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参数资料
| 型号： | MK1442-02SLF |
| 元件分类： | 时钟产生/分配 |
| 英文描述： | 100 MHz, PROC SPECIFIC CLOCK GENERATOR, PDSO16 |
| 封装： | 0.150 INCH, SKINNY, SOIC-16 |
| 文件页数： | 2/4页 |
| 文件大小： | 63K |
| 代理商： | MK1442-02SLF |
MK1442/MK1443
SCSI and Ethernet Clock Source
MDS 1442/3 F
2
Revision 101001
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
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.
(MK1443)
(MK1442)
16 pin (150 mil) SOIC
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相关代理商/技术参数 |
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| MK1442-03S | 制造商:ICS 制造商全称:ICS 功能描述:SCSI and Ethernet Clock Source |
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| MK1443-02S | 制造商:ICS 制造商全称:ICS 功能描述:SCSI and Ethernet Clock Source |
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