2.75Gbps Dual Mux/Buffer MAX3781 2.75Gbps dual multiplexer (mux)

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2.75Gbps Dual Mux/Buffer MAX3781 2.75Gbps dual multiplexer (mux)

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19-1697; 8/00
2.75Gbps Dual Mux/Buffer
MAX3781 2.75Gbps dual multiplexer (mux) buffer. Each half MAX3781 transmitter with fanout receiver with mux. Operating from single +3.3V supply, this device accepts AC-coupled PECL inputs provides outputs. outputs AC-coupled compatibility with PECL inputs needed. MAX3781 packaged compact 48-pin 7x7mm TQFP exposedpaddle package typically consumes 1.2W power. power-saving mode disables unused buffer output reduces typical power 0.9W. 11ps Deterministic Jitter On-Chip Termination Resistors Compatible with Transmission Lines Ports 1.2W Power Consumption (0.9W Power-Saving Mode) +3.3V Power Supply Two-Port Integration
Features
MAX3781
_Applications
System Interconnect Redundancy Serial Backplane Redundancy 2.75Gbps Serial Communications
Typical Application Circuit
PART
SIA+ SIASERDES LO1B+ LO1BLI1A+ SWITCH SOA+ SOA-
Ordering Information
TEMP. RANGE +85°C PIN-PACKAGE TQFP-EP* MAX3781UCM
MAX3781 LO1A+
LO1A-
Exposed paddle
Configuration
LO1A+ LO1AVCC LO2A+ LO2A41
LI1ALI1B+ LI1BLO2A+ SIASIA+ SELA SELB SIB+ SIBVCC
SOA-
SOA+
SIB+ SIBSERDES
LO2ALO2B+ LO2BLI2A+ SWITCH
MAX3781
SOB+ SOB-
LI2ALI2B+ LI2B-
LI2ALI2A+ LI1A+ LI1AGND LI1BLI1B+ LI2B+ LI2B-
SOB+ SOB-
LO1B+ LO1B-
LO2B+ LO2B-
NOTE: COUPLING CAPACITORS OPTIONAL. SELB SELA TYPICAL VALUES 0.1µF.
TQFP-EP
Maxim Integrated Products
free samples latest literature, visit www.maxim-ic.com phone 1-800-998-8800. small orders, phone 1-800-835-8769.
2.75Gbps Dual Mux/Buffer MAX3781
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, .-0.5 +4.0V Continuous Current Serial Outputs (SO_, Pins) .±36mA Voltage SELA, SELB, Pins .-0.5V (VCC 0.5V) Common-Mode Input Voltage (SI_, Pins).-0.5V (VCC 0.5V) Differential Input Voltage (Note .±2.8V Continuous Power Dissipation +85°C) 48-Pin TQFP-EP (derate 27mW/°C above +85°C) .1.76W Operating Temperature Range. +85°C Storage Temperature Range .-55C° +150°C Lead Temperature (soldering, 10s) .+300°C
Note common-mode voltage differential voltage input should within -0.5V (VCC 0.5V).
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, RLOAD differential, data rate 2.75Gbps, +85°C, unless otherwise noted. Typical values +25°C, +3.3V.)
PARAMETER Serial Data Rate Power Dissipation Supply Current Differential Output Voltage Output Impedance Input Impedance Differential Input Voltage Random Jitter Deterministic Jitter Serial Output Edge Speed (20%-80%) Progagation Delay Input Current High Input Current +2.0V (VCC 0.3V) -0.3V +0.8V K28.5 pattern (Note 2.75Gbps input 1.25Gbps input VOUT ROUT high high VCC, differential Single ended Differential 1200 42.5 SYMBOL CONDITIONS 2750 1600 1.53 1.14 2200 57.5 2200 UNITS Mbps mVP-P mVP-P psRMS psP-P
Note Deterministic jitter measured with repeating K28.5 pattern (00111110101100000101).
2.75Gbps Dual Mux/Buffer
Typical Operating Characteristics
(VCC +3.3V, +25°C, unless otherwise noted.)
