels
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.
CAPACITANCE
METER
NC_ or
NO_
COM_
GND
SEL
V
IL
OR V
IH
0.1μF
3.3V
V+
MAX4888/MAX4889
Figure 4. Channel Off-/On-Capacitance
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.
3.3V
V
OUT
V+
SEL
NC_
COM_
NO_
V
IN
MAX4888/MAX4889
OFF-ISOLATION = 20log
V
OUT
V
IN
ON-LOSS = 20log
V
OUT
V
IN
CROSSTALK = 20log
V
OUT
V
IN
NETWORK
ANALYZER
50Ω
50Ω 50Ω
50Ω
MEAS REF
0.1μF
0V OR V+
50Ω
GND
Figure 3. On-Loss, Off-Isolation, and Crosstalk
Test Circuits/Timing Diagrams (continued)
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

MAX4889ETO+

Mfr. #:
Buy MAX4889ETO+
Manufacturer:
Maxim Integrated
Description:
Analog Switch ICs 2.5Gbps PCI Express Passive Switch
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
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