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Cypress CY25818 manual

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Table of contents for the manual

  • Page 1

    S pread S pectrum Clock Generato r CY25818/19 Cypress Semiconductor Corpora tion • 198 Champion Cou rt • San Jose , CA 95134-1 709 • 408-943-2 600 Document #: 38-07362 Rev . *B Revised April 1 1, 2006 Features • 8- to 32-MHz input frequency range • CY25818: 8–16 MHz • CY25819: 16–32 MHz • Sep arate modu lated and un mo du lated cl[...]

  • Page 2

    CY25818/19 Document #: 38-07362 Rev . *B Page 2 of 7 . Overvi ew The Cypress CY25818/1 9 products are S pread S pectrum Clock Generato r (SSCG) ICs used for the purpose of red ucing EMI found in today’s high-speed digital electronic systems. The devices use a Cypress proprietary phase-locked loop (PLL) and S pread S pectrum Clock (SSC) technolog [...]

  • Page 3

    CY25818/19 Document #: 38-07362 Rev . *B Page 3 of 7 3-Level Digit al Input s S0 digital input is designed to sense three logic l evels desig- nated as HIGH “1,” LOW “0 ,” and MIDDLE “M.” With this 3-Level d igit al input l ogic, th e 3-Level l ogic is a ble to detect three dif ferent log ic levels. The S0 pin includes an on-chip 20K (1[...]

  • Page 4

    CY25818/19 Document #: 38-07362 Rev . *B Page 4 of 7 Characteristics Curves The following curves demonstrat e the characteristic behavio r of the CY25818 /19 when tested over a numb er of environ- mental and application specific parameters. These are typical performance cu rves and are not meant to replace any parameter specified in Ta b l e 4 and [...]

  • Page 5

    CY25818/19 Document #: 38-07362 Rev . *B Page 5 of 7 SSCG Profiles CY25818/19 SSCG products us e a non-linear “optimized” frequency profile as shown in Fig ure 6 and Figure 7 . The use of Cypress proprietary “optimiz ed” freq uency profile maintains flat energy distribution over the fundamental and higher order harmonics. This results in ad[...]

  • Page 6

    CY25818/19 Document #: 38-07362 Rev . *B Page 6 of 7 © Cypress Semi con duct or Cor po rati on , 20 06 . The information con t a in ed he re i n is su bject to change wi t hou t n oti ce. C ypr ess S em ic onduct or Corporation assumes no resp onsibility f or the u se of any circuitry o ther than circui try embodied i n a Cypress prod uct. Nor doe[...]

  • Page 7

    CY25818/19 Document #: 38-07362 Rev . *B Page 7 of 7 Document History Page Document Title: CY25818/19 Spread S pectrum Clock Genera tor Document Number: 38-07362 REV . ECN NO. Issu e Date Orig. of Change Description of Cha nge ** 1 12462 03/21/02 OXC New Data Sheet *A 122701 12/28/02 RBI Added power up requirements to maximum rating information. *B[...]