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19-2808; Rev 0; 4/03
Single LVDS/Anything-to-LVPECL Translator
General Description
The MAX9375 is a fully differential, high-speed, anything-to-LVPECL translator designed for signal rates up to 2GHz. The MAX9375's extremely low propagation delay and high speed make it ideal for various highspeed network routing and backplane applications. The MAX9375 accepts any differential input signal within the supply rails and with minimum amplitude of 100mV. Inputs are fully compatible with the LVDS, LVPECL, HSTL, and CML differential signaling standards. Outputs are LVPECL and have sufficient current to drive 50 transmission lines. The MAX9375 is available in an 8-pin MAX package and operates from a single +3.3V supply over the -40C to +85C temperature range.
Features
o Guaranteed 2GHz Switching Frequency o Accepts LVDS/LVPECL/Anything Inputs o 421ps (typ) Propagation Delays o 30ps (max) Pulse Skew o 2psRMS (max) Random Jitter o Minimum 100mV Differential Input to Guarantee AC Specifications o Temperature-Compensated LVPECL Output o +3.0V to +3.6V Power-Supply Operating Range o >2kV ESD Protection (Human Body Model)
MAX9375
Applications
Backplane Logic Standard Translation LAN WAN DSLAM DLC
PART MAX9375EUA
Ordering Information
TEMP RANGE -40C to +85C PIN-PACKAGE 8 MAX
Functional Diagram
TOP VIEW
Pin Configuration
VCC IN LVDS/ANY LVPECL IN SINGLE TRANSLATOR GND
1 2 3 4
MAX9375
8 VCC 7 OUT
6 OUT 5 GND
MAX
________________________________________________________________ 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.
Single LVDS/Anything-to-LVPECL Translator MAX9375
ABSOLUTE MAXIMUM RATINGS
VCC to GND ...........................................................-0.3V to +4.1V Inputs (IN, IN) .............................................-0.3V to (VCC + 0.3V) IN to IN................................................................................3.0V Continuous Output Current .................................................50mA Surge Output Current .......................................................100mA Continuous Power Dissipation (TA = +70C) 8-Pin MAX (derate 5.9mW/C above +70C) ..........470.6mW JA in Still Air............................................................+170C/W Junction Temperature ......................................................+150C Storage Temperature Range .............................-65C to +150C ESD Protection Human Body Model (IN, IN, OUT, OUT) ......................... 2kV Soldering Temperature (10s) ...........................................+300C
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.
DC ELECTRICAL CHARACTERISTICS
(VCC = +3.0V to +3.6V, differential input voltage |VID| = 0.1V to 3.0V, input voltage (VIN, V IN) = 0 to VCC, input common-mode voltage VCM = 0.05V to (VCC - 0.05V), LVPECL outputs terminated with 50 1% to VCC - 2.0V, TA = -40C to +85C. Typical values are at VCC = +3.3V, |VID| = 0.2V, input common-mode voltage VCM = 1.2V, TA = +25C, unless otherwise noted.) (Notes 1, 2, 3)
PARAMETER SYMBOL CONDITIONS -40C MIN TYP MAX MIN +25C TYP MAX MIN +85C TYP MAX UNITS
DIFFERENTIAL INPUTS (IN, IN) Differential Input Threshold Input Current Input CommonMode Voltage VTHD IIN, I IN VCM VIN, V IN = VCC or 0V Figure 1 -100 -20 0.05 +100 +20 VCC 0.05 -100 -20 0.05 +100 +20 VCC 0.05 -100 -20 0.05 +100 +20 VCC 0.05 mV A V
LVPECL OUTPUTS (OUT, OUT) Single-Ended Output High Voltage Single-Ended Output Low Voltage VOH VCC - VCC - VCC 1.085 1.017 0.880 VCC - VCC 1.025 0.983 VCC 0.880 VCC 1.025 VCC - VCC 0.966 0.880 V
VOL
VCC - VCC - VCC 1.830 1.753 1.620 595 725
