Rainbow Electronics MAX4889C - Manual

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.