CY25811/12/14 Spread Spectrum Clock Generator Features Applications • 4- to 32-MHz input frequency range • Printers and MFPs • 4- to 128-MHz output frequency range • LCD panels • Accepts clock, crystal, and resonator inputs • Digital copiers • 1x, 2x, and 4x frequency multiplication: • PDAs — CY25811: 1x; CY25812: 2x; CY25814: 4x • CD-ROM, VCD, and DVD • Center and down spread modulation • Networking, LAN/WAN • Low power dissipation: • Scanners — 3.3V = 52 mW-typ @ 6MHz • Modems — 3.3V = 60 mW-typ @ 12MHz • Embedded digital systems — 3.3V = 72 mW-typ @ 24MHz Benefits • Low cycle-to cycle jitter: — 8 MHz = 450 ps-max • Peak EMI reduction by 8 to 16 dB — 16 MHz = 225 ps-max • Fast time to market — 32 MHz = 150 ps-max • Cost reduction • Available in 8-pin SOIC and TSSOP packages • Commercial and industrial temperature ranges Block Diagram Pin Configuration 300K XIN/CLKIN 1 REFERENCE DIVIDER XIN 1 8pF XOUT PD and CP VSS 2 8 8pF VCO COUNTE R MODULATION CONTROL S1 3 VCO VDD 7 VSS 2 6 3 4 FRSEL S1 S0 Cypress Semiconductor Corporation Document #: 38-07112 Rev. *D CY25811 CY25812 CY25814 S0 4 INPUT DECODER LOGIC COUNTER and MUX • 8 XOUT 7 VDD 6 FRSEL 5 SSCLK LF 5 SSCLK 3901 North First Street 8-pin SOIC/TSSOP • San Jose, CA 95134 • 408-943-2600 Revised December 22, 2003 CY25811/12/14 Pin Description Pin No. Name Type Description 1 Xin/CLK 2 VSS 3 S1 Digital Spread% control pin. 3-Level input (H-M-L). Default = M. 4 S0 Digital Spread% control pin. 3-Level input (H-M-L). Default = M. 5 SSCLK Spread Spectrum output clock. 6 FRSEL Input frequency range selection digital control input. 3-Level input (H-M-L). Default = M. 7 VDD 8 XOUT Crystal, ceramic resonator or clock input pin. Power supply ground. Positive power supply. Crystal or ceramic resonator output pin. General Description Spread % for each Spread Mode with the option of a Non-Spread mode for system test and verification purposes. The CY25811/12/14 products are Spread Spectrum Clock Generator (SSCG) ICs used for the purpose of reducing electromagnetic interference (EMI) found in today’s high-speed digital electronic systems. The CY25811/12/14 products are available in an 8-pin SOIC (150-mil.) package with a Commercial operating temperature range of 0 to 70°C and Industrial Temperature range of –40 to 85°C. Refer to CY25568 for multiple clock output options such as modulated and unmodulated clock outputs or Power-down function. For Automotive applications, refer to CY25811/12/14SE data sheet. The devices use a Cypress proprietary phase-locked loop (PLL) and Spread Spectrum Clock (SSC) technology to synthesize and modulate the frequency of the input clock. By frequency modulating the clock, the measured EMI at the fundamental and harmonic frequencies is greatly reduced. Input Frequency Range and Selection This reduction in radiated energy can significantly reduce the cost of complying with regulatory agency requirements and improve time to market without degrading system performance. The CY25811/12/14 input frequency range is 4 to 32 MHz. This range is divided into three segments and controlled by 3-Level