I2781A-08ST datasheet, PDF - EEWORLD Datasheet

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I2781A-08ST: DescriptionClock Generator, 78MHz, CMOS, PDSO8, SOIC-8; CategoryThe embedded processor and controller Microcontrollers and processors; File Size83KB，9 Pages; ManufacturerALSC [Alliance Semiconductor Corporation]

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I2781A-08ST Overview

Clock Generator, 78MHz, CMOS, PDSO8, SOIC-8

I2781A-08ST Parametric

Parameter Name	Attribute value
Is it Rohs certified?	incompatible
Parts packaging code	SOIC
package instruction	SOP,
Contacts	8
Reach Compliance Code	unknown
ECCN code	EAR99
JESD-30 code	R-PDSO-G8
JESD-609 code	e0
length	4.9 mm
Number of terminals	8
Maximum operating temperature	85 °C
Minimum operating temperature	-40 °C
Maximum output clock frequency	78 MHz
Package body material	PLASTIC/EPOXY
encapsulated code	SOP
Package shape	RECTANGULAR
Package form	SMALL OUTLINE
Peak Reflow Temperature (Celsius)	NOT SPECIFIED
Master clock/crystal nominal frequency	78 MHz
Certification status	Not Qualified
Maximum seat height	1.75 mm
Maximum supply voltage	3.6 V
Minimum supply voltage	3 V
Nominal supply voltage	3.3 V
surface mount	YES
technology	CMOS
Temperature level	INDUSTRIAL
Terminal surface	TIN LEAD
Terminal form	GULL WING
Terminal pitch	1.27 mm
Terminal location	DUAL
Maximum time at peak reflow temperature	NOT SPECIFIED
width	3.91 mm
uPs/uCs/peripheral integrated circuit type	CLOCK GENERATOR, OTHER
Base Number Matches	1

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Final Specification

Alliance Semiconductor

P2781/82/84

General Purpose EMI Reduction IC

FEATURES

•

Provides up to 15 dB of EMI suppression

FCC approved method of EMI attenuation

Generates a 1X, 2X, and 4X low EMI spread

spectrum clock of the input frequency

Input frequency range from 3 to 78 MHz

External loop filter for spread % adjustment

Spreading ranges from +/-0.25% to +/-5.0%

•

Ultra low cycle-to-cycle jitter

Zero-cycle slip

3.3V operating voltage range

10 mA output drives

TTL or CMOS compatible outputs

Ultra-low power CMOS design

Available in 8 pin SOIC and TSSOP

PRODUCT DESCRIPTION

APPLICATIONS

The P278xx is a versatile spread spectrum

frequency modulator designed specifically for

digital camera and other digital video and imaging

applications.

The

P278xx

reduces

electromagnetic interference (EMI) at the clock

source, which provides system wide reduction of

EMI of all clock dependent signals. The P278xx

allows significant system cost savings by reducing

the number of circuit board layers and shielding

that are traditionally required to pass EMI

regulations.

The P278xx uses the most efficient and optimized

modulation profile approved by the FCC.

The P278xx 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”.

The P278xx is targeted towards MFP, xDSL, fax

modem, set-top box, USB controller, DSC, and

embedded systems.

Figure 1 - Pin Diagram

X IN 1

XOUT 2

FS1

P 2 7 8 X A -0 8 S

P 2 7 8 X A -0 8 T

VDD

FS0

M odO ut

VSS

Standard pin configuration offered in both

8 SOIC and TSSOP packages

FS0

VDD

X IN

P 2 7 8 X B -0 8 T

M odO ut

VSS

FS1

XOUT 4

Alternative pin configuration available

only for 8 TSSOP package

Nov, 2002

Revision F

PulseCore – A Division of Alliance Semiconductor

3160 De La Cruz Blvd., Suite 200 • Santa Clara • CA • 95054

Tel (408) 748-6988 • Fax (408) 748-0009

http://www.pulsecore.com

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I2781A-08ST Related Products

	I2781A-08ST	I2782A-08TT	I2784A-08SR	I2781A-08SR
Description	Clock Generator, 78MHz, CMOS, PDSO8, SOIC-8	Clock Generator, 156MHz, CMOS, PDSO8, TSSOP-8	Clock Generator, 312MHz, CMOS, PDSO8, SOIC-8	Clock Generator, 78MHz, CMOS, PDSO8, SOIC-8
Is it Rohs certified?	incompatible	incompatible	incompatible	incompatible
Parts packaging code	SOIC	SOIC	SOIC	SOIC
package instruction	SOP,	TSSOP,	SOP,	SOP,
Contacts	8	8	8	8
Reach Compliance Code	unknown	unknown	unknown	unknown
ECCN code	EAR99	EAR99	EAR99	EAR99
JESD-30 code	R-PDSO-G8	R-PDSO-G8	R-PDSO-G8	R-PDSO-G8
JESD-609 code	e0	e0	e0	e0
length	4.9 mm	4.4 mm	4.9 mm	4.9 mm
Number of terminals	8	8	8	8
Maximum operating temperature	85 °C	85 °C	85 °C	85 °C
Minimum operating temperature	-40 °C	-40 °C	-40 °C	-40 °C
Maximum output clock frequency	78 MHz	156 MHz	312 MHz	78 MHz
Package body material	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY
encapsulated code	SOP	TSSOP	SOP	SOP
Package shape	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR
Package form	SMALL OUTLINE	SMALL OUTLINE, THIN PROFILE, SHRINK PITCH	SMALL OUTLINE	SMALL OUTLINE
Peak Reflow Temperature (Celsius)	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED
Master clock/crystal nominal frequency	78 MHz	78 MHz	78 MHz	78 MHz
Certification status	Not Qualified	Not Qualified	Not Qualified	Not Qualified
Maximum seat height	1.75 mm	1.1 mm	1.75 mm	1.75 mm
Maximum supply voltage	3.6 V	3.6 V	3.6 V	3.6 V
Minimum supply voltage	3 V	3 V	3 V	3 V
Nominal supply voltage	3.3 V	3.3 V	3.3 V	3.3 V
surface mount	YES	YES	YES	YES
technology	CMOS	CMOS	CMOS	CMOS
Temperature level	INDUSTRIAL	INDUSTRIAL	INDUSTRIAL	INDUSTRIAL
Terminal surface	TIN LEAD	TIN LEAD	TIN LEAD	TIN LEAD
Terminal form	GULL WING	GULL WING	GULL WING	GULL WING
Terminal pitch	1.27 mm	0.65 mm	1.27 mm	1.27 mm
Terminal location	DUAL	DUAL	DUAL	DUAL
Maximum time at peak reflow temperature	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED
width	3.91 mm	3 mm	3.91 mm	3.91 mm
uPs/uCs/peripheral integrated circuit type	CLOCK GENERATOR, OTHER	CLOCK GENERATOR, OTHER	CLOCK GENERATOR, OTHER	CLOCK GENERATOR, OTHER
Base Number Matches	1	1	1	1
Maker	-	ALSC [Alliance Semiconductor Corporation]	ALSC [Alliance Semiconductor Corporation]	ALSC [Alliance Semiconductor Corporation]

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