MAX4889

Manufacturer Part NumberMAX4889
DescriptionThe MAX4888/MAX4889 high-speed passive switches route PCI Express® (PCIe) data between two possible destinations
ManufacturerMaxim
MAX4889 datasheets

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19-0724; Rev 0; 5/07
2.5Gbps PCI Express Passive Switches
General Description
The MAX4888/MAX4889 high-speed passive switches
®
route PCI Express
(PCIe) data between two possible
destinations. The MAX4888 is a quad single-pole/double-
throw (4 x SPDT) switch ideally suited for switching two
half lanes of PCIe data between two destinations. The
MAX4889 is an octal single-pole/double-throw (8 x SPDT)
switch ideal for switching four half lanes of PCIe data
between four destinations. The MAX4888/MAX4889 fea-
ture 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 is available
in a 3.5mm x 5.5mm, 28-pin TQFN package. The
MAX4889 is available in a 3.5mm x 9.0mm, 42-pin TQFN
package. Both devices operate over the -40°C to +85°C
temperature range.
Desktop Computers
Servers/Storage Area Networks
Laptops
PCI Express is a registered trademark of PCI-Sig Corp.
TOP VIEW
24 23 22 21 20 19 18 17 16 15
25
GND
26
V+
MAX4888
GND
27
*EP
V+
28
+
1
2
3
4
5
6
7
8
9 10
TQFN
________________________________________________________________ Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim's website at www.maxim-ic.com.
o Single 1.65V to 3.6V Power-Supply Voltage
o Low Same-Pair Skew of 7ps
o Low 120µA (Max) Quiescent Current
o Supports PCIe Gen I Data Rates
o Flow-Through Pin Configuration for Ease of
Layout
o Industry-Compatible Pinout
o Lead-Free Packaging
PART
Applications
MAX4888ETI+ 28 TQFN-EP*
MAX4889ETO+ 42 TQFN-EP*
Note: All devices are specified over the -40°C to +85°C operat-
ing temperature range.
+ Denotes lead-free package.
* EP = Exposed paddle.
Typical Application Circuit appears at end of data sheet.
38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22
39
14
GND
GND
40
V+
13
V+
GND
41
12
GND
*EP
V+
42
11
V+
+
1
2
3
*CONNECT EXPOSED PADDLE TO GROUND.
Features
Ordering Information/
Selector Guide
PIN-
CONFIGURATION
PACKAGE
Two
Half Lanes
Four Half
Lanes
Pin Configurations
MAX4889
4
5
6
7
8
9 10 11 12 13 14 15 16 17
TQFN
PKG
CODE
T283555-1
T423590M-1
21
GND
20
V+
19
GND
18
V+
1

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MAX4889 Summary of contents

  • Page 1

    ... 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 is available in a 3.5mm x 5.5mm, 28-pin TQFN package. The MAX4889 is available in a 3.5mm x 9.0mm, 42-pin TQFN package. Both devices operate over the -40°C to +85°C temperature range. Desktop Computers ...

  • Page 2

    ... Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability ...

  • Page 3

    ... 1.25GHz Figure 3 Figure 4 Figure HYST SEL V+ MAX4888 SEL MAX4889 = +85°C. Limits over the operating temperature range are guaranteed by design +25°C.) (Note 2) A MIN TYP MAX UNITS 90 250 ...

  • Page 4

    PCI Express Passive Switches (T = +25°C, unless otherwise noted.) A ON-RESISTANCE vs. V COM 10 1.8V 9.5 9.0 8 2.5V 8.0 7.5 7.0 6 3.3V 6.0 5.5 5.0 -0.1 0.1 0.3 0.5 ...

  • Page 5

    PCI Express Passive Switches (T = +25°C, unless otherwise noted.) A LOGIC THRESHOLD vs. SUPPLY VOLTAGE 1.2 1.1 1 0.9 0 0.7 0.6 0.5 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6 ...

  • Page 6

    ... PCI Express Passive Switches PIN NAME MAX4888 MAX4889 1, 10, 12, 14 10, 14, 17, GND 20, 25, 27 19, 21, 39 SEL 3, 9 — N. COM1 COM1 COM2 COM2 13, 18, 8, 11, 13, 19, 20, 30, V+ 26 NO2 NO2 ...

  • Page 7

    ... PCI Express Passive Switches MAX4888/MAX4889 3.3V NO_ NC_ SEL GND LOGIC INPUT C INCLUDES FIXTURE AND STRAY CAPACITANCE OUT NO_ NC_ Figure 1. Switching Time _______________________________________________________________________________________ Test Circuits/Timing Diagrams LOGIC V+ INPUT COM_ V OUT SWITCH OUTPUT t r < ...

  • Page 8

    ... PCI Express Passive Switches MAX4888/MAX4889 NO_ NC_+ IN+ NO_ NC_- IN- 1.5V V IN+ 50% 0V 1.5V V 50% IN PLHX 1.5V V OUT+ 50% 0V 1.5V 50% V OUT PHLY Figure 2. Propagation Delay and Output Skew 8 _______________________________________________________________________________________ Test Circuits/Timing Diagrams (continued) 3.3V V+ COM_+ OUT COM_- OUT SEL ...

  • Page 9

    ... Figure 4. Channel Off-/On-Capacitance 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 graphics application, the MAX4888/MAX4889 create two _______________________________________________________________________________________ Test Circuits/Timing Diagrams (continued) ...

  • Page 10

    ... Functional Diagrams/Truth Table NC1+ COM1+ NC1- COM1- NO1+ NO1- NC2+ COM2+ NC2- COM2- NO2+ NO2- COM3+ COM3- COM__ TO COM4+ NO__ COM4- OFF ON SEL V+ MAX4889 NC1+ NC1- NO1+ NO1- NC2+ NC2- NO2+ NO2- NC3+ NC3- NO3+ NO3- NC4+ NC4- NO4+ NO4- GND ...

  • Page 11

    ... CrossFire is a trademark of ATI Technologies, Inc. SLI is a trademark of NVIDIA Corporation. ______________________________________________________________________________________ PCIe Switching ONE LANE NOTE: ONLY ONE LANE IS SHOWN FOR CLARITY Board Layout Figure 5. The MAX4888/MAX4889 Used as a Single-Lane Switch PROCESS: CMOS DATA DIRECTION MAX4888 MAX4889 DATA IS ROUTED ...

  • Page 12

    ... COM4+ NC4+ COM4- NC4- NO1+ NO1- NO2+ NO2- NO3+ NO3- NO4+ NO4- SEL CHANNEL SELECT COM1+ NC1+ COM1- NC1- COM2+ NC2+ MAX4889 COM2- NC2- COM3+ NC3+ COM3- NC3- COM4+ NC4+ COM4- NC4- NO1+ NO1- NO2+ NO2- NO3+ NO3- NO4+ NO4- SEL ...

  • Page 13

    ... PCI Express Passive Switches (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.) ______________________________________________________________________________________ Package Information ° 13 ...

  • Page 14

    ... PCI Express Passive Switches (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.) 14 ______________________________________________________________________________________ Package Information (continued) ...

  • Page 15

    ... PCI Express Passive Switches (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.) ______________________________________________________________________________________ Package Information (continued) ° 15 ...

  • Page 16

    ... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied ...

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