Cypress CY25818 Clock User Manual


 
Spread Spectrum Clock Generato
r
CY25818/19
Cypress Semiconductor Corporation 198 Champion Court San Jose, CA 95134-1709 408-943-2600
Document #: 38-07362 Rev. *B Revised April 11, 2006
Features
8- to 32-MHz input frequency range
CY25818: 8–16 MHz
CY25819: 16–32 MHz
Separate modulated and unmodulated clocks
Accepts clock, crystal, and resonator inputs
Down spread modulation
Power-down function
Low-power dissipation
CY25818 = 33 mW-typ @ 8 MHz
CY25818 = 56 mW-typ @ 16 MHz
CY25819 = 36 mW-typ @ 16 MHz
CY25819 = 63 mW-typ @ 32 MHz
Low cycle-to-cycle jitter
SSCLK = 250 ps-typ
REFOUT = 275 ps-typ
Available in 8-pin (150-mil) SOIC package
Applications
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
Benefits
Peak electromagnetic interference (EMI) reduction by
8–16 dB
Fast time to market
Cost reduction
REFERENCE
DIVIDER
PD and
CP
LF
VCO
DIVIDER
and
MUX
INPUT
DECODER
1
8
300K
MODULATION
CONTROL
3 6
S0
PD#
XIN/CLKIN
XOUT
VDD
7
VSS
2
4
SSCLK
5
REFCLK
VCO
COUNTER
2
1
3
4
8
7
6
5
XIN/CLKIN
Vss
S0
SSCLK
XOUT
Vdd
PD#
REFCLK
CY25818
CY25819
8 Pin SOIC
8-pin SOIC
Block Diagram Pin Configuration
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