MAX4889A

Manufacturer Part NumberMAX4889A
DescriptionThe MAX4888A/MAX4889A high-speed passive switches route PCI Express® (PCIe) data between two possible destinations
ManufacturerMaxim
MAX4889A datasheets

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19-0770; Rev 2; 5/09
5.0Gbps PCI Express Passive Switches
General Description
The MAX4888A/MAX4889A high-speed passive switches
®
route PCI Express
(PCIe) data between two possible
destinations. The MAX4888A is a quad single-pole/dou-
ble-throw (4 x SPDT) switch ideally suited for switching
two half lanes of PCIe data between two destinations. The
MAX4889A is an octal single-pole/double-throw (8 x
SPDT) switch ideal for switching four half lanes of PCIe
data between four destinations. The MAX4888A/
MAX4889A feature a single digital control input (SEL) to
switch signal paths.
The MAX4888A/MAX4889A are fully specified to oper-
ate from a single +3.0V to +3.6V power supply
MAX4888A is available in a 3.5mm x 5.5mm, 28-pin
TQFN package. The MAX4889A 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.
PART
TEMP RANGE
MAX4888AETI+
-40°C to +85°C
MAX4889AETO+
-40°C to +85°C
+ Denotes lead(Pb)-free/RoHS-compliant package.
* EP = Exposed paddle.
††
Contact factory if operating at +2.5V or +1.8V.
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+
MAX4888A
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.
♦ Single +3.0V to +3.6V Power-Supply Voltage
♦ Low Same-Pair Skew of 7ps
♦ Low 120µA (Max) Quiescent Current
♦ Supports PCIe Gen I and Gen || Data Rates
♦ Flow-Through Pin Configuration for Ease of
Layout
♦ Industry-Compatible Pinout
♦ Lead-Free Packaging
††
. The
Desktop Computers
Servers/Storage Area Networks
Laptops
Ordering Information/Selector Guide
PIN-PACKAGE
28 TQFN-EP*
42 TQFN-EP*
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
V+
40
13
V+
GND
41
12
GND
*EP
V+
42
11
V+
+
1
2
3
4
*CONNECT EXPOSED PADDLE TO GROUND.
Features
Applications
CONFIGURATION
Two Half Lanes
Four Half Lanes
Pin Configurations
21
20
MAX4889A
19
18
5
6
7
8
9 10 11 12 13 14 15 16 17
TQFN
GND
V+
GND
V+
1

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MAX4889A Summary of contents

  • Page 1

    ... The MAX4888A/MAX4889A are fully specified to oper- ate from a single +3.0V to +3.6V power supply MAX4888A is available in a 3.5mm x 5.5mm, 28-pin TQFN package. The MAX4889A 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. PART ...

  • 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

    ... Figure 4 Figure HYST SEL V+ MAX4888A SEL MAX4889A SEL Human Body Model = +85°C. Limits over the operating temperature range are guaranteed by design A = +25°C.) (Note 2) A MIN TYP MAX UNITS 90 250 ns 10 ...

  • Page 4

    ... T = +85° +25° -40° -0.1 0 0.1 0.2 0.3 0.4 0.5 0.6 V (V) COM_ SUPPLY CURRENT vs. TEMPERATURE (MAX4889A +3. +2. +1.8V 0 -40 - TEMPERATURE (°C) TURN-ON/-OFF TIME vs. SUPPLY VOLTAGE 240 220 200 180 NO_ t ON 160 140 ...

  • Page 5

    PCI Express Passive Switches (T = +25°C, unless otherwise noted.) A EYE DIAGRAM (V+ = +1.8V 1.25GHz, 600mV PRBS SIGNAL 50Ω) P COM_+ 50mV/div V COM_- 50ps/div *PRBS = PSEUDORANDOM ...

  • Page 6

    ... PCI Express Passive Switches PIN NAME MAX4888A MAX4889A 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 MAX4888A/MAX4889A +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 MAX4888A/MAX4889A 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 MAX4888A/MAX4889A high-speed passive switch- es route PCIe data between two possible destinations. The MAX4888A/MAX4889A are ideal for routing PCIe sig- nals to change the system configuration. For example graphics application, the MAX4888A/MAX4889A create _______________________________________________________________________________________ Test Circuits/Timing Diagrams (continued) ...

  • Page 10

    ... Functional Diagrams/Truth Table NC1+ COM1+ NC1- COM1- NO1+ NO1- NC2+ COM2+ COM2- NC2- NO2+ NO2- COM3+ COM3- COM__TO COM4+ NO__ COM4- OFF ON SEL V+ MAX4889A NC1+ NC1- NO1+ NO1- NC2+ NC2- NO2+ NO2- NC3+ NC3- NO3+ NO3- NC4+ NC4- NO4+ NO4- GND ...

  • Page 11

    ... ESD of ±6kV without damage. The ESD structures withstand ±6kV of ESD in all states: nor- mal operation, state output mode, and powered down. The MAX4889A COM_+ and COM_- pins are character- ized for ±6kV ESD protection using the Human Body Model (MIL-STD-883, Method 3015). Figure 6 shows ...

  • Page 12

    ... COM4+ NC4+ COM4- NC4- NO1+ NO1- NO2+ NO2- NO3+ NO3- NO4+ NO4- SEL CHANNEL SELECT COM1+ NC1+ COM1- NC1- COM2+ NC2+ MAX4889A 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 For the latest package outline information and land patterns www.maxim-ic.com/packages. PACKAGE TYPE 28 TQFN-EP 42 TQFN-EP ______________________________________________________________________________________ Package Information PACKAGE CODE T283555-1 T423590M-1 DOCUMENT NO. 21-0184 21-0181 13 ...

  • Page 14

    ... Updated voltage range, style edits. Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 14 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © ...

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