FRSEL pin as given in Table 1. The input frequency range is 4 to 32 MHz and accepts clock, crystal and ceramic resonator inputs. The output clock can be selected to produce 1x, 2x, or 4x multiplication of the input frequency with Spread Spectrum Frequency Modulation. Table 1. Input Frequency Selection The use of 2x or 4x frequency multiplication eliminates the need for higher order crystals and enables the user to generate up to 128-MHz Spread Spectrum Clock (SSC) by using only first order crystals. This will reduce the cost while improving the system clock accuracy, performance and complexity. Center Spread or Down Spread frequency modulation can be selected by the user based on four discrete values of FRSEL Input Frequency Range 0 4.0 to 8.0 MHz 1 8.0 to 16.0 MHz M 16.0 to 32.0 MHz Spread% Selection The CY25811/12/14 SSCG products provide Center-Spread, Down-Spread and No-Spread functions. The amount of Spread% is selected by using 3-Level S0 and S1 digital inputs and Spread% values are given in Table 2. Table 2. Spread% Selection XIN (MHz) FRSEL S1 = 0 S0 = 0 S1 = 0 S0 = M S1 = 0 S0 = 1 S1 = M S0 = 0 S1 = 1 S0 = 1 S1 = 1 S0 = 0 S1 = M S0 = 1 S1 = 1 S0 = M S1 = M S0 = M Center (%) Center (%) Center (%) Center (%) Down (%) Down (%) Down (%) Down (%) No Spread 4-5 0 ±1.4 ± 1.2 ± 0.6 ± 0.5 –3.0 –2.2 –1.9 –0.7 0 5-6 0 ±1.3 ± 1.1 ± 0.5 ± 0.4 –2.7 –1.9 –1.7 –0.6 0 6-7 0 ±1.2 ± 0.9 ± 0.5 ± 0.4 –2.5 –1.8 –1.5 –0.6 0 7-8 0 ±1.1 ± 0.9 ± 0.4 ± 0.3 –2.3 –1.7 –1.4 –0.5 0 8-10 1 ±1.4 ±1.2 ± 0.6 ± 0.5 –3.0 –2.2 –1.9 –0.7 0 10-12 1 ±1.3 ±1.1 ± 0.5 ± 0.4 –2.7 –1.9 –1.7 –0.6 0 12-14 1 ±1.2 ± 0.9 ± 0.5 ± 0.4 –2.5 –1.8 –1.5 –0.6 0 14-16 1 ±1.1 ± 0.9 ± 0.4 ± 0.3 –2.3 –1.7 –1.4 –0.5 0 16-20 M ±1.4 ±1.2 ± 0.6 ± 0.5 –3.0 –2.2 –1.9 –0.7 0 Document #: 38-07112 Rev. *D Page 2 of 10 CY25811/12/14 Table 2. Spread% Selection (continued) XIN (MHz) FRSEL S1 = 0 S0 = 0 S1 = 0 S0 = M S1 = 0 S0 = 1 S1 = M S0 = 0 S1 = 1 S0 = 1 S1 = 1 S0 = 0 S1 = M S0 = 1 S1 = 1 S0 = M S1 = M S0 = M 20-24 M ±1.3 ±1.1 ± 0.5 ± 0.4 –2.7 –1.9 –1.7 –0.6 0 24-28 M ±1.2 ± 0.9 ± 0.5 ± 0.4 –2.5 –1.8 –1.5 –0.6 0 28-32 M ±1.1 ± 0.9 ± 0.4 ± 0.3 –2.3 –1.7 –1.4 –0.5 0 3-Level Digital Inputs S0, S1, and FRSEL digital inputs are designed to sense 3 different logic levels designated as High “1”, Low “0” and Middle “M”. With this 3-Level digital input logic, the 3-Level Logic is able to detect 9 different logic states. S0, S1 and FRSEL pins include an on chip 20K (10K/10K) resistor divider. No external application resistors are needed to implement the 3-Level logic levels as shown below: Logic Level “0”: 3–Level logic pin connected to GND. Logic Level “M”: 3–Level logic pin left floating (no connection). Logic Level “1”: 3–Level logic pin connected to VDD. Figure 1 illustrates how to implement 3–Level Logic. LOGIC MIDDLE (M) LOGIC LOW (0) LOGIC HIGH (H) S0, S1 and FRSEL UNCONNECTED S0, S1 and FRSEL to VSS S0, S1 and FRSEL to VDD VSS Figure 1. 