19-2846; Rev 1; 7/03 Anything-to-LVPECL/LVDS Translators with Pin-Selectable Divide-by-Four Features ♦ Guaranteed 2GHz Switching Frequency ♦ Accept LVDS/LVPECL/Anything Inputs ♦ Pin-Selectable Divide-by-Four Function ♦ 421ps (typ) Propagation Delays (MAX9377) ♦ 30ps (max) Pulse Skew ♦ 2psRMS (max) Random Jitter ♦ Minimum 100mV Differential Input to Guarantee AC Specifications ♦ Temperature-Compensated LVPECL Output ♦ +3.0V to +3.6V Power-Supply Operating Range ♦ ESD Protection: >2kV Human Body Model (HBM) Ordering Information Applications Backplane Logic Standard Translation PART TEMP RANGE PIN-PACKAGE LAN MAX9377EUA -40°C to +85°C 8 µMAX WAN MAX9378EUA -40°C to +85°C 8 µMAX DSLAM DLC Functional Diagram Pin Configuration TOP VIEW SEL RST SEL 1 8 VCC IN 2 7 OUT IN 3 6 OUT 5 RST LVDS/ANY GND 4 MAX9377 MAX9378 ÷4 LVPECL (MAX9377) OR LVDS (MAX9378) ________________________________________________________________ Maxim Integrated Products 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. 1 MAX9377/MAX9378 General Description The MAX9377/MAX9378 are fully differential, highspeed, low-jitter anything-to-LVPECL and anything-toLVDS translators, respectively, with a selectable divide-by-four function. Low propagation delay and high speed make them ideal for various high-speed network routing and backplane applications at speeds up to 2GHz in nondivide mode. The MAX9377/MAX9378 accept 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. The MAX9377 outputs are LVPECL and have sufficient current to drive 50Ω transmission lines. The MAX9378 outputs are LVDS and conform to the ANSI EIA/TIA-644 LVDS standard. The MAX9377/MAX9378 are available in 8-pin µMAX packages and operate from a single +3.3V supply over the -40°C to +85°C temperature range. MAX9377/MAX9378 Anything-to-LVPECL/LVDS Translators with Pin-Selectable Divide-by-Four ABSOLUTE MAXIMUM RATINGS Junction Temperature ......................................................+150°C Storage Temperature Range .............................-65°C to +150°C ESD Protection Human Body Model (IN, IN, OUT, OUT) ..............................≥2kV Soldering Temperature (10s) ...........................................+300°C VCC to GND ...........................................................-0.3V to +4.1V Inputs (IN, IN, RST, SEL) ............................-0.3V to (VCC + 0.3V) IN to IN................................................................................±3.0V Short-Circuit Duration (MAX9378 OUT, OUT) ............Continuous Continuous Output Current .................................................50mA Surge Output Current .......................................................100mA Continuous Power Dissipation (TA = +70°C) 8-µMAX (derate 5.9mW/°C above +70°C) ...............470.6mW θJA in Still Air...........................................................+170°C/W 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 50Ω ±1% to (VCC - 2.0V), LVDS outputs terminated with 100Ω ±1%, TA = -40°C to +85°C. Typical values are at VCC = +3.3V, |VID| = 0.2V, input common-mode voltage VCM = 1.2V, TA = +25°C, unless otherwise noted.) (Notes 1, 2, 3) PARAMETER SYMBOL CONDITIONS -40°C MIN TYP +25°C MAX MIN VCC 2.0 GND 0.8 0 150 -20 TYP +85°C TYP MAX UNITS MAX MIN VCC 2.0 GND 0.8 GND 0.8 V 0 150 0 150 µA +20 -20 +20 -20 +20 µA +100 -100 +100 -100 +100 mV LVCMOS/LVTTL INPUTS (RST, SEL) Input High Voltage VIH Input Low Voltage VIL Input High Current IIH VIN = VCC or 2V Input Low Current IIL VIL = 0 or 0.8V 2.0 VCC V DIFFERENTIAL INPUTS (IN, IN) Differential Input Threshold VTHD Input Current IIN, I IN Input CommonMode Voltage VCM -100 ±6 ±6 ±6 VIN, V IN = VCC or 0V -20 +20 -20 +20 -20 +20 µA Figure 1 0.05 VCC 0.05 0.05 VCC 0.05 0.05 VCC 0.05 V LVPECL OUTPUTS (OUT, OUT) (MAX9377) Single-Ended Output High Voltage VOH Figure 3 VCC 1.085 VCC 1.033 VCC - VCC - VCC 0.880 1.025 0.992 VCC0.880 VCC - VCC 1.025 0.978 VCC 0.880 V Single-Ended Output Low Voltage VOL Figure 3 VCC 1.830 VCC 1.755 VCC - VCC - VCC 1.620 1.810 1.717 VCC 1.620 VCC - VCC 1.810 1.699 VCC 1.620 V VOH VOL Figure 3 595 725 595 725 250 370 250 363 Differential Output Voltage 595 725 250 348 mV LVDS OUTPUTS (OUT, OUT) (MAX9378) Differential Output Voltage 2 VOD Figure 2 450 450 _______________________________________________________________________________________ 450 mV Anything-to-LVPECL/LVDS Translators with Pin-Selectable Divide-by-Four (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 50Ω ±1% to (VCC - 2.0V), LVDS outputs terminated with 100Ω ±1%, TA = -40°C to +85°C. Typical values are at VCC = +3.3V, |VID| = 0.2V, input common-mode voltage VCM = 1.2V, TA = +25°C, unless otherwise noted.) (Notes 1, 2, 3) PARAMETER Change in Magnitude of VOD Between Complementary Output States Offset CommonMode Voltage Change in Magnitude of VOS Between Complementary Output States SYMBOL CONDITIONS -40°C MIN +25°C TYP MAX 1.0 20 MIN +85°C TYP MAX 1.0 20 MIN UNITS TYP MAX 1.0 20 mV 1.375 V ∆VOD Figure 2 VOS Figure 2 ∆VOS Figure 2 0.1 20 0.1 20 0.1 20 mV VID = ±100mV, one output GND, other output open or shorted to GND 19.0 24 19.0 24 19.0 24 mA VID = ±100mV, VOUT = V OUT 4.0 12 4.0 12 4.0 12 mA 13 22 15 22 17 22 Output ShortCircuit Current, Either Output Shorted to GND IOS Output ShortCircuit Current, Outputs Shorted Together IOSAB 1.125 1.375 1.125 1.250 1.375 1.125 POWER SUPPLY MAX9377, all pins open except VCC, GND Supply Current mA ICC MAX9378, RL = 100, quiescent, inputs are open 18.0 30 20 30 22 30 _______________________________________________________________________________________ 3 MAX9377/MAX9378 DC ELECTRICAL CHARACTERISTICS (continued) MAX9377/MAX9378 Anything-to-LVPECL/LVDS Translators with Pin-Selectable Divide-by-Four 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), LVPECL outputs terminated with 50Ω ±1% to (VCC - 2.0V) MAX9377, LVDS outputs terminated with RL = 100Ω ±1% (MAX9378), TA = -40°C to +85°C. Typical values are at VCC = +3.3V, |VID| = 0.2V, input common-mode voltage VCM = 1.2V, TA = +25°C, unless otherwise noted.) (Note 4) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS 0.8 1.0 ns Reset-to-Differential Output Low Delay tDR Figure 4 Reset-to-Input Clock Setup Time tSET Figure 4 Clock-to-Divider Output Propagation Delay tPCO Figure 4 (Note 5) 0.6 1.0 ns SEL to Switched Output Delay tSEL Figure 5 0.3 0.6 ns Switching Frequency fMAX VOH - VOL ≥ 250mV 2.0 2.5 Propagation Delay Low to High tPLH Figure 3, SEL = 0 250 421 600 ps Propagation Delay High to Low tPHL Figure 3, SEL = 0 250 421 600 ps 0.5 ns MAX9377 Pulse Skew |tPLH -tPHL| GHz tSKEW (Note 6) 6 30 ps Output Low-to-High Transition Time (20% to 80%) tR Figure 3 116 220 ps Output High-to-Low Transition Time (20% to 80%) tF Figure 3 116 220 ps Added Random Jitter tRJ fIN = 1.34GHz (Note 7), SEL = 0 0.7 2 ps(RMS) MAX9378 Switching Frequency fMAX VOD ≥ 250mV 2.0 2.5 Propagation Delay Low to High tPLH Figure 3, SEL = 0 250 363 600 ps Propagation Delay High to Low tPHL Figure 3, SEL = 0 250 367 600 ps tSKEW Figure 3 (Note 6) 3 30 ps Pulse Skew |tPLH - tPHL| GHz Output Low-to-High Transition Time (20% to 80%) tR Figure 2 93 220 ps Output High-to-Low Transition Time (20% to 80%) tF Figure 2 93 220 ps Added Random Jitter tRJ fIN = 1.34GHz (Note 7), SEL = 0 0.8 2 ps(RMS) Note 1: Measurements are made with the device in thermal equilibrium. All voltages are referenced to ground except VTHD, VID, VOD, and ∆VOD. 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 = +25°C 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: tPCO is the delay associated with the frequency-divider function. The total delay when divide-by-four is selected is tPCO + tPLH. Note 6: tSKEW is the magnitude difference of differential propagation delays for the same output under same conditions; tSKEW = |tPHL - tPLH|. Note 7: Device jitter added to the input signal. 