Maker : Semtech Corporation
Part No. : E118AHF

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Product Information

Edge118 Low Skew Clock Spreader EDGE HIGH-PERFORMANCE PRODUCTS Description The Edge118 is a fully differential 1:18 clock spreader. Manufactured in a high performance bipolar process, the Edge118 is designed to accurately fan out a multitude of clock signals with low channel to channel skew. Features • Low Timing Error vs. Duty Cycle & Frequency • Low Channel to Channel Skew • Small Footprint (64 MQFP Package, 14 mm X 14 mm Body) Functional Block Diagram OUT / OUT* 0 OUT / OUT* 1 OUT / OUT* 2 OUT / OUT* 3 OUT / OUT* 4 OUT / OUT* 5 OUT / OUT* 6 OUT / OUT* 7 OUT / OUT* 8 IN / IN* OUT / OUT* 9 OUT / OUT* 10 OUT / OUT* 11 OUT / OUT* 12 OUT / OUT* 13 OUT / OUT* 14 OUT / OUT* 15 OUT / OUT* 16 OUT / OUT* 17 Applications • Test Equipment Revision 1/August 15, 2000 1 www.semtech.com Edge118 EDGE HIGH-PERFORMANCE PRODUCTS PIN Description Pin Name IN, IN* OUT0, OUT0* OUT1, OUT1* OUT2, OUT2* OUT3, OUT3* OUT4, OUT4* OUT5, OUT5* OUT6, OUT6* OUT7, OUT7* OUT8, OUT8* OUT9, OUT9* OUT10, OUT10* OUT11, OUT11* OUT12, OUT12* OUT13, OUT13* OUT14, OUT14* OUT15, OUT15* OUT16, OUT16* OUT17, OUT17* Power Supplies GND Pin # 6, 8 1, 3 63, 61 58, 60 57, 55 52, 54 51, 49 45, 47 44, 42 39, 41 38, 36 33, 35 31, 29 26, 28 25, 23 20, 22 19, 17 13, 15 12, 10 Description Differential input signal. Differential ECL output signals. 2, 7, 11, 14, 18, 21, 24, 27, 30, 34, 37, 40, 43, 46, 50, 53, 56, 59, 62 Positive Power Supply VEE 9, 16, 32, 48, 64 Negative Power Supply TDP TDN , 4, 5 Thermal Diode Connections  2000 Semtech Corp. 2 www.semtech.com Edge118 EDGE HIGH-PERFORMANCE PRODUCTS PIN Description (continued) 64 OUT0 GND OUT0* TDP TDN IN GND IN* VEE OUT17* GND OUT17 OUT16 GND OUT16* VEE 17 1 OUT1* OUT2* GND OUT2 OUT3 GND OUT3* OUT4* GND OUT4 OUT5 GND OUT5* 49 VEE OUT6* GND OUT6 OUT7 GND OUT7* OUT8* GND OUT8 OUT9 GND OUT9* OUT10* GND OUT10 33 VEE OUT1 GND  2000 Semtech Corp. OUT14 GND OUT14* OUT13* GND OUT13 OUT12 GND OUT12* OUT11* GND OUT11 VEE 3 OUT15* GND OUT15 www.semtech.com Edge118 EDGE HIGH-PERFORMANCE PRODUCTS Circuit Description Chip Overview The Edge118 is a clock distribution chip designed to take one input signal (IN / IN*) and fan it out 18 times to identical outputs (OUT / OUT*). The chip is designed to minimize channel to channel skew and any timing jitter. The part’s wide fanout is extremely useful in applications where many distinct copies of a signal are required on one PC Board, and these signals must all be aligned. This signal can be distributed without creating a distribution tree using multiple devices. OUT 0 OUT 0* OUT 1 OUT 1* OUT 2 OUT 2* OUT 3 OUT 3* OUT 4 OUT 4* OUT 5 OUT 5* OUT 6 OUT 6* OUT 7 OUT 7* OUT 8 OUT 8* OUT 9 OUT 9* OUT 10 OUT 10* OUT 11 OUT 11* OUT 12 OUT 12* OUT 13 OUT 13* OUT 14 OUT 14* OUT 15 OUT 15* OUT 16 OUT 16* OUT 17 OUT 17* Inputs The input signal is differential, requiring 250 mV swings for full performance operation. The inputs are ECL compatible, but may also be operated over a common mode voltage range between VEE + 1.3V and VCC – .5V. Outputs The outputs are ECL compatible differential signals with 800 mV voltage swings centered around 1.3V below GND. IN IN* Operating Frequency The Edge118 is designed to maintain full performance up to at least 1000 MHz and pass 500 ps pulses.  2000 Semtech Corp. 4 www.semtech.com Edge118 EDGE HIGH-PERFORMANCE PRODUCTS Application Information Power Supplies Decoupling A .1 µF or .01 µF capacitor (with excellent high frequency characteristics, is recommended between GND and VEE. In addition, solid GND and VEE planes are recommended to provide a low inductance path for the power supply currents. Output Terminations For optimal results, all output pairs (used or unused) should be terminated, and terminated in the same manner. Thermal Information Parameter Thermal Resistance (300 LFM, par t soldered to a PC Board) Junction to Air Symbol Value Units θJA ~25 ˚C/W  2000 Semtech Corp. 5 www.semtech.com Edge118 ...

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