MK1491-09F 查看數據表（PDF） - Integrated Circuit Systems
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MK1491-09F Datasheet PDF : 8 Pages
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MK1491-09
AMD Geode™ GX2 Clock Source
Pin Assignment
GND 1
XI 2
XO 3
VDD 4
LCLK0/33M 5
LCLK1/33M 6
GND 7
VDD 8
LCLK2/33M 9
Sel66/33# 10
GND 11
VDD 12
48M 13
48M/TS# 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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