3–Level Logic Modulation Rate Spread Spectrum Clock Generators utilize frequency modulation (FM) to distribute energy over a specific band of frequencies. The maximum frequency of the clock (fmax) and minimum frequency of the clock (fmin) determine this band of frequencies. The time required to transition from fmin to fmax and back to fmin is the period of the Modulation Rate. The Modulation Rate of SSCG clocks are generally referred to in terms of frequency, or fmod = 1/Tmod. The input clock frequency, fin, and the internal divider determine the Modulation Rate. In the case of CY25811/2/4 devices, the (Spread Spectrum) modulation Rate, fmod, is given by the following formula: fmod = fin/DR where; fmod is the Modulation Rate, fin is the Input Frequency and DR is the Divider Ratio as given in Table 3. Notice that Input Frequency Range is set by FRSEL. Document #: 38-07112 Rev. *D Table 3. Modulation Rate Divider Ratios Input Frequency Range (MHz) Divider Ratio (DR) 0 4 to 8 128 1 8 to 16 256 M 16 to 32 512 FRSEL Input and Output Frequency Selection The relationship between input frequency versus output frequency in terms of device selection and FRSEL setting is given in Table 4. As shown, the input frequency range is selected by FRSEL and is the same for CY25811, CY25812, and CY25814. The selection of CY25811 (1x), CY25812 (2x) or CY25814 (4x) determines the frequency multiplication at the output (SSCLK, Pin 5) with respect to input frequency (XIN, Pin-1). Page 3 of 10 CY25811/12/14 Table 4. Input and Output Frequency Selection Input Frequency Range (MHz) FRSEL Product Multiplication Output Frequency Range (MHz) 4 to 8 0 CY25811 1x 4 to 8 8 to 16 1 CY25811 1x 8 to 16 16 to 32 M CY25811 1x 16 to 32 4 to 8 0 CY25812 2x 8 to 16 8 to 16 1 CY25812 2x 16 to 32 16 to 32 M CY25812 2x 32 to 64 4 to 8 0 CY25814 4x 16 to 32 8 to 16 1 CY25814 4x 32 to 64 16 to 32 M CY25814 4x 64 to 128 Absolute Maximum Conditions (both Commercial and Industrial Grades)[1,2] Parameter Description VDD Supply Voltage Condition Min. Max. Unit –0.5 4.6 V VIN Input Voltage Relative to V SS –0.5 VDD + 0.5 VDC TS Temperature, Storage Non Functional –65 150 °C TA1 Temperature, Operating Ambient Functional, C-Grade 0 70 °C TA2 Temperature, Operating Ambient Functional, I-Grade –40 85 °C TJ Temperature, Junction Functional – 150 °C ESDHBM ESD Protection (Human Body Model) MIL-STD-883, Method 3015 2000 – V UL-94 Flammability Rating MSL Moisture Sensitivity Level @1/8 in. V–0 1 DC Electrical Specifications (Commercial Grade) Parameter Description VDD 3.3 Operating Voltage Condition 3.3 ± 5% Min. Max. Unit 3.135 3.465 V 0 0.15VDD V 0.40VDD 0.60VDD 0.85VDD VDD V VIL Input Low Voltage S0, S1 and FRSEL Inputs VIM Input Middle Voltage S0, S1 and FRSEL Inputs VIH Input High Voltage S0, S1 and FRSEL Inputs VOL1 Output Low Voltage IOL = 4 ma, SSCLK Output VOL2 Output Low Voltage VOH1 Output High Voltage VOH2 Output High Voltage IOH = 6 ma, SSCLK Output 2.0 – V CIN1 Input Pin Capacitance XIN (Pin 1) and XOUT (Pin 8) 6.0 9.0 pF CIN2 Input Pin Capacitance All Digital Inputs 3.5 6.0 pF CL Output Load Capacitor SSCLK Output – 15 pF IDD1 Dynamic Supply Current Fin = 12 MHz, no load – 25 mA IDD2 Dynamic Supply Current Fin = 24 MHz, no load – 30 mA IDD3 Dynamic Supply Current Fin = 32 MHz, no load – 35 mA V – 0.4 V IOL = 10 ma, SSCLK Output – 1.2 V IOH = 4 ma, SSCLK Output 2.4 – V Notes: 1. Operation at any Absolute Maximum Rating is not implied. 