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 and also
operate down to +1.65V. The 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.
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.
