Datasheet > CY2280PVC-1

CY2280PVC-1

更新时间： 2024-11-25 04:37:55

品牌	Logo	应用领域
SPECTRALINEAR		晶体驱动器外围集成电路光电二极管电脑 PC 时钟
页数	文件大小	规格书
11页	170K
描述
100 MHz Pentium㈢ II Clock Synthesizer/Driver with Spread Spectrum for Mobile or Desktop PCs

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CY2280PVC-1 数据手册

Y2280

CY2280

100 MHz Pentium^®II Clock Synthesizer/Driver with Spread

Spectrum for Mobile or Desktop PCs

Features

Functional Description

The CY2280 is a Spread Spectrum clock synthesizer/driver for

a Pentium II, or other similar processor-based PC requiring

100-MHz support. All of the required system clocks are

provided in a space-saving 48-pin SSOP package. The

CY2280 can be used with the CY231x for a total solution for

systems with SDRAM.

• Mixed 2.5V and 3.3V operation

• Clock solution for Pentium® II, and other similar

processor-based motherboards

— Four 2.5V CPU clocks up to 100 MHz

— Eight 3.3V sync. PCI clocks, one free-running

— Two 3.3V 48-MHz USB clocks

The CY2280 provides the option of spread spectrum clocking

on the CPU and PCI clocks for reduced EMI. A downspread

percentage is introduced when the SEL_SS input is asserted.

The device can be run without spread spectrum when the

SEL_SS input is deasserted. The percentage of spreading is

EPROM-programmable to optimize EMI-reduction.

— Three 3.3V Ref. clocks at 14.318 MHz

— Two 2.5V APIC clocks at 14.318 MHz or PCI/2

• EMI control

— Spread spectrum clocking

The CY2280 has power-down, CPU stop, and PCI stop pins

for power management control. The signals are synchronized

on-chip, and ensure glitch-free transitions on the outputs.

When the CPU_STOP input is asserted, the CPU clock

outputs are driven LOW. When the PCI_STOP input is

asserted, the PCI clock outputs (except the free-running PCI

clock) are driven LOW. When the PWR_DWN pin is asserted,

the reference oscillator and PLLs are shut down, and all

outputs are driven LOW.

— Factory-EPROM programmable spread spectrum

margin

— Factory-EPROM programmable output drive and

slew rate

• Factory-EPROM programmable CPU clock frequencies

for custom configurations

• Available in space-saving 48-pin SSOP package

Table 1. CY2280 Selector Guide.

CY2280 Configuration Options

Clock Outputs

CPU (66.6, 100 MHz)

–1

–11S

–21S

PCI (CPU/2, CPU/3)

USB (48 MHz)

APIC (14.318 MHz)

APIC (PCI/2)

—

Reference (14.318 MHz)

CPU-PCI delay

1.5ꢀ4.0 ns

—

1.5ꢀ4.0 ns

—

1.5ꢀ4.0 ns

2.0–4.5 ns

ꢀ0.6%

CPU-APIC delay

Spread Spectrum (Downspread)

N/A

ꢀ0.6%

Logic Block Diagram

-1

-2

APIC [0:1]

V_DDAPIC

CPU_STOP

REF [0-2]

XTALIN

14.318

MHz

OSC.

V_DDREF

XTALOUT

STOP

LOGIC

CPU

PLL

CPUCLK [0-3]

V_DDCPU

Divider

PWR_DWN

PCICLK_F

V_DDPCI

SEL0

SEL1

Delay

EPROM

SEL100

SEL_SS

STOP

LOGIC

PCI [1-7]

V_DDPCI

PCI_STOP

SYS PLL

USBCLK [0:1]

V_DDUSB

Rev 1.0, November 25, 2006

2200 Laurelwood Road, Santa Clara, CA 95054

Page 1 of 11

www.SpectraLinear.com

Tel:(408) 855-0555 Fax:(408) 855-0550

12 3 4 5 6 7...11

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与CY2280PVC-1相关器件

型号	品牌	获取价格	描述	数据表
CY2280PVC-11S	SPECTRALINEAR	获取价格	100 MHz Pentium㈢ II Clock Synthesizer/Driver
CY2280PVC-11S	CYPRESS	获取价格	100-MHz Pentium II Clock Synthesizer/Driver with Spread Spectrum for Mobile or Desktop PCs
CY2280PVC-11ST	CYPRESS	获取价格	Processor Specific Clock Generator, 100MHz, CMOS, PDSO48, SSOP-48
CY2280PVC-13S	CYPRESS	获取价格	Processor Specific Clock Generator, 100MHz, CMOS, PDSO48, SSOP-48
CY2280PVC-14ST	CYPRESS	获取价格	Processor Specific Clock Generator, 100MHz, CMOS, PDSO48, SSOP-48
CY2280PVC-1T	CYPRESS	获取价格	暂无描述
CY2280PVC-2	ETC	获取价格	CPU System Clock Generator
CY2280PVC-21S	CYPRESS	获取价格	100-MHz Pentium II Clock Synthesizer/Driver with Spread Spectrum for Mobile or Desktop PCs
CY2280PVC-21S	SPECTRALINEAR	获取价格	100 MHz Pentium㈢ II Clock Synthesizer/Driver
CY2280PVC-21ST	CYPRESS	获取价格	Processor Specific Clock Generator, 100MHz, CMOS, PDSO48, SSOP-48

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