MAX4888A Maxim, MAX4888A Datasheet

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MAX4888A

Manufacturer Part Number
MAX4888A
Description
The MAX4888A/MAX4889A high-speed passive switches route PCI Express® (PCIe) data between two possible destinations
Manufacturer
Maxim
Datasheet

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MAX4888AETI+
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The MAX4888A/MAX4889A high-speed passive switches
route PCI Express
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.
19-0770; Rev 2; 5/09
+ Denotes lead(Pb)-free/RoHS-compliant package.
* EP = Exposed paddle.
††
PCI Express is a registered trademark of PCI-SIG Corp.
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.
MAX4888AETI+
MAX4889AETO+
TOP VIEW
Contact factory if operating at +2.5V or +1.8V.
GND
GND
V+
V+
25
26
27
28
PART
24 23 22 21 20 19 18 17 16 15
1
+
2
*EP
3
________________________________________________________________ Maxim Integrated Products
4
®
MAX4888A
TQFN
(PCIe) data between two possible
5
5.0Gbps PCI Express Passive Switches
General Description
6
7
8
9 10
-40°C to +85°C
-40°C to +85°C
TEMP RANGE
14
13
12
11
*CONNECT EXPOSED PADDLE TO GROUND.
GND
V+
GND
V+
††
. The
GND
GND
V+
V+
39
40
41
42
Ordering Information/Selector Guide
38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22
1
♦ 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
♦ Industry-Compatible Pinout
♦ Lead-Free Packaging
Typical Application Circuit appears at end of data sheet.
+
Layout
2
PIN-PACKAGE
28 TQFN-EP*
42 TQFN-EP*
*EP
3
Desktop Computers
Servers/Storage Area Networks
Laptops
4
5
6
7
MAX4889A
8
TQFN
9 10 11 12 13 14 15 16 17
Pin Configurations
CONFIGURATION
Four Half Lanes
Two Half Lanes
Applications
Features
21
20
19
18
GND
V+
GND
V+
1

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MAX4888A 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. ...

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

... ISO 1.25GHz Figure 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 ...

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 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

... PCI Express Passive Switches V+ MAX4888A COM1+ COM1- COM2+ COM2- SEL GND COM__TO SEL NC__ OFF 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 ...

Page 11

... Common mode below 1V operation requirement. MAX4888A ONE LANE MAX4889A NOTE: ONLY ONE LANE IS SHOWN FOR CLARITY Figure 5. The MAX4888A/MAX4889A Used as a Single-Lane Switch CrossFire is a trademark of ATI Technologies, Inc. SLI is a trademark of NVIDIA Corporation. ______________________________________________________________________________________ As with all Maxim devices, ESD-protection structures ...

Page 12

PCI Express Passive Switches PCIe BUS LANE 0 TX LANE 1 TX LANE 2 TX LANE 3 TX LANE 0 RX LANE 1 RX LANE 2 RX LANE ______________________________________________________________________________________ Typical Application Circuit PCIe GRAPHICS INTERFACE COM1+ ...

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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