ICS MK1491-09F

MK1491-09
AMD Geode™ GX2 Clock Source
Description
Features
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.
• Packaged in 28-pin SSOP (209 mil body)
• Available in Pb (lead) free packaged
• Provides all critical timing for the AMD Geode
companion chip
The device has multiple power-down modes to reduce
power consumption.
•
•
•
•
•
•
•
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%
Block Diagram
VDD
GND
6
6
4
Sel66/33#
3
Clocks
PD#
PCI (66/33 MHz)
LCLK (33 MHz)
66 MHz
USB
Clock
48/TS#
48 MHz
REFCLK1
XI
14.31818 MHz
crystal
Crystal
Oscillator
REFCLK0/Spread#
XO
1
MDS 1491-09 G
Integrated Circuit Systems, Inc.
●
525 Race Street, San Jose, CA 95126
Revision 080204
●
tel (408) 297-1201
●
www.icst.com
MK1491-09
AMD Geode™ GX2 Clock Source
Pin Assignment
PCI Frequency Select Table
GND
1
28
VDD
XI
2
27
RefCLK0/Spread#
XO
3
26
RefCLK1
VDD
4
25
VDD
LCLK0/33M
5
24
PCICLK3/33-66M
LCLK1/33M
6
23
PCICLK2/33-66M
GND
7
22
GND
VDD
8
21
GND
LCLK2/33M
9
20
PCICLK1/33-66M
10
19
VDD
GND
11
18
PCICLK0/33-66M
VDD
12
17
PD#
48M
13
16
66M
48M/TS#
14
15
GND
Sel66/33#
Sel66/33#
PCI Frequency
0
33 MHz
1
66 MHz
EMI Control
Spread#
PCI Low EMI
0
ON
1
OFF
Spread direction is DOWN.
Pin Descriptions
Pin
Number
Pin
Name
Pin
Type
Pin Description
1, 7, 11, 15, 21, 22
GND
P
Connect to Ground.
2
XI
I
Crystal connection. Connect to a 14.31818 MHz crystal or input clock.
3
XO
O
Crystal connection. Connect to a 14.31818 MHz crystal, or leave
unconnected.
4, 8, 12, 19, 25, 28
VDD
P
Connect to 3.3 V.
5, 6, 9
LCLK
O
33 MHz low skew clock outputs.
10
Sel66/33#
I
Selects frequency on PCICLK.
13
48M
O
48 MHz clock output.
14
48M/TS#
I/O
48 MHz clock output. TS# is high at power-up.
16
66M
O
66 MHz clock output.
17
PD#
I
Power-down input (see table on page 3).
18, 20, 23, 24
PCICLK
O
33 to 66 MHz PCI synchronous clock outputs with low skew.
26
RefCLK1
O
Buffered reference output of 14.31818 MHz.
27
RefCLK0/
Spread#
I/O
Buffered reference output of 14.31818 MHz. Spread select at
power-up. For Spread#, see 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 TS#, Spread#, PD#, and
Sel66/33.
2
MDS 1491-09 G
Integrated Circuit Systems, Inc.
●
525 Race Street, San Jose, CA 95126
Revision 080204
●
tel (408) 297-1201
●
www.icst.com
MK1491-09
AMD Geode™ GX2 Clock Source
Power Down Control Table
PD#
Functions
0
All clocks are stopped low.
1
All clocks are running.
Power-on Default Conditions
Pin #
Function
Default
14
TS#
H
All outputs enabled.
27
Spread#
H
Spread disabled.
17
PD#
H
PCI clocks set to 33.3 MHz. Refer to Power Down Control Table above.
10
Sel66/33
H
PCI frequency = 66 MHz.
3
MDS 1491-09 G
Integrated Circuit Systems, Inc.
Condition
●
525 Race Street, San Jose, CA 95126
Revision 080204
●
tel (408) 297-1201
●
www.icst.com
MK1491-09
AMD Geode™ GX2 Clock Source
External Components
The MK1491-09 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 MK1491-09 as possible.
A series termination resistor of 33Ω may be used for
each clock output. See the discussion below 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
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 MK1491-09 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. This
status (pulled high or low) then determines the
frequency selections and power down modes (see the
tables on pages 2 and 3). Within 10ms after power up,
the inputs change to outputs and the clocks start up. In
the diagrams below, the 33Ω resistors are the normal
output termination resistors. The 10kΩ resistor pulls
low to generate a logic zero when needed. Weak
internal pull-up resistors are present on TS#, Spread#,
PD#, and Sel66/33 to pull the pin to high when left
floating.
33
For select
= 0 (low)
To load*
I/O
10 k
Do not stuff for
“1” selection
*Note: Do not use a TTL load. This will overcome the
10 kΩ pull-down and force the input to a logic 1.
4
MDS 1491-09 G
Integrated Circuit Systems, Inc.
