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MK1491-09 の電気的特性と機能

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。


製品の詳細 ( Datasheet PDF )

部品番号 MK1491-09
部品説明 AMD Geode GX2 Clock Source
メーカ Integrated Circuit Systems
ロゴ Integrated Circuit Systems ロゴ 




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MK1491-09 Datasheet, MK1491-09 PDF,ピン配置, 機能
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
1
Revision 080204
Integrated Circuit Systems, Inc. 525 Race Street, San Jose, CA 95126 tel (408) 297-1201 www.icst.com

1 Page





MK1491-09 pdf, ピン配列
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
3
Revision 080204
Integrated Circuit Systems, Inc. 525 Race Street, San Jose, CA 95126 tel (408) 297-1201 www.icst.com


3Pages


MK1491-09 電子部品, 半導体
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
6
Revision 080204
Integrated Circuit Systems, Inc. 525 Race Street, San Jose, CA 95126 tel (408) 297-1201 www.icst.com

6 Page



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