ASM3P2185B-SR datasheet, PDF - EEWORLD Datasheet

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ASM3P2185B-SR: DescriptionClock Generator, 50MHz, CMOS, PDSO8, SOIC-8; CategoryMicrocontrollers and processors The clock generator; File Size388KB，7 Pages; ManufacturerPulseCore Semiconductor Corporation

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ASM3P2185B-SR Overview

Clock Generator, 50MHz, CMOS, PDSO8, SOIC-8

ASM3P2185B-SR Parametric

Parameter Name	Attribute value
Maker	PulseCore Semiconductor Corporation
package instruction	SOIC-8
Reach Compliance Code	unknown
Is Samacsys	N
JESD-30 code	R-PDSO-G8
length	4.92 mm
Number of terminals	8
Maximum operating temperature	70 °C
Minimum operating temperature
Maximum output clock frequency	50 MHz
Package body material	PLASTIC/EPOXY
encapsulated code	SOP
Package shape	RECTANGULAR
Package form	SMALL OUTLINE
Master clock/crystal nominal frequency	50 MHz
Certification status	Not Qualified
Maximum seat height	1.8 mm
Maximum supply voltage	3.7 V
Minimum supply voltage	2.7 V
Nominal supply voltage	3.3 V
surface mount	YES
technology	CMOS
Temperature level	COMMERCIAL
Terminal form	GULL WING
Terminal pitch	1.27 mm
Terminal location	DUAL
width	3.95 mm
uPs/uCs/peripheral integrated circuit type	CLOCK GENERATOR, OTHER
Base Number Matches	1

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November 2003

rev 1.1

ASM3P2185B

EMI Reduction IC

Features

FCC approved method of EMI attenuation.

Provides up to 15dB EMI reduction.

Generates a 1X low EMI spread spectrum clock of

the input frequency.

Input frequency range: 25MHz to 50 MHz.

Internal loop filter minimizes external components

and board space.

Down Spread and Center Spread.

2 spread frequency deviation selections: -1.25%

and ± 0.8%.

Low inherent cycle-to-cycle jitter.

3.3V operating voltage range.

TTL or CMOS compatible inputs and outputs.

Low power CMOS design.

Supports notebook VGA and other LCD timing

controller applications.

Products are available for industrial temperature

range.

Available in 8-pin SOIC and TSSOP.

The ASM3P2185B reduces electromagnetic interference

(EMI) at the clock source, allowing system wide EMI

reduction for all the down stream clocks and data

dependent signals. The ASM3P2185B allows significant

system cost savings by reducing the number of circuit

board layers, ferrite beads, shielding, and other passive

components that are traditionally required to pass EMI

regulations.

The ASM3P2185B uses the most efficient and optimized

modulation profile approved by the FCC and is

implemented in a proprietary all digital method.

The ASM3P2185B 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’.

Product Description

The ASM3P2185B is a versatile spread spectrum

frequency modulator designed specifically for a wide

range of input clock frequencies from 25MHz to 50MHz.

The ASM3P2185B can generate an EMI reduced clock

from an OSC or a system generated clock.

Applications

The ASM3P2185B is targeted towards EMI management

for memory and LVDS interfaces in mobile graphic

chipsets and high-speed digital applications such as PC

peripheral devices, consumer electronics, and embedded

controller systems.

Block Diagram

SS%

VDD

Modulation

XIN

Crystal

Oscillator

XOUT

Feedback

Divider

Frequenc

Phase

Detector

Loop

Filter

PLL

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.

ASM3P2185B-SR Related Products

	ASM3P2185B-SR	ASM3P2185B-TT	ASM3P2185B-TR	ASM3P2185B-ST
Description	Clock Generator, 50MHz, CMOS, PDSO8, SOIC-8	Clock Generator, 50MHz, CMOS, PDSO8, TSSOP-8	Clock Generator, 50MHz, CMOS, PDSO8, TSSOP-8	Clock Generator, 50MHz, CMOS, PDSO8, SOIC-8
Maker	PulseCore Semiconductor Corporation	PulseCore Semiconductor Corporation	PulseCore Semiconductor Corporation	PulseCore Semiconductor Corporation
package instruction	SOIC-8	TSSOP-8	TSSOP-8	SOIC-8
Reach Compliance Code	unknown	unknown	unknown	unknown
JESD-30 code	R-PDSO-G8	R-PDSO-G8	R-PDSO-G8	R-PDSO-G8
length	4.92 mm	4.4 mm	4.4 mm	4.92 mm
Number of terminals	8	8	8	8
Maximum operating temperature	70 °C	70 °C	70 °C	70 °C
Maximum output clock frequency	50 MHz	50 MHz	50 MHz	50 MHz
Package body material	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY
encapsulated code	SOP	TSSOP	TSSOP	SOP
Package shape	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR
Package form	SMALL OUTLINE	SMALL OUTLINE, THIN PROFILE, SHRINK PITCH	SMALL OUTLINE, THIN PROFILE, SHRINK PITCH	SMALL OUTLINE
Master clock/crystal nominal frequency	50 MHz	50 MHz	50 MHz	50 MHz
Certification status	Not Qualified	Not Qualified	Not Qualified	Not Qualified
Maximum seat height	1.8 mm	1.1 mm	1.1 mm	1.8 mm
Maximum supply voltage	3.7 V	3.7 V	3.7 V	3.7 V
Minimum supply voltage	2.7 V	2.7 V	2.7 V	2.7 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	COMMERCIAL	COMMERCIAL	COMMERCIAL	COMMERCIAL
Terminal form	GULL WING	GULL WING	GULL WING	GULL WING
Terminal pitch	1.27 mm	0.65 mm	0.65 mm	1.27 mm
Terminal location	DUAL	DUAL	DUAL	DUAL
width	3.95 mm	3 mm	3 mm	3.95 mm
uPs/uCs/peripheral integrated circuit type	CLOCK GENERATOR, OTHER	CLOCK GENERATOR, OTHER	CLOCK GENERATOR, OTHER	CLOCK GENERATOR, OTHER

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