4 _______________________________________________________________________________________ Anything-to-LVPECL/LVDS Translators with Pin-Selectable Divide-by-Four 30 MAX9378 MAX9377 20 10 MAX9377 700 600 500 480 460 tPHL (MAX9377) tPLH (MAX9377) 440 420 tPLH (MAX9378) 400 380 360 tPHL (MAX9378) 340 MAX9378 400 500 MAX9377/78 toc03 800 320 0 300 500 1000 1500 2000 300 0 500 FREQUENCY (MHz) 1000 1500 2000 FREQUENCY (MHz) -40 -15 10 35 60 85 TEMPERATURE (°C) OUTPUT RISE/FALL TIME vs. TEMPERATURE 140 130 MAX9377/78 toc04 0 OUTPUT RISE/FALL TIME (ps) SUPPLY CURRENT (mA) 40 900 MAX9377/78 toc02 MAX9377 NO LOAD OUTPUT AMPLITUDE (mV) MAX9377/78 toc01 50 PROPAGATION DELAY vs. TEMPERATURE OUTPUT AMPLITUDE vs. FREQUENCY PROPAGATION DELAY (ps) SUPPLY CURRENT vs. FREQUENCY tF (MAX9377) 120 110 tR (MAX9377) 100 tF (MAX9378) 90 80 tR (MAX9378) 70 -40 -15 10 35 60 85 TEMPERATURE (°C) _______________________________________________________________________________________ 5 MAX9377/MAX9378 Typical Operating Characteristics (VCC = +3.3V, differential input voltage |VID| = 0.2V, VCM = 1.2V, input frequency = 500MHz, outputs terminated with 50Ω ±1% to VCC - 2.0V (MAX9377), outputs terminated with 100Ω ±1% (MAX9378), TA = +25°C, unless otherwise noted.) Anything-to-LVPECL/LVDS Translators with Pin-Selectable Divide-by-Four MAX9377/MAX9378 Pin Description PIN NAME FUNCTION Frequency Divider Select Input. High = divide by four, low = no division. Internal 75kΩ pulldown to GND. 1 SEL 2 IN Differential LVDS/Any Noninverting Input 3 IN Differential LVDS/Any Inverting Input 4 GND 5 RST 6 OUT 7 OUT 8 VCC Ground Frequency Divider Reset Input. Active high, asynchronous, reset. Internal 75kΩ pulldown to GND. MAX9377 Differential LVPECL Inverting Output. Terminate with 50Ω ±1% to VCC - 2V. MAX9378 Inverting LVDS Output. Terminate to OUT with 100Ω ±1%. MAX9377 Differential LVPECL Noninverting Output. Terminate with 50Ω ±1% to VCC - 2V. MAX9378 Noninverting LVDS Output. Terminate to OUT with 100Ω ±1%. Positive Supply. Bypass from VCC to GND with 0.1µF and 0.01µF ceramic capacitors. Place the capacitors as close to the device as possible with the smaller value capacitor closest to the device Detailed Description The MAX9377/MAX9378 are fully differential, highspeed, low-jitter anything-to-LVPECL and anything-toLVDS translators, respectively, with a selectable divide-by-four function. Low propagation delay and high speed make them ideal for various high-speed network routing and backplane applications at speeds up to 2GHz in nondivide mode. The MAX9377/MAX9378 accept 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. The MAX9377 outputs are LVPECL and have sufficient current to drive 50Ω transmission lines. The MAX9378 outputs are LVDS and conform to the ANSI EIA/TIA-644 LVDS standard. Inputs Inputs have a wide common-mode range of 0.05V to (VCC - 0.05V), which accommodates any differential signals within the supply rails, and requires a minimum of 100mV to switch the outputs. This allows the MAX9377/MAX9378 inputs to support virtually any differential signaling standard. RST and SEL Inputs The frequency-divide functions are controlled by two LVCMOS/LVTTL inputs, RST and SEL. SEL selects either the divide-by-four function or a no-division function as shown in Table 1. RST, an asynchronous activehigh input, resets the divide-by-four within the device and places the circuits into a known state. Setting RST 6 Table 1. SEL AND RST Truth Table RST SEL OUTPUT X L or open H H Outputs are placed in differential low. No frequency division. L H Divide-by-four function. high when powering up the device with SEL high prevents the unknown states with the divider from being propagated