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部品番号 ASM3P2853A
部品説明 Peak EMI Reducing Solution
メーカ Alliance Semiconductor Corporation
ロゴ Alliance Semiconductor Corporation ロゴ 
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ASM3P2853A Datasheet, ASM3P2853A PDF,ピン配置, 機能
December 2004
wrwewv.D0a.ta7Sheet4U.com
ASM3P2853A
Peak EMI Reducing Solution
Features
Generates an EMI optimized clock signal at
output.
Input frequency: 25 MHz.
Frequency outputs:
o USB Clock (48 MHz unmodulated)
o 50 MHz (modulated), ±1% centre spread
Modulation rate: 39 KHz.
Spread Spectrum ON/OFF control
Supply voltage range 2.5V ± 5%.
Available in 8-pin SOIC package.
Commercial Temperature range.
Product Description
The ASM3P2853A is a versatile spread spectrum
frequency modulator. The ASM3P2853A reduces
electromagnetic interference (EMI) at the clock source.
The ASM3P2853A allows significant system cost savings
by reducing the number of circuit board layers and
shielding that are required to pass EMI regulations. The
ASM3P2853A modulates the output of PLL in order to
spread the bandwidth of a synthesized clock, thereby
decreasing the peak amplitudes of its harmonics. This
results in significantly lower system EMI compared to the
typical narrow band signal produced by oscillators and
most clock generators. Lowering EMI by increasing a
signal’s bandwidth is called spread spectrum clock
generation.
Applications
ASM3P2853A is targeted towards EMI management for
high speed digital applications such as PC peripheral
devices, consumer electronics and embedded controller
systems.
Block Diagram
VDD
PWDNB
XIN
XOUT
SSONB
Crystal
Oscillator
VSS
PLL1
PLL2
USB Clock
(48 MHz
Unmodulated)
50 MHz
Modulated
Alliance Semiconductor
2575 Augustine Drive Santa Clara CA Tel: 408-855-4900 Fax: 408-855-4999 www.alsc.com

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ASM3P2853A pdf, 電子部品, 半導体, ピン配列
December 2004
wrwewv.D0a.ta7Sheet4U.com
Absolute Maximum Ratings
ASM3P2853A
Symbol
Parameter
Rating
Unit
VDD Supply voltage, DC
VI Input voltage, DC
VO Output voltage, DC
IIK Input clamp current (VI<0 or VI>VDD)
IOK Output clamp current (VI<0 or VI>VDD)
TJ Junction temperature
Lead temperature (soldering 10 sec)
Input static discharge voltage protection
(MIL –STD 883E, Method 3015.7)
(VSS – 0.5) to 7
(VSS-0.5) to (VDD+0.5)
(VSS-0.5) to (VDD + 0.5)
-50 to +50
-50 to +50
150
260
2
V
V
V
mA
mA
°C
°C
kV
Note: These are stress ratings only and functional operation is not implied. Exposure to absolute maximum ratings for extended periods may affect device
reliability.
Operating Conditions
Parameter
Supply Voltage
Ambient Operating
Temperature Range
Crystal Resonator Frequency
Output Driver Load
Capacitance
Symbol
VDD
TA
Condition / Description
2.5V ± 5%
FXIN
CL
Min
2.375
0
Typ
2.5
-
Max
2.625
+70
Unit
V
°C
25 MHz
- - 15 pF
Crystal Specifications
Fundamental AT cut parallel resonant crystal
Nominal frequency
Frequency tolerance
Operating temperature range
Storage temperature
Load capacitance
Shunt capacitance
ESR
25 MHz
± 50 ppm or better at 25°C
-25°C to +85°C
-40°C to +85°C
18pF
7pF maximum
25
Peak EMI Reducing Solution
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