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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： | 1/8頁 |
| 文件大小： | 146K |
| 代理商： | W48C55A |
Frequency Synthesizers
W48C54A/55A
Cypress Semiconductor Corporation
3901 North First Street
San Jose
CA 95134
September 28 1999, rev. **
408-943-2600
A
Features
Proprietary crystal oscillator circuitry provides low
REFOUT jitter, excellent duty cycle
Power-on delay feature ensures full V
DD
is reached prior
to output activation
3.3V and 5V operation supported including the VRE
(Voltage Regulated Extended) specification for
Pentium processor
Pin and function compatible with AV9154/AV9155
Integral PLL loop filter components ensures stable PLL
operation in noisy system environment
Smooth frequency transition of CPU and 2XCPU
outputs
Compatible with Intel X86 and other high-performance
processors
Up to eight outputs for CPU and peripherals
Supports Green PC and notebook designs
Custom options available with metal layer change
High-performance, low-power CMOS
Available in 16- (150-mil) and 20-pin SOIC package
(300-mil)
Intel and Pentium are registered trademarks of Intel Corporation.
Block Diagram
Pin Configurations
OSC
PLL2
PLL1
XTAL
X1
X2
14.318 MHz
Xtal
VDD
FS2:0
PD
GND
OE
14.318 MHz
Fixed
Outputs
2XCPU
CPU
NC
47.059MHz
NC
VDD
GND
REF(20MHz)
NC
OE
16
15
14
13
12
11
10
9
NC
X2
X1
VDD
GND
NC
32MHz
GND
1
2
3
4
5
6
7
8
W
FS1
CPU
NC
VDD
GND
REF(20MHz)
NC
OE
16
15
14
13
12
11
10
9
FS0
X2
X1
VDD
GND
40MHz
32MHz
GND
1
2
3
4
5
6
7
8
W
FS1
FS0
CPU
VDD
GND
14.318MHz
PD
OE
16
15
14
13
12
11
10
9
1.843MHz
X2
X1
VDD
GND
24MHz
12MHz
GND
1
2
3
4
5
6
7
8
W
FS0
FS1
CPUCLK
2XCPUCLK
VDD
GND
14.318MHz
14.318MHz
PD
FS2
20
19
18
17
16
15
14
13
12
11
1.843MHz
X2
X1
VDD
GND
16MHz
24MHz
12MHz
GND
0E
1
2
3
4
5
6
7
8
9
10
W
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