AS80M2183/84 Reduction Product Proposal FEATURES approv
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Alliance Semiconductor
AS80M2183/84
Reduction
Product Proposal
FEATURES approved method attenuation Provides reduction Generates spread spectrum clock from input frequency Optimized frequency range:
AS80M2183/84:
spread selections: AS80M2183: 1.25% 3.75% AS80M2184: 0.625% 1.875% 3.3V operating voltage CMOS/TTL compatible inputs outputs power CMOS design Supports notebook other timing controller applications Products available industrial temperature range. Available SOIC TSSOP
Internal loop filter minimizes external components board space AS80M2183: Down Spread AS80M2184: Center Spread inherent cycle-to-cycle jitter
PRODUCT DESCRIPTION AS80M2183/84 versatile spread spectrum frequency modulator designed specifically wide range input clock frequencies from (see Table AS80M2183/84 generate reduced clock from system generated clock. AS80M2183/84 reduces electromagnetic interference (EMI) clock source, allowing system wide reduction down stream clocks data dependent signals. AS80M2183/84 allows significant system cost savings reducing number circuit board layers, ferrite beads, shielding, other passive components that traditionally required pass regulations.
AS80M2183/84 modulates output single order "spread" bandwidth synthesized clock, thereby decreasing peak amplitudes harmonics. This results significantly lower system compared typical narrow band signal produced oscillators most clock generators. Lowering increasing signal's bandwidth called "spread spectrum clock generation". AS80M2183/84 uses most efficient optimized modulation profile approved implemented using proprietary alldigital method. APPLICATIONS AS80M2183/84 targeted towards management memory LVDS interfaces mobile graphic chipsets high-speed digital applications such peripheral devices, consumer electronics, embedded controller systems.
Jul., 2003 Revision
PulseCore Division Alliance Semiconductor 3160 Cruz Blvd., Suite Santa Clara 95054 (408) 748-6988 (408) 748-0009 http://www.alsc.com
Product Proposal
Alliance Semiconductor Figure AS80M2183/84 Diagrams
AS80M2183/84
XOUT
AS80M2183/84
MODOUT
Figure AS80M2183/84 Block Diagram
Jun., 2003 Revision
PulseCore Division Alliance Semiconductor 3160 Cruz Blvd., Suite Santa Clara 95054 (408) 748-6988 (408) 748-0009 http://www.alsc.com
Alliance Semiconductor
AS80M2183/84
Product Proposal
Table Input Frequency Modulation Rate Part Number (pin AS80M2183/84 (pin Frequency Range
Table Spread Deviation Selections Part Number AS80M2183 (pin Spread Deviation 1.25% 3.75% 0.625% 1.875%
AS80M2184
DESCRIPTION Name XOUT ModOut Type Description Connect externally generated clock signal. Crystal Connection. Ground. Spread Range Select. Digital logic input used select frequency deviation (see Table This internal pull-up resistor. Spread Spectrum output Connect +3.3V. Frequency range select. Digital Logic input used select frequency range (see Table This internal pull-up resistor. Frequency range select. Digital Logic input used select frequency range (see Table This internal pull-up resistor.
Jun., 2003 Revision
PulseCore Division Alliance Semiconductor 3160 Cruz Blvd., Suite Santa Clara 95054 (408) 748-6988 (408) 748-0009 http://www.alsc.com
Product Proposal
Alliance Semiconductor ABSOLUTE MAXIMUM RATINGS Symbol VDD, TSTG Parameter Voltage with respect Storage Temperature Operating Temperature Rating -0.5 +7.0 +125 Unit
AS80M2183/84
ELECTRICAL CHARACTERISTICS Symbol IXOL IXOH ZOUT Parameter Input Voltage Input High Voltage Input Current Input High Current XOUT Output Current 0.4V, 3.3V) XOUT Output High Current 2.5V, 3.3V) Output Voltage (VDD=3.3V, Output High Voltage (VDD=3.3V, Static Supply Current Standby Mode Dynamic Supply Current Normal Mode (3.3V loading) Operating Voltage Power Time (First locked clock cycle after power Clock Output Impedance 8.46 0.18 VDD+0.3 17.78 Unit
ELECTRICAL CHARACTERISTICS Symbol Parameter Unit
Input Frequency fOUT Output Frequency Output Rise Time Note (measured 0.8V 2.0V) Output Fall Time Note (measured 2.0V 0.8V) Jitter (cycle cycle) Output Duty Cycle Note1: measured into capacitive load 15pF
Jun., 2003 Revision
PulseCore Division Alliance Semiconductor 3160 Cruz Blvd., Suite Santa Clara 95054 (408) 748-6988 (408) 748-0009 http://www.alsc.com
Product Proposal
Alliance Semiconductor
AS80M2183/84
Figure Mechanical Package Outline SOIC)
INCHES MILLIMETERS SYMBOL 0.057 0.064 0.071 1.45 1.63 1.80 0.004 0.007 0.010 0.10 0.18 0.25 0.053 0.061 0.069 1.35 1.55 1.75 0.012 0.016 0.020 0.31 0.41 0.51 0.004 0.006 0.001 0.10 0.15 0.25 0.186 0.194 0.202 4.72 4.92 5.12 0.148 0.156 0.164 3.75 3.95 4.15 0.050 1.27 0.224 0.236 0.248 5.70 6.00 6.30 0.012 0.020 0.028 0.30 0.50 0.70 Note: Controlling dimensions millimeters. SOIC 0.074 grams unit weight
Figure Mechanical Package Outline TSSOP)
INCHES MILLIMETERS SYMBOL 0.047 1.10 0.002 0.006 0.05 0.15 0.031 0.039 0.041 0.80 1.00 1.05 0.007 0.012 0.19 0.30 0.004 0.008 0.09 0.20 0.114 0.118 0.122 2.90 3.00 3.10 0.169 0.173 0.177 4.30 4.40 4.50 0.026 0.65 0.244 0.252 0.260 6.20 6.40 6.60 0.018 0.024 0.030 0.45 0.60 0.75 Note: Controlling dimensions millimeters. TSSOP 0.034 grams unit weight
Jun., 2003 Revision
PulseCore Division Alliance Semiconductor 3160 Cruz Blvd., Suite Santa Clara 95054 (408) 748-6988 (408) 748-0009 http://www.alsc.com
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