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參數資料
| 型號： | W48C55A |
| 廠商： | Cypress Semiconductor Corp. |
| 英文描述： | Frequency Synthesizers(頻率合成器) |
| 中文描述： | 頻率合成器（頻率合成器） |
| 文件頁數： | 2/8頁 |
| 文件大小： | 146K |
| 代理商： | W48C55A |
W48C54A/55A
2
Pin Definitions
Pin Name
1.843MHz
Pin
Type
O
Pin #
-05, -09
N/A
Pin #
-08
N/A
Pin #
-59
1
Pin #
-61
1
Pin Description
Fixed 1.843-MHz output for serial I/O clock application
12MHz
O
N/A
N/A
7
8
Fixed 12-MHz output for keyboard clock application
16MHz
O
N/A
N/A
N/A
6
Fixed 16-MHz output for APIC or bus clock application
REF
O
11
11
11
13, 14
Fixed Reference output.
24MHz
O
N/A
N/A
6
7
Fixed 24-MHz output for floppy drive or super I/O application
32MHz
O
7
7
N/A
N/A
Fixed 32-MHz output for ISA or PCI bus clock application
40MHz
O
6
N/A
N/A
N/A
Fixed 40-MHz output for SCSI clock application
47.059MHz
O
N/A
15
N/A
N/A
Fixed 47.059-MHz output
2XCPU
O
N/A
N/A
N/A
17
2X Clock Output (refer to Frequency Selection table)
CPU
O
15
N/A
14
18
Clock Output (refer to Frequency Selection table)
NC
10, 14
1, 6, 10,
14, 16
N/A
N/A
No Connect
OE
I
9
9
9
10
Output Enable, puts all outputs in high-impedance state
when LOW
PD
I
N/A
N/A
10
12
Power Down input, puts device in power-down mode when
LOW
FS0
I
1
N/A
15
20
Frequency Selection input, LSB
FS1
I
16
N/A
16
19
Frequency Selection input
FS2
I
N/A
N/A
N/A
11
Frequency Selection input
VDD
P
4, 13
4, 13
4, 13
4, 16
Power supply connection
GND
G
5, 8, 12
5, 8, 12
5, 8, 12
5, 9, 15
Ground connection
X1
I
3
3
3
3
Crystal connection or external clock frequency input
X2
O
2
2
2
2
Crystal connection, leave unconnected when driving X1 with
external clock
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| W48C54A | Frequency Synthesizers(頻率合成器) |
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