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부품번호 | MK1491-06SLFTR 기능 |
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기능 | AMD Geode Clock Source | ||
제조업체 | Integrated Circuit Systems | ||
로고 | |||
전체 10 페이지수
MK1491-06
AMD Geode™ Clock Source
Description
The MK1491-06 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 and AC97 audio
clocks, 24 MHz and 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
Features
• Packaged in 28-pin SOIC or in 28-pin SSOP
• Available in Pb (lead) free
• Provides all critical timing for the AMD Geode
companion chip
• Four PCI clocks
• Selectable PCIF on up to 2 outputs
• Early PCI clock selectability
• Up to 4 Reference clocks
• 48 MHz USB and 24MHz SIO support
• AC97 audio clock
• Multiple power down modes
• Low EMI Enable pin reduces EMI radiation on PCI
clocks (patented)
• Operating voltage of 3.3 V ±5%
VDD
6
GND
5
PCI Frequency Select
Low EMI Enable
PCIF Function Enable
Early PCI Enable
SLOW#
PCISTP#
PWRDWN#
2
PCI
Clocks
3 PCI
EPCI/PCI
Audio Select
14.3M/24M Select
14.31818 MHz
crystal
XI
XO
Crystal
Oscillator
Audio
Clock
Fixed
Clocks
MUX
16.394 MHz or
24.576 MHz or
49.152 MHz
48 MHz
14.318 MHz or
24 MHz
3 14.318 MHz
MDS 1491-06 J
1
Revision 110204
Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
MK1491-06
AMD Geode™ Clock Source
Power Down Control Table
PCISTP# PWRDWN# SLOW# MODE PCI
X 0 X Power down LOW
0 1 X PCI STOP LOW
1 1 X ON ON
PCIF
LOW
ON
ON
24/14.3
LOW
ON
ON
14.3
LOW
ON
ON
Description
All outputs low. PLL’s
and oscillators off.
PCI clocks
synchronously enter
and leave low state.
All clocks on.
Key: 1 = connected to VDD, 0 = connected to ground, X = any valid logic level, combination inputs/outputs
should be connected to VDD or ground through a 10 kΩ resistor as shown below.
Power-on Default Conditions
Pin #
5
8
10
12
13
15
16
21
22
28
Function
TS
SEL AUDIO
SLOW#
FS
SEL 24
PWRDWN#
PCISTP#
LE#
EPCI#
PEN
Default
Condition
M All outputs enabled.
M Audio clock (pin 28) set to 24.576 MHz
1 PCI clocks set to 33.3 MHz. Refer to Power Down Control Table above.
1 PCI frequency = 33.3 MHz.
1 24M/14.3M (pin 19) set to 24 MHz.
1 All clocks running.
1 PCI clocks running.
1 Low EMI function OFF
1 Pin 22 set to normal PCI signal (not early).
M PCI (pin 25) set to PCI clock (33.33 MHz). PCI (pin 24) set to PCIF clock
(33.33 MHz).
MDS 1491-06 J
4
Revision 110204
Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
4페이지 MK1491-06
AMD Geode™ Clock Source
AC Electrical Characteristics
Unless stated otherwise, VDD = 3.3 V ±5%, Ambient Temperature 0 to +70° C
Parameter
Symbol Conditions
Min. Typ.
Input Frequency
Output Clock Rise Time
Output Clock Fall Time
Output Clock Duty Cycle, all
MHz Clocks
FIN
tOR 20% to 80%
tOF 80% to 20%
tOD At 1.5 V
14.31818
45 49 to 51
PCI Output to Output Skew
Rising edges at 1.5 V
Skew of EPCI with respect to
PCI
1
Cycle-to-Cycle Jitter, PCI clocks
250
EMI Reduction, peaks of 5th -
19th odd harmonics
33.3 MHz PCI Clock
6
Power-up Time, PWRDWN#
High to all Clocks Stable
8
Power-on Time, applied VDD to
all Clocks Stable
12
Max.
1.5
1.5
55
500
11
20
25
Units
MHz
ns
ns
%
ps
ns
ps
dB
ms
ms
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 1491-06 J
7
Revision 110204
Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
7페이지 | |||
구 성 | 총 10 페이지수 | ||
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부품번호 | 상세설명 및 기능 | 제조사 |
MK1491-06SLFTR | AMD Geode Clock Source | Integrated Circuit Systems |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |