3.3V, 622Mbps LVDS, Dual Crosspoint Switch MAX3640 dual-path cros

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3.3V, 622Mbps LVDS, Dual Crosspoint Switch MAX3640 dual-path cros

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19-4800; 3/00
3.3V, 622Mbps LVDS, Dual Crosspoint Switch
MAX3640 dual-path crosspoint switch OC-12 data rates. MAX3640 used receive transmit 622Mbps low-voltage differential signals (LVDS) across backplane with minimum jitter accumulation. Each path incorporates input buffers, multiplexers, crosspoint switch, output drivers. four output channels have redundant outputs test fanning purposes. device offers signal-path redundancy critical data streams. MAX3640 unique power-saving feature. When four output channels been de-selected, output drivers powered down reduce power consumption 165mW. fully differential architecture ensures crosstalk, jitter accumulation, signal skew. MAX3640 available 48-pin TQFP package operates from +3.3V supply over +85°C temperature range. Single +3.3V Supply 257mW Power Consumption (four output channels enabled) 2.8psRMS Output Random Jitter 42ps Output Deterministic Jitter Power-Down Feature Deselected Outputs 110ps Channel-to-Channel Skew 240ps Output Edge Speed LVDS Inputs/Outputs LVDS Output 3-State Enable
Features
MAX3640
Applications
SONET/SDH Backplanes High-Speed Parallel Links Digital Cross-Connects System Interconnects ASwitch Cores
PART MAX3640UCM
Ordering Information
TEMP. RANGE +85°C PIN-PACKAGE TQFP
Configuration appears data sheet.
Typical Operating Circuit
MAX3869 LASER DRIVER OPTICAL TRANSCEIVER 2.5Gbps MAX3831 4-CHANNEL INTERCONNECT MUX/DEMUX 622Mbps
SONET SOURCE MAX3640 CROSSPOINT SWITCH SONET SOURCE 622Mbps
MAX3866
MAX3876
PARALLEL DATA OUTPUT
Maxim Integrated Products
free samples latest literature, visit www.maxim-ic.com phone 1-800-998-8800. small orders, phone 1-800-835-8769.
3.3V, 622Mbps LVDS, Dual Crosspoint Switch MAX3640
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, .-0.5V 5.0V Input Voltage (LVDS, TTL).-0.5V (VCC 0.5V) Output Voltage (LVDS) .-0.5V (VCC 0.5V) Continuous Power Dissipation +85°C) 48-Pin TQFP (derate 12.5mW/°C) .813mW Operating Temperature Range.0°C +85°C Storage Temperature Range -55°C +150°C Lead Temperature (soldering, 10s) .+300°C
Stresses beyond those listed under "Absolute Maximum Ratings" cause permanent damage device. These stress ratings only, functional operation device these other conditions beyond those indicated operational sections specifications implied. Exposure absolute maximum rating conditions extended periods affect device reliability.
ELECTRICAL CHARACTERISTICS
(VCC +3.0V 3.6V, LVDS differential load ±1%, +85°C. Typical values +3.3V, +25°C, unless otherwise noted.)
PARAMETER Supply Current LVDS INPUTS OUTPUTS Input Voltage Range Differential Input Threshold Threshold Hysteresis Differential Input Impedance Input Common-Mode Current Output Voltage High Output Voltage Output Voltage Swing Change Magnitude Differential Output Complementary States Offset Output Voltage Change Magnitude Output Offset Voltage Complementary States Differential Output Impedance Output Current INPUTS Input Voltage High Input Voltage Input Current High Input Current 2.0V 0.8V -250 -550 VIDTH VHYST |VOD| |VOD| |VOS| ENA, ENA, Shorted together Figure 1.125 LVDS input, 1.2V Figure Figure Figure 0.925 1.275 -100 1.475 2400 SYMBOL CONDITIONS Eight outputs enabled Four outputs enabled UNITS
3.3V, 622Mbps LVDS, Dual Crosspoint Switch
ELECTRICAL CHARACTERISTICS
(VCC +3.0V 3.6V, LVDS differential load ±1%, +85°C. Typical values +3.3V, +25°C, unless otherwise noted.) (Note
PARAMETER Parallel Input/Output Data Rate Output Rise/Fall Time Output Random Jitter Output Deterministic Jitter LVDS Output Differential Skew LVDS Output Channel-toChannel Skew LVDS Output Enable Time LVDS Output Disable Time LVDS Propagation Delay from Input Output tSKEW1 tSKEW2 (Note SYMBOL CONDITIONS UNITS Mbps psRMS
MAX3640
Note characteristics guaranteed design characterization. Note Deterministic jitter (DJ) arithmetic pattern-dependent jitter pulse-width distortion. measured while applying 100mVp-p noise 2MHz) power supply.
