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參數(shù)資料
| 型號(hào)： | CY2267 |
| 廠商： | Cypress Semiconductor Corp. |
| 英文描述： | Pentium Pro, and Cyrix 6x86 Compatible Clock Synthesizer/Driver(奔騰和 Cyrix公司 6x86兼容的時(shí)鐘合成器/驅(qū)動(dòng)器) |
| 中文描述： | 奔騰Pro和Cyrix 6x86兼容的時(shí)鐘合成器/驅(qū)動(dòng)器（奔騰和Cyrix公司6x86兼容的時(shí)鐘合成器/驅(qū)動(dòng)器） |
| 文件頁(yè)數(shù)： | 1/9頁(yè) |
| 文件大?。?/td> | 104K |
| 代理商： | CY2267 |
Pentium
, Pentium
Pro, and Cyrix
6x86
Compatible Clock Synthesizer/Driver
Functional Description
CY2267
Cypress Semiconductor Corporation
3901 North First Street
San Jose
CA 95134
408-943-2600
September 1996 - Revised June 12, 1997
Features
Complete clock solution to meet requirements of Pen-
tium, Pentium Pro, or Cyrix 6x86 motherboards in-
cluding dual-processor and SDRAM designs
—Sixteen CPU clock outputs, up to 66.66 MHz (see
Function Table)
—One synchronous PCI clock output
—One USB clock at 48 MHz, meets Intel’s accuracy,
jitter, as well as rise and fall time requirements
—One I/O clock at 24 MHz
—One Ref. clock at 14.318 MHz
Two dedicated, independent Frequency Select inputs
(internal pull-up) ease system design, enable in-system
frequency changes, and support OE control
Low CPU clock jitter
≤
200 ps cycle-to-cycle
Low skew outputs
—
≤
250 ps between CPU clocks
—1ns
3ns skew between CPU and PCI clocks for com-
patibility with SiS 55XX as well as Intel 82430TX,
82430HX, and 82430VX chipsets (CY2267–1)
Improved output drivers are designed for low EMI
Meets Pentium and Pentium Pro power-up stabilization
requirements
3.3V operation, 5V tolerant inputs
Available in space-saving 34-pin SSOP package
The CY2267 is a low-cost Clock Synthesizer/Driver chip for a
Pentium, Pentium Pro, or Cyrix 6x86-based motherboard.
The CY2267 outputs sixteen CPU clocks, twelve of which can
be used to support up to three SDRAM modules. The PCI
clock output can be buffered with an external, low-cost Zero
Delay Buffer (CY2305/9), thus providing a complete solution
for 82430TX desktop systems.
The CPU clocks of the CY2267 have less than 200 ps cy-
cle-to-cycle jitter. Both the CPU and PCI clocks have a slew
rate of greater than 1V/ns. The USB clock meets Intel’s accu-
racy, jitter, and rise and fall time requirements.
All CPU clocks support fast clock stabilization on power-up
(< 2 ms). Additionally, two dedicated Frequency Select inputs
are used for Output Enable control and setting the CPU clock
output frequencies.
The CY2267 clock outputs are designed for low EMI emis-
sions. Controlled rise and fall times, unique output driver cir-
cuits, and innovative circuit layout techniques enable the
CY2267 to have lower EMI than clock devices from other man-
ufacturers. Please refer to the application note “Layout and
Termination Techniques for Cypress Clock Generators” for
more information on recommended system layout techniques.
The CY2267 accepts a 14.318 MHz reference crystal or clock
as its input and runs off a 3.3V supply. The CY2267 is available
in a space-saving, low-cost 34-pin SSOP package and is
pin-compatible with the CY2264 and CY2265.
Intel and Pentium are registered trademarks of Intel Corporation.
Cyrix is a registered trademark of Cyrix Corporation.
ROM
Pin Configuration
2267–a
Logic Block Diagram
XTALOUT
XTALIN
REFCLK (14.318MHz)
14.318
MHz
OSC.
1
2
3
4
5
6
7
8
9
10
11
12
21
22
23
24
25
26
30
29
28
27
13
14
31
34
33
32
Top View
SSOP
V
DD
XTALIN
XTALOUT
V
SS
CPUCLK16
CPUCLK1
CPUCLK2
V
DD
CPUCLK3
CPUCLK4
V
SS
CPUCLK5
CPUCLK6
V
DD
S1
S2
REFCLK
V
DD
IOCLK
USBCLK
V
SS
PCICLK
CPUCLK13
V
DD
CPUCLK12
CPUCLK11
V
SS
CPUCLK10
CPUCLK9
IOCLK (24MHz)
S1
S2
USBCLK (48MHz)
PCICLK
2267–b
CPUCLK [1–16]
CPU
PLL
SYS
PLL
/2
Delay
(–1only)
2
/2
16
17
CPUCLK15
CPUCLK7
18
19
20
V
SS
CPUCLK14
CPUCLK8
15
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| CY2272 | 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(gè) SO-DIMM的應(yīng)用于移動(dòng)PC機(jī)的奔騰6x86, K6 時(shí)鐘合成器/驅(qū)動(dòng)器) |
| CY2275A | PentiumII Clock Synthesizer/Driver for Desktop PCs with Intel 82440LX with 3 DIMMs(帶英特爾82440LX 和 3個(gè)DIMM的應(yīng)用于桌上型PC機(jī)的奔騰II時(shí)鐘合成器/驅(qū)動(dòng)器) |
| CY2276A-12 | PentiumII Clock Synthesizer/Driver for Desktop PCs with Intel 82440LX and 4 DIMMs(帶英特爾82440LX 和4個(gè)DIMM的應(yīng)用于桌上型PC機(jī)的奔騰II時(shí)鐘合成器/驅(qū)動(dòng)器) |
| CY2276A-13 | PentiumII Clock Synthesizer/Driver for Desktop PCs with Intel 82440LX and 4 DIMMs(帶英特爾82440LX 和4個(gè)DIMM的應(yīng)用于桌上型PC機(jī)的奔騰II時(shí)鐘合成器/驅(qū)動(dòng)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(jī)的奔騰II時(shí)鐘合成器/驅(qū)動(dòng)器) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| CY22701 | 制造商:CYPRESS 制造商全稱(chēng):Cypress Semiconductor 功能描述:1 PLL In-System Programmable Clock Generator |
| CY22701FSXC | 功能描述:鎖相環(huán) - PLL In Sys Program Clk COM RoHS:否 制造商:Silicon Labs 類(lèi)型:PLL Clock Multiplier 電路數(shù)量:1 最大輸入頻率:710 MHz 最小輸入頻率:0.002 MHz 輸出頻率范圍:0.002 MHz to 808 MHz 電源電壓-最大:3.63 V 電源電壓-最小:1.71 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:QFN-36 封裝:Tray |
| CY22701FSXCT | 制造商:CYPRESS 制造商全稱(chēng):Cypress Semiconductor 功能描述:1 PLL In-System Programmable Clock Generator |
| CY22701FSXI | 功能描述:鎖相環(huán) - PLL In Sys Program Clk IND RoHS:否 制造商:Silicon Labs 類(lèi)型:PLL Clock Multiplier 電路數(shù)量:1 最大輸入頻率:710 MHz 最小輸入頻率:0.002 MHz 輸出頻率范圍:0.002 MHz to 808 MHz 電源電壓-最大:3.63 V 電源電壓-最小:1.71 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:QFN-36 封裝:Tray |
| CY22701FSXIT | 制造商:CYPRESS 制造商全稱(chēng):Cypress Semiconductor 功能描述:1 PLL In-System Programmable Clock Generator |
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