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PDF CY25819 Data sheet ( Hoja de datos )
| Número de pieza | CY25819 | |
| Descripción | Spread Spectrum Clock Generator | |
| Fabricantes | Cypress Semiconductor | |
| Logotipo |  |
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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
1 page  
SSCG Profiles
CY25818/19 SSCG products use a non-linear “optimized”
frequency profile as shown in Figure 6 and Figure 7. The use
of Cypress proprietary “optimized” frequency profile maintains
flat energy distribution over the fundamental and higher order
harmonics. This results in additional EMI reduction in
electronic systems.
wwwC.DYat2a5Sh8ee1t48U/.c1o9m
Figure 7. CY25819 Spread Spectrum Profile
(Frequency vs. Time)[4]
Figure 6. CY25818 Spread Spectrum Profile
(Frequency vs. Time)[3]
Application Schematic
C3 0.1 uF
Vdd
C2
27 pF
C3
27 pF
1
14.3 MHz
or
27.0 MHz
8
XIN
XOUT
7
Vdd
SSCLK
REFCLK
4
5
CY25818
CY25819
14.3 MHz (CY25818)
27.0 MHz (CY25819)
6
PD#
Vss
2
3
S0
Figure 8. Typical Application Schematic
Notes:
3. XIN = 16.0 MHz; S0 = 1; SSCLK = 16.0 MHz; BW = –2.14%.
4. Xin = 32.0MHz; S0 = 1; SSCLK = 32.0 MHz; BW = -2.15%
Document #: 38-07362 Rev. *B
Page 5 of 7
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet CY25819.PDF ] | |
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