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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

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)

MAX3841

12.5Gbps CML 2

2 Crosspoint Switch

________________________________________________________________

Maxim Integrated Products

Ordering Information

MAX3841

10Gbps

SERIAL

OPTICAL

MODULE

SDI+

SDI-

SDO+

SDO-

OUT1+

OUT1-

IN1+

IN1-

SEL1 SEL2 ENO1 ENO2

LOOPBACK

3.3V

CCVCC1OUT

VCC1IN

2.5V

IN2+

IN2-

OUT2+

OUT2-

SDO+

SDO-

SDI+

SDI-

VCC2IN

VCC2OUT

1.8V

GND

10Gbps

CDR/SERDES

ASIC

3.3V

1.8V

Typical Application Circuit

19-2905; Rev 1; 3/09

EVALUATION KIT

AVAILABLE

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*

Pin Configuration appears at end of data sheet.

Denotes a lead(Pb)-free/RoHS-compliant package.

EP = Exposed pad.

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.

Summary of content (7 pages)

PAGE 1
9-2905; Rev 1; 3/09 KIT ATION EVALU E L B A AVAIL 12.5Gbps CML 2 × 2 Crosspoint Switch The MAX3841 is a low-power, 12.5Gbps 2 × 2 crosspoint switch IC for high-speed serial data loopback, redundancy, and switching applications. The MAX3841 current-mode logic (CML) inputs and outputs have isolated VCC connections to enable DC-coupled interfaces to 1.8V, 2.5V, or 3.3V CML ICs.
PAGE 2
MAX3841 12.5Gbps CML 2 × 2 Crosspoint Switch ABSOLUTE MAXIMUM RATINGS Supply Voltage, VCC..............................................-0.5V to +4.0V CML Supply Voltage (VCC_IN, VCC_OUT)...........-0.5V to +4.0V Continuous Output Current (OUT1±, OUT2±)...................±25mA CML Input Voltage (IN1±, IN2±)...........-0.5V to (VCC_IN + 0.5V) LVCMOS Input Voltage (SEL1, SEL2, ENO1, ENO2) .........................................-0.5V to (VCC + 0.
PAGE 3
12.5Gbps CML 2 × 2 Crosspoint Switch CORE SUPPLY CURRENT vs. TEMPERATURE (EXCLUDES CML I/O CURRENTS) 110 0 OUTPUTS ENABLE 100 1 OUTPUT ENABLE 90 2 OUTPUTS ENABLE 80 130 70 110 70 50 40 40 35 60 60mV/div 80 60 10 0 OUTPUTS ENABLE 90 50 -15 1 OUTPUT ENABLE 100 60 -40 2 OUTPUTS ENABLE 120 SUPPLY CURRENT (mA) SUPPLY CURRENT (mA) 120 85 CML INPUTS AND OUTPUTS AC-COUPLED -40 -15 10 35 60 TEMPERATURE (°C) TEMPERATURE (°C) OUTPUT EYE DIAGRAM (10.
PAGE 4
12.5Gbps CML 2 × 2 Crosspoint Switch MAX3841 Pin Description PIN NAME FUNCTION 1, 12 VCC 2, 5 VCC1IN +3.3V Core Supply Voltage 3 IN1+ Positive Serial Data Input 1, CML 4 IN1- Negative Serial Data Input 1, CML 6 SEL1 Output 1 Select, LVCMOS Input. See Table 1. 7 SEL2 Output 2 Select, LVCMOS Input. See Table 1.
PAGE 5
12.5Gbps CML 2 × 2 Crosspoint Switch 75mV MIN 600mV MAX V+ 150mV MIN (V+) - (V-) 1200mV MAX ENO1 ENO2 SEL1 SEL2 OUT1 OUT2 0 0 0 0 IN2 IN1 0 0 0 1 IN2 IN2 0 0 1 0 IN1 IN1 0 0 1 1 IN1 IN2 1 1 X X Disabled Disabled Applications Information Select and Enable Controls The MAX3841 provides two LVCMOS-compatible select inputs, SEL1 and SEL2. Either data input can be connected to either or both data outputs.
PAGE 6
12.5Gbps CML 2 × 2 Crosspoint Switch Chip Information TRANSISTOR COUNT: 950 PROCESS: SiGe BiCMOS ENO2 VCC2OUT OUT2- OUT2+ GND TOP VIEW VCC2OUT MAX3841 Pin Configuration Package Information 24 23 22 21 20 19 VCC 1 18 ENO1 VCC1IN 2 17 VCC1OUT IN1+ 3 16 OUT1+ IN1- 4 VCC1IN 5 SEL1 6 MAX3841 15 OUT1- DOCUMENT NO.
PAGE 7
12.5Gbps CML 2 × 2 Crosspoint Switch REVISION NUMBER REVISION DATE 0 8/03 1 3/09 DESCRIPTION PAGES CHANGED Initial release. — Added a lead-free package to the Ordering Information table. 1 Changed the package code from T2444-1 to T2444-3 and replaced the package outline drawings with the Package Information table. 1, 6 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied.