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CY25701 Datasheet(PDF) 2 Page - Cypress Semiconductor

Part No. CY25701
Description  Programmable High-Frequency Crystal Oscillator with Spread Spectrum (SSXO) and No-Spread Spectrum (XO) Option
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Maker  CYPRESS [Cypress Semiconductor]
Homepage  http://www.cypress.com
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CY25701 Datasheet(HTML) 2 Page - Cypress Semiconductor

   
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CY25701
Document #: 001-07313 Rev. *A
Page 2 of 8
Functional Description
The CY25701 is a Spread Spectrum Crystal Oscillator (SSXO)
IC used to reduce the EMI found in today’s high-speed digital
electronic systems.
The device uses a Cypress proprietary PLL and Spread
Spectrum Clock (SSC) technology to synthesize and modulate
the frequency of the embedded input crystal. By frequency
modulating the clock, the measured EMI at the fundamental
and harmonic frequencies are greatly reduced. This reduction
in radiated energy can significantly reduce the cost of
complying with regulatory agency (EMC) requirements and
improve time-to-market without degrading system perfor-
mance.
The CY25701 uses a programmable configuration memory
array to synthesize output frequency and spread%.
The spread% is programmed to either center spread or down
spread with various spread percentages. The range for center
spread is from ±0.25% to ±2.00%. The range for down spread
is from –0.5% to –4.0%. Contact the factory for smaller or
larger spread% amounts if required. Refer to Table 2 for
spread selection and no-spread values.
The frequency modulated SSCLK output can be programmed
from 10 to 166 MHz.
The CY25701 is available in a 4-pin ceramic SMD package
with an operating temperature range of –40 to 85°C.
Programming Description
Factory/Field Programmable CY25701
Factory/Field programming is available for samples and
manufacturing by Cypress and its distributors. All requests
must be submitted to the local Cypress Field Application
Engineer (FAE) or Sales Representative. Once the request
has been processed, you will receive a new part number,
samples, and data sheet with the programmed values. This
part number will be used for additional sample request and the
production orders. Contact your local Cypress FAE or sales
representative for details.
Additional information on the CY25701 can be obtained from
the Cypress web site at www.cypress.com.
Output Frequency, SSCLK Output (SSCLK, pin 3)
The modulated frequency at the SSCLK output is produced by
synthesizing from the embedded crystal oscillator frequency
input. The range of synthesized clock is from 10 to 166 MHz.
Spread Percentage (SSCLK, pin 3)
The SSCLK spread can be programmed to various spread
percentage values from ±0.25% to ±2.0% for Center Spread
and from –0.5% to –4.0% for Down Spread. Refer to Table 2
for available spread options. Enter ±0.0% (No spread) for XO
(Crystal Oscillator) without spread option.
Frequency Modulation (SSCLK, pin 3)
The default frequency modulation is programmed at 31.5 kHz
for all SSCLK frequencies from 10 to 166 MHz. Alternate
frequency modulations at 30.1 kHz or 32.9 kHz can be
selected via Cyberclocks software. Contact the factory for
other alternate modulation frequencies if required.
Pin Definition
Pin
Name
Description
1
OE
Output Enable pin: Active HIGH. If OE = 1, SSCLK is enabled
2
VSS
Power supply ground
3
SSCLK
Spread spectrum clock output (with or without spread)
4
VDD
3.3V power supply
Table 1. Programming Data Requirement
Pin Function
Output Frequency
Spread Percent Code[1]
Frequency Modulation
Pin Name
SSCLK
SSCLK
SSCLK
Pin#
3
3
3
Units
MHz
%
kHz
Program Value
ENTER DATA
ENTER DATA
31.5
Note
1. ±0.0% or Code “Z” for XO (No-Spread) option.
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