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参数资料
| 型号： | ICS9147F-PPP-LF |
| 厂商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分类： | 时钟产生/分配 |
| 英文描述： | 83.3 MHz, PROC SPECIFIC CLOCK GENERATOR, PDSO48 |
| 封装： | 0.300 INCH, SSOP-48 |
| 文件页数： | 4/7页 |
| 文件大小： | 253K |
| 代理商： | ICS9147F-PPP-LF |
4
ICS9147-22
Technical Pin Function Descriptions
VDD(1,2,3,4)
This is the power supply to the internal core logic of the
device as well as the clock output buffers for REF(0:1),
PCICLK,48/24MHzandSDRAM(0:7).
This supply operates at 3.3 volts. Clocks from the listed
buffers that it supplies will have a voltage swing from Ground
to this level. For the actual guaranteed high and low voltage
levels for the Clocks, please consult the DC parameter table
in this data sheet.
VDDL
This is the power supply for the CPUCLK and IOAPIC output
buffers. The voltage level for these outputs may be 2.5 or 3.3
volts. Clocks from the buffers that each supplies will have a
voltage swing from Ground to this level. For the actual
guaranteed high and low voltage levels of these Clocks,
please consult the DC parameter table in this Data Sheet.
GND
This is the power supply ground (common or negative)
return pin for the internal core logic and all the output
buffers.
X1
This input pin serves one of two functions. When the
device is used with a Crystal, X1 acts as the input pin for
the reference signal that comes from the discrete crystal.
When the device is driven by an external clock signal, X1
is the device input pin for that reference clock. This pin
also implements an internal Crystal loading capacitor that
is connected to ground. See the data tables for the value
of this capacitor. Also includes feedback resistor from X2.
X2
This Output pin is used only when the device uses a
Crystal as the reference frequency source. In this mode of
operation, X2 is an output signal that drives (or excites)
the discrete Crystal. The X2 pin will also implement an
internal Crystal loading capacitor that is connected to
ground. See the Data Sheet for the value of this capacitor.
CPUCLK (0:3)
These Output pins are the Clock Outputs that drive
processor and other CPU related circuitry that requires
clocks which are in tight skew tolerance with the CPU
clock. The voltage swing of these Clocks is controlled by the
Voltage level applied to theVDDL2 pin of the device. See the
Functionality Table for a list of the specific frequencies that
are available for these Clocks and the selection codes to
produce them.
SDRAM(0:7)
These Output Clocks are use to drive Dynamic RAMs and
are low skew copies of the CPU Clocks. The voltage swing of
the SDRAMs output is controlled by the supply voltage
that is applied to VDD3 of the device, operating at 3.3 volts.
48MHz
This is a fixed frequency Clock output at 48MHz that is
typically used to drive USB devices.
24MHz
This pin is a fixed frequency clock output typically used
to drive Super I/O devices.
IOAPIC
This Output is a fixed frequency Output Clock that runs at
the Reference Input (typically 14.31818MHz) . Its voltage
level swing is controlled by VDDL and may operate at 2.5
or 3.3volts.
REF(0:1)
The REF Outputs are fixed frequency Clocks that run at
the same frequency as the Input Reference Clock X1 or the
Crystal (typically 14.31818MHz) attached across X1 and
X2.
PCICLK_F
This Output is equivalent to PCICLK(0:5) and is FREE
RUNNING.
PCICLK (0:5)
These Output Clocks generate all the PCI timing
requirements for a Pentium/Pro based system. They
conform to the current PCI specification. They run at 1/2
CPU frequency, or CPU/2.5; see frequency table.
FS0,1,2
These Input pins control the frequency of the Clocks at the
CPU, PCICLK and SDRAM output pins. See frequency
table.
PD#
This input pin stops all clocks in the low state and powers
down the oscillator and VCOs.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ICS9148-02 | 制造商:ICS 制造商全称:ICS 功能描述:Pentium/ProTM System Clock Chip |
| ICS9148-03 | 制造商:ICS 制造商全称:ICS 功能描述:Frequency Generator & Integrated Buffers for PENTIUM/ProTM |
| ICS9148-08 | 制造商:IDT 制造商全称:Integrated Device Technology 功能描述:Frequency Generator & Integrated Buffers for PENTIUM/ProTM |
| ICS9148-08-PPP | 制造商:ICS 制造商全称:ICS 功能描述:Frequency Generator & Integrated Buffers for PENTIUM/Pro |
| ICS9148-10 | 制造商:ICS 制造商全称:ICS 功能描述:Pentium/ProTM System Clock Chip |
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