LVDS+ SINGLE ENDED 125mV 200mV 1.2V ±75mV 250mV 400mV
250mV 400mV
1.2V ±75mV LVDSSINGLE ENDED 125mV 200mV
250mV 400mV (LVDS+) (LVDS-) DIFFERENTIAL OUTPUT VOLTAGE 500mV 800mV
Figure LVDS Output Levels
3.3V, 622Mbps LVDS, Dual Crosspoint Switch MAX3640
Typical Operating Characteristics
(VCC +3.3V, +25°C, unless otherwise noted.)
DIFFERENTIAL OUTPUT VOLTAGE TEMPERATURE
MAX3640 toc01
SUPPLY CURRENT TEMPERATURE
SUPPLY CURRENT (mA) TEMPERATURE (°C) OUTPUTS ENABLED OUTPUTS ENABLED DIFFERENTIAL OUTPUT VOLTAGE (mVp-p)
TEMPERATURE (°C)
622Mbps DIAGRAM
MAX3640 toc03
1.25Gbps DIAGRAM
INPUT PRBS CONTAINS ZEROS
MAX3640 toc04
INPUT PRBS CONTAINS ZEROS
100mV/div
100mV/div
200ps/div
100ps/div
MAX3640 toc02
3.3V, 622Mbps LVDS, Dual Crosspoint Switch MAX3640
Description
17-20 NAME DIA3+, DIA4+, DIA1+, DIA2+ DIA3-, DIA4-, DIA1-, DIA2DIB1+, DIB2+, DIB3+, DIB4+ DIB1-, DIB2-, DIB3-, DIB4SEL1-SEL4 DOB4-, DOB3-, DOB2-, DOB1DOB4+, DOB3+, DOB2+, DOB1+ DOA4-, DOA3-, DOA2-, DOA1DOA4+, DOA3+, DOA2+, DOA1+ IN_SEL Positive Supply Voltage Supply Ground Positive LVDS, Channel-A Data Input Negative LVDS, Channel-A Data Input Positive LVDS, Channel-B Data Input Negative LVDS, Channel-B Data Input Crosspoint Switch Select, Input. (Table Negative LVDS, Channel-B Data Output Positive LVDS, Channel-B Data Output Negative LVDS, Channel-A Data Output Positive LVDS, Channel-A Data Output Channel-B Output Enable, Input. high enables DOB1-DOB4. powers down DOB1-DOB4 sets them high-impedance state. Channel-A Output Enable, Input. high enables DOA1-DOA4. powers down DOA1-DOA4 sets them high-impedance state. Input Select Pin, Input. Connect logic high VCC) select DIA1-DIA4. Connect logic GND) select DIB1-DIB4. FUNCTION
Detailed Description
Figure shows MAX3640's architecture. consists data paths; each data path begins with four differential input buffers. IN_SEL selects whether channels passed crosspoint switch that follows. SEL_ pins control routing crosspoint switch. Each crosspoint switch output drives pair LVDS output drivers. This provides redundant outputs that used fan-out test purposes. Each outputs, DOA_ DOB_, enabled disabled pins. Table routing controls.
LVDS Inputs Outputs
MAX3640 features LVDS inputs outputs interfacing with high-speed digital circuitry. LVDS standard based IEEE 1596.3 LVDS specification. This technology uses 500mV 800mV differential low-voltage swings achieve fast transition times, power dissipation, improved noise immunity. proper operation, data outputs require differential termination between inverting noninverting pins. terminate these outputs ground. Figure LVDS output voltage specifications. data inputs internally terminated with differential therefore require external termination.
