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LV3344BE-70.0M Datasheet(PDF) 5 Page - Pletronics, Inc. |
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LV3344BE-70.0M Datasheet(HTML) 5 Page - Pletronics, Inc. |
5 / 5 page Mar 2004 (425) 776 -1880, Fax: (425) 776-2760, ple-sales@pletronics.com, www.pletronics.com 6A Pl tronics, Inc. PECL and LVDS Layout Guidelines Continued Pl tronics, Inc. 19013 36th Ave. W, Suite H Lynnwood, WA 98036 USA Manufacturer of High Quality Frequency Control Products . Vcc Vcc - 2.00 V GND Out Vcc Oscillator Vcc GND Out Vcc Oscillator PECL Terminations: LVDS Terminations: Mixed System Power Supply: 50 ohm Vcc GND Out Vcc Oscillator R load Vcc GND Q Out QN Out Vcc Oscillator 100 ohm R1 R2 Suggested Terminations for 50 ohm impedance matched termination Simple termination for NON impedance matched termination Vcc 5.0 V 3.3 V 2.5 V R1 82 ohm 130 ohm 249 ohm Vcc 5.0 V 3.3 V 2.5 V R load 274 ohm 147 ohm 86.6 ohm R2 130 ohm 82 ohm 61.9 ohm Thevenin Equivalent Termination Design PCB traces for 50 ohm characteristic impedance To use multiple supply voltages requires level translation. Direct circuit connection is not valid. Mixed supply voltages are allowed. No translation is necessary. (ECL is returned to the most positive supply and this is common to all circuits) Mixed supply voltages are allowed. LVDS signal levels are power supply independent. 3.3 V LVDS oscillators properly interface 2.5 V Logic Arrays for example. PECL ECL LVDS |
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