19-0724; Rev 0; 5/07
2.5Gbps PCI Express Passive Switches
/MAX489
General Description
Features
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.
♦ Single 1.65V to 3.6V Power-Supply Voltage
♦ Low Same-Pair Skew of 7ps
♦ Low 120µA (Max) Quiescent Current
♦ Supports PCIe Gen I Data Rates
♦ Flow-Through Pin Configuration for Ease of
Layout
♦ Industry-Compatible Pinout
♦ Lead-Free Packaging
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.
Ordering Information/
Selector Guide
PIN-
PACKAGE
PKG
PART
CONFIGURATION
CODE
Applications
Two
Half Lanes
Desktop Computers
Servers/Storage Area Networks
Laptops
MAX4888ETI+ 28 TQFN-EP*
MAX4889ETO+ 42 TQFN-EP*
T283555-1
Four Half
Lanes
T423590M-1
Note: All devices are specified over the -40°C to +85°C operat-
ing temperature range.
+Denotes lead-free package.
*EP = Exposed paddle.
PCI Express is a registered trademark of PCI-Sig Corp.
Typical Application Circuit appears at end of data sheet.
Pin Configurations
TOP VIEW
38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22
24 23 22 21 20 19 18 17 16 15
39
21 GND
20 V+
25
26
14 GND
13 V+
GND
V+
GND
V+
40
MAX4888
GND 41
V+ 42
MAX4889
19 GND
18 V+
GND 27
V+ 28
12 GND
11 V+
*EP
*EP
+
+
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16 17
1
2
3
4
5
6
7
8
9
10
TQFN
TQFN
*CONNECT EXPOSED PADDLE TO GROUND.
________________________________________________________________ Maxim Integrated Products
1
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.