MK1491E-14R IDT, Integrated Device Technology Inc, MK1491E-14R Datasheet

MK1491E-14R

Manufacturer Part Number

MK1491E-14R

Description

IC CLK SRC OPTI ACPI FIRE 28QSOP

Manufacturer

IDT, Integrated Device Technology Inc

Type

Clock/Frequency Synthesizerr

Datasheet

1.MK1491E-14RLFTR.pdf (4 pages)

Specifications of MK1491E-14R

Input

Crystal

Frequency - Max

75MHz

Voltage - Supply

3 V ~ 3.6 V

Operating Temperature

0°C ~ 70°C

Mounting Type

Surface Mount

Package / Case

28-QSOP

Frequency-max

75MHz

Lead Free Status / RoHS Status

Contains lead / RoHS non-compliant

Output

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

MK1491E-14R

Manufacturer:

ICS

Quantity:

772

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MDS 1491-14 B

Integrated Circuit Systems, Inc. • 525 Race Street • San Jose •CA •95126 • (408)295-9800tel • www.icst.com

Description

The MK1491-14 is a low cost, low jitter, high

performance clock synthesizer for OPTi’s

Firestar and Firestar+ chipsets for Pentium™

Processor-based mobile computer applications.

Using analog Phase-Locked Loop (PLL)

techniques, the device uses a 14.318 MHz

crystal input to produce multiple output

clocks up to 75 MHz. It provides selectable

Host and PCI local bus clocks as well as

selectable clocks for Super I/O or Universal

Serial Bus (USB). The device has up to seven

Host output clocks.

The chip has three different power down

modes that reduce power on various clocks.

Block Diagram

Synch./Asynch. PCI

14.31818 MHz

crystal

Low EMI Enable

SLOW#

STOP#

SEL0

SEL1

FS1:0

Oscillator

VDD

Crystal

OPTi ACPI Firestar Clock Source

GND

HOST/PCI

Clocks

Fixed

Clock

Features

• Packaged in 28 pin, 150 mil wide SSOP

• Provides all critical timing for OPTi ACPI Firestar

• Early Host clock of 3.5ns

• Separate VDD and skew adjust for Host 5,6, and 7

• 48MHz USB, 24MHz SIO, and Audio clock support

• Single pin CPU(Host) slowdown to 33.3MHz

• Multiple power down modes

• Low EMI Enable pin reduces EMI radiation (patent

and Firestar+

supports field upgrade to Firestar+ and new 2.5V

processors

pending)

Host/2

33M

VDD

MUX

HOST5-7

VDD

Output

Buffers

Output

Buffers

Output

Buffers

Buffer

HOST1-4

MK1491-14

Revision 061801

HOST 5, 7

PCI 1:5

14.318 MHz

HOST1:4

EHOST6

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MK1491E-14R Summary of contents

Page 1

Description The MK1491- low cost, low jitter, high performance clock synthesizer for OPTi’s Firestar and Firestar+ chipsets for Pentium™ Processor-based mobile computer applications. Using analog Phase-Locked Loop (PLL) techniques, the device uses a 14.318 MHz crystal input to ...

Page 2

Pin Assignment VDD X14I 2 X14O GND 14.3(HS HOST1 22 HOST2 7 21 VDD HOST1 HOST3 19 10 HOST4 18 11 GND 17 12 HOST5 16 ...

Page 3

Electrical Specifications Parameter ABSOLUTE MAXIMUM RATINGS (note 1) ABSOLUTE MAXIMUM RATINGS (note 1) Supply voltage, VDD Inputs and Clock Outputs Ambient Operating Temperature Soldering Temperature Storage temperature DC CHARACTERISTICS (VDD = 3.3V or 2.5V unless noted) DC CHARACTERISTICS (VDD = ...

Page 4

... Integrated Circuit Systems, Inc. • 525 Race Street • San Jose •CA •95126 • (408)295-9800tel • www.icst.com OPTi ACPI Firestar Clock Source resistors are the normal output resistor pulls low to generate a logic 45° A Marking Low EMI Feature MK1491E-14R Yes MK1491E-14R Yes I/O For select = 0 (low) For select I (high) 28 pin SSOP Inches Inches ...

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