CY25818_09 Datasheet, PDF (1/7 Pages) Cypress Semiconductor – Spread Spectrum Clock Generator

CY25818/19
Spread Spectrum Clock Generator
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
Block Diagram
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
Pin Configuration
300K
XIN/CLKIN 1
XOUT 8
VDD 7
VSS 2
REFERENCE
DIVIDER
PD and
CP
LF
MODULATION
CONTROL
VCO
COUNTER
VCO
INPUT
DECODER
36
S0 PD#
DIVIDER
and
MUX
4 SSCLK
5 REFCLK
XIN/CLKIN 1
8 _XOUT
Vss ² CY25818
CY25819
S0 ³
7 _Vdd
6 PD#
SSCLK 4
5 _REFCLK
8 Pin SOIC
8-pin SOIC
Cypress Semiconductor Corporation • 198 Champion Court • San Jose, CA 95134-1709 • 408-943-2600
Document #: 38-07362 Rev. *B
Revised April 11, 2006