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參數(shù)資料
| 型號： | CY2282-1 |
| 廠商： | Cypress Semiconductor Corp. |
| 英文描述： | 100-MHz PentiumII Clock Synthesizer/Driver with Spread Spectrum and USB for Desktop PCs(應用于桌上型PC機并帶有擴展頻譜和USB的100MHz奔騰II時鐘合成器/驅動器) |
| 中文描述： | 100兆赫PentiumII時鐘合成器/驅動器，帶有擴頻和USB的臺式機（應用于桌上型電腦機并帶有擴展頻譜和100MHz的奔騰的USB的第二時鐘合成器/驅動器） |
| 文件頁數(shù)： | 1/7頁 |
| 文件大小： | 112K |
| 代理商： | CY2282-1 |
PRELIMINARY
100-MHz Pentium
II Clock Synthesizer/Driver with
Spread Spectrum and USB for Desktop PCs
CY2282-1
CY2282-11S
Cypress Semiconductor Corporation
3901 North First Street
San Jose
CA 95134
408-943-2600
October 12, 1998
Features
Mixed 2.5V and 3.3V operation
Clock Generator for Pentium II, and other similar pro-
cessor-based motherboards
—Two 2.5V CPU clocks at 66.6 or 100 MHz
—Seven 3.3V synch. PCI clocks, one free-running
—Two 3.3V 48 MHz USB clocks
—One 3.3V REF clock at 14.318 MHz
—One 2.5V APIC clock at 14.318 MHz or PCI/2
Spread spectrum clocking for EMI control (CY2282-11S
only)
Factory-EPROM programmable output drive and slew
rate for EMI optimization
Low skew outputs,
≤
175 ps between CPU clocks
Available in space-saving 28-pin SOIC package
Functional Description
The CY2282 is a clock synthesizer/driver for a Pentium II, or
other similar processor-based PC requiring 100-MHz support.
The CY2282-1 outputs two CPU clocks at 2.5V. There are sev-
en PCI clocks, running at one-half or one-third the CPU clock
frequency of 66.6 MHz and 100 MHz respectively. One of the
PCI clocks is free-running. Additionally, the part outputs two
3.3V USB clocks at 48 MHz, one 3.3V reference clock at
14.318 MHz, and one 2.5V APIC clock at 14.318 MHz.
The CY2282-11S provides the same outputs as the CY2282-1
but also incorporates the Intel-defined spread spectrum fea-
tures. It provides a 0.5% downspread on the CPU and PCI
clocks, which can improve EMI in certain high-speed systems.
A summary of clock outputs for both devices is shown below.
The CY2282 outputs are designed for low EMI emissions.
Controlled rise and fall times, unique output driver circuits, and
factory-EPROM programmable output drive and slew-rate en-
able optimal configurations for EMI control.
CY2282 Selector Guide
Note:
1.
One free-running PCI clock.
Clock Outputs
CPU (66.6, 100 MHz)
PCI (CPU/2, CPU/3 MHz)
USB (48 MHz)
APIC (14.318 MHz)
REF (14.318 MHz)
CPU-PCI delay
Spread Spectrum
CY2282-1
2
7
[1]
2
1
1
1.5–4.0 ns
None
CY2282-11S
2
7
[1]
2
1
1
1.5–4.0 ns
–0.5%
Intel and Pentium are registered trademarks of Intel Corporation.
PinConfiguration
SOIC
Top View
Logic Block Diagram
1
2
3
4
5
6
7
8
9
10
11
12
13
14
16
15
19
18
17
28
27
26
25
24
23
20
21
22
C
XTALIN
XTALOUT
PCICLK_F
V
SS
PCICLK1
PCICLK2
PCICLK3
PCICLK4
V
DDPCI
PCICLK5
PCICLK6
V
DDUSB
USBCLK1
V
SS
REF
V
DDREF
V
DDAPIC
APIC
V
DDCPU
CPUCLK0
CPUCLK1
AV
DD
V
SS
NC
NC
SEL100
V
SS
USBCLK0
EPROM
XTALOUT
XTALIN
APIC
14.318
MHz
OSC.
V
DDAPIC
REF
CPU
PLL
SEL100
Delay
CPUCLK [0-1]
V
DDCPU
PCICLK_F
PCI [1-6]
STOP
LOGIC
STOP
LOGIC
USBCLK [0:1]
SYS PLL
Divider
V
DDPCI
V
DDPCI
V
DDREF
V
DDUSB
相關PDF資料 |
PDF描述 |
|---|---|
| CY2282-11S | 100-MHz PentiumII Clock Synthesizer/Driver with Spread Spectrum and USB for Desktop PCs(應用于桌上型PC機并帶有擴展頻譜和USB的100MHz奔騰II時鐘合成器/驅動器) |
| CY2283 | PentiumII, K6, 6x86 100-MHz Clock Synthesizer/Driver for Desktop PCs with ALI or VIA Chipsets, AGP and 3 DIMMs(帶ALI或VIA芯片組，AGP和3DIMM應用于桌上型PC機的奔II，K6, 6x86 100MHz時鐘合成器/驅動器) |
| CY2285 | 100-MHz PentiumII Clock Synthesizer/Driver with Spread Spectrum for Mobile PCs(應用于移動PC機并帶有寬頻譜的100MHz奔騰II時鐘合成器/驅動器) |
| CY2292FIT | Three-PLL General-Purpose EPROM Programmable Clock Generator |
| CY2292 | Three-PLL General-Purpose EPROM Programmable Clock Generator |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| CY2283 | 制造商:CYPRESS 制造商全稱:Cypress Semiconductor 功能描述:PentiumII, K6, 6x86 100-MHz Clock Synthesizer/Driver for Desktop PCs with ALI or VIA Chipsets, AGP and 3 DIMMs |
| CY2283PVC-1 | 制造商:CYPRESS 制造商全稱:Cypress Semiconductor 功能描述:PentiumII, K6, 6x86 100-MHz Clock Synthesizer/Driver for Desktop PCs with ALI or VIA Chipsets, AGP and 3 DIMMs |
| CY2283PVC-2 | 制造商:CYPRESS 制造商全稱:Cypress Semiconductor 功能描述:PentiumII, K6, 6x86 100-MHz Clock Synthesizer/Driver for Desktop PCs with ALI or VIA Chipsets, AGP and 3 DIMMs |
| CY2285 | 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-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 |
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