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參數(shù)資料
| 型號： | CY2285 |
| 廠商： | Cypress Semiconductor Corp. |
| 英文描述： | 100-MHz PentiumII Clock Synthesizer/Driver with Spread Spectrum for Mobile PCs(應(yīng)用于移動PC機(jī)并帶有寬頻譜的100MHz奔騰II時鐘合成器/驅(qū)動器) |
| 中文描述： | 100兆赫PentiumII時鐘合成器/驅(qū)動器，帶有擴(kuò)頻移動PC（應(yīng)用于移動電腦機(jī)并帶有寬頻譜的100MHz的奔騰二時鐘合成器/驅(qū)動器） |
| 文件頁數(shù)： | 1/9頁 |
| 文件大?。?/td> | 120K |
| 代理商： | CY2285 |
100-MHz Pentium
II Clock Synthesizer/Driver
with Spread Spectrum for Mobile PCs
The CY2285 possesses power-down, CPU stop, and PCI stop
pins for power management control. The signals are synchro-
nized on-chip, and ensure glitch-free transitions on the out-
puts. When the CPU_STOP input is asserted, the CPU clock
outputs are driven LOW. When the PCI_STOP input is assert-
ed, the PCI clock outputs (except the free-running PCI clock)
are driven LOW. When the PWR_DWN pin is asserted, the
reference oscillator and PLLs are shut down, and all outputs
are driven LOW.
The CY2285-2 features an early PCI clock which leads the
other PCI clocks by 1–4 ns. The CY2285-2 also features a
DIV4 pin which allows for dynamic shifting of CPU and PCI
clocks from the default frequency to the default/4.
CY2285 Selector Guide
CY2285
Cypress Semiconductor Corporation
3901 North First Street
San Jose
CA 95134
408-943-2600
June 30, 1999
Features
Mixed 2.5V and 3.3V operation
Complete clock solution for Pentium II, and other sim-
ilar processor-based motherboards
—Two CPU clocks at 2.5V up to 100 MHz
—Six synchronous PCI clocks, one free-running
—Two 3.3V Reference clocks at 14.318 MHz
—One 3.3V USB clock running at 48 MHz
—One 3.3V USB/IO clock running at 48 MHz/24 MHz
Spread Spectrum clocking for EMI control
1.5–4.0 ns delay between CPU and PCI clocks
Power-down, CPU stop and PCI stop pins
Low skew outputs,
≤
175 ps between CPU clocks
Early PCI clock leads PCI by 1–4 ns (-2 option)
DIV4 allows dynamic shifting of CPU and PCI clocks
from the default frequency to default/4 (-2 option)
Factory-EPROM programmable output drive and slew
rate for EMI customization
Available in space-saving 28-pin SSOP package
Functional Description
The CY2285 is a clock synthesizer/driver for Pentium II, or
other similar processor-based mobile PCs requiring up to
100-MHz support. The CY2285 outputs two CPU clocks at
2.5V. There are six PCI clocks, running at one-half or one-third
the CPU clock frequency of 66.6 MHz and 100 MHz respec-
tively. One of the PCI clocks is free-running. Additionally, the
part outputs two 3.3V reference clocks at 14.318 MHz.
The CY2285 provides incorporates the Intel-defined spread
spectrum features. It provides a –0.6% downspread on the
CPU and PCI clocks, which can help reduce EMI in certain
high-speed systems.
Notes:
1.
2.
One free-running PCI clock.
One early PCI clock.
Clock Outputs
CY2285-1
CY2285-2
CY2285-3
CPU (66, 100
MHz)
2
2
2
PCI (CPU/2,
CPU/3 MHz)
6
[1]
7
[1, 2]
6
[1]
Ref. (14.318
MHz)
2
2
1
USB (48 MHz)
1
1
1
USB/IO (48
MHz/24 MHz se-
lectable)
1
N/A
1
CPU-PCI delay
1.5–4.0 ns
1.5–4.0 ns
1.5–4.0 ns
EPCI-PCI delay
N/A
1.0–4.0 ns
N/A
Spread Spectrum
–0.6%
Downspread
–0.6%
Downspread
–0.6%
Downspread
Intel and Pentium are registered trademarks of Intel Corporation.
Logic Block Diagram
EPROM
XTALOUT
XTALIN
1MHz
OSC.
CPU
PLL
Delay
REF1/SEL48
REF1 (-2,-3 option)
CPUCLK [0–1]
V
DDCPU
EPCICLK (-2 option)
PCICLK [1-5]
STOP
STOP
LOGIC
CPU_STOP
DIV4
Divider
PCI_STOP
V
DDPCI
PCICLK_F
V
DDPCI
V
DDREF
REF0/SPREAD
REF0 (-2 option)
SYS
PLL
USBCLK
V
DD48
USB_IOCLK/TS (-1 option)
USBCLK/SEL100/66 (-2 option)
V
DD48
V
DDPCI
PWR_DWN
/4
SPREAD (-2,-3 option)
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| CY2292FIT | Three-PLL General-Purpose EPROM Programmable Clock Generator |
| CY2292 | Three-PLL General-Purpose EPROM Programmable Clock Generator |
| CY2292F | Three-PLL General-Purpose EPROM Programmable Clock Generator |
| CY2292FI | Three-PLL General-Purpose EPROM Programmable Clock Generator |
| CY2292SL-XXX | Three-PLL General-Purpose EPROM Programmable Clock Generator |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| CY2285PVC-1 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:CPU System Clock Generator |
| CY2285PVC-2 | 制造商:CYPRESS 制造商全稱:Cypress Semiconductor 功能描述:100-MHz Pentium㈢II Clock Synthesizer/Driver with Spread Spectrum for Mobile PCs |
| CY2285PVC-3 | 制造商:CYPRESS 制造商全稱:Cypress Semiconductor 功能描述:100-MHz Pentium㈢II Clock Synthesizer/Driver with Spread Spectrum for Mobile PCs |
| CY2287 | 制造商:CYPRESS 制造商全稱:Cypress Semiconductor 功能描述:100-MHz Spread Spectrum Clock Synthesizer/Driver with USB, Hublink, and SDRAM Support |
| CY2287-1 | 制造商:CYPRESS 制造商全稱:Cypress Semiconductor 功能描述:100-MHz Spread Spectrum Clock Synthesizer/Driver with USB, Hublink, and SDRAM Support |
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