MAX3841 Datasheet, PDF (1/7 Pages) Maxim Integrated Products – 12.5Gbps CML 2 × 2 Crosspoint Switch

19-2905; Rev 1; 3/09
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12.5Gbps CML 2 × 2 Crosspoint Switch
General Description
The MAX3841 is a low-power, 12.5Gbps 2 × 2 cross-
point switch IC for high-speed serial data loopback,
redundancy, and switching applications. The MAX3841
current-mode logic (CML) inputs and outputs have iso-
lated V_CC connections to enable DC-coupled interfaces
to 1.8V, 2.5V, or 3.3V CML ICs. Fully differential signal
paths and Maxim’s second-generation SiGe technology
provide optimum signal integrity, minimizing jitter,
crosstalk, and signal skew. The MAX3841 is ideal for
serial OC-192 and 10GbE optical module, line card,
switch fabric, and similar applications.
The MAX3841 has 150mV_P-P minimum differential input
sensitivity, and 500mV_P-P nominal differential output
swing. Unused outputs can be powered down individu-
ally to conserve power. In addition to functioning as a 2
× 2 switch, the MAX3841 can be configured as a 2:1
multiplexer, 1:2 buffer, or dual 1:1 buffer. The MAX3841
is available in a 4mm × 4mm 24-pin thin QFN package,
and consumes only 215mW with both outputs enabled.
Applications
OC-192, 10GbE Switch/Line Cards
OC-192, 10GbE Optical Modules
System Redundancy/Self Test
Clock Fanout
Features
♦ Up to 12.5Gbps Operation
♦ Less Than 10ps_P-P Deterministic Jitter
♦ Less Than 0.7ps_RMS Random Jitter
♦ 1.8V, 2.5V, and 3.3V DC-Coupled CML I/O
♦ Independent Output Power-Down
♦ 4mm × 4mm Thin QFN Package
♦ -40°C to +85°C Operation
♦ +3.3V Core Supply
♦ 215mW Power Consumption (Excluding
Termination Currents)
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX3841ETG
-40°C to +85°C
24 Thin QFN-EP*
MAX3841ETG+
-40°C to +85°C
24 Thin QFN-EP*
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Pin Configuration appears at end of data sheet.
Typical Application Circuit
3.3V 2.5V
10Gbps
SERIAL
OPTICAL
MODULE
SDI+
SDI-
SDO+
SDO-
2.5V
3.3V
1.8V
VCC1OUT ^VCC
OUT1+
VCC2IN
IN2+
OUT1-
IN1+
MAX3841
IN2-
OUT2+
IN1-
2.5V
OUT2-
1.8V
VCC1IN
VCC2OUT
SEL1 SEL2 ENO1 ENO2 GND
1.8V
10Gbps
CDR/SERDES
ASIC
SDO+
SDO-
SDI+
SDI-
LOOPBACK
________________________________________________________________ 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.