Datasheet > ASM3P2854B

ASM3P2854B

更新时间： 2024-11-21 06:38:11

品牌	Logo	应用领域
PULSECORE		时钟发生器
页数	文件大小	规格书
8页	384K
描述
Custom Clock Generator for Fax System

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中文翻译

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数据手册

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ASM3P2854B 数据手册

August 2007

rev 0.3

ASM3P2854B

Custom Clock Generator for Fax System

Features

•

Generates Custom Clocks for FAX system from

an inexpensive 24MHz Crystal

•

1x 25MHz low EMI (Spread Spectrum) clock for

LCD, Serial port, and buzzer of ASIC1

1x 12MHz for USB PHY (USB2.0)

1x Programmable clock for printer engine control

One of the four programmable clock outputs

selection through two Select Pins

Supply Voltage 3.3V +/- 0.3V

Available in 16L TSSOP, Green package

Commercial Temperature operation

•

2x 66.66MHz low EMI (Spread Spectrum) clocks

for ASIC1 (System / DDR SDRAM)

1 x 48MHz for USB1.1 HOST

2 x 33.33MHz low EMI (Spread Spectrum)

clocks for System / DDR SDRAM of ASIC2 and

ASIC3

•

Product Description

ASM3P2854B is a part of the two chip custom clock

generator solution for NEC FAX system. Together with

ASM3P2855A, ASM3P2854B realizes all the seventeen

clocks required by the various components and

subsystems of the FAX system. It uses an inexpensive

24MHz crystal as the input to generate two 66.66MHz low

EMI (spread spectrum) clocks used by ASIC1 for system

48MHz clock used by USB1.1 HOST, and a 12MHz clock

used by USB PHY (USB2.0). One of the four

Programmable

24.00448MHz,

clock

21.33732MHz,

(PCLK)

frequencies

21.19962MHz

and

20.40464MHz used for Printer Engine control is

selectable through two Select pins S1 and S2. The

accuracy of the synthesized programmable clocks is

within +/- 18ppm. The custom clock generator works with

a Supply Voltage for 3.3V. The device is available in a

16L TSSOP Green package, in commercial temperature

range. The output Clocks have an accuracy of ±50ppm.

DDR SDRAM, two 33.33MHz low EMI (spread

spectrum) clocks used by ASIC2 and ASIC3 for system /

DDR SDRAM, a 25MHz low EMI (Spread Spectrum)

clock used by ASIC1 for LCD, Serial port, and buzzer, a

VDD_FOUT

Block Diagram

VDD

66.6MHz SSCLK

PLL

33.3MHz SSCLK

25MHz SSCLK

XIN / CLKIN

XOUT

48MHz

Crystal

PLL

(24 MHz)

12MHz

PCLK

GND_FOUT

GND

PulseCore Semiconductor Corporation

1715 S. Bascom Ave Suite 200 Campbell, CA 95008 • Tel: 408-879-9077 • Fax: 408-879-9018

www.pulsecoresemi.com

Notice: The information in this document is subject to change without notice.

12 3 4 5 6 7 8

中文翻译

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与ASM3P2854B相关器件

型号	品牌	获取价格	描述	数据表
ASM3P2854B_1	PULSECORE	获取价格	Custom Clock Generator for Fax System
ASM3P2854BG-16TR	PULSECORE	获取价格	Custom Clock Generator for Fax System
ASM3P2854BG-16-TR	PULSECORE	获取价格	Custom Clock Generator for Fax System
ASM3P2854BG-16TT	PULSECORE	获取价格	Custom Clock Generator for Fax System
ASM3P2854BG-16-TT	PULSECORE	获取价格	Custom Clock Generator for Fax System
ASM3P2854C	ONSEMI	获取价格	Custom Clock Generator for Fax System
ASM3P2854CG-16TR	ONSEMI	获取价格	Custom Clock Generator for Fax System
ASM3P2855B	PULSECORE	获取价格	Custom Clock Generator for Fax System
ASM3P2855B_1	PULSECORE	获取价格	Custom Clock Generator for Fax System
ASM3P2855BG-16TR	PULSECORE	获取价格	Custom Clock Generator for Fax System

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