Rainbow Electronics MAX4889C User Manual
General description, Applications, Features
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General Description
The MAX4889B/MAX4889C high-speed passive switch-
es route PCI Express
®
(PCIe) data between two possi-
ble destinations in desktop or notebook PCs. The
MAX4889B/MAX4889C are quad double-pole/double-
throw (4 x DPDT) switches ideal for switching four half
lanes of PCIe data between two destinations. The
MAX4889B/MAX4889C feature a single digital control
input (SEL) to switch signal paths.
The MAX4889C is intended for use in systems (e.g.,
SAS) where both the input and output are capacitively
coupled, and provides a 10µA (typ) source current and
a 60kΩ (typ) internal biasing resistor to GND at the
_OUT_ terminals.
The MAX4889B/MAX4889C are fully specified to oper-
ate from a single +3.3V (typ) power supply. Both
devices are available in an industry-standard 3.5mm x
9.0mm, 42-pin TQFN package. These devices operate
over the -40°C to +85°C extended temperature range.
Applications
Desktop PCs
Notebook PCs
Servers
Video Graphics Cards—SLI™
(Scaled Link Interface) and CrossFire™
Features
♦ Single +3.3V Power-Supply Voltage
♦ Support PCIe Gen I, Gen II Data Rates
♦ Supports SAS I, SAS II, and SAS 6.0Gbps
(MAX4889C)
♦ Superior Return Loss
Better than -14dB at 2.8GHz
♦ Small 3.5mm x 9.0mm, 42-Pin TQFN Package
♦ Industry-Standard Pinouts
MAX4889B/MAX4889C
2.5/5.0Gbps PCIe Passive Switches
________________________________________________________________
Maxim Integrated Products
1
Ordering Information
19-4148; Rev 1; 8/08
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 temperature
range.
+
Denotes a lead-free package.
*
EP = Exposed pad.
PART
PIN-PACKAGE
PKG CODE
MAX4889BETO+
42 TQFN-EP*
T423590M-1
MAX4889CETO+
42 TQFN-EP*
T423590M-1
Pin Configuration
TOP VIEW
MAX4889B/
MAX4889C
TQFN
18
19
20
21
GND
V
CC
GND
V
CC
42
+
41
40
39
GND
V
CC
GND
V
CC
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
COUTB+
COUTB-
DIN+
DIN-
DOUTB+
DOUTB-
CIN-
CIN+
V
CC
BOUTB-
BOUTB+
BIN-
BIN+
AOUTB-
AOUTB+
AIN-
AIN+
COUTA-
V
CC
GND
DOUTA+
DOUTA-
GND
COUTA+
GND
SEL
V
CC
BOUTA-
BOUTA+
V
CC
GND
AOUTA-
AOUTA+
GND
*CONNECT EXPOSED PAD TO GROUND.
*EP
PCI Express is a registered trademark of PCI-SIG Corp.
SLI is a trademark of NVIDIA Corp.
CrossFire is a trademark of ATI Technologies, Inc.
Typical Operating Circuit appears at end of data sheet.