Instruction/ maintenance manual of the product CY25566 Cypress
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S pread S pectrum Clock Generator CY25566 Cypress Semiconductor Corpora tion • 3901 North First S treet • San Jose • CA 95134 • 408-943 -2600 Document #: 38-07429 Rev .
CY25566 Document #: 38-07429 Rev . *B Page 2 of 9 General Description The Cypress CY25566 is a S pread S pectrum Clock Generator (SSCG) IC used for the purpose of reducin g electromagnetic interference (EMI) found in today’s high-speed digital electronic systems.
CY25566 Document #: 38-07429 Rev . *B Page 3 of 9 SSCLK1a/b SSCLK1a and SSCLK1b are spread spectrum clock outp uts used for the purpose of reducing EMI in digital systems. SSCLK1a and SSCLK1b ca n be connected in severa l different ways to provide flexibility in application desig ns.
CY25566 Document #: 38-07429 Rev . *B Page 4 of 9 Modulation Rate S pread S pectrum clock generators utilize frequency modulation (FM) to distribute e nergy over a specific band of frequencies. The maximum freque ncy of the clock (Fmax) and minimum frequency of the clock (Fmin) determine this band of frequencies.
CY25566 Document #: 38-07429 Rev . *B Page 5 of 9 T able 1. Frequency and Band width Selection Chart (Grou p 1)(Lo w Frequency (1x) Selection Ch art) 25–50 MHz (Low Range) XIN/CLK (MHz) S1 = M S0 = M S1 = M S0 = 0 S1 = 1 S0 = 0 S1 = 0 S0 = 0 S1 = 0 S0 = M 25–35 4.
CY25566 Document #: 38-07429 Rev . *B Page 6 of 9 Application Schematic In this example, the CY255 66 is being driven by a 75-MHz reference clock. S0 = 0 and S1 = 0 are programmed to select a BW of 2.5%. (Refer to Ta b l e 1 and 2. ) S2 = 0 and S3 = 1 are programmed to select the Group 2 range.
CY25566 Document #: 38-07429 Rev . *B Page 7 of 9 Absolute Maximum Ratings [1, 2] Supply V oltage (V DD : ................. ........... .............. ............ .+6V Operating T emperature: ........ .............. .............. .. 0°C to 70°C S torage T emperature .
CY25566 Document #: 38-07429 Rev . *B Page 8 of 9 © Cypress Semico nductor Corpor ation, 2002. Th e information cont ained herein is subject to chan ge without not ice. Cypress Semico nductor Corporation assumes no respon sibility for the use of any circ uitry other than cir cuitry embodied i n a Cypress Semi conductor product.
CY25566 Document #: 38-07429 Rev . *B Page 9 of 9 Document Title:CY25566 Spread S pectrum Clock Generator Document Number: 38 -07429 Rev . ECN No. Issue Date Orig. of Change Description of Ch an ge ** 1 15771 07/01/02 OXC Ne w Data Sheet *A 122705 12/30/02 RBI Added power up require ments to maximum ratings information.
An important point after buying a device Cypress CY25566 (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Cypress CY25566 yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Cypress CY25566 - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Cypress CY25566 you will learn all the available features of the product, as well as information on its operation. The information that you get Cypress CY25566 will certainly help you make a decision on the purchase.
If you already are a holder of Cypress CY25566, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Cypress CY25566.
However, one of the most important roles played by the user manual is to help in solving problems with Cypress CY25566. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Cypress CY25566 along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
