Datasheet > CY2278APAC-1LT

CY2278APAC-1LT

更新时间： 2024-11-21 15:43:59

品牌	Logo	应用领域
赛普拉斯 - CYPRESS		时钟光电二极管外围集成电路晶体
页数	文件大小	规格书
11页	152K
描述
Processor Specific Clock Generator, 75MHz, CMOS, PDSO48, 6 X 12 MM, TSSOP-48

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技术参数
数据手册

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CY2278APAC-1LT 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：	5.84
JESD-30 代码：	R-PDSO-G48	长度：	12.5 mm
端子数量：	48	最高工作温度：	70 °C
最低工作温度：		最大输出时钟频率：	75 MHz
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
主时钟/晶体标称频率：	14.318 MHz	认证状态：	Not Qualified
座面最大高度：	1.2 mm	最大供电电压：	3.465 V
最小供电电压：	3.135 V	标称供电电压：	3.3 V
表面贴装：	YES	技术：	CMOS
温度等级：	COMMERCIAL	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

CY2278APAC-1LT 数据手册

CY2278A

Pentium /II Clock Synthesizer/Driver for Mobile PCs

with Intel 82430TX and No SDRAM

voltage applied on pin 42. There are ten PCI clocks, running

at one half the CPU clock frequency. Free-running PCI and

CPU clocks are available as options shown in the selector

guide. Additionally, the part outputs two 3.3V USB/IR clocks at

48 MHz, one Keyboard clock at 8 MHz, one 2.5V IOAPIC clock

at 14.318 MHz, and two 3.3V reference clocks at 14.318 MHz.

Features

• Mixed 2.5V and 3.3V operation

• Complete clock solution to meet requirements of mo-

bile Pentium® and Pentium® II motherboards

— Seven CPU clock outputs (three at 3.3V, and four at

2.5V or3.3V) with eightselectable clock frequencies.

The CY2278 family contains several features for output flexi-

bility and power control. The CPU, PCI, USB and IR clock fre-

quencies are all factory EPROM-programmable. Three hard-

ware select inputs support eight CPU clock frequencies from

20 – 75 MHz. Additionally, each of the CPU, PCI, and USB/IR

clock sets can be turned on or off with a dedicated enable input

pin for power management.

— Ten 3.3V synchronous PCI clock outputs

— Two 3.3V USB/IR clocks at 48 MHz

— One Keyboard clock at 8 MHz

— One 2.5V IOAPIC clock at 14.318 MHz

— Two 3.3V Ref. clocks at 14.318 MHz

• Dedicated power management for portable systems

The CY2278A outputs are designed for low EMI emissions.

Controlled rise and fall times, unique output driver circuits and

factory-EPROM programmable output drive and slew-rate en-

able optimal configurations for EMI control.

— Separate output enable pins for CPU, PCI, and

USB/IR clock sets

— Free-running PCI and CPU clocks (see options)

CY2278A Selector Guide

• Factory-EPROM programmable output drive and slew

rate for EMI customization

• Custom configuration with factory-EPROM program-

mable CPU, PCI, and USB/IR frequencies.

• Low skew and low jitter outputs

• Available in space-saving 48-pin TSSOP package

Clock Outputs

CPU@3.3V

-1L

-2L

-3L

-4L

[1]

CPU@2.5/3.3V

PCI (CPU/2MHz)

USB/IR (48MHz)

KB (8MHz)

[2]

Functional Description

IOAPIC (14.318 MHz)

Ref (14.318MHz)

CPU-PCI delay

The CY2278A is a Clock Synthesizer/Driver chip for Pentium,

or Pentium II portable PCs designed with the 82430TX or sim-

ilar core-logic chipsets. There are four options available as

shown in the selector guide.

0 ns

0 ns 1–5 ns 0 ns

Notes:

The CY2278A outputs seven CPU clocks, three of which run

at 3.3V and four run at either 2.5V or 3.3V, depending on the

1. One free-running CPU clock.

2. Two free-running PCI clocks.

2.5–3.3V Driver

IOAPIC

Logic Block Diagram

14.318 MHz

REF[0-1]

X_IN

96 MHz

OSC.

PLL0

48 MHz

OUT

USBCLK/IRCLK

CLK8MHz

USB_RUN

8 MHZ

/12

2.5–3.3V Driver

XCPUCLK [0-2]

CPUCLK

SEL2

SEL1

SEL0

PLL1

EPROM

XCPUCLK3_F

on -1L only; not free-

running on -2L, -3L, -4L

CPUCLK [0-2]

CPU_RUN

PCICLK

PCICLK [2-9]

PCICLK_F [0-1]

on -1L, -3L, -4L only; not free-

PCI_RUN

running on -2L

Intel and Pentium are registered trademarks of Intel Corporation.

Cypress Semiconductor Corporation

•

3901 North First Street

•

San Jose

•

CA 95134

•

408-943-2600

October 14, 1999

12 3 4 5 6 7...11

中文翻译

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与CY2278APAC-1LT相关器件

型号	品牌	获取价格	描述	数据表
CY2278APAC-2	CYPRESS	获取价格	Processor Specific Clock Generator, 75MHz, MOS, PDSO48, TSSOP-48
CY2278APAC-3	CYPRESS	获取价格	Processor Specific Clock Generator, 75MHz, MOS, PDSO48, TSSOP-48
CY2278APAC-3L	CYPRESS	获取价格	Processor Specific Clock Generator, 75MHz, CMOS, PDSO48, 6 X 12 MM, TSSOP-48
CY2278APAC-4	CYPRESS	获取价格	Processor Specific Clock Generator, 75MHz, MOS, PDSO48, TSSOP-48
CY2278APAC-4L	CYPRESS	获取价格	Processor Specific Clock Generator, 75MHz, CMOS, PDSO48, 6 X 12 MM, TSSOP-48
CY2278APAC-4LT	CYPRESS	获取价格	Processor Specific Clock Generator, 75MHz, CMOS, PDSO48, 6 X 12 MM, TSSOP-48
CY2278APC-1L	ETC	获取价格	CPU System Clock Generator
CY2278APC-1LT	CYPRESS	获取价格	Processor Specific Clock Generator, 75MHz, CMOS, PDSO48, TSSOP-48
CY2278APC-2L	ETC	获取价格	CPU System Clock Generator
CY2278APC-2LT	CYPRESS	获取价格	Processor Specific Clock Generator, 75MHz, CMOS, PDSO48, TSSOP-48

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