●
525 Race Street, San Jose, CA 95126
Revision 080204
●
tel (408) 297-1201
●
www.icst.com
MK1491-09
AMD Geode™ GX2 Clock Source
Absolute Maximum Ratings
Stresses above the ratings listed below can cause permanent damage to the MK1491-09. 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
Rating
Supply Voltage, VDD (referenced to VSS)
4.6 V
All Inputs and Outputs (referenced to VSS)
-0.5 V to VDD+0.5 V
Ambient Operating Temperature
0 to +70°C
Storage Temperature
-65 to +150°C
Junction Temperature
125°C
Soldering Temperature (10 seconds max)
260°C
Spread Spectrum Enabled for PCI and LPC Clocks
30 kHz min., 33 kHz max.
DC Electrical Characteristics
Unless stated otherwise, VDD = 3.3 V, Ambient Temperature 0 to +70°C
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Units
3.3
3.46
V
Operating Voltage
VDD
3.13
Input High Voltage
VIH
2
VDD
V
Input Low Voltage
VIL
VSS
0.8
V
Output High Voltage
VOH
IOH = -12 mA
Output Low Voltage
VOL
IOL = 12 mA
0.4
V
Operating Supply Current
IDD
VDD = 3.3 V
60
mA
0.5
mA
2.4
V
Clock Disable Mode
Supply Current
Internal Pull-up Resistor
Input Capacitance
CIN
kΩ
All inputs except XI
5
pF
5
MDS 1491-09 G
Integrated Circuit Systems, Inc.
All inputs except XI
●
525 Race Street, San Jose, CA 95126
Revision 080204
●
tel (408) 297-1201
●
www.icst.com
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
Input Frequency
Conditions
Min.
FIN
Typ.
Max.
14.31818
Output Clock Skew Rate (PCI
and LPC), load = 30 pF
Between 0.4 V and 2.4 V
Output Clock Rise and Fall
Time (all but PCI and LPC),
load=pF
tOR, tOF
Output Clock Duty Cycle, all
MHz Clocks
tOD
Units
MHz
4
V/ns
Between 0.4 V and 2.4 V
0.5
2
ns
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
Thermal Resistance Junction to
Ambient
Thermal Resistance Junction to Case
Min.
Typ.
Max. Units
θJA
Still air
100
°C/W
θJA
1 m/s air flow
80
°C/W
θJA
3 m/s air flow
67
°C/W
60
°C/W
θJC
6
MDS 1491-09 G
Integrated Circuit Systems, Inc.
Conditions
●
525 Race Street, San Jose, CA 95126
Revision 080204
●
tel (408) 297-1201
●
www.icst.com
MK1491-09
AMD Geode™ GX2 Clock Source
Marking Diagram
28
ICS
15
MK1491-09F
######
YYWW
1
14
Marking Diagram (for Pb free)
28
ICS
15
MK1491-09FLN
######
YYWW
1
14
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.
3. “LN” designates Pb (lead) free.
7
MDS 1491-09 G
Integrated Circuit Systems, Inc.
●
525 Race Street, San Jose, CA 95126
Revision 080204
●
tel (408) 297-1201
●
www.icst.com
MK1491-09
AMD Geode™ GX2 Clock Source
Package Outline and Package Dimensions (28-pin SSOP, 209 mil Body)
Package dimensions are kept current with JEDEC Publication No. 95, MO-150
28
Millimeters
Symbol
E1
INDEX
AREA
Min
A
A1
A2
b
c
D
E
E1
e
L
α
E
1 2
D
Max
Min
—
2.00
0.05
—
1.65
1.85
0.22
0.38
0.09
0.25
9.90
10.50
7.40
8.20
5.00
5.60
0.65 Basic
0.55
0.95
0°
8°
Max
—
0.079
0.002
—
0.065
0.073
0.009
0.015
0.0035 0.010
0.390
0.413
0.291
0.323
0.197
0.220
0.0256 Basic
0.022
0.037
0°
8°
The controlling dimensions is inches
A
A2
Inches
A1
c
- Ce
SEATING
PLANE
b
L
Ordering Information
Part / Order Number
Marking
(see note 1)
Low EMI
Shipping Packaging
Feature
Package
Temperature
MK1491-09F
MK1491-09F
Yes
Tubes
28-pin SSOP
0 to +70°C
MK1491-09FTR
MK1491-09F
Yes
Tape and Reel
28-pin SSOP
0 to +70°C
MK1491-09FLN
MK1491-09FLN
Yes
Tubes
28-pin SSOP
0 to +70°C
MK1491-09FLNTR
MK1491-09FLN
Yes
Tape and Reel
28-pin SSOP
0 to +70°C
Note:
1. “L” designates Pb (lead) free.
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.
8
MDS 1491-09 G
Integrated Circuit Systems, Inc.
●
525 Race Street, San Jose, CA 95126
Revision 080204
●
tel (408) 297-1201
●
www.icst.com