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參數(shù)資料
| 型號： | CY2272 |
| 廠商： | Cypress Semiconductor Corp. |
| 英文描述： | Pentium 6x86, K6 Clock Synthesizer/Driver for Mobile PCs with Intel 82430TX or Ali IV/V+ and 3 SO-DIMMs(帶英特爾82430TX或 Ali IV/V+ 和3個 SO-DIMM的應(yīng)用于移動PC機的奔騰6x86, K6 時鐘合成器/驅(qū)動器) |
| 中文描述： | 奔騰6x86，K6時鐘合成器/與英特爾82430TX或阿里四便攜式電腦驅(qū)動器/ V和3 SO - DIMM內(nèi)存（帶英特爾82430TX或阿里四音頻/視頻和3個SO - DIMM插槽的應(yīng)用于移動電腦機的奔騰6x86，K6時鐘合成器/驅(qū)動器） |
| 文件頁數(shù)： | 1/12頁 |
| 文件大?。?/td> | 206K |
| 代理商： | CY2272 |
Pentium, 6x86, K6 Clock Synthesizer/Driver for Mobile
PCs with Intel 82430TX or Ali IV/V+ and 3 SO-DIMMs
the PCI clocks by 1–4 ns. Additionally, the part outputs six 3.3V
SDRAM clocks, one 3.3V USB clock at 48 MHz, one IO clock
at 24 MHz, and two high-drive 3.3V reference clocks at 14.318
MHz.
The part possesses dedicated power-down, CPU stop, and
PCI stop pins for power management control. When the
CPU_STOP input is asserted, the CPU clock outputs are driv-
en LOW. When the PCI_STOP input is asserted, 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 CY2272 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.
CY2272 Selector Guide
CY2272
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
Complete clock solution for Pentium, Cyrix, and AMD
processor-based motherboards
—Four CPU clocks at 2.5V or 3.3V with three dedicated
CPU frequency select inputs
—Six 3.3V SDRAM clocks, support three portable
DIMMs
—Seven synchronous PCI clocks, one free-running,
one early
—One 3.3V 48 MHz USB clock
—One 3.3V 24 MHz IO clock
—Two high drive 3.3V Ref. clocks at 14.318 MHz
1 ns–4 ns delay between CPU and PCI clocks
I
2
C Serial Configuration Interface
Factory-EPROM programmable output drive and slew
rate for EMI customization
Factory-EPROM programmable CPU clock frequencies
for custom configurations
Dedicated Power-down, CPU stop and PCI stop pins
Available in space-saving 48-pin SSOP package
Functional Description
The CY2272 is a clock synthesizer/driver for a Pentium, Cyrix
6x86, or AMD K6 processor-based mobile PC using Intel’s
82430TX, Aladdin IV+ or other similar chipsets.
The CY2272-1 outputs four CPU clocks at 2.5V or 3.3V. There
are seven PCI clocks, running at one half the CPU clock fre-
quency. One of the PCI clocks is free-running. Another leads
Note:
1.
a
One free-running PCI clock, one early PCI clock.
Clock Outputs
-1
4
6
7
[1]
1
1
2
CPU (13.75, 15, 16.6, 18.75, 55, 60, 66.6, 75 MHz)
SDRAM
PCI (CPU/2MHz)
USB (48MHz)
IO (24MHz)
Ref (14.318MHz)
CPU-PCI delay
1–4 ns
Intel and Pentium are registered trademarks of Intel Corporation.
I
2
C is a trademark of Philips Corporation.
Pin Configuration
SSOP
Top View
Logic Block Diagram
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
33
32
31
30
29
28
25
26
27
36
35
34
AV
DD
REF0
V
SS
XTALIN
XTALOUT
REF1
45
44
43
42
41
40
37
38
39
48
47
46
C
V
DDQ3
PCICLK_F
PCICLK0
PCICLK1
PCICLK2
PCICLK3
V
DDQ3
V
SS
PCICLK4
EPCICLK
V
SS
V
DDQ3
PWR_DWN
SEL1
V
SS
SDATA
SCLK
V
DDQ3
USBCLK
IOCLK
V
SS
CPUCLK0
CPUCLK1
V
DDCPU
CPUCLK2
CPUCLK3
V
SS
SDRAM0
SDRAM1
V
DDQ3
SDRAM2
SDRAM3
V
SS
SDRAM4
SDRAM5
CPU_STOP
PCI_STOP
V
SEL0
SEL2
V
DDQ3
V
SS
EPROM
XTALOUT
XTALIN
14.318
MHz
OSC.
