Datasheet > C9819ATB

C9819ATB

更新时间： 2024-01-20 07:29:40

品牌	Logo	应用领域
赛普拉斯 - CYPRESS		光电二极管外围集成电路
页数	文件大小	规格书
17页	198K
描述
Processor Specific Clock Generator, CMOS, PDSO48, TSSOP-48

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技术参数
数据手册

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C9819ATB 技术参数

生命周期：	Obsolete	零件包装代码：	TSSOP
包装说明：	TSSOP,	针数：	48
Reach Compliance Code：	unknown	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	风险等级：	5.8
JESD-30 代码：	R-PDSO-G48	JESD-609代码：	e0
长度：	12.5 mm	端子数量：	48
封装主体材料：	PLASTIC/EPOXY	封装代码：	TSSOP
封装形状：	RECTANGULAR	封装形式：	SMALL OUTLINE, THIN PROFILE, SHRINK PITCH
认证状态：	Not Qualified	座面最大高度：	1.2 mm
表面贴装：	YES	技术：	CMOS
端子面层：	TIN LEAD	端子形式：	GULL WING
端子节距：	0.5 mm	端子位置：	DUAL
宽度：	6.1 mm	uPs/uCs/外围集成电路类型：	CLOCK GENERATOR, PROCESSOR SPECIFIC
Base Number Matches：	1

C9819ATB 数据手册

+/+…when timing is critical

C9819

133 MHz I²C Clock Generator for Mobile Pentium^®III / Rambus Systems

Preliminary

Spread Spectrum Clock Generation (SSCG)(Cont.)

In this device Spread Spectrum is enabled By I2C, byte0, bit0. At power up, this byte0, bit0 defaults to a high (Spread

Spectrum disabled), therefore, in order to enable the Spread Spectrum feature, byte0, bit0 must be programmed to a

low.

In Down Spread mode the center frequency is shifted down from its rested (non-spread) value by -0.25%. (ex.:

assuming the center frequency is 100MHz in non-spread mode; when down spread is enabled, the center frequency

shifts to 99.75MHz.).

In Center Spread mode, the Center frequency remains the same as in the non-spread mode.

Spread Spectrum effects only CPU, 3V66(0:2), PCI(_F,0:6), and IOAPIC(0:1) outputs.

Down Spread

Center Spread

Fig.6A

Fig.6B

Spread Spectrum Bandwidth Selection Table.

SST2 SST1 SST0

Bandwidth

+/- 0.625%

+/- 0.5%

+/-0.35%

+/-0.25%

-2.5%

Direction

Center

Down

-1%

Down

- 0.7%

Down

- 0.5%

Down (default)

Table 4.

INTERNATIONAL MICROCIRCUITS, INC 525 LOS COCHES ST.

MILPITAS, CA 95035, USA TEL: 408-263-6300 FAX 408-263-6571

Rev 1.0

11/1/1999

Page 8 of 17

http://www.imicorp.com

1...5 6 789 10 11...17

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