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ABE0111 Datasheet(PDF) 4 Page - Abracon Corporation

Part No. ABE0111
Description  Low EMI Spread Spectrum Multiplier Clock
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Maker  ABRACON [Abracon Corporation]
Homepage  http://www.abracon.com/index.htm
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ABE0111 Datasheet(HTML) 4 Page - Abracon Corporation

   
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ABE0111
Low EMI Spread Spectrum Multiplier Clock
30332 Esperanza., Rancho Santa Margarita, Ca 92688 Ph: 949-546-8000 Fax: 949-546-8001 www.Abracon.com 03/21/05 Page 4
3. TIMING CHARACTERISTICS
PARAMETERS
SYMBOL
CONDITIONS
MIN.
TYP.
MAX.
UNITS
Rise Time
Tr
Measured at 0.8V ~ 2.0V @ 3.3V
0.8
0.95
1.1
ns
Fall Time
Tf
Measured at 2.0V ~ 0.8V @ 3.3V
0.78
0.85
0.9
ns
Output Duty Cycle
DT
45
50
55
%
Input to Output Delay
2
4
ns
Cycle to Cycle Jitter
Tcyc-cyc
Over output frequency range @ 3.3V
100
ps
FUNCTIONAL DESCRIPTION
Selectable spread spectrum and modulation rates
The ABE0111 provides selectable spread spectrum modulation, as well as selectable modulation rate. Selection
is made by connecting specific pins to a logical “zero” or “one”, according to the output clock selection table and
modulation rate selection table on page 1.
Pins 2 (S2), 3 (S1), 4 (S0), and 7 (S3) are used as inputs to select the spread spectrum modulation and
multiplication factor as shown on the output clock selection table (page 1).
Default values for S(0:3) through internal pull-up and pull-down resistor
Selection pins S0 and S3 have an internal pull-down resistor of 30k
Ω, pins 2 and 3 (S1 and S2) have an internal
pull-up resistor of 30k
Ω. This internal pull-up (or pull-down) resistor will pull the input value to a logical “one” (or
“zero” respectively) by default, i.e. when no resistive load is connected between the pin and GND (VDD
respectively). In order to override the internal pull-up (pull-down), the pin has to be connected to GND (VDD
respectively).


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