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

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MK1491E-14RTR

Manufacturer Part Number
MK1491E-14RTR
Description
IC CLK SRC OPTI ACPI FIRE 28QSOP
Manufacturer
IDT, Integrated Device Technology Inc
Type
Clock/Frequency Synthesizerr
Datasheet

Specifications of MK1491E-14RTR

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
-
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
PS
XO
XI
Oscillator
VDD
Crystal
3
OPTi ACPI Firestar Clock Source
GND
HOST/PCI
Clocks
Fixed
Clock
4
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)
1
HS
Host/2
33M
VDD
MUX
HOST5-7
VDD
Output
Buffers
Output
Output
Output
Output
Buffers
Output
Buffers
Buffer
Buffer
Buffer
HOST1-4
4
2
5
MK1491-14
Revision 061801
HOST 5, 7
F2
PCI 1:5
14.318 MHz
HOST1:4
EHOST6
F1

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MK1491E-14RTR 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

... Ordering Information Part/Order Number MK1491E-14R MK1491E-14RTR External Components The MK1491 requires some inexpensive external components for proper operation. Decoupling capacitors of 0.1µF should be connected on each VDD pin to ground, as close to the MK1491 as possible. A series termination resistor of 33 discussion on page 4 for other external resistors required for proper I/O operation. The 14.318 MHz oscillator has internal caps that provide the proper load for a parallel resonant crystal with C L =18pF. For tuning with other values the formula 2• ...

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