SM561 Datasheet, PDF (1/8 Pages) Cypress Semiconductor – Spread Spectrum Clock Generator

Features
• 54- to 166-MHz operating frequency range
• Wide (9) range of spread selections
• Accepts clock and crystal inputs
• Low power dissipation
• 3.3V = 165 mw. (Fin = 120 MHz)
• Frequency spread disable function
• Center spread modulation
• Low cycle-to-cycle jitter
• Eight-pin SOIC package
Block Diagram
SM561
Spread Spectrum Clock Generator
Applications
• High-resolution VGA controllers
• LCD panels and monitors
• Workstations and servers
Benefits
• Peak electromagnetic interference (EMI) reduction by 8 to
16 dB
• Fast time to market
• Cost reduction
Pin Configuration
250 K
Xin/ ₁
CLK
4 pf
Xout ⁸
8 pF
VDD 2
VSS 3
REFERENCE
DIVIDER
MODULATION
CONTROL
INPUT
DECODER
LOGIC
5
SSCC
6
7
S1 S0
PD CP
FEEDBACK
DIVIDER
Xin/CLK 1
VDD
2
LF
VSS
3
SSCLK
4
VCO
DIVIDER
AND MUX
4 SSCLK
8 Xout
7 S0
6 S1
5 SSCC
Cypress Semiconductor Corporation • 3901 North First Street • San Jose, CA 95134 • 408-943-2600
Document #: 38-07021 Rev. *C
Revised December 14, 2002