2. Single Power Supply: The voltage on any input or I/O pin cannot exceed the power pin during power up. Document #: 38-07112 Rev. *D Page 4 of 10 CY25811/12/14 AC Electrical Specifications (Commercial Grade) Condition Min. Max. Unit FIN Parameter Input Frequency Range Description Clock, Crystal or Ceramic Resonator Input 4 32 MHz TR1 Clock Rise Time SSCLK, CY25811 and CY25812 2.0 5.0 ns TF1 Clock Fall Time SSCLK, CY25811 and CY25812 2.0 4.4 ns TR2 Clock Rise Time SSCLK, only CY25814 when FRSEL = M 1.0 2.2 ns TF2 Clock Fall Time SSCLK, only CY25814 when FRSEL = M 1.0 2.2 ns TDCIN Input Clock Duty Cycle XIN 40 60 % TDCOUT Output Clock Duty Cycle SSCLK 40 60 % TCCJ1 Cycle-to-Cycle Jitter, Spread on Fin = 4 MHz, Fout = 4 MHz, CY25811 – 800 ps TCCJ2 Cycle-to-Cycle Jitter, Spread on Fin = 8 MHZ, Fout = 8 MHz, CY25811 – 450 ps TCCJ3 Cycle-to-Cycle Jitter, Spread on Fin = 8 MHz, Fout = 16 MHz, CY25812 – 400 ps TCCJ4 Cycle-to-Cycle Jitter, Spread on Fin = 16 MHz, Fout = 32 MHz, CY25812 – 380 ps TCCJ5 Cycle-to-Cycle Jitter, Spread on Fin = 16 MHz, Fout = 64 MHz, CY25814 – 380 ps TCCJ6 Cycle-to-Cycle Jitter, Spread on Fin = 32 MHz, Fout = 128 MHz, CY25814 – 380 ps TSU PLL Lock Time Fom VDD 3.0V to valid SSCLK – 3 ms Min. Max. Unit 3.135 3.465 V 0 0.13VDD V DC Electrical Specifications (Industrial Grade) Parameter Description Condition VDD 3.3 Operating Voltage 3.3 ± 5% VIL Input Low Voltage S0, S1 and FRSEL Inputs VIM Input Middle Voltage S0, S1 and FRSEL Inputs 0.40VDD 0.60VDD V VIH Input High Voltage S0, S1 and FRSEL Inputs 0.85VDD VDD V VOL1 Output Low Voltage IOL = 4 ma, SSCLK Output – 0.4 V VOL2 Output Low Voltage IOL = 10 ma, SSCLK Output – 1.2 V VOH1 Output High Voltage IOH = 4 ma, SSCLK Output 2.4 – V VOH2 Output High Voltage IOH = 6 ma, SSCLK Output 2.0 – V CIN1 Input Pin Capacitance XIN (Pin 1) and XOUT (Pin 8) 6.0 9.0 pF CIN2 Input Pin Capacitance All Digital Inputs 3.5 6.0 pF CL Output Load Capacitor SSCLK Output – 15 pF IDD1 Dynamic Supply Current Fin = 12 MHz, no load – 26 mA IDD2 Dynamic Supply Current Fin = 24 MHz, no load – 32 mA IDD3 Dynamic Supply Current Fin = 32 MHz, no load – 37 mA Min. Max. Unit AC Electrical Specifications (Industrial Grade) Parameter Description Condition FIN Input Frequency Range Clock, Crystal or Ceramic Resonator Input 4 32 MHz TR1 Clock Rise Time SSCLK, CY25811 and CY25812 2.0 5.0 ns TF1 Clock Fall Time SSCLK, CY25811 and CY25812 2.0 4.4 ns TR2 Clock Rise Time SSCLK, only CY25814 when FRSEL = M 1.0 2.2 ns TF2 Clock Fall Time SSCLK, only CY25814 when FRSEL = M 1.0 2.2 ns TDCIN Input Clock Duty Cycle XIN 40 60 % TDCOUT Output Clock Duty Cycle SSCLK 40 60 % TCCJ1 Cycle-to-Cycle Jitter, Spread on Fin = 6MHz, CY25811/12/14 – 650 ps TCCJ2 Cycle-to-Cycle Jitter, Spread on Fin = 12MHZ, CY25811/12/14 – 400 ps TCCJ3 Cycle-to-Cycle Jitter, Spread on Fin = 24MHz, CY25811/12/14 – 400 ps TSU PLL Lock Time From VDD 3.0V to valid SSCLK – 4 ms Document #: 38-07112 Rev. *D Page 5 of 10 CY25811/12/14 Characteristic Curves The following curves demonstrate the characteristic behavior of the CY25811/12/14 when tested over a number of environmental and application-specific parameters. These are typical performance curves and are not meant to replace any parameter specified in DC and AC Specification tables. 