- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄67704 > ICS9148F-08 (INTEGRATED DEVICE TECHNOLOGY INC) 83.3 MHz, PROC SPECIFIC CLOCK GENERATOR, PDSO48 PDF資料下載
參數(shù)資料
| 型號： | ICS9148F-08 |
| 廠商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分類： | 時鐘產(chǎn)生/分配 |
| 英文描述： | 83.3 MHz, PROC SPECIFIC CLOCK GENERATOR, PDSO48 |
| 封裝： | 0.300 INCH, SSOP-48 |
| 文件頁數(shù)： | 1/14頁 |
| 文件大?。?/td> | 605K |
| 代理商： | ICS9148F-08 |
Integrated
Circuit
Systems, Inc.
General Description
Features
ICS9148-08
Block Diagram
Frequency Generator & Integrated Buffers for PENTIUM/ProTM
9148-08RevA092297P
Pin Configuration
3.3V outputs: SDRAM, PCI, REF, 48/24 MHz
2.5V or 3.3V outputs; CPU, IOAPIC
20 ohm CPU clock output impedance
20 ohm PCI clock output impedance
Skew from CPU (earlier) to PCI clock - 1 to 4 ns,
center 2.6 ns.
No external load cap for CL=18pF crystals
±250 ps CPU, PCI clock skew
400ps (cycle to cycle) CPU jitter
Smooth frequency switch , with selections from 50 to 83.3
MHz CPU.
I2C interface for programming
2ms power up clock stable time
Clock duty cycle 45-55%.
48 pin 300 mil SSOP package
3.3V operation, 5V tolerant input.
48-Pin SSOP
Power Groups
VDD1 = REF (0:1), X1, X2
VDD2 = PCICLK_F, PCICLK(0:5)
VDD3 = SDRAM (0:11), supply for PLL core,
24MHz, 48MHz
VDDL1 = IOAPIC
VDDL2 = CPUCLK (0:3)
* Internal Pull-up Resistor of
240K to 3.3V on indicated inputs
The ICS9148-08 generates all clocks required for high
speed RISC or CISC microprocessor systems such as Intel
PentiumPro or Cyrix. Eight different reference frequency
multiplying factors are externally selectable with smooth
frequency transitions.
Features include four CPU, seven PCI and Twelve SDRAM
clocks. Two reference outputs are available equal to the
crystal frequency. Plus the IOAPIC output powered by
VDDL1. One 48 MHz for USB, and one 24 MHz clock for
Super IO. Spread Spectrum built in ±1.5% modulation to
reduce the EMI. Serial programming I2C interface allows
changing functions, stop clock programing and Frequency
selection. Rise time adjustment for VDD at 3.3V or 2.5V CPU.
Additionally, the device meets the Pentium power-up
stabilization, which requires that CPU and PCI clocks be stable
within 2ms after power-up. It is not recommended to use I/O
dual function pin for the slots (ISA, PCI, CPU, DIMM). The
add on card might have a pull up or pull down.
High drive PCICLK and SDRAM outputs typically provide
greater than 1 V/ns slew rate into 30pF loads. CPUCLK
outputs typically provide better than 1V/ns slew rate into
20pF loads while maintaining 50±5% duty cycle. The REF
and 24 and 48 MHz clock outputs typically provide better
than 0.5V/ns slew rates.
Pentium is a trademark of Intel Corporation
I2C is a trademark of Philips Corporation
ICS reserves the right to make changes in the device data identified in this
publication without further notice. ICS advises its customers to obtain the latest
version of all device data to verify that any information being relied upon by the
customer is current and accurate.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ICS9148F-11 | 66.6 MHz, PROC SPECIFIC CLOCK GENERATOR, PDSO48 |
| ICS9148F-14LF | 66.6 MHz, PROC SPECIFIC CLOCK GENERATOR, PDSO48 |
| ICS9148F-14 | 66.6 MHz, PROC SPECIFIC CLOCK GENERATOR, PDSO48 |
| ICS9148F-14LF | 66.6 MHz, PROC SPECIFIC CLOCK GENERATOR, PDSO48 |
| ICS9148F-14 | 66.6 MHz, PROC SPECIFIC CLOCK GENERATOR, PDSO48 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ICS9148F-10 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:CPU System Clock Generator |
| ICS9148F-11 | 制造商:ICS 制造商全稱:ICS 功能描述:Frequency Generator & Integrated Buffers for PENTIUMTM |
| ICS9148F-12 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:CPU System Clock Generator |
| ICS9148F-13 | 制造商:ICS 制造商全稱:ICS 功能描述:Frequency Generator & Integrated Buffers for PENTIUMTM |
| ICS9148F-13T | 制造商:ICS 功能描述:9148F-13T |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。