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MK1491-09のメーカーはIntegrated Circuit Systemsです、この部品の機能は「AMD Geode GX2 Clock Source」です。 |
部品番号 | MK1491-09 |
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部品説明 | AMD Geode GX2 Clock Source | ||
メーカ | Integrated Circuit Systems | ||
ロゴ | |||
このページの下部にプレビューとMK1491-09ダウンロード(pdfファイル)リンクがあります。 Total 8 pages
MK1491-09
AMD Geode™ GX2 Clock Source
Description
The MK1491-09 is a low-cost, low-jitter,
high-performance clock synthesizer for AMD’s
Geode-based computer and portable appliance
applications. Using patented analog Phased-Locked
Loop (PLL) techniques, the device accepts a 14.318
MHz crystal input to produce multiple output clocks. It
provides selectable PCI local bus clocks, 48 MHz
clocks for Super I/O and USB, as well as multiple
Reference outputs.
The device has multiple power-down modes to reduce
power consumption.
Block Diagram
VDD
6
GND
6
Features
• Packaged in 28-pin SSOP (209 mil body)
• Available in Pb (lead) free packaged
• Provides all critical timing for the AMD Geode
companion chip
• Four selectable PCI clocks
• Three LPC interface clocks
• One Fixed 66 MHz clock
• 2 Reference clocks
• 48 MHz USB and 48 MHz IO support
• Power down mode
• Low EMI Enable pin reduces EMI radiation on PCI
clocks, LCLKS, and 66 MHz clock
• Operating voltage of 3.3 V ±5%
Sel66/33#
PD#
Clocks
4 PCI (66/33 MHz)
3 LCLK (33 MHz)
66 MHz
14.31818 MHz
crystal
XI
XO
Crystal
Oscillator
USB
Clock
48/TS#
48 MHz
REFCLK1
REFCLK0/Spread#
MDS 1491-09 G
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Revision 080204
Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
1 Page MK1491-09
AMD Geode™ GX2 Clock Source
Power Down Control Table
PD#
0
1
Functions
All clocks are stopped low.
All clocks are running.
Power-on Default Conditions
Pin #
14
27
17
10
Function
TS#
Spread#
PD#
Sel66/33
Default
Condition
H All outputs enabled.
H Spread disabled.
H PCI clocks set to 33.3 MHz. Refer to Power Down Control Table above.
H PCI frequency = 66 MHz.
MDS 1491-09 G
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Revision 080204
Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
3Pages MK1491-09
AMD Geode™ GX2 Clock Source
AC Electrical Characteristics
Unless stated otherwise, VDD = 3.3 V, Ambient Temperature 0 to +70° C
Parameter
Symbol
Conditions
Min. Typ. Max. Units
Input Frequency
Output Clock Skew Rate (PCI
and LPC), load = 30 pF
FIN
Between 0.4 V and 2.4 V
14.31818
4
MHz
V/ns
Output Clock Rise and Fall
Time (all but PCI and LPC),
load=pF
tOR, tOF Between 0.4 V and 2.4 V 0.5
2 ns
Output Clock Duty Cycle, all
MHz Clocks
tOD At 1.5 V
40 60 %
PCI Output to Output Skew, at
33 MHz
Rising edges at 1.5 V
500 ps
PCI Output to Output Skew, at
66 MHz
Rising edges at 1.5 V
250 ps
LPC Output to Output Skew
Rising edges at 1.5 V
500 ps
PCI to LPC Output to Output
Skew (note 1)
Rising edge at 1.5 V
500 ns
Cycle-to-Cycle Jitter, PCICLK
300 ps
Cycle-to-Cycle Jitter, LPCCLK
500 ps
Cycle-to-Cycle Jitter, USBCLK
and 48 MHz
500 ps
Cycle-to-Cycle Jitter, REFCLKs
1400 ps
Power-on Time, applied VDD to
all Clocks Stable
5 ms
Load Capacitance Crystal
18 pF
Note 1: Only valid when PCI is at 33 MHz.
Thermal Characteristics
Parameter
Symbol Conditions
Thermal Resistance Junction to
Ambient
θJA Still air
θJA 1 m/s air flow
θJA 3 m/s air flow
Thermal Resistance Junction to Case θJC
Min.
Typ.
100
80
67
60
Max.
Units
°C/W
°C/W
°C/W
°C/W
MDS 1491-09 G
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Revision 080204
Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
6 Page | |||
ページ | 合計 : 8 ページ | ||
|
PDF ダウンロード | [ MK1491-09 データシート.PDF ] |
データシートを活用すると、その部品の主な機能と仕様を詳しく理解できます。 ピン構成、電気的特性、動作パラメータ、性能を確認してください。 |
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