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參數(shù)資料
| 型號(hào)： | MK2014ATR |
| 元件分類： | 時(shí)鐘產(chǎn)生/分配 |
| 英文描述： | 25 MHz, OTHER CLOCK GENERATOR, PDSO8 |
| 封裝： | SOIC-8 |
| 文件頁(yè)數(shù)： | 2/4頁(yè) |
| 文件大?。?/td> | 44K |
| 代理商： | MK2014ATR |
MK2014A
Fast Ethernet Clock Source
MDS 2014A B
2
Revision 121598
Printed 11/15/00
MicroClock Division of ICS 525 Race Street San Jose CA 95126(408)295-9800tel(408)295-9818fax
I C R O
C LOC K
Number
Name
Type
Description
1
X1/ICLK
XI
Crystal Connection. Connect to a 14.31818 MHz crystal or clock.
2
VDD
P
Connect to +5V.
3
GND
P
Connect to ground.
4
25M
O
25.000 MHz clock output.
5
GND
P
Connect to ground.
6
20M
O
20.000 MHz clock output.
7
14M
O
14.31818 MHz buffered crystal clock output.
8
X2
XO
Crystal Connection to a 14.31818 MHz crystal, or leave unconnected for clock input.
Pin Descriptions
Key: I = Input, O = output, P = power supply connection
Pin Assignment
14.3 MHz in
(crystal caps not
shown)
Pin 1
2
3
5
6
7
0.1F
25MHz out
G
V
33
(optional)
Suggested Layout
4
8
External Components/Crystal Selection
A minimum number of external components are required for proper oscillation. A decoupling capacitor of
0.1 F should be connected between VDD and GND on pins 2 and 3, and 33
terminating resistors
should be used on clock outputs with traces longer than 1 inch. For a clock input, connect to X1 and leave
X2 unconnected. For a crystal input, a parallel resonant 14.31818 MHz crystal is recommended. The
frequency accuracy of the crystal should be 30 ppm or better. External capacitors from each of the X1 and
X2 pins to ground should be added with a value in pF equal to (CL-13)*2, where CL is the crystal load
capacitance in pF. So for a crystal with load capacitance of 16 pF, 6 pF capacitors should be used. [Note
that the MK2014S required crystal load capacitors of (CL-4)*2.]
33
(optional)
14.3MHz
out
1
8
2
3
4
7
6
5
X1/ICLK
14M
GND
X2
VDD
20M
GND
8 pin SOIC
25M
33
(optional)
20MHz
out
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