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参数资料
| 型号： | MK1443-03S |
| 元件分类： | XO, clock |
| 英文描述： | 100 MHz, PROC SPECIFIC CLOCK GENERATOR, PDSO16 |
| 封装： | SKINNY, SOIC-16 |
| 文件页数： | 2/4页 |
| 文件大小： | 67K |
| 代理商： | MK1443-03S |
MK1442/MK1443
SCSI and Ethernet Clock Source
MDS 1442/3 E
2
Revision 111500
Printed 11/15/00
Integrated Circuit Systems, Inc. 525 Race Street San Jose CA 95126 (408)297-1201tel www.icst.com
Number
Name
Type
Description
1
CPUS1
TI
Select 1 for 2XCPU and CPU frequencies. See Table above, note 5 below.
2
X2
O
Crystal connection. Connect to 14.318 MHz crystal, or leave unconnected for clock input.
3
X1
I
Crystal connection. Connect to 14.318 MHz crystal, or drive with a 14.318MHz clock.
4
VDD
P
Connect to +5V or 3.3V. Must be same voltage as pin 13.
5
GND
P
Connect to ground.
6
24M
O
24.00 MHz floppy (or super I/O) clock output.
7
40M
O
40.00 MHz clock output
8
20M
O
20.000 MHz Ethernet clock output
9
KBOUT
O
Keyboard clock. 12.00 MHz on -01, 8.00 MHz on -02, 16.00 MHz on -03 version.
10
OE
I
Output Enable on 1442. Tri-states all clock outputs when this input is low. Internal pull-up.
11
14.3M
O
14.318 MHz system clock output.
12
GND
P
Connect to ground.
13
VDD
P
Connect to +5V or 3.3V. Must be same voltage as pin 4.
14
CPU
O
CPU output. See Table above. Rising edge is within 250ps of 2XCPU.
15
2XCPU
O
2XCPU output. See Table above. Rising edge is within 250ps of CPU.
16
CPUS0
TI
Select 0 for 2XCPU and CPU frequencies. See Table above, note 5 below.
Pin Descriptions
CPUS1 CPUS0 2XCPU (MHz)
CPU (MHz)
0
8.00
4.00
0
M
80.00
40.00
0
1
33.33
16.67
M
0
100.00 (note 4)
50.00 (note 4)
M
66.67
33.33
M
1
60.00
30.00
1
0
50.00
25.00
1
M
20.00
10.00
1
25.00
12.50
CPU Clock Decoding
Notes:
1. M = mid point (input is left floating. See note 5 below)
2. Actual frequencies are within 0.05% of those shown.
3. Transitions between mean frequencies are smooth, and do not
violate Intel’s 0.1% per cycle specification.
4. These selections are not guaranteed to operate at 3V
Key: I = Input, TI = three level input, O = output, P = power supply connection
Note 5: The TI inputs are internally held at mid-level, so they cannot drift high or low.
1
8
9
16
2
3
4
5
6
7
10
11
12
13
14
15
CPUS0
14.3M
CPU
2XCPU
VDD
GND
CPUS1
X2
40M
24M
VDD
GND
X1
20M
KBOUT
OE or 14.3M
(MK1442)
(MK1443)
Pin Assignment
Crystal and Capacitor Selection for Ethernet Accuracy
The MK1442/3 requires external crystals between the X1 and X2 pins and ground, as shown on the block
diagram on page 1. For an accurate Ethernet frequency of 20.000 MHz, a 14.31818 MHz ±50 ppm,
parallel resonant crystal with a load capacitance of 16pF is recommended, along with 22 pF ±5% (NPO
dielectric) chip capacitors. If the 20 MHz output is not used for Ethernet, any 22 pF capacitors will work.
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相关代理商/技术参数 |
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|---|---|
| MK1449B | 制造商:ICS 制造商全称:ICS 功能描述:Sound/SCSI+Fast Ethernet Clock |
| MK1449S | 制造商:ICS 制造商全称:ICS 功能描述:Sound/SCSI+Fast Ethernet Clock |
| MK1449SI | 制造商:ICS 制造商全称:ICS 功能描述:Sound/SCSI+Fast Ethernet Clock |
| MK1449SITR | 制造商:ICS 制造商全称:ICS 功能描述:Sound/SCSI+Fast Ethernet Clock |
| MK1449STR | 制造商:ICS 制造商全称:ICS 功能描述:Sound/SCSI+Fast Ethernet Clock |
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