to the outputs. If the device is powered up with SEL high but without asserting RST, the outputs are only guaranteed to be 1/4th the input frequency after 2.5 cycles have been applied to the input. LVPECL Outputs (MAX9377) The MAX9377 LVPECL 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. LVDS Outputs (MAX9378) The MAX9378 LVDS outputs require a resistive load to terminate the signal and complete the transmission loop. Because the device switches current and not voltage, the actual output voltage swing is determined by the value of the termination resistor. With a 3.5mA typical output current, the MAX9378 produces an output voltage of 350mV when driving a 100Ω load. _______________________________________________________________________________________ Anything-to-LVPECL/LVDS Translators with Pin-Selectable Divide-by-Four DRV VCC VOD OUT VOS RL / 2 VID CL VCM (MAX) = VCC - 0.05V MAX9377/MAX9378 RL / 2 OUT CL GND VOD(+) 80% VID 80% VCM (MIN) = 0.05V 0V GND VOD(-) 20% 20% OUT - OUT tR Figure 1. Differential Input Definition tF Figure 2. LVDS Output Load and Transition Times Applications Information IN LVPECL Output Termination (MAX9377) Terminate the MAX9377 LVPECL outputs with 50Ω 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. LVDS Output Termination (MAX9378) The MAX9378 LVDS outputs are current-steering devices; no output voltage is generated without a termination resistor. The termination resistors should match the differential impedance of the transmission line. Output voltage levels are dependent upon the value of the termination resistor. The MAX9378 is optimized for point-to-point communication with the 100Ω termination resistor at the receiver inputs. Termination resistance values may range between 90Ω and132Ω, depending on the characteristic impedance of the transmission medium. Supply Bypassing Bypass VCC to ground with high-frequency surfacemount ceramic 0.1µF and 0.01µF capacitors. Place the capacitors as close to the device as possible with the 0.01µF capacitor closest to the device pins. Traces Circuit board trace layout is very important to maintain the signal integrity of high-speed differential signals. VID OR (VIH - VIL) 0V DIFFERENTIAL IN tPHL tPLH VOH OUT VOD OR (VOH - VOL) VOL OUT 80% 80% +VOD OR +(VOH - VOL) DIFFERENTIAL OUTPUT WAVEFORM OUT - OUT 0V DIFFERENTIAL -VOD OR -(VOH - VOL) 20% tR 20% tF Figure 3. Differential Input-to-Output Propagation Delay Timing Diagram 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 50Ω 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. _______________________________________________________________________________________ 7 MAX9377/MAX9378 Anything-to-LVPECL/LVDS Translators with Pin-Selectable Divide-by-Four IN IN tPLH 1 OUT IN/4 tPCO 4 OUT tPCO RST SEL OUT tDR tSET tSEL Figure 4. Frequency Divider and Reset Timing Diagram Figure 5. Frequency Select Delay Timing Diagram Chip Information MAX9377 TRANSISTOR COUNT: 614 MAX9378 TRANSISTOR COUNT: 614 PROCESS: Bipolar 8 _______________________________________________________________________________________ Anything-to-LVPECL/LVDS Translators with Pin-Selectable Divide-by-Four 8 INCHES DIM A A1 A2 b E ÿ 0.50±0.1 H c D e E H 0.6±0.1 L 1 1 α 0.6±0.1 S BOTTOM VIEW D MIN 0.002 0.030 MAX 0.043 0.006 0.037 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 8LUMAXD.EPS 4X S 8 MILLIMETERS MAX MIN 0.05 0.75 1.10 0.15 0.95 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 A1 A2 A α c e b L SIDE VIEW FRONT VIEW PROPRIETARY INFORMATION TITLE: PACKAGE OUTLINE, 8L uMAX/uSOP APPROVAL DOCUMENT CONTROL NO. 21-0036 REV. J 1 1 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. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 9 © 2003 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. MAX9377/MAX9378 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.)