VCC - VCC 1.810 1.710 595 725
VCC 1.620
VCC 1.810 595
VCC - VCC 1.692 1.620 725
V
Differential Output VOH - VOL Voltage POWER SUPPLY Supply Current ICC All pins open except VCC, GND
mV
10
18
12
18
14
18
mA
2
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Single LVDS/Anything-to-LVPECL Translator
AC ELECTRICAL CHARACTERISTICS
(VCC = +3.0V to +3.6V, differential input voltage |VID| = 0.1V to 1.2V, input frequency 1.34GHz, differential input transition time = 125ps (20% to 80%), input voltage (VIN, V IN) = 0 to VCC, input common-mode voltage VCM = 0.05V to (VCC - 0.05V), outputs terminated with 50 1% to VCC - 2.0V, TA = -40C to +85C. Typical values are at VCC = +3.3V, |VID| = 0.2V, input common-mode voltage VCM = 1.2V, TA = +25C, unless otherwise noted.) (Note 4)
PARAMETER Switching Frequency Propagation Delay Low to High Propagation Delay High to Low Pulse Skew |tPLH -tPHL| Output Low-to-High Transition Time (20% to 80%) Output High-to-Low Transition Time (20% to 80%) Added Random Jitter SYMBOL fMAX tPLH tPHL tSKEW tR tF tRJ Figure 2 Figure 2 Figure 2 (Note 5) Figure 2 Figure 2 fIN = 1.34GHz (Note 6) CONDITIONS VOH - VOL 250mV MIN 2.0 250 250 TYP 2.5 421 421 6 116 116 0.7 600 600 30 220 220 2 MAX UNITS GHz ps ps ps ps ps ps(RMS)
MAX9375
Note 1: Measurements are made with the device in thermal equilibrium. All voltages are referenced to ground except VTHD and VID. Note 2: Current into a pin is defined as positive. Current out of a pin is defined as negative. Note 3: DC parameters production tested at TA = +25C and guaranteed by design and characterization over the full operating temperature range. Note 4: Guaranteed by design and characterization, not production tested. Limits are set at 6 sigma. Note 5: tSKEW is the magnitude difference of differential propagation delays for the same output under the same conditions; tSKEW = |tPHL - tPLH|. Note 6: Device jitter added to the input signal.
Typical Operating Characteristics
(VCC = +3.3V, differential input voltage |VID| = 0.2V, VCM = 1.2V, input frequency = 500MHz, outputs terminated with 50 1% to VCC - 2.0V, TA = +25C, unless otherwise noted.)
SUPPLY CURRENT vs. FREQUENCY
NO LOAD 25 SUPPLY CURRENT (mA) 20 15 10 5 0 0 500 1000 FREQUENCY (MHz) 1500 2000
MAX9375 toc01
OUTPUT AMPLITUDE vs. FREQUENCY
MAX9375 toc02
30
900 800 OUTPUT AMPLITUDE (mV) 700 600 500 400 300 0 500 1000 FREQUENCY (MHz) 1500
2000
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3
Single LVDS/Anything-to-LVPECL Translator MAX9375
Typical Operating Characteristics (continued)
(VCC = +3.3V, differential input voltage |VID| = 0.2V, VCM = 1.2V, input frequency = 500MHz, outputs terminated with 50 1% to VCC - 2.0V, TA = +25C, unless otherwise noted.)
PROPAGATION DELAY vs. TEMPERATURE
MAX9375 toc03
OUTPUT RISE/FALL TIME vs. TEMPERATURE
MAX9375 toc04
450 440 PROPAGATION DELAY (ps) 430 420 tPHL 410 400 390 -40 -15 10 35 60 tPLH
130 125 120 115 110 105 100 tF tR
85
OUTPUT RISE/FALL TIME (ps)
-40
-15
10
35
60
85
TEMPERATURE (C)
TEMPERATURE (C)
Detailed Description
The MAX9375 is a fully differential, high-speed, anything-to-LVPECL translator designed for signal rates up to 2GHz. The MAX9375's extremely low propagation delay and high speed make it ideal for various highspeed network routing and backplane applications. The MAX9375 accepts any differential input signals within the supply rails and with a minimum amplitude of 100mV. Inputs are fully compatible with the LVDS, LVPECL, HSTL, and CML differential signaling standards. Outputs are LVPECL and have sufficient current to drive 50 transmission lines.
