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Kynix Part #: KY32-CY25811SCT
Manufacturer Part#:


Product Category: IC Chips
Manufacturer: CYPRESS
  datasheetCY25811SCT Datasheet
Package: SOP-8
Quantity: 96278 PCS
Lead Free Status / RoHS Status: Lead free / RoHS Compliant
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Manufacturer: CYPRESS
Product Category: IC Chips
Features, Applications


to 32-MHz input frequency range to 128-MHz output frequency range Accepts clock, crystal, and resonator inputs 1x, 2x, and 4x frequency multiplication: CY25814: 4x Center and down spread modulation Low power dissipation: = 52 mW-typ = 60 mW-typ = 72 mW-typ @ 24MHz Low cycle-to cycle jitter: 8 MHz = 450 ps-max 16 MHz = 225 ps-max 32 MHz = 150 ps-max Available in 8-pin SOIC and TSSOP packages Commercial and industrial temperature ranges


Printers and MFPs LCD panels Digital copiers PDAs Automotive CD-ROM, VCD, and DVD Networking, LAN/WAN Scanners Modems Embedded digital systems

Peak EMI reduction to 16 dB Fast time to market Cost reduction

Pin No. Name Xin/CLK VSS S1 S0 SSCLK FRSEL VDD XOUT Type Power supply ground. Digital Spread% control pin. 3-Level input (H-M-L). Default = M. Digital Spread% control pin. 3-Level input (H-M-L). Default = M. Spread Spectrum output clock. Input frequency range selection digital control input. 3-Level input (H-M-L). Default = M. Positive power supply. Crystal or ceramic resonator output pin. 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 available an 8-pin SOIC (150-mil.) package with a Commercial operating temperature range to 70°C and Industrial Temperature range to 85°C. Refer to CY25568 for multiple clock output options such as modulated and unmodulated clock outputs or Power-down function. Description Crystal, ceramic resonator or clock input pin.

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 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. 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 input frequency range to 32 MHz and accepts clock, crystal and ceramic resonator inputs. The output clock can be selected to produce or 4x multiplication of the input frequency with Spread Spectrum Frequency Modulation. The use or 4x frequency multiplication eliminates the need for higher order crystals and enables the user to generate 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 Table 2. Spread% Selection XIN (MHz) FRSEL = 0 CENTER = M CENTER = 1 CENTER

The CY25811/12/14 input frequency range to 32 MHz. This range is divided into three segments and controlled by 3-Level FRSEL pin as given in Table 1. Table 1. Input Frequency Selection FRSEL 1 M Input Frequency Range to 8.0 MHz to 16.0 MHz to 32.0 MHz

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.

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 (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.

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. Table 3. Modulation Rate Divider Ratios FRSEL 1 M Input Frequency Range (MHz) to 32 Divider Ratio (DR) 256 512

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 CY25814 (4x) determines the frequency multiplication at the output (SSCLK, Pin 5) with respect to input frequency (XIN, Pin-1).

Search Part number : "CY258" Included word is 15
Part Number Manufacturer Package Quantity Description
CY25814-SXC CY SOP8 3620
CY25823ZXC Cypress Semiconductor Corp 16-TSSOP (0.173", 4.40mm Width) 76 IC CLOCK DIFF SS 16-TSSOP
CY25823ZXCT Cypress Semiconductor Corp 16-TSSOP (0.173", 4.40mm Width) 3560 IC CLOCK DIFF SS 16-TSSOP
CY25812SXC Cypress Semiconductor Corp 8-SOIC (0.154", 3.90mm Width) 650 IC CLOCK GEN 3.3V SS 8-SOIC
CY25812SXCT Cypress Semiconductor Corp 8-SOIC (0.154", 3.90mm Width) 8282 IC CLOCK GEN 3.3V SS 8-SOIC
CY25823ZZC CY TSSOP16 1330
CY25812ZXC Cypress Semiconductor Corp 8-TSSOP (0.173", 4.40mm Width) 96500 IC CLOCK GEN 3.3V SS 8-TSSOP
CY25811SC CY 3.9mm-8P 6578
CY25814SCT CY SOP-8 10544
CY25814SXC Cypress Semiconductor Corp 8-SOIC (0.154", 3.90mm Width) 2237 IC CLOCK GEN 3.3V SS 8-SOIC
CY25811-SC CYPRESS SOP-8 1225
CY25814SXCT Cypress Semiconductor Corp 8-SOIC (0.154", 3.90mm Width) 5763 IC CLOCK GEN 3.3V SS 8-SOIC
CY25811SXC Cypress Semiconductor Corp 8-SOIC (0.154", 3.90mm Width) 4388 IC CLOCK GEN 3.3V SS 8-SOIC
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