CY25819_11 CYPRESS [Cypress Semiconductor], CY25819_11 Datasheet

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CY25819_11

Manufacturer Part Number
CY25819_11
Description
Spread Spectrum Clock Generator 8- to 32-MHz input frequency range
Manufacturer
CYPRESS [Cypress Semiconductor]
Datasheet
Spread Spectrum Clock Generator
Features
Cypress Semiconductor Corporation
Document #: 38-07362 Rev. *D
Block Diagram
8- to 32-MHz input frequency range
CY25819: 16 MHz to 32 MHz
Separate modulated and unmodulated clocks
Accepts clock, crystal, and resonator inputs
Down spread modulation
Power-down function
Low-power dissipation
Low cycle-to-cycle jitter
Available in 8-pin (150 mil) SOIC package
CY25819 = 36 mW typ at 16 MHz
CY25819 = 63 mW typ at 32 MHz
SSCLK = 250 ps typ
REFOUT = 275 ps typ
XIN/CLKIN
XOUT
VDD
VSS
1
8
7
2
300K
198 Champion Court
MODULATION
REFERENCE
DECODER
CONTROL
Spread Spectrum Clock Generator
DIVIDER
S0 PD#
INPUT
3
Applications
Benefits
6
Printers and MFPs
LCD panels and notebook PCs
Digital copiers
PDAs
Automotive
CD-ROM, VCD, and DVD
Networking and LAN/WAN
Scanners
Modems
Embedded digital systems
Peak electromagnetic interference (EMI) reduction by 8 dB to
16 dB
Fast time to market
Cost reduction
San Jose
COUNTER
PD and
VCO
CP
,
CA 95134-1709
DIVIDER
MUX
and
VCO
LF
4
5
Revised May 10, 2011
REFCLK
SSCLK
CY25819
408-943-2600
[+] Feedback

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CY25819_11 Summary of contents

Page 1

Spread Spectrum Clock Generator Features 8- to 32-MHz input frequency range ■ CY25819: 16 MHz to 32 MHz ■ Separate modulated and unmodulated clocks ■ Accepts clock, crystal, and resonator inputs ■ Down spread modulation ■ Power-down function ■ Low-power ...

Page 2

Contents Pin Configuration ............................................................. 3 Pin Description ................................................................. 3 Overview ............................................................................ 4 Input Frequency Range and Selection ........................... 4 Spread% Selection ........................................................... 4 3-Level Digital Inputs ....................................................... 5 Modulation Rate ................................................................ 5 Maximum Ratings ............................................................. 6 DC Electrical Characteristics .......................................... ...

Page 3

Pin Configuration Pin Description Pin Name 1 XIN/CLK Clock, Crystal, or Ceramic Resonator Input Pin. 2 Vss Power Supply Ground Digital Spread% Control Pin. 3-Level input (H-M-L). Default = M. Modulated Spread Spectrum Output Clock. The output frequency ...

Page 4

Overview The Cypress CY25819 products are Spread Spectrum Clock Generator (SSCG) ICs used for the purpose of reducing 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) ...

Page 5

Digital Inputs S0 digital input is designed to sense three 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 three different logic levels. The ...

Page 6

Maximum Ratings [1, 2] Supply Voltage (Vdd): .................................................. +5.5 V Input Voltage Relative to Vdd: .............................Vdd + 0.3 V Input Voltage Relative to Vss:.............................. Vss + 0.3 V Operating Temperature:.................................. 0 C to +70 C Storage Temperature: ............................... –65 C ...

Page 7

Characteristics Curves The following curves demonstrate the characteristic behavior of the CY25819 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 Electrical ...

Page 8

SSCG Profiles CY25819 SSCG products use a non-linear “optimized” frequency profile as shown in “optimized” frequency profile maintains flat energy distribution over the fundamental and higher order harmonics. This results in additional EMI reduction in electronic systems. Figure 6. CY25819 ...

Page 9

Application Schematic 14.3 MHz or 27.0 MHz Ordering Information Part Number Pb-Free CY25819SXC 8-pin SOIC CY25819SXCT 8-pin SOIC–Tape and Reel Ordering Code Definitions CY 25819 Document #: 38-07362 Rev. *D ...

Page 10

Package Drawing and Dimensions Document #: 38-07362 Rev. *D Figure 8. 8-pin SOIC 150 Mils S08.15/SZ08.15 CY25819 51-85066 *D Page [+] Feedback ...

Page 11

Acronyms Acronym Description DVD digital versatile/video disc EMI electromagnetic interference I/O input/output LAN local area network LCD liquid crystal display PLL phase locked loop SOIC small-outline integrated circuit SSC spread spectrum clock SSCG spread spectrum clock generator VCD video compact ...

Page 12

Document History Page Document Title: CY25819, Spread Spectrum Clock Generator Document Number: 38-07362 Orig. of Rev. ECN No. Issue Date Change ** 112462 03/21/02 *A 122701 12/28/02 *B 448097 See ECN *C 2901658 03/30/10 *D 3253540 05/10/2011 Document #: 38-07362 ...

Page 13

Sales, Solutions, and Legal Information Worldwide Sales and Design Support Cypress maintains a worldwide network of offices, solution centers, manufacturer’s representatives, and distributors. To find the office closest to you, visit us at Cypress Locations. Products Automotive cypress.com/go/automotive Clocks & ...

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