Datasheet > MK1442

MK1442

更新时间： 2024-11-30 22:30:07

品牌	Logo	应用领域
矽成 - ICSI		以太网时钟
页数	文件大小	规格书
4页	71K
描述
SCSI and Ethernet Clock Source

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数据手册

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MK1442 数据手册

MK1442/MK1443

SCSI and Ethernet Clock Source

Features

Description

The MK1442/3 are the ideal way to generate

clocks for desktop computer motherboards and

LAN workstations. Using analog Phase-Locked

Loop (PLL) techniques, the devices accept a

14.318 MHz crystal input to produce multiple

output clocks up to 100 MHz. They provide

2XCPU, CPU, floppy controller, keyboard,

system, SCSI and Ethernet clocks. The MK1442/3

are perfect for new Pentium™ Processor, PCI bus

and 486 systems. The devices can operate at 5V or

3.3V up to and including 80MHz on the CPU

clock.

• Provides exact frequency Ethernet and SCSI clocks

• 5V or 3.3V (up to 80MHz) operation

• Output clock frequencies up to 100 MHz

• Pentium™ Processor compatible timing

• 486 compatible smooth frequency transitions

• Seven or eight output clocks

• Compatible with X86 and 680X0 CPUs

• Skew controlled 2X and 1X CPU to within 250ps

• Packaged in 16 pin skinny SOIC or PDIP

• Duty cycle of 47.5/52.5 up to 66.66 MHz

• Duty cycle of 45/55 up to 100 MHz

• Total of 15 different selectable CPU frequencies

• Tri-state outputs for board level testing

• 25mA drive capability at TTL levels

• Keyboard frequencies of 12MHz (-01),

8MHz (-02), or 16MHz (-03)

The devices are identical except the MK1442 has

an Output Enable (OE) pin that tri-states all

outputs when taken low, and the MK1443 has an

extra 14.318 MHz clock.

• Advanced, low power CMOS process

• MK1442 - output enable

• MK1443 - two 14.318 MHz outputs

Block Diagram

VDD

GND

Output

2XCPU

Buffer

CPUS0

CPUS1

Output

÷2

CPU

Buffer

Output

Buffer

8.00, 12.00,

or 16.00 MHz

Clock Synthesis

and Control

Circuitry

Output

Buffer

24.00 MHz

40.000 MHz

20.000 MHz

Output

Buffer

14.318 MHz

crystal

Output

Buffer

Output

Buffer

14.318 MHz

(MK1443 only)

Crystal

Oscillator

Output

Buffer

14.318 MHz

OE (all outputs, MK1442 only)

MDS 1442/3 E

Revision 111500

Printed 11/15/00

Integrated Circuit Systems, Inc. • 525 Race Street • San Jose • CA • 95126 •(408)297-1201tel • www.icst.com

12 3 4

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与MK1442相关器件

型号	品牌	获取价格	描述	数据表
MK1442-01S	ICSI	获取价格	SCSI and Ethernet Clock Source
MK1442-01STR	IDT	获取价格	Processor Specific Clock Generator, 100MHz, CMOS, PDSO16, SKINNY, SOIC-16
MK1442-01STRLF	IDT	获取价格	Processor Specific Clock Generator, 100MHz, CMOS, PDSO16, SKINNY, SOIC-16
MK1442-02S	ICSI	获取价格	SCSI and Ethernet Clock Source
MK1442-02SLF	IDT	获取价格	Processor Specific Clock Generator, 100MHz, CMOS, PDSO16, 0.150 INCH, SKINNY, SOIC-16
MK1442-02STRLF	IDT	获取价格	Processor Specific Clock Generator, 100MHz, CMOS, PDSO16, 0.150 INCH, SKINNY, SOIC-16
MK1442-03S	ICSI	获取价格	SCSI and Ethernet Clock Source
MK1442-03SLF	IDT	获取价格	Processor Specific Clock Generator, 100MHz, CMOS, PDSO16, 0.150 INCH, SKINNY, SOIC-16
MK1442-03STR	IDT	获取价格	Processor Specific Clock Generator, 100MHz, CMOS, PDSO16, 0.150 INCH, SKINNY, SOIC-16
MK1443-01S	ICSI	获取价格	SCSI and Ethernet Clock Source