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19-2285; Rev 0; 1/02
Quad Differential LVECL-to-LVPECL Translators
General Description
The MAX9420–MAX9423 are extremely fast, low-skew quad LVECL-to-LVPECL translators designed for highspeed signal and clock driver applications. The devices feature ultra-low propagation delay of 336ps and channel-to-channel skew of 17ps. The four channels can be operated synchronously with an external clock, or in asynchronous mode, determined by the state of the SEL input. An enable input provides the ability to force all the outputs to a differential low state. These devices operate with a negative supply voltage of -2.0V to -3.6V, compatible with LVECL input signals. The positive supply range is 2.375V to 3.6V for differential LVPECL output signals. A variety of input and output terminations are offered for maximum design flexibility. The MAX9420 has open inputs and open-emitter outputs. The MAX9421 has open inputs and 50Ω series outputs. The MAX9422 has 100Ω differential input impedance and open-emitter outputs. The MAX9423 has 100 Ω differential input impedance and 50Ω series outputs. The MAX9420–MAX9423 are specified for operation from -40°C to +85°C, and are offered in space-saving 32-pin 5mm ✕ 5mm TQFP and 32-lead 5mm ✕ 5mm QFN packages.
Features
o >500mV Differential Output at 3.0GHz Clock o 336ps (typ) Propagation Delay in Asynchronous Mode o 17ps (typ) Channel-to-Channel Skew o Integrated 50Ω Outputs (MAX9421/MAX9423) o Integrated 100Ω Inputs (MAX9422/MAX9423) o Synchronous/Asynchronous Operation
MAX9420–MAX9423
Ordering Information
PART MAX9420EHJ MAX9421EHJ MAX9422EHJ MAX9423EHJ TEMP RANGE PINDATA OUTPUT PACKAGE INPUT Open Open Open Open 100Ω 100Ω 100Ω 100Ω Open Open 50Ω 50Ω Open Open 50Ω 50Ω
-40°C to +85°C 32 TQFP -40°C to +85°C 32 TQFP -40°C to +85°C 32 TQFP -40°C to +85°C 32 TQFP
MAX9420EGJ* -40°C to +85°C 32 QFN MAX9421EGJ* -40°C to +85°C 32 QFN MAX9422EGJ* -40°C to +85°C 32 QFN MAX9423EGJ* -40°C to +85°C 32 QFN
Applications
Data and Clock Driver and Buffer Central Office Backplane Clock Distribution DSLAM Backplane
*Future product—contact factory for availability.
Pin Configurations
OUT0 GND VCC IN0 IN0 IN1 26 32 VEE SEL SEL CLK CLK EN EN 1 2 3 4 5 6 7 8 9 IN3 10 IN3 11 VCC 12 OUT3 13 OUT3 14 GND 15 IN2 16 IN2 31 30 29 28 27 IN1 25 24 VCC 23 OUT1 22 OUT1 21 GND 20 GND 19 OUT2 18 OUT2 17 VCC
Base Station ATE
TOP VIEW
MAX9420 MAX9421 MAX9422 MAX9423
Functional Diagram appears at end of data sheet.
VEE
TQFP (5mm x 5mm)
Pin Configurations continued at end of data sheet. ________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
OUT0
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Quad Differential LVECL-to-LVPECL Translators MAX9420–MAX9423
ABSOLUTE MAXIMUM RATINGS
VCC to GND ...........................................................-0.3V to +4.1V VEE to GND............................................................-4.1V to +0.3V Inputs to GND .............................................(VEE - 0.3V) to +0.3V Differential Input Voltage .......................................................±3V Continuous Output Current .................................................50mA Surge Output Current........................................................100mA Continuous Power Dissipation (TA = +70°C) Single-Layer PC Board 32-Pin 5mm ✕ 5mm TQFP (derate 9.5mW/°C above +70°C) ................................761mW 32-Lead 5mm ✕ 5mm QFN (derate 21.3mW/°C above +70°C) .................................1.7W Junction-to-Ambient Thermal Resistance in Still Air 32-Pin 5mm ✕ 5mm TQFP......................................+105°C/W 32-Lead 5mm ✕ 5mm QFN ......................................+47°C/W Junction-to-Ambient Thermal Resistance with 500 LFPM Airflow 32-Pin 5mm ✕ 5mm TQFP.........................................+73°C/W Junction-to-Case Thermal Resistance 32-Pin 5mm ✕ 5mm TQFP.........................................+25°C/W 32-Lead 5mm ✕ 5mm QFN .........................................+2°C/W Operating Temperature Range ...........................-40°C to +85°C Junction Temperature ......................................................+150°C Storage Temperature Range .............................-65°C to +150°C ESD Protection Human Body Model (IN_, IN_) ........................................500V Others.............................................................................1.2kV Lead Temperature (soldering, 10s) .................................+300°C
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 dev.