- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄363888 > W48S87-72 (Cypress Semiconductor Corp.) Desktop/Notebook Frequency Generator(桌上型電腦/筆記本電腦系統(tǒng)頻率發(fā)生器) PDF資料下載
參數(shù)資料
| 型號(hào)： | W48S87-72 |
| 廠商： | Cypress Semiconductor Corp. |
| 英文描述： | Desktop/Notebook Frequency Generator(桌上型電腦/筆記本電腦系統(tǒng)頻率發(fā)生器) |
| 中文描述： | 臺(tái)式機(jī)/筆記本頻率發(fā)生器（桌上型電腦/筆記本電腦系統(tǒng)頻率發(fā)生器） |
| 文件頁數(shù)： | 1/19頁 |
| 文件大?。?/td> | 202K |
| 代理商： | W48S87-72 |
PRELIMINARY
Desktop/Notebook Frequency Generator
W48S87-72
Cypress Semiconductor Corporation
3901 North First Street
San Jose
CA 95134
408-943-2600
October 19, 1999, rev. **
Features
Maximized EMI suppression using Cypress’s Spread
Spectrum technology
± 0.5% Spread Spectrum clocking
Equivalent to the W48S67-72 with Spread Spectrum for
Tilamook, MMO, and Deschutes processors
Generates system clocks for CPU, IOAPIC, SDRAM,
PCI, USB plus 14.318-MHz (REF0:1)
Serial data interface (SDATA, SCLOCK inputs) provides
additional CPU/PCI clock frequency selections, individ-
ual output clock disabling and other functions
MODE input pin selects optional power management
input control pins (reconfigures pins 26 and 27)
Two fixed outputs separately selectable as 24-MHz or
48-MHz (default = 48-MHz)
V
DDQ3
= 3.3V±5%, V
DDQ2
= 2.5V±5%
Uses external 14.318-MHz crystal
Available in 48-pin SSOP (300 mils)
10
CPU output impedance
Table 1. Pin Selectable Frequency
[1]
CPU, SDRAM
Clocks (MHz)
Note:
1.
Additional frequency selections provided by serial data interface; refer to
Table 5
on page 8.
60/66_SEL
PCI Clocks
(MHz)
0
60
30
1
66.8
33.4
Block Diagram
Pin Configuration
VDDQ3
REF0
VDDQ2
IOAPIC
VDDQ2
CPU0
CPU1
CPU2
CPU3
SDRAM0
SDRAM1
SDRAM2
SDRAM3
SDRAM4
SDRAM5
SDRAM6
SDRAM7
PCI_F
PCI0
XTAL
OSC
PLL Ref Freq
PLL 1
60/66_SEL
MODE
X2
X1
REF1
VDDQ3
Stop
Output
Control
Stop
Output
Control
PCI1
PWR_DWN#
Power
Down
Control
PCI2
PCI3
PCI4
PCI5
48/24MHZ
48/24MHZ
PLL2
÷2
I/O
Control
CPU_STOP#
REF1
REF0
GND
X1
X2
MODE
VDDQ3
PCI_F
PCI0
GND
PCI1
PCI2
PCI3
PCI4
VDDQ3
PCI5
GND
60/66_SEL
SDATA
SCLOCK
VDDQ3
48/24MHZ
48/24MHZ
GND
W
VDDQ3
CPU2.5#
VDDQ2
IOAPIC
PWR_DWN#
GND
CPU0
CPU1
VDDQ2
CPU2
CPU3
GND
SDRAM0
SDRAM1
VDDQ3
SDRAM2
SDRAM3
GND
SDRAM4
SDRAM5
VDDQ3
SDRAM6/CPU_STOP#
SDRAM7/PCI_STOP#
VDDQ3
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| W49F002 | 256K X 8 CMOS FLASH MEMORY |
| W49F002U-12B | MB 32C 32#20 SKT RECP |
| W49F002U-70B | 256K X 8 CMOS FLASH MEMORY |
| W49F002U-90B | 256K X 8 CMOS FLASH MEMORY |
| W49F002UT12B | 256K X 8 CMOS FLASH MEMORY |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| W48S87-72H | 制造商:Cypress Semiconductor 功能描述:Logic and Timing, Clock Generation, Desktop/Notebook Frequency Generator |
| W48S87-72XT | 制造商:Rochester Electronics LLC 功能描述:- Tape and Reel |
| W49 | 制造商:CERAMATE 制造商全稱:CERAMATE 功能描述:3-Phase Motor Driver for CD-ROMs |
| W490 | 制造商:Pulse Electronics Corporation 功能描述:- Bulk |
| W49180 | 制造商:SEOUL 制造商全稱:Seoul Semiconductor 功能描述:Super high flux output and high luminance |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。