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MAX3841ETG+

P1-P3P4-P6P7-P7
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)
MAX3841
12.5Gbps CML 2
×
2 Crosspoint Switch
________________________________________________________________
Maxim Integrated Products
1
Ordering Information
MAX3841
10Gbps
SERIAL
OPTICAL
MODULE
SDI+
SDI-
SDO+
SDO-
OUT1+
OUT1-
IN1+
IN1-
SEL1 SEL2 ENO1 ENO2
LOOPBACK
3.3V
V
CCVCC1OUT
VCC1IN
2.5V
2.5V
2.5V
IN2+
IN2-
OUT2+
OUT2-
SDO+
SDO-
SDI+
SDI-
VCC2IN
VCC2OUT
1.8V
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.
MAX3841
12.5Gbps CML 2
×
2 Crosspoint Switch
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
CC
= +3.0V to +3.6V, VCC_IN = +1.71V to V
CC
, VCC_OUT = +1.71V to V
CC
, T
A
= -40°C to +85°C. Typical values are at V
CC
=
+3.3V, VCC_IN = VCC_OUT = 1.8V, T
A
= +25°C, unless otherwise noted.)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Note 1: Guaranteed by design and characterization.
Note 2: Differential swing is defined as V
IN
= (IN_+) - (IN_-) and V
OUT
= (OUT_+) - (OUT_-). See Figure 1.
Note 3: Measured using a 0000011111 pattern at 12.5Gbps, and V
IN
= 400mV
P-P
differential.
Note 4: Measured at 9.953Gbps using a pattern of 100 ones, 2
7
- 1 PRBS, 100 zeros, 2
7
- 1 PRBS, and at 12.5Gbps using a ±K28.5
pattern. VCC_IN = VCC_OUT = 1.8V, and V
IN
= 400mV
P-P
differential.
Note 5: Refer to Application Note 1181:
HFAN-04.5.1: Measuring Random Jitter on a Digital Sampling Oscilloscope
.
Supply Voltage, V
CC
..............................................-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 (V
CC
+ 0.5V)
Continuous Power Dissipation (T
A
= +85°C)
24-Pin Thin QFN (derate 20.8mW/°C
above +85°C).............................................................1352mW
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-55°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Core Supply Current I
CC
Excluding CML termination currents 65 90 mA
Data Rate (Note 1) 0 12.5 Gbps
CML Input Differential V
IN
AC-coupled or DC-coupled (Note 2) 150 1200 mV
P-P
CML Input Common Mode DC-coupled VCC_IN - 0.3 VCC_IN V
CML Input Termination Single ended 42.5 50 57.5
CML Input Return Loss Up to 10GHz 12 dB
CML Output Differential V
OUT
(Note 2) 400 500 600 mV
P-P
CML Output Termination Single ended 42.5 50 57.5
CML Output Transition Time t
R
, t
F
20% to 80% (Notes 1, 3) 30 ps
Deterministic Jitter (Notes 1, 4) 10 ps
P-P
Random Jitter V
IN
= 150mV
P-P
(Notes 1, 5) 0.3 0.7 ps
RMS
Propagation Delay Any input to output (Note 1) 100 140 ps
Channel-to-Channel Skew (Note 1) 12 ps
Output Duty-Cycle Skew 50% input duty cycle (Notes 1, 3) 8 ps
LVCMOS Input Current I
IH
, I
IL
-10 +10 μA
LVCMOS Input High Voltage V
IH
1.7 V
LVCMOS Input Low Voltage V
IL
0.7 V
MAX3841
12.5Gbps CML 2
×
2 Crosspoint Switch
_______________________________________________________________________________________
3
Typical Operating Characteristics
(V
CC
= 3.3V, VCC_IN, VCC_OUT = 1.8V, V
IN
= 500mV
P-P
, T
A
= +25°C, unless otherwise noted.)
CORE SUPPLY CURRENT vs. TEMPERATURE
(EXCLUDES CML I/O CURRENTS)
MAX3841 toc01
TEMPERATURE (°C)
SUPPLY CURRENT (mA)
603510-15
50
60
70
80
90
100
110
120
130
140
40
-40 85
0 OUTPUTS ENABLE
2 OUTPUTS ENABLE
1 OUTPUT ENABLE
SUPPLY CURRENT vs. TEMPERATURE
(CORE PLUS CML I/O CURRENTS)
MAX3841 toc02
TEMPERATURE (°C)
SUPPLY CURRENT (mA)
603510-15
50
60
70
80
90
100
110
120
130
140
40
-40 85
0 OUTPUTS ENABLE
2 OUTPUTS ENABLE
1 OUTPUT ENABLE
CML INPUTS AND OUTPUTS AC-COUPLED
OUTPUT EYE DIAGRAM
(12.5Gbps, 2
23
- 1 PRBS)
MAX3841 toc03
14ps/div
60mV/div
OUTPUT EYE DIAGRAM
(10.7Gbps, 2
23
- 1 PRBS)
MAX3841 toc04
16ps/div
60mV/div
OUTPUT EYE DIAGRAM
(6.25Gbps, 2
23
- 1 PRBS)
MAX3841 toc05
28ps/div
60mV/div
OUTPUT EYE DIAGRAM
(622Mbps, 2
23
- 1 PRBS)
MAX3841 toc06
270ps/div
60mV/div
DETERMINISTIC JITTER
vs. TEMPERATURE
MAX3841 toc07
TEMPERATURE (°C)
DETERMINISTIC JITTER (ps)
6035-15 10
2
4
6
8
10
12
14
16
0
-40 85
2
7
- 1 PRBS + 100CIDs
AT 10.7Gbps
±K28.5 AT 12.5Gbps
DIFFERENTIAL OUTPUT SWING
vs. TEMPERATURE
MAX3841 toc08
TEMPERATURE (°C)
DIFFERENTIAL OUTPUT (mV
P-P
)
603510-15
460
470
480
490
500
510
520
530
540
550
450
-40 85
PROPAGATION DELAY
MAX3841 toc09
100ps/div
OUT1
IN1
P1-P3P4-P6P7-P7

MAX3841ETG+

Mfr. #:
Buy MAX3841ETG+
Manufacturer:
Maxim Integrated
Description:
Analog & Digital Crosspoint ICs 12.5Gbps CML 2x2 Crosspoint Switch
Lifecycle:
New from this manufacturer.
Delivery:
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