ASM3I2508AF-08ST datasheet, PDF

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ASM3I2508AF-08ST: DescriptionClock Generator, 120MHz, CMOS, PDSO8, 0.150 INCH, ROHS COMPLIANT, SOIC-8; CategoryMicrocontrollers and processors The clock generator; File Size369KB，9 Pages; ManufacturerPulseCore Semiconductor Corporation; Environmental Compliance

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ASM3I2508AF-08ST Overview

Clock Generator, 120MHz, CMOS, PDSO8, 0.150 INCH, ROHS COMPLIANT, SOIC-8

ASM3I2508AF-08ST Parametric

Parameter Name	Attribute value
Is it Rohs certified?	conform to
Maker	PulseCore Semiconductor Corporation
package instruction	0.150 INCH, ROHS COMPLIANT, SOIC-8
Reach Compliance Code	unknown
Is Samacsys	N
JESD-30 code	R-PDSO-G8
length	4.9 mm
Number of terminals	8
Maximum operating temperature	85 °C
Minimum operating temperature	-40 °C
Maximum output clock frequency	120 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	14.31818 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 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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ASM3P2508A

Peak EMI Reducing Solution

Features

Generates an EMI optimized clocking signal at

output.

Input frequency – 14.31818MHz.

Frequency outputs:

120MHz (modulated) - default.

72MHz (modulated) or 48MHz (modulated)

selectable via I2C

±1% Centre spread.

Modulation rate: 40KHz.

Byte Write via I2C

Supply voltage range 3.3V ± 0.3V.

Available in 8-pin SOIC Package.

Available in Commercial and Industrial

Temperature ranges.

The ASM3P2508A has a feature to power down the

72MHz / 48MHz output by writing data into specific

registers in the device via I2C. By writing a ‗0‘ into bit 1 of

Byte 0, the PLL block generating 72MHz / 48MHz can be

powered down. Writing ‗0‘ into bit ‗7‘ of Byte 1 selects an

output of 72MHz on FOUT2CLK while a ‗1‘ at the same

location selects a 48MHz clock output. However, the I2C

block, crystal oscillator, and the PLL block generating

120MHz would be always running.

shielding that are required to pass EMI regulations. The

ASM3P2508A 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.

Product Description

The ASM3P2508A is a versatile spread spectrum

frequency modulator. The ASM3P2508A reduces

electromagnetic interference (EMI) at the clock source.

The ASM3P2508A allows significant system cost savings

by reducing the number of circuit board layers and

Block Diagram

XIN

XOUT

Crystal

Oscillator

PLL 1

FOUT1CLK

(120MHz)

SCL

SDA

I2C

Interface

PLL 2

FOUT2CLK

(72 MHz / 48MHz)

JANUARY 2010 – Rev. 2

Publication Order Number:

ASM3P2508/D

ASM3I2508AF-08ST Related Products

	ASM3I2508AF-08ST	ASM3P2508AG-08ST	PTN2208H2183DGT0	ASM3I2508AG-08SR	ASM3P2508AF-08ST	ASM3I2508AF-08SR	ASM3P2508AG-08SR
Description	Clock Generator, 120MHz, CMOS, PDSO8, 0.150 INCH, ROHS COMPLIANT, SOIC-8	Clock Generator, 120MHz, CMOS, PDSO8, 0.150 INCH, GREEN, SOIC-8	RESISTOR, THIN FILM, 0.75 W, 0.5 %, 50 ppm, 218000 ohm, SURFACE MOUNT, 2208, CHIP, ROHS COMPLIANT	Clock Generator, 120MHz, CMOS, PDSO8, 0.150 INCH, GREEN, SOIC-8	Clock Generator, 120MHz, CMOS, PDSO8, 0.150 INCH, ROHS COMPLIANT, SOIC-8	Clock Generator, 120MHz, CMOS, PDSO8, 0.150 INCH, ROHS COMPLIANT, SOIC-8	Clock Generator, 120MHz, CMOS, PDSO8, 0.150 INCH, GREEN, SOIC-8
package instruction	0.150 INCH, ROHS COMPLIANT, SOIC-8	0.150 INCH, GREEN, SOIC-8	SMT, 2208	0.150 INCH, GREEN, SOIC-8	0.150 INCH, ROHS COMPLIANT, SOIC-8	0.150 INCH, ROHS COMPLIANT, SOIC-8	0.150 INCH, GREEN, SOIC-8
Reach Compliance Code	unknown	unknown	compliant	unknown	unknown	unknown	unknown
Number of terminals	8	8	2	8	8	8	8
Maximum operating temperature	85 °C	70 °C	155 °C	85 °C	70 °C	85 °C	70 °C
Minimum operating temperature	-40 °C	-	-55 °C	-40 °C	-	-40 °C	-
Package form	SMALL OUTLINE	SMALL OUTLINE	SMT	SMALL OUTLINE	SMALL OUTLINE	SMALL OUTLINE	SMALL OUTLINE
surface mount	YES	YES	YES	YES	YES	YES	YES
technology	CMOS	CMOS	THIN FILM	CMOS	CMOS	CMOS	CMOS
Is it Rohs certified?	conform to	-	conform to	-	conform to	conform to	-
Is Samacsys	N	N	-	N	N	-	-
JESD-30 code	R-PDSO-G8	R-PDSO-G8	-	R-PDSO-G8	R-PDSO-G8	R-PDSO-G8	R-PDSO-G8
length	4.9 mm	4.9 mm	-	4.9 mm	4.9 mm	4.9 mm	4.9 mm
Maximum output clock frequency	120 MHz	120 MHz	-	120 MHz	120 MHz	120 MHz	120 MHz
Package body material	PLASTIC/EPOXY	PLASTIC/EPOXY	-	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY
encapsulated code	SOP	SOP	-	SOP	SOP	SOP	SOP
Package shape	RECTANGULAR	RECTANGULAR	-	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR
Master clock/crystal nominal frequency	14.31818 MHz	14.31818 MHz	-	14.31818 MHz	14.31818 MHz	14.31818 MHz	14.31818 MHz
Certification status	Not Qualified	Not Qualified	-	Not Qualified	Not Qualified	Not Qualified	Not Qualified
Maximum seat height	1.75 mm	1.75 mm	-	1.75 mm	1.75 mm	1.75 mm	1.75 mm
Maximum supply voltage	3.6 V	3.6 V	-	3.6 V	3.6 V	3.6 V	3.6 V
Minimum supply voltage	3 V	3 V	-	3 V	3 V	3 V	3 V
Nominal supply voltage	3.3 V	3.3 V	-	3.3 V	3.3 V	3.3 V	3.3 V
Temperature level	INDUSTRIAL	COMMERCIAL	-	INDUSTRIAL	COMMERCIAL	INDUSTRIAL	COMMERCIAL
Terminal form	GULL WING	GULL WING	-	GULL WING	GULL WING	GULL WING	GULL WING
Terminal pitch	1.27 mm	1.27 mm	-	1.27 mm	1.27 mm	1.27 mm	1.27 mm
Terminal location	DUAL	DUAL	-	DUAL	DUAL	DUAL	DUAL
width	3.91 mm	3.91 mm	-	3.91 mm	3.91 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	CLOCK GENERATOR, OTHER	CLOCK GENERATOR, OTHER
Base Number Matches	1	1	-	1	1	1	1

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