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MK1491-06
AMD GeodeTM 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.
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%
Block Diagram
VDD
6
GND
5
PCI Frequency Select Low EMI Enable PCIF Function Enable Early PCI Enable SLOW# PCISTP# PWRDWN# Audio Select
2
3
PCI Clocks
PCI EPCI/PCI
Audio Clock Fixed Clocks
16.394 MHz or 24.576 MHz or 49.152 MHz 48 MHz MUX 14.318 MHz or 24 MHz
3
14.3M/24M Select
XI
14.31818 MHz crystal
Crystal Oscillator
14.318 MHz
XO
MDS 1491-06 J Integrated Circuit Systems, Inc.
1
525 Race Street, San Jose, CA 95126
Revision 110204 tel (408) 297-1201
www.icst.com
MK1491-06 AMD GeodeTM Clock Source
Pin Assignment
VDD XI XO GND 14.3M (TS) 14.3M GND 14.3M (SEL AUDIO) VDD SLOW# GND FS SEL24 VDD 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 AC97 AUDIO (PEN) PCI VDD PCI PCI GND PCI (EPCI#) 48M (LE#) VDD 24M/14.3M VDD GND PCISTP# PWRDWN#
PCI Frequency Select Table
TS 0 0 M M 1 1 FS 0 1 0 1 0 1 PCI Tristate all clocks Reserved 30 MHz 33.3 MHz 25 MHz 37.5 MHz
24M/14.3M Frequency Select Table
SEL24 0 1 24.0 MHz 24M/14.3M 14.31818 MHz
PCIF Enable Control
PEN Pin 25 PCI PCI PCIF Pin 24 PCI PCIF PCIF
Early PCI Control Table
EPCI# 0 1 PCI (Pin 22) 1 ns early Normal
0 M 1
PCIF continues to run in PCI STOP mode. See table on page 4.
EMI Control
LE# 0 1 ON OFF PCI Low EMI
AC97 Audio Frequency Select
SEL AUDIO 0 M 1 AC97 AUDIO 16.9344 MHz 24.576 MHz 49.152 MHz
Spread direction is DOWN.
Pin Descriptions
Pin Number
1, 9, 14 2 3 4, 7, 11, 17, 23 5 6
Pin Name
VDD XI XO GND 14.3M (TS) 14.3M
Pin Type
P I O P TI/O O
Pin Description
Connect to +3.3 V. Must be same voltage on all pins. Crystal connection. Connect to a 14.31818 MHz crystal or input clock. Crystal connection. Connect to a 14.31818 MHz crystal, or leave unconnected for clock. Connect to Ground. 14.318 MHz output. Input control for all clocks per table above. 14.318 MHz buffered reference clock output.
MDS 1491-06 J Integrated Circuit Systems, Inc.
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525 Race Street, San Jose, CA 95126
Revision 110204 tel (408) 297-1201
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MK1491-06 AMD GeodeTM Clock Source
Pin Number
8 10 12 13 15 16 18, 20, 26 19 21 22 24 25 27 28
Pin Name
14.3M (SEL AUDIO) SLOW# FS SEL24 PWRDWN# PCISTP# VDD 24M/14.3M 48 (LE#) PCI (EPCI#) PCI PCI PCI AC97 AUDIO (PEN)
Pin Type
TI/O I I I I I P O I/O I/O O O O TI/O
Pin Description
14.318 MHz output and audio frequency select input per table above. PCI normal or slow mode select input per table on page 4. Frequency Select for PCI clocks per table above. Fixed frequency select input per table above. Selects frequency on pin 19. Power down control; defined in table on page 4. PCI Stop power down control; defined in table on page 4. Connect to +3.3 V. Must be same voltage on all pins. Fixed frequency clock output per table above. Fixed frequency clock output and low EMI (spread spectrum) enable input per table above. PCI Output clock that can be early. Input control for Early PCI per table above. PCI Output clock. PCI/PCIF control set by PEN per table above. PCI Output clock. PCI/PCIF control set by PEN per table above. PCI Output clock. Audio clock output and PCIF Function Enable per table above.
KEY: I = Input TI = Tri-level O = Output P = Power supply connection (T)I/O = Input on power up, becomes an Output after 10 ms Weak internal pull-up resistors are present on SEL24, EPCI#, FS, LE#, PCISTP#, and SLOW#. These pins should be tied to VDD or GND, and not be left floating. Internal resistors on PEN, SEL AUDIO, and TS pull to mid-level (M).
MDS 1491-06 J Integrated Circuit Systems, Inc.
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525 Race Street, San Jose, CA 95126
Revision 110204 tel (408) 297-1201
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MK1491-06 AMD GeodeTM Clock Source
Power Down Control Table
PCISTP# PWRDWN# SLOW#
X 0 0 1 X X
MODE
Power down PCI STOP
PCI
LOW LOW
PCIF
LOW ON
24/14.3
LOW ON
14.3
LOW ON
Description
All outputs low. PLL's and oscillators off. PCI clocks synchronously enter and leave low state. All clocks on.