600 2.75 6.0 MHz 32.0 MHz 500 2.5 BW % CCJ (ps) 400 300 2.25 200 2 100 1.75 0 4 8 12 16 20 24 28 32 -40 -25 -10 5 20 Jitter vs. Input Frequency (No Load) FRSEL = M 16 - 32 MHz BW (%) IDD (mA) 24 FRSEL = 1 8 - 16 MHz 20 18 16 FRSEL = 0 4 - 8 MHz 14 12 10 4 4.5 5 5.5 6 65 80 95 110 125 3 2.9 2.8 2.7 28 22 50 Bandwidth % vs. Temperature 30 26 35 Temp (C) Input Frequency (MHz) 6.5 7 7.5 8 2.6 2.5 2.4 2.3 2.2 2.1 2 1.9 1.8 2.8 4.0 MHz 8.0 MHz 2.9 Frequency (MHz), no load, normalized to FRSEL = 0, (4 - 8 MHz). IDD vs. Frequency (FRSEL = 0, 1, M) 3 3.1 3.2 3.3 3.4 3.5 3.6 3.7 VDD (volts) Bandwidth % vs. VDD Figure 2. Characteristic Curves Document #: 38-07112 Rev. *D Page 6 of 10 CY25811/12/14 SSCG Profiles CY25811/12/14 SSCG products use a non-linear “optimized” frequency profile as shown In Figure 3. The use of Cypress proprietary “optimized” frequency profile maintains flat energy distribution over the fundamental and higher order harmonics. This results in additional EMI reduction in electronic systems. Xin = 6.0 MHz S1, S0 = 0 FRSEL = 0 Xin = 12.0 MHz S1, S0 = 0 FRSEL = 1 SSCLK1 = 6.0 MHz P/N = CY25811 SSCLK1 = 48.0 MHz P/N = CY25814 Xin = 24.0 MHz S1, S0 = 0 FRSEL = M Xin = 24.0 MHz S1, S0 = 0 FRSEL = M SSCLK1 = 24.0 MHz P/N = CY25811 SSCLK1 = 96.0 MHz P/N = CY25814 Figure 3. Spread Spectrum Profiles (Frequency vs. Time) Document #: 38-07112 Rev. *D Page 7 of 10 CY25811/12/14 Application Schematic VDD C3 0.1 uF 7 C2 1 XIN VDD 5 27 pF Y1 25 MHz 8 C3 SSCLK 25 MHz (CY25811) 50 MHz (CY25812) 100 MHz (CY25814) XOUT 27 pF CY25811 CY25812 CY25814 3 S1 6 N/C FRSEL S0 4 VSS 2 Ordering Information Part Number Package Type Product Flow CY25811SC 8-pin SOIC Commercial, 0° to 70°C CY25811SCT 8-pin SOIC – Tape and Reel Commercial, 0° to 70°C CY25811SI 8-pin SOIC Industrial, –40° to 85°C CY25811SIT 8-pin SOIC – Tape and Reel Industrial, –40° to 85°C CY25811ZC 8-pin TSSOP Commercial, 0° to 70°C CY25811ZCT 8-pin TSSOP – Tape and Reel Commercial, 0° to 70°C CY25812SC 8-pin SOIC Commercial, 0° to 70°C CY25812SCT 8-pin SOIC – Tape and Reel Commercial, 0° to 70°C CY25812SI 8-pin SOIC Industrial, –40° to 85°C CY25812SIT 8-pin SOIC – Tape and Reel Industrial, –40° to 85°C CY25812ZC 8-pin TSSOP Commercial, 0° to 70°C CY25812ZCT 8-pin TSSOP – Tape and Reel Commercial, 0° to 70°C CY25814SC 8-pin SOIC Commercial, 0° to 70°C CY25814SCT 8-pin SOIC – Tape and Reel Commercial, 0° to 70°C CY25814SI 8-pin SOIC Industrial, –40° to 85°C CY25814SIT 8-pin SOIC – Tape and Reel Industrial, –40° to 85°C CY25814ZC 8-pin TSSOP Commercial, 0° to 70°C CY25814ZCT 8-pin TSSOP – Tape and Reel Commercial, 0° to 70°C Document #: 38-07112 Rev. *D Page 8 of 10 CY25811/12/14 Package Drawing and Dimensions 8-lead (150-Mil) SOIC S8 PIN 1 ID 4 1 1. DIMENSIONS