SDRAM [0-5]
SEL0
SEL1
SEL2
CPU
PLL
SCLK
SDATA
REF [0-1] (14.318 MHz)
CPUCLK [0-3]
V
DDCPU
PCICLK [0-5]
PCICLK_F
STOP
LOGIC
STOP
LOGIC
INTERFACE
CONTROL
LOGIC
SERIAL
USBCLK
SYS PLL
EPCICLK
CPU_STOP
PWR_DWN
PCI_STOP
IOCLK
/2
Delay
/2 or /2.5
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| CY2275A | PentiumII Clock Synthesizer/Driver for Desktop PCs with Intel 82440LX with 3 DIMMs(帶英特爾82440LX 和 3個DIMM的應(yīng)用于桌上型PC機的奔騰II時鐘合成器/驅(qū)動器) |
| CY2276A-12 | PentiumII Clock Synthesizer/Driver for Desktop PCs with Intel 82440LX and 4 DIMMs(帶英特爾82440LX 和4個DIMM的應(yīng)用于桌上型PC機的奔騰II時鐘合成器/驅(qū)動器) |
| CY2276A-13 | PentiumII Clock Synthesizer/Driver for Desktop PCs with Intel 82440LX and 4 DIMMs(帶英特爾82440LX 和4個DIMM的應(yīng)用于桌上型PC機的奔騰II時鐘合成器/驅(qū)動器) |
| CY2276A-21 | PentiumII Clock Synthesizer/Driver for Desktop PCs with Intel 82440LX and 3SO- DIMMs(帶英特爾82440LX 和3SO-DIMM的應(yīng)用于桌上型PC機的奔騰II時鐘合成器/驅(qū)動器) |
| CY2276A-31 | PentiumII Clock Synthesizer/Driver for Desktop PCs with Intel 82440LX and 3SO- DIMMs(帶英特爾82440LX 和3SO-DIMM的應(yīng)用于桌上型PC機的奔騰II時鐘合成器/驅(qū)動器) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| CY2273A | 制造商:CYPRESS 制造商全稱:Cypress Semiconductor 功能描述:Pentium㈢/II, 6x86, K6 Clock Synthesizer/Driver for Desktop PCs with Intel 82430TX, 82440LX or ALI IV/IV+, AGP and 3 DIMMs |
| CY2273A-1 | 制造商:CYPRESS 制造商全稱:Cypress Semiconductor 功能描述:Pentium㈢/II, 6x86, K6 Clock Synthesizer/Driver for Desktop PCs with Intel 82430TX, 82440LX or ALI IV/IV+, AGP and 3 DIMMs |
| CY2273A-2 | 制造商:CYPRESS 制造商全稱:Cypress Semiconductor 功能描述:Pentium㈢/II, 6x86, K6 Clock Synthesizer/Driver for Desktop PCs with Intel 82430TX, 82440LX or ALI IV/IV+, AGP and 3 DIMMs |
| CY2273A-3 | 制造商:CYPRESS 制造商全稱:Cypress Semiconductor 功能描述:Pentium㈢/II, 6x86, K6 Clock Synthesizer/Driver for Desktop PCs with Intel 82430TX, 82440LX or ALI IV/IV+, AGP and 3 DIMMs |
| CY2273A-4 | 制造商:CYPRESS 制造商全稱:Cypress Semiconductor 功能描述:Pentium㈢/II, 6x86, K6 Clock Synthesizer/Driver for Desktop PCs with Intel 82430TX, 82440LX or ALI IV/IV+, AGP and 3 DIMMs |
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