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CY25814 Datasheet

Spread Spectrum Clock Generator

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Features
4 to 32 MHz input frequency range
4 to 128 MHz output frequency range
Accepts clock, crystal, and resonator inputs
1x, 2x, and 4x frequency multiplication:
CY25811: 1x; CY25812: 2x; CY25814: 4x
Center and down spread modulation
Low power dissipation:
3.3V = 52 mW - typ at 6 MHz
3.3V = 60 mW - typ at12 MHz
3.3V = 72 mW - typ at 24 MHz
Low cycle to cycle jitter:
8 MHz = 480 ps-max
16 MHz = 400 ps-max
32 MHz = 450 ps-max
Available in 8-pin SOIC and TSSOP packages
Commercial and industrial temperature ranges
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Spread Spectrum Clock Generator
Applications
Printers and MFPs
LCD panels
Digital copiers
PDAs
CD-ROM, VCD, and DVD
Networking, LAN, and WAN
Scanners
Modems
Embedded digital systems
Benefits
Peak EMI reduction by 8 to 16 dB
Fast time to market
Cost reduction
Logic Block Diagram
300K
XIN 1
8pF
XOUT 8
8pF
VDD 7
VSS 2
REFERENCE
DIVIDER
PD and
CP
LF
MODULATION
CONTROL
6
FRSEL
INPUT
DECODER
LOGIC
34
S1 S0
VCO
COUNTE
R
VCO
COUNTER
and 5
MUX SSCLK
Cypress Semiconductor Corporation • 198 Champion Court
Document Number: 38-07112 Rev. *G
• San Jose, CA 95134-1709 • 408-943-2600
Revised October 22, 2008
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Cypress Semiconductor Electronic Components Datasheet

CY25814 Datasheet

Spread Spectrum Clock Generator

No Preview Available !

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Pinouts
Figure 1. Pin Diagram - 8 Pin SOIC/TSSOP
XIN/CLKIN 1
8 XOUT
VSS 2
S1 3
CY25811
CY25812
CY25814
7 VDD
6 FRSEL
S0 4
5 SSCLK
Table 1. Pin Definition - 8 Pin SOIC/TSSOP
Pin No. Name Type
Description
1 Xin/CLK
Crystal, ceramic resonator or clock input pin
2 VSS
Power supply ground.
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
Positive power supply.
8 XOUT
Crystal or ceramic resonator output pin.
Functional Description
The CY25811/12/14 products are Spread Spectrum Clock
Generator (SSCG) ICs used for the purpose of reducing electro-
magnetic 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 significantly reduces the cost
of complying with regulatory agency requirements and improves
time to market without degrading system performance.
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.
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 reduces the cost while improving the system clock
accuracy, performance, and complexity.
The user selects Center Spread or Down Spread frequency
modulation based on four discrete values of 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 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 sheets.
Input Frequency Range and Selection
The CY25811/12/14 input frequency range is 4 to 32 MHz. This
range is divided into three segments and controlled by a 3-Level
FRSEL pin as given in Table 2.
Table 2. Input Frequency Selection
FRSEL
0
1
M
Input Frequency Range
4.0 to 8.0 MHz
8.0 to 16.0 MHz
16.0 to 32.0 MHz
Document Number: 38-07112 Rev. *G
Page 2 of 13
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Part Number CY25814
Description Spread Spectrum Clock Generator
Maker Cypress Semiconductor
Total Page 13 Pages
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