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參數資料
| 型號： | W48S111 |
| 廠商： | Cypress Semiconductor Corp. |
| 英文描述： | Spread Spectrum Desktop/Notebook System Frequency Generator |
| 中文描述： | 擴頻桌面/筆記本電腦系統的頻率發生器 |
| 文件頁數： | 2/11頁 |
| 文件大小： | 137K |
| 代理商： | W48S111 |
W48S111-14
PRELIMINARYPRELIMI-
2
Pin Definitions
Pin Name
CPU0:1
Pin
No.
22, 21
Pin
Type
O
Pin Description
CPU Clock Outputs 0 through 1:
These two CPU clocks run at a frequency set by
SEL100/66#. Output voltage swing is set by the voltage applied to VDDQ2.
PCI Bus Clock Outputs 1 through 6 and PCI_F:
These seven PCI clock outputs
run synchronously to the CPU clock. Voltage swing is set by the power connection
to VDDQ3.
I/O APIC Clock Output:
Provides 14.318-MHz fixed frequency. The output voltage
swing is set by the power connection to VDDQ2.
48-MHz Output:
Fixed 48-MHz USB clock. Output voltage swing is controlled by
voltage applied to VDDQ3.
24-MHz or 48-MHz Output:
Frequency is set by the state of pin 27 on power-up.
PCI1:6
PCI_F
5, 6, 7, 8, 10,
11, 4
O
IOAPIC
24
O
48MHz
13
O
24/48MHz
14
O
REF2X/SEL48#
27
I/O
I/O Dual-Function REF2X and SEL48# pin:
Upon power-up, the state of SEL48#
is latched. The initial state is set by either a 10K resistor to GND or to V
DD
. A 10K
resistor to GND causes pin 14 to output 48 MHz. If the pin is strapped to V
DD
, pin
14 will output 24 MHz. After 2 ms, the pin becomes a high-drive output that produces
a copy of 14.318 MHz.
Frequency Selection Input:
Selects CPU clock frequency as shown in
Table 1
on
page 1.
I
2
C Data Pin:
Data should be presented to this input as described in the I
2
C section
of this data sheet. Internal 250-k
pull-up resistor.
I
2
C clock Pin:
The I
2
C data clock should be presented to this input as described in
the I
2
C section of this data sheet.
SEL100/66#
16
I
SDATA
18
I/O
SCLOCK
17
I
X1
1
I
Crystal Connection or External Reference Frequency Input:
Connect to either
a 14.318-MHz crystal or other reference signal.
X2
2
I
Crystal Connection:
An input connection for an external 14.318-MHz crystal. If
using an external reference, this pin must be left unconnected.
VDDQ3
9, 12, 20, 26
P
Power Connection:
Power supply for core logic and PLL circuitry, PCI, 48/24MHz,
and Reference output buffers. Connect to 3.3V supply.
Power Connection:
Power supply for IOAPIC and CPU output buffers. Connect to
2.5V supply.
Ground Connections:
Connect all ground pins to the common system ground
plane.
VDDQ2
23, 25
P
GND
3, 15, 19, 28
G
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相關代理商/技術參數 |
參數描述 |
|---|---|
| W48S111-14 | 制造商:CYPRESS 制造商全稱:Cypress Semiconductor 功能描述:Spread Spectrum Desktop/Notebook System Frequency Generator |
| W48S87 | 制造商:CYPRESS 制造商全稱:Cypress Semiconductor 功能描述:Desktop/Notebook Frequency Generator |
| W48S87-04 | 制造商:CYPRESS 制造商全稱:Cypress Semiconductor 功能描述:Spread Spectrum 3 DIMM Desktop Clock |
| W48S87-72 | 制造商:CYPRESS 制造商全稱:Cypress Semiconductor 功能描述:Desktop/Notebook Frequency Generator |
| W48S87-72H | 制造商:Cypress Semiconductor 功能描述:Logic and Timing, Clock Generation, Desktop/Notebook Frequency Generator |
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