3.3V, 622Mbps LVDS, Dual Crosspoint Switch MAX3640
DIA1+ DIA1-
CROSSPOINT SWITCH
MAX3640
DOA1+
DOA1DIB1+ DIB1DOB1SEL1
DOB1+
DIA2+ DIA20
DOA2+
DOA2-
DIB2+ DIB2-
DOB2+
DOB2-
SEL2 DIA3+ DIA32x2 CROSSPOINT SWITCH DOA3DIB3+ DIB3DOB3SEL3 DIA4+ DOA4+ DIA40 DOA4DIB4+ DIB4DOB4SEL4 DOB4+ DOB3+
DOA3+
IN_SEL
Figure Functional Diagram
3.3V, 622Mbps LVDS, Dual Crosspoint Switch MAX3640
Table Output Routing
ROUTING CONTROLS IN_SEL SEL1 SEL2 IN_SEL SEL3 SEL4 OUTPUT SIGNALS Signal DOA1/DOB1 DIB1 DIB1 DIB2 DIB2 DIA1 DIA1 DIA2 DIA2 Signal DOA3/DOB3 DIB3 DIB3 DIB4 DIB4 DIA3 DIA3 DIA4 DIA4 Signal DOA2/DOB2 DIB1 DIB2 DIB1 DIB2 DIA1 DIA2 DIA1 DIA2 Signal DOA4/DOB4 DIB3 DIB4 DIB3 DIB4 DIA3 DIA4 DIA3 DIA4
Note: Disabling outputs using will drive DOA_ DOB_ data outputs high-impedance state.
+3.3V
LVPECL DRIVER
MAX3640
+3.3V
Figure LVPECL LVDS Interface
3.3V, 622Mbps LVDS, Dual Crosspoint Switch MAX3640
Applications Information
Interfacing LVPECL Outputs MAX3640 LVDS Inputs
DC-couple between LVPECL LVDS, resistor network shown Figure Note that LVPECL output optimized load equivalent network used. Also, network attenuation should such that LVPECL output signal after attenuation well within LVDS input range. Note that LVDS input impedance true between inputs. differential impedance does contribute termination impedance, does contribute termination impedance. This means that impedance will always different.
Layout Techniques
best performance, good high-frequency layout techniques. Filter voltage supplies, keep ground connections short. multiple vias where possible. Also, controlled-impedance transmission lines interface with MAX3640 data inputs outputs.
Interface Models
Figure shows interface model LVDS inputs, while Figure shows model LVDS outputs.
MAX3640
DIA1+
1.5k
DIA11.5k
Figure LVDS Input Model
3.3V, 622Mbps LVDS, Dual Crosspoint Switch MAX3640
Chip Information
TRANSISTOR COUNT: 2453
DOA1+
DOA1-
MAX3640
Figure LVDS Output Model
Configuration
IN_SEL DOA1+ DOA2+
DOA139
DOA2-
DIA2+
DIA1+
DIA2-
DIA1-
DIA3+ DIA3DIA4+ DIA4DIB1+ DIB1DIB2+ DIB2GND
DOA3+ DOA3DOA4+ DOA4DOB1+ DOB1DOB2+ DOB2GND
MAX3640
DIB3+ DIB3DIB4+ DIB4SEL1 SEL2 SEL3 SEL4 DOB4DOB4+ DOB3DOB3+
3.3V, 622Mbps LVDS, Dual Crosspoint Switch MAX3640
Package Information
32L/48L,TQFP.EPS
3.3V, 622Mbps LVDS, Dual Crosspoint Switch MAX3640
NOTES
3.3V, 622Mbps LVDS, Dual Crosspoint Switch MAX3640
NOTES
Maxim cannot assume responsibility circuitry other than circuitry entirely embodied Maxim product. circuit patent licenses implied. Maxim reserves right change circuitry specifications without notice time.
_Maxim Integrated Products, Gabriel Drive, Sunnyvale, 94086 408-737-7600 2000 Maxim Integrated Products Printed registered trademark Maxim Integrated Products.

3.3V, 622Mbps LVDS, Dual Crosspoint Switch MAX3640 dual-path cros

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