Maxim MAX4888A - Manual
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Table of Contents:
- Page 2 – Gbps PCI Express Passive Switches; ABSOLUTE MAXIMUM RATINGS
- Page 4 – Typical Operating Characteristics
- Page 5 – Typical Operating Characteristics (continued)
- Page 6 – Pin Description
- Page 7 – Test Circuits/Timing Diagrams
- Page 9 – Detailed Description; Analog Signal Levels
- Page 10 – Functional Diagrams/Truth Table
- Page 11 – Applications Information; PCIe Switching; Chip Information
- Page 12 – Typical Application Circuit
- Page 13 – Package Information
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
d a t a b e t w e e n f o u r d e s t i n a t i o n s . T h e M A X 4 8 8 8 A /
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 and also
operate down to +1.65V. The MAX4888A is available
i n a 3 . 5 m m x 5 . 5 m m , 2 8 - p i n T Q F N p a c k a g e . T h e
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.
Applications
Desktop Computers
Servers/Storage Area Networks
Laptops
Features
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 and Gen || Data Rates
o
Flow-Through Pin Configuration for Ease of
Layout
o
Industry-Compatible Pinout
o
Lead-Free Packaging
MAX4888A/MAX4889A
5.0Gbps PCI Express Passive Switches
________________________________________________________________
Maxim Integrated Products
1
MAX4888A
TOP VIEW
TQFN
11
12
13
14
V+
GND
*EP
V+
GND
28
+
27
26
25
V+
GND
V+
GND
1
2
3
4
5
6
7
8
9
10
24 23 22 21 20 19 18 17 16 15
GND
N.C.
V+
COM2-
COM2+
COM1-
COM1+
N.C.
SEL
GND
NO2-
NO2+
NO1-
NO1+
V+
GND
NC2-
NC2+
NC1-
NC1+
MAX4889A
TQFN
18
19
20
21
V+
GND
V+
GND
42
+
41
40
39
V+
GND
V+
GND
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16 17
38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22
COM3-
V+
GND
COM4+
COM4-
GND
COM3+
GND
SEL
V+
COM2-
COM2+
V+
GND
COM1-
COM1+
GND
NC4+
NC4-
NO3+
NO3-
NO4+
NO4-
NC3-
NC3+
V+
NO2-
NO2+
NO1-
NO1+
NC2-
NC2+
NC1-
NC1+
*CONNECT EXPOSED PADDLE TO GROUND.
*EP
Pin Configurations
Ordering Information/
Selector Guide
19-0770; Rev 0; 4/07
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.
Note:
All devices are specified over the -40°C to +85°C operat-
ing temperature range.
+
Denotes lead-free package.
*
EP = Exposed paddle.
PART
PIN-
PACKAGE
CONFIGURATION
PKG
CODE
MAX4888A
ETI+ 28 TQFN-EP*
Two
Half Lanes
T283555-1
M A X4 8 8 9 A
E TO + 42 TQFN-EP*
Four Half
Lanes
T423590M-1
Typical Application Circuit appears at end of data sheet.
PCI Express is a registered trademark of PCI-Sig Corp.
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Summary
MAX4888A/MAX4889A 5.0Gbps PCI Express Passive Switches 2 _______________________________________________________________________________________ ABSOLUTE MAXIMUM RATINGS ELECTRICAL CHARACTERISTICS (V+ = 3.0V to 3.6V, T A = -40°C to +85°C, unless otherwise noted. Typical values are at V+ = 3.3V, T A ...
MAX4888A/MAX4889A 5.0Gbps PCI Express Passive Switches 4 _______________________________________________________________________________________ Typical Operating Characteristics (T A = +25°C, unless otherwise noted.) ON-RESISTANCE vs. V COM V COM (V) R ON ( Ω ) MAX4888A/89A toc01 -0.1 0.1 0.3 0.5 0...
MAX4888A/MAX4889A 5.0Gbps PCI Express Passive Switches _______________________________________________________________________________________ 5 Typical Operating Characteristics (continued) (T A = +25°C, unless otherwise noted.) EYE DIAGRAM (V+ = 3.3V, f = 1.25GHz, 600mV P-P PRBS SIGNAL, R S = R L ...