DIFFERENTIAL OUTPUT VOLTAGE DIFFERENTIAL INPUT VOLTAGE
MAX3781-01 MAX3781-02
MAX3781
SUPPLY CURRENT TEMPERATURE
1800 1600 OUTPUT VOLTAGE (mVp-p) 1400 1200 1000 TEMPERATURE (°C) SUPPLY CURRENT (mA)
DETERMINISTIC JITTER INPUT AMPLITUDE
1000 1300 1600 1900 2200
MAX3781-03
1000
10,000
INPUT VOLTAGE (mVp-p)
DETERMINISTIC JITTER (psp-p)
INPUT VOLTAGE (mVp-p)
INPUT VSWR SIMULATION)
MAX3781-04
OUTPUT VSWR SIMULATION)
VSWR
MAX3781-05
VSWR 1000 FREQUENCY (MHz)
10,000
1000 FREQUENCY (MHz)
10,000
2.75Gbps Dual Mux/Buffer MAX3781
Description
NAME Ground FUNCTION
SIASIA+ SELA SELB SIB+ SIBSOB+ SOBLO1B+ LO1BLO2B+ LO2BLI2BLI2B+ LI1B+ LI1BLI1ALI1A+ LI2A+ LI2ALO2ALO2A+ LO1ALO1A+ SOASOA+ Exposed Paddle
Power
Serial Input Negative Serial Input Positive Select Line high select channel channel (internally pulled high). Power-Down Mode Select. high power-down mode (internally pulled high). Select Line high select channel channel (internally pulled high). Serial Input Positive Serial Input Negative Serial Output Positive Serial Output Negative Line Output Positive Line Output Negative Line Output Positive Line Output Negative Line Input Negative Line Input Positive Line Input Positive Line Input Negative Line Input Negative Line Input Positive Line Input Positive Line Input Negative Line Output Negative Line Output Positive Line Output Negative Line Output Positive Serial Output Negative Serial Output Positive Ground. This must soldered circuit board proper thermal performance (see Exposed Paddle (EP) Package).
2.75Gbps Dual Mux/Buffer MAX3781
MAX3781
LI2A LI1A
LO2A
SELA SELB LI2B LI1B LO1A
CONTROL
LO2B
CONTROL
LO1B
Figure Functional Diagram
Detailed Description
MAX3781
MAX3781 2.75Gbps dual mux/buffer. Each half MAX3781 transmitter with fanout receiver with mux. Figure functional diagram MAX3781 dual mux/buffer.
Input Stages
0.4V
input amplifiers accept AC-coupled PECL signals have on-chip differential impedance simplify termination. input structure shown Figure
Figure Input Structure
2.75Gbps Dual Mux/Buffer MAX3781
Table Operating Modes
MAX3781
SEL_
LO1_
LO2_
LI2_ LI2_ LI1_ LI1_
Control Lines
OUT+ OUT-
TTL-compatible control lines provided select MAX3781's operating mode (Table SELA SELB select data routing chip. asserted (high) disable unused output save power. control lines internally pulled high through resistors.
Output Buffers
outputs high-speed interfaces. They have back termination, eliminating need external matching resistors. output structure shown Figure
32mA
Exposed-Paddle (EP) Package
exposed-paddle, 48-pin TQFP-EP incorporates features that provide very thermal resistance path heat removal from paddle electrical ground MAX3781 should soldered circuit board proper thermal electrical performance.
Figure Output Structure
Chip Information
TRANSISTOR COUNT: 2805 PROCESS: BIPOLAR
2.75Gbps Dual Mux/Buffer
Package Information
48L,TQFP.EPS
MAX3781
2.75Gbps Dual Mux/Buffer MAX3781
Package Information (continued)
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.

2.75Gbps Dual Mux/Buffer MAX3781 2.75Gbps dual multiplexer (mux)

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