CY3724 Cypress Semiconductor Corp, CY3724 Datasheet - Page 2

• Manufacturer Part Number: CY3724
• Description: SOCKET ADAPTER FOR CY25701
• Manufacturer: Cypress Semiconductor Corp

Specifications of CY3724

• Accessory Type: Socket Adapter
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: CY3672, CY25701FJXC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

Pinout
Table 1. Pin Definitions - CY25701 4-Pin Ceramic SMD
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 significantly reduces the cost of complying with
regulatory
time-to-market without degrading system performance.
The CY25701 uses a programmable configuration memory array
to synthesize output frequency and spread percentage.
The spread percentage is programmed to 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 percentage amounts if required. See
for spread selection and no spread values.
The frequency modulated SSCLK output is programmable 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.
Document Number: 001-07313 Rev. *E
Pin
1
2
3
4
agency
(EMC)
SSCLK
Name
VDD
VSS
requirements
OE
Figure 1. Pin Diagram - CY25701 4-Pin Ceramic SMD
Table 3 on page 3
Output Enable pin: Active HIGH. If OE = 1, SSCLK is enabled
Power supply ground
Spread spectrum clock output (with or without spread)
3.3V power supply
and
improves
VDD
OE
4
1
Programming Description
Factory and Field Programmable CY25701
Factory and field programming is available for samples and
manufacturing by Cypress and its distributors. Submit your
request to the local Cypress Field Application Engineer (FAE) or
sales representative. Once the request is processed, you receive
a new part number, samples, and data sheet with the
programmed values. This part number is used for additional
sample request and the production orders. Contact your local
Cypress FAE or sales representative for details.
Additional information on the CY25701 is available at the
Cypress web site 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 is programmable to various spread
percentage values from ±0.25% to ±2.0% for center spread and
from –0.5% to –4.0% for down spread. See
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 are selectable using
CyberClocks™ Online software. Contact the factory for other
alternate modulation frequencies if required.
SSCLK
VSS
3
2
Description
Table 3 on page 3
CY25701
Page 2 of 9
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