1
1
X
ON
ON
ON
ON
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 k 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
M M 1 1 1 1 1 1 1 M All outputs enabled.
Condition
Audio clock (pin 28) set to 24.576 MHz PCI clocks set to 33.3 MHz. Refer to Power Down Control Table above. PCI frequency = 33.3 MHz. 24M/14.3M (pin 19) set to 24 MHz. All clocks running. PCI clocks running. Low EMI function OFF Pin 22 set to normal PCI signal (not early). PCI (pin 25) set to PCI clock (33.33 MHz). PCI (pin 24) set to PCIF clock (33.33 MHz).
MDS 1491-06 J Integrated Circuit Systems, Inc.
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525 Race Street, San Jose, CA 95126
Revision 110204 tel (408) 297-1201
www.icst.com
MK1491-06 AMD GeodeTM Clock Source
External Components
The MK1491-06 requires some inexpensive external components for proper operation. Decoupling capacitors of 0.1F should be connected on each VDD pin to ground, as close to the MK1491-06 as possible. A series termination resistor of 33 may be used for each clock output. See the discussion below for other external resistors required for proper I/O operation. The 14.3 MHz oscillator has internal caps that provide the proper load for a parallel resonant crystal with CL=18 pF. For tuning with other values of CL, the formula 2*(CL-18) gives the value of each capacitor that should be connected between X1 and ground and X2 and ground.
I/O Structure
The MK1491-06 provides more functionality in a 28-pin package by using a unique I/O technique. The device checks the status of all I/O pins during power-up and at exit from the Power Down state. This status (pulled high, low, or mid-level) then determines the frequency selections and power down modes (see the tables on pages 2 and 4). Within 10ms after power up, the inputs change to outputs and the clocks start up. In the diagrams to the right, the 33 resistors are the normal output termination resistors. The 10k resistor pulls low to generate a logic zero. Weak internal pull-up resistors are present on SEL24, EPCI#, FS, LE#, PCISTP#, and SLOW#. These pins should be connected directly to VDD or GND if not under active control. Internal resistors on PEN, SEL AUDIO, and TS pull to a mid-level (M).
33 For select = 0 (low) I/O 10 k
Do not stuff for "1" selection
To load*
*Note: Do not use a TTL load. This will overcome the 10 k pull-down and force the input to a logic 1.
MDS 1491-06 J Integrated Circuit Systems, Inc.
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525 Race Street, San Jose, CA 95126
Revision 110204 tel (408) 297-1201
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MK1491-06 AMD GeodeTM Clock Source
Absolute Maximum Ratings
Stresses above the ratings listed below can cause permanent damage to the MK1491-06. These ratings, which are standard values for ICS commercially rated parts, are stress ratings only. Functional operation of the device at these or any other conditions above those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods can affect product reliability. Electrical parameters are guaranteed only over the recommended operating temperature range.
Item
Supply Voltage, VDD All Inputs and Outputs Ambient Operating Temperature Storage Temperature Junction Temperature Soldering Temperature 7V
Rating
-0.5 V to VDD+0.5 V 0 to +70C -65 to +150C 125C 260C
Recommended Operation Conditions
Parameter
Ambient Operating Temperature Power Supply Voltage (measured in respect to GND)
Min.
0 +3.15
Typ.
+3.3
Max.
+70 +3.45
Units
C V
DC Electrical Characteristics
Unless stated otherwise, VDD = 3.3 V 5%, Ambient Temperature 0 to +70C
Parameter
Operating Voltage Input High Voltage Input Mid-level Voltage Input Low Voltage Output High Voltage Output Low Voltage Output High Voltage Operating Supply Current Power Down Mode Supply Current Short Circuit Current, SIngle Output Driver Input Capacitance
Symbol
VDD VIH VIM VIL VOH VOL VOH IDD
Conditions
Min.
3.15 2 1.2
Typ.
3.3
Max.
3.45
Units
V V
1.4
1.6 0.8
V V V
IOH = -8 mA IOL = 8 mA IOH = -8 mA 33 MHz, no load
2.4 0.4 VDD-0.4 30 15
V V mA A mA pF
VDD = 3.3 V CIN
60 7
MDS 1491-06 J Integrated Circuit Systems, Inc.
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525 Race Street, San Jose, CA 95126
Revision 110204 tel (408) 297-1201
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MK1491-06 AMD GeodeTM Clock Source
AC Electrical Characteristics
Unless stated otherwise, VDD = 3.3 V 5%, Ambient Temperature 0 to +70 C
Parameter
Input Frequency Output Clock Rise Time Output Clock Fall Time Output Clock Duty Cycle, all MHz Clocks PCI Output to Output Skew Skew of EPCI with respect to PCI Cycle-to-Cycle Jitter, PCI clocks EMI Reduction, peaks of 5th 19th odd harmonics Power-up Time, PWRDWN# High to all Clocks Stable Power-on Time, applied VDD to all Clocks Stable
Symbol
FIN tOR tOF tOD
Conditions
20% to 80% 80% to 20% At 1.5 V Rising edges at 1.5 V
Min.