IN INCHES[MM] MIN. MAX. 2. PIN 1 ID IS OPTIONAL, ROUND ON SINGLE LEADFRAME RECTANGULAR ON MATRIX LEADFRAME 0.150[3.810] 0.157[3.987] 3. REFERENCE JEDEC MS-012 0.230[5.842] 0.244[6.197] 4. PACKAGE WEIGHT 0.07gms PART # S08.15 STANDARD PKG. 5 SZ08.15 LEAD FREE PKG. 8 0.189[4.800] 0.196[4.978] 0.010[0.254] 0.016[0.406] SEATING PLANE X 45° 0.061[1.549] 0.068[1.727] 0.004[0.102] 0.050[1.270] BSC 0.004[0.102] 0.0098[0.249] 0°~8° 0.016[0.406] 0.035[0.889] 0.0075[0.190] 0.0098[0.249] 51-85066-*C 0.0138[0.350] 0.0192[0.487] 8-Lead Thin Shrunk Small Outline Package (4.40 MM Body) Z8 PIN 1 ID 1 6.25[0.246] 6.50[0.256] 4.30[0.169] 4.50[0.177] 8 0.65[0.025] BSC. 0.19[0.007] 0.30[0.012] 1.10[0.043] MAX. 0.25[0.010] BSC GAUGE PLANE 0°-8° 0.076[0.003] 0.85[0.033] 0.95[0.037] 2.90[0.114] 3.10[0.122] 0.05[0.002] 0.15[0.006] SEATING PLANE 0.50[0.020] 0.70[0.027] 0.09[[0.003] 0.20[0.008] 51-85093-*A Intel and Pentium are registered trademarks of Intel Corporation. All product and company names mentioned in this document are the trademarks of their respective holders. Document #: 38-07112 Rev. *D Page 9 of 10 © Cypress Semiconductor Corporation, 2003. The information contained herein is subject to change without notice. Cypress Semiconductor Corporation assumes no responsibility for the use of any circuitry other than circuitry embodied in a Cypress Semiconductor product. Nor does it convey or imply any license under patent or other rights. Cypress Semiconductor does not authorize its products for use as critical components in life-support systems where a malfunction or failure may reasonably be expected to result in significant injury to the user. The inclusion of Cypress Semiconductor products in life-support systems application implies that the manufacturer assumes all risk of such use and in doing so indemnifies Cypress Semiconductor against all charges. CY25811/12/14 Document History Page Document Title: CY25811/12/14 Spread Spectrum Clock Generator Document Number: 38-07112 REV. ECN NO. Issue Date Orig. of Change Description of Change ** 107516 06/14/02 NDP Converted from IMI to Cypress *A 108002 06/29/02 NDP Deleted Junction Temp. in Absolute Maximum Ratings *B 121578 01/29/03 RGL Converted from Word to FrameMaker Added 8-pin TSSOP package in Commercial Temp. only Added an Industrial Temperature Range to all existing 8-pin SOIC packages *C 125550 05/14/03 RGL Changed IDD values from 19.6/22/27.2 to 25/30/35 in Commercial Grade DC Specs table Changed IDD values from 24/26.5/33 to 26/32/37 in Industrial grade DC Specs table Changed TCCJ1/2 values from 675/260 to 800/450 in Commercial grade AC Specs table Changed TCCJ1 value from 350 to 650 in Industrial grade AC Specs table *D 131941 12/24/03 RGL Removed automotive in the Applications section Changed the Output Clock Duty Cycle (TDCOUT) from min. 45 and max. 55 to 40 and 60% respectively for both industrial and commercial grade Changed the min. Input Low Voltage (VIL) from 0.15VDD to 0.13VDD Removed preliminary from the industrial AC/DC Electrical Specifications table Document #: 38-07112 Rev. *D Page 10 of 10