EDGE HIGH-PERFORMANCE PRODUCTS
1
www.semtech.com
Edge118
Low Skew
Clock Spreader
Description
Features
Functional Block Diagram
Applications
Revision 1/August 15, 2000
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.
Low Timing Error vs. Duty Cycle & Frequency
Low Channel to Channel Skew
Small Footprint (64 MQFP Package,
14 mm X 14 mm Body)
Test Equipment
IN / IN*
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
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
2
2000 Semtech Corp.
www.semtech.com
EDGE HIGH-PERFORMANCE PRODUCTS
Edge118
PIN Description
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3
2000 Semtech Corp.
www.semtech.com
EDGE HIGH-PERFORMANCE PRODUCTS
Edge118
PIN Description (continued)
VEE
OUT6*
GND
OUT6
OUT7
GND
OUT7*
OUT8*
GND
OUT8
OUT9
GND
OUT9*
OUT10*
GND
OUT10
OUT0
GND
OUT0*
TDP
TDN
IN
GND
IN*
VEE
OUT17*
GND
OUT17
OUT16
GND
OUT16*
VEE
VEE
OUT1
GND
OUT1*
OUT2*
GND
OUT2
OUT3
GND
OUT3*
OUT4*
GND
OUT4
OUT5
GND
OUT5*
OUT15*
GND
OUT15
OUT14
GND
OUT14*
OUT13*
GND
OUT13
OUT12
GND
OUT12*
OUT11*
GND
OUT11
VEE
64
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17
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4
2000 Semtech Corp.
www.semtech.com
EDGE HIGH-PERFORMANCE PRODUCTS
Edge118
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.
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.
Operating Frequenc
y
The Edge118 is designed to maintain full performance
up to at least 1000 MHz and pass 500 ps pulses.
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*
IN
IN*
5
2000 Semtech Corp.
www.semtech.com
EDGE HIGH-PERFORMANCE PRODUCTS
Edge118
Application Information
Power Supplies Decoupling
A .1
F or .01
F 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
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