Typ.
14.31818
Max.
1.5 1.5
Units
MHz ns ns % ps ns ps
45
49 to 51
55 500
1 250 33.3 MHz PCI Clock 6 8 12 11 20 25
dB ms ms
Thermal Characteristics
Parameter
Thermal Resistance Junction to Ambient
Symbol
JA JA JA JC
Conditions
Still air 1 m/s air flow 3 m/s air flow
Min.
Typ.
100 80 67 60
Max. Units
C/W C/W C/W C/W
Thermal Resistance Junction to Case
MDS 1491-06 J Integrated Circuit Systems, Inc.
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525 Race Street, San Jose, CA 95126
Revision 110204 tel (408) 297-1201
www.icst.com
MK1491-06 AMD GeodeTM Clock Source
Marking Diagram
28 15
IC S
###### YYWW MK1491-06R
14
1
Notes: 1. ###### is the lot code. 2. YYWW is the last two digits of the year, and the week number that the part was assembled.
MDS 1491-06 J Integrated Circuit Systems, Inc.
8
525 Race Street, San Jose, CA 95126
Revision 110204 tel (408) 297-1201
www.icst.com
MK1491-06 AMD GeodeTM Clock Source
Package Outline and Package Dimensions (28-pin SOIC, 150 mil Body)
Package dimensions are kept current with JEDEC Publication No. 95, MO-153
N
C
Millimeters
L
Inches Min Max
Symbol
Min
Max
INDEX AREA
E
H
12 D
h x 45
A A1 SEATING PLANE .10 (.004)
A A1 B C D E e H h L
2.65 0.10 0.33 0.51 0.18 0.32 17.70 18.40 7.40 7.60 1.27 Basic 10.00 10.65 0.25 0.75 0.40 1.27 0 8
0.104 .0040 .013 .020 .007 .013 .697 .724 .291 .299 0.050 Basic .394 .419 .010 .029 .016 .050 0 8
e
B
MDS 1491-06 J Integrated Circuit Systems, Inc.
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525 Race Street, San Jose, CA 95126
Revision 110204 tel (408) 297-1201
www.icst.com
MK1491-06 AMD GeodeTM Clock Source
Package Outline and Package Dimensions (28-pin SSOP, 150 mil Body, 0.025 mm Pitch)
Package dimensions are kept current with JEDEC Publication No. 95, MO-153
28
Millimeters Symbol
E1 INDEX AREA E
Inches Min Max
Min
Max
12 D
A 2 A 1
A
A A1 A2 b C D E E1 e L aaa
1.35 1.75 0.10 0.25 -1.50 0.20 0.30 0.18 0.25 9.80 10.00 5.80 6.20 3.80 4.00 0.635 Basic 0.40 1.27 0 8 -0.10
.053 .069 .0040 .010 -.059 .008 .012 .007 .010 .386 .394 .228 .244 .150 .157 0.025 Basic .016 .050 0 8 -0.004
c
-Ce
b SEATING PLANE L
aaa C
Ordering Information
Part / Order Number
MK1491-06R MK1491-06RTR MK1491-06RLF MK1491-06RLFTR MK1491-06S MK1491-06STR MK1491-06SLF MK1491-06SLFTR
Marking
MK1491-06R MK1491-06R MK1491-06RLF MK1491-06RLF MK1491-06S MK1491-06S MK1491-06SLF MK1491-06SLF
Shipping Packaging
Tubes Tape and Reel Tubes Tape and Reel Tubes Tape and Reel Tubes Tape and Reel
Package
28-pin SSOP 28-pin SSOP 28-pin SSOP 28-pin SSOP 28-pin SOIC 28-pin SOIC 28-pin SOIC 28-pin SOIC
Temperature
0 to +70C 0 to +70C 0 to +70C 0 to +70C 0 to +70C 0 to +70C 0 to +70C 0 to +70C
"LF" denotes Pb (lead) free package. While the information presented herein has been checked for both accuracy and reliability, Integrated Circuit Systems (ICS) assumes no responsibility for either its use or for the infringement of any patents or other rights of third parties, which would result from its use. No other circuits, patents, or licenses are implied. This product is intended for use in normal commercial applications. Any other applications such as those requiring extended temperature range, high reliability, or other extraordinary environmental requirements are not recommended without additional processing by ICS. ICS reserves the right to change any circuitry or specifications without notice. ICS does not authorize or warrant any ICS product for use in life support devices or critical medical instruments.
MDS 1491-06 J Integrated Circuit Systems, Inc.
10
525 Race Street, San Jose, CA 95126
Revision 110204 tel (408) 297-1201
www.icst.com

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