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What is P2782?

This electronic component, produced by the manufacturer "Alliance Semiconductor", performs the same function as "General Purpose EMI Reduction IC".


P2782 Datasheet PDF - Alliance Semiconductor

Part Number P2782
Description General Purpose EMI Reduction IC
Manufacturers Alliance Semiconductor　
Logo Alliance Semiconductor Logo　


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July 2005
P2781/82/84
rev 1.5
General Purpose EMI Reduction IC
Features
ƒ Provides up to 15dB of EMI suppression
ƒ FCC approved method of EMI attenuation
ƒ Generates a 1X, 2X, and 4X low EMI spread
spectrum clock of the input frequency
ƒ Input frequency range from 3 to 78MHz
ƒ External loop filter for spread % adjustment
ƒ Spreading ranges from ±0.25% to ±5.0%
ƒ Ultra low cycle-to-cycle jitter
ƒ Zero-cycle slip
ƒ 3.3V operating voltage range
ƒ 10 mA output drives
ƒ TTL or CMOS compatible outputs
ƒ Ultra-low power CMOS design
ƒ P278XA is available in 8 pin SOIC and TSSOP
Packages
ƒ Available for industrial and automotive
temperature ranges.
Product Description
other digital video and imaging applications. The P278xA
reduces electromagnetic interference (EMI) at the clock
source, which provides system wide reduction of EMI of
all clock dependent signals. The P278xA allows
significant system cost savings by reducing the number of
circuit board layers and shielding that are traditionally
required to pass EMI regulations.
The P278xA uses the most efficient and optimized
modulation profile approved by the FCC. The P278xA
modulates the output of a single PLL in order to “spread”
the bandwidth of a synthesized clock and, more
importantly, decreases 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 frequency generators. Lowering EMI
by increasing a signal’s bandwidth is called spread
spectrum clock generation.
Applications
The P278xA is a versatile spread spectrum frequency
modulator designed specifically for digital camera and
The P278xA is targeted towards MFP, xDSL, fax modem,
set-top box, USB controller, DSC, and embedded systems.
Block Diagram
FS0 FS1 LF
VDD
XIN /CLKIN
XOUT
Crystal
Oscillator
www.DataSheet4U.com
Frequency
Divider
Feedback
Divider
Modulation
PLL
Phase
Detector
VCO
Output
Divider
ModOUT
VSS
Alliance Semiconductor
2575, Augustine Drive • Santa Clara, CA • Tel: 408.855.4900 • Fax: 408.855.4999 • www.alsc.com
Notice: The information in this document is subject to change without notice.

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P2782 equivalent
July 2005
P2781/82/84
rev 1.5
Absolute Maximum Ratings
Symbol
VDD
VI
VO
IIK
IOK
TS
TA
TJ
Parameter
Supply voltage, DC
Input voltage, DC
Output voltage, DC
Input clamp current (VI<0 or VI>VDD)
Output clamp current (VI<0 or VI>VDD)
Storage temperature
Ambient temperature range, under bias
Junction temperature
Lead temperature (soldering 10 sec)
Input static discharge voltage protection
(As per JEDEC STD22- A114-B)
Rating
(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
-65 to +125
-55 to 125
150
260
2
Unit
V
V
V
mA
mA
°C
°C
°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.
DC Electrical Characteristics
(Test condition: All parameters are measured at room temperature (+25°C) unless otherwise stated)
Symbol
Parameter
VIL Input low voltage
VIH Input high voltage
IIL
Input low current
(internal input pull-up resistor on FS0 and FS1)
IIH
Input high current
(internal input pull-up resistor on FS0 and FS1)
IXOL XOUT output low current
IXOH XOUT output high current
VOL Output low voltage (VDD = 3.3V, IOL = 20mA)
Min
VSS – 0.3
2.0
-
-
-
-
-
Typ
-
-
60
60
10
10
-
Max
0.8
VDD +0.3
-
-
-
-
0.4
Unit
V
V
µA
µA
mA
mA
V
VOH
IDD
ICC
VDD
Output high voltage (VDD = 3.3V, IOH = 20mA)
Static supply current
Typical dynamic supply current
(25pF scope probe loading)
Operating voltage
2.5
-
5.2 at 3MHz
3.0
- -V
3 - mA
- 21.2 at 82MHz mA
3.3 3.6 V
www.DataSheet4U.com
General Purpose EMI Reduction IC
Notice: The information in this document is subject to change without notice.
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