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MK1491-09F 반도체 회로 부품 판매점

AMD Geode GX2 Clock Source



Integrated Circuit Systems 로고
Integrated Circuit Systems
MK1491-09F 데이터시트, 핀배열, 회로
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


MK1491-09F 데이터시트, 핀배열, 회로
MK1491-09
AMD Geode™ GX2 Clock Source
Pin Assignment
GND
XI
XO
VDD
LCLK0/33M
LCLK1/33M
GND
VDD
LCLK2/33M
Sel66/33#
GND
VDD
48M
48M/TS#
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28 VDD
27 RefCLK0/Spread#
26 RefCLK1
25 VDD
24 PCICLK3/33-66M
23 PCICLK2/33-66M
22 GND
21 GND
20 PCICLK1/33-66M
19 VDD
18 PCICLK0/33-66M
17 PD#
16 66M
15 GND
PCI Frequency Select Table
Sel66/33#
0
1
PCI Frequency
33 MHz
66 MHz
EMI Control
Spread#
0
1
PCI Low EMI
ON
OFF
Spread direction is DOWN.
Pin Descriptions
Pin
Number
1, 7, 11, 15, 21, 22
2
3
4, 8, 12, 19, 25, 28
5, 6, 9
10
13
14
16
17
18, 20, 23, 24
26
27
Pin
Name
GND
XI
XO
VDD
LCLK
Sel66/33#
48M
48M/TS#
66M
PD#
PCICLK
RefCLK1
RefCLK0/
Spread#
Pin
Type
Pin Description
P Connect to Ground.
I Crystal connection. Connect to a 14.31818 MHz crystal or input clock.
O Crystal connection. Connect to a 14.31818 MHz crystal, or leave
unconnected.
P Connect to 3.3 V.
O 33 MHz low skew clock outputs.
I Selects frequency on PCICLK.
O 48 MHz clock output.
I/O 48 MHz clock output. TS# is high at power-up.
O 66 MHz clock output.
I Power-down input (see table on page 3).
O 33 to 66 MHz PCI synchronous clock outputs with low skew.
O Buffered reference output of 14.31818 MHz.
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.
MDS 1491-09 G
2
Revision 080204
Integrated Circuit Systems, Inc. 525 Race Street, San Jose, CA 95126 tel (408) 297-1201 www.icst.com




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