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參數資料
| 型號： | W48C20 |
| 廠商： | Cypress Semiconductor Corp. |
| 英文描述： | Audio Subsystem Clock Generator(音頻子系統時鐘發生器) |
| 中文描述： | 音頻子系統時鐘發生器（音頻子系統時鐘發生器） |
| 文件頁數： | 1/4頁 |
| 文件大小： | 92K |
| 代理商： | W48C20 |
Audio Subsystem Clock Generator
W48C20
Cypress Semiconductor Corporation
3901 North First Street
San Jose
CA 95134
December 20, 1999, rev. **
408-943-2600
Features
Two independent phase-locked loops
Four independent output frequencies
±250 ps maximum cycle-to-cycle jitter
3 ns rise/fall time (20%-80% V
DD
).
Options available for a wide range of applications
Supports 3.3V and 5V operation
Low power CMOS design available in:
—8-pin SOIC (Small Outline Integrated Circuit)
Overview
The W48C20 is a general-purpose device that features two
phase-locked loops. Through the use of metal masks, the chip
can be tailored to a wide variety of applications.
The W48C20 has four clock outputs, each of which is
maskable to a different frequency. Because the chip offers four
outputs in eight pins, it is suited to applications that require
multiple frequencies and have space constraints.
Table 1. Product Selection Guide
Mask
Pin 4
Pin 5
Pin 6
Pin 7
Application
-01A
16.9344 24.576 33.8688 14.318 Audio/Crystal
-08
33.8688 18.432 16.9344
27.00
DVD
-09
40.00
22.50
20.00
25.00
Hard Disk
Drives
Pin Configuration
Functional Block Diagram
XTAL
OSC
OUTPUT
PLL 1
PLL 2
OUTPUT
OUTPUT
OUTPUT
XTAL
X1
X2
Crystal load capacitors
as needed
GND
VCC
X1
VCC
GND
OUTPUT
1
2
3
4
8
7
6
5
X2
OUTPUT
OUTPUT
OUTPUT
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