PIN NAME
Pin Description
FUNCTION Positive Supply. Bypass from VCC to GND with 0.1F and 0.01F ceramic capacitors. Place the capacitors as close to the device as possible with the smaller value capacitor closest to the device. LVDS/Anything Noninverting Input LVDS/Anything Inverting Input Power Supply Ground Connection Differential LVPECL Inverting Output. Terminate with 50 1% to VCC - 2V. Differential LVPECL Noninverting Output. Terminate with 50 1% to VCC - 2V.
1, 8
VCC
2 3 4, 5 6 7
IN IN GND OUT OUT
Inputs
Inputs have a wide common-mode range of 0.05V to (VCC - 0.05V), which accommodates any differential signals within rails, and requires a minimum of 100mV to switch the outputs. This allows the MAX9375 inputs to support virtually any differential signaling standard.
LVPECL Outputs
The MAX9375 outputs are emitter followers that require external resistive paths to a voltage source (VT = VCC - 2.0V typ) more negative than worst-case VOL for proper
static and dynamic operation. When properly terminated, the outputs generate steady-state voltage levels, VOL or VOH with fast transition edges between state levels. Output current always flows into the termination during proper operation.
4
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Single LVDS/Anything-to-LVPECL Translator
Applications Information
Output Termination
Terminate the outputs with 50 to (VCC - 2V) or use equivalent Thevenin terminations. Terminate OUT and OUT with identical termination on each for low-output distortion. When a single-ended signal is taken from the differential output, terminate both OUT and OUT. Ensure that output currents do not exceed the current limits as specified in the Absolute Maximum Ratings. Under all operating conditions, the device's total thermal limits should be observed.
VCC VID
MAX9375
VCM (MAX) = VCC - 0.05V
VID
VCM (MIN) = 0.05V
GND
Supply Bypassing
Bypass VCC to ground with high-frequency surfacemount ceramic 0.1F and 0.01F capacitors. Place the capacitors as close to the device as possible with the 0.01F capacitor closest to the device pins.
Figure 1. Input Definitions
Traces
Circuit board trace layout is very important to maintain the signal integrity of high-speed differential signals. Maintaining integrity is accomplished in part by reducing signal reflections and skew, and increasing common-mode noise immunity. Signal reflections are caused by discontinuities in the 50 characteristic impedance of the traces. Avoid discontinuities by maintaining the distance between differential traces, not using sharp corners or using vias. Maintaining distance between the traces also increases common-mode noise immunity. Reducing signal skew is accomplished by matching the electrical length of the differential traces.
IN VID IN tPHL OUT VOH - VOL OUT 80% DIFFERENTIAL OUTPUT WAVEFORM VOH - VOL 20% OUT - OUT tR tF 20% 80% 0V DIFFERENTIAL tPLH VOH VOL 0V DIFFERENTIAL
VOH - VOL
Figure 2. Differential Input-to-Output Propagation Delay Timing Diagram
Chip Information
TRANSISTOR COUNT: 614 PROCESS: Bipolar
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5
Single LVDS/Anything-to-LVPECL Translator MAX9375
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.)
4X S
8
8
INCHES DIM A A1 A2 b MIN 0.002 0.030 MAX 0.043 0.006 0.037
MILLIMETERS MAX MIN 0.05 0.75 1.10 0.15 0.95
y 0.500.1
E
H
0.60.1
c D e E H L
1
1
0.60.1
S
D
BOTTOM VIEW
0.014 0.010 0.007 0.005 0.120 0.116 0.0256 BSC 0.120 0.116 0.198 0.188 0.026 0.016 6 0 0.0207 BSC
0.25 0.36 0.13 0.18 2.95 3.05 0.65 BSC 2.95 3.05 4.78 5.03 0.41 0.66 0 6 0.5250 BSC
TOP VIEW
A2
A1
A
c e b L
SIDE VIEW
FRONT VIEW
PROPRIETARY INFORMATION TITLE:
PACKAGE OUTLINE, 8L uMAX/uSOP
APPROVAL DOCUMENT CONTROL NO. REV.
21-0036
1 1
J
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
6 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2003 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
8LUMAXD.EPS

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