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參數(shù)資料
| 型號： | CY2256 |
| 廠商： | Cypress Semiconductor Corp. |
| 英文描述： | Pentium and Cyrix 6x86 Compatible Clock Synthesizer/Driver for OPTi Viper Chipset(應(yīng)用于 OPTi Viper芯片組的奔騰和 Cyrix公司 6x86兼容的時鐘合成器/驅(qū)動器) |
| 中文描述： | 奔騰，Cyrix 6x86兼容的時鐘合成器/芯片組的奧普蒂蝰蛇（應(yīng)用于奧普蒂蝰蛇芯片組的奔騰和Cyrix公司6x86兼容的時鐘合成器/驅(qū)動器驅(qū)動程序） |
| 文件頁數(shù)： | 1/7頁 |
| 文件大小： | 97K |
| 代理商： | CY2256 |
Pentium and Cyrix 6x86 Compatible Clock
Synthesizer/Driver for OPTi Viper Chipset
CY2256
Cypress Semiconductor Corporation
3901 North First Street
San Jose
CA 95134
408-943-2600
October 1996 - Revised June 12, 1997
Features
Multiple clock outputs to meet all requirements of Pen-
tium or Cyrix 6x86-based motherboards using the
OPTi Viper chipset
—Five CPU clocks (CPUCLK) @ 75 MHz, 66.66 MHz,
60.0 MHz or 50.0 MHz, pin selectable
—Seven PCI clocks (PCICLK) @ 25.0 MHz, 30.0 MHz or
33.3 MHz, pin selectable
—Two Ref. clocks @ 14.318 MHz
—Ref. 14.318 MHz Xtal oscillator input
Low CPU and PCI clock jitter < 250 ps cycle-to-cycle in
synchronous PCI mode
Low skew outputs
—< 200 ps between CPU clocks
—
<
200 ps between PCI clocks
—
<
500 ps max. skew between CPU and PCI Clocks (in
synchronous mode)
Output duty cycle 45% min. to 55% max.
Available in space-saving 28-pin SOIC and SSOP pack-
ages
3.3V or 5.0V operation
Internal pull-up resistors on select input
Bank selectable CPU clock for synchronous DRAM
support
Functional Description
The CY2256 is a Clock Synthesizer/Driver chip for a Pentium
or Cyrix 6x86-based PC using the OPTi Viper chipset. The
CY2256 has low-skew outputs (< 200 ps between the CPU
Clocks, < 200 ps between the PCI Clocks). In addition, the
CY2256 CPU clock outputs have less than 250 ps cycle-to-cy-
cle jitter. Finally, both the PCI and CPU clock outputs meet the
1V/ns slew rate requirement of the Pentium processor-based
system.
The CY2256 accepts a 14.318 MHz reference crystal or clock
as its input. The CY2256 has two PLLs, one of which gener-
ates the CPU clocks, and the other generates the PCI clocks.
The CY2256 runs off a 3.3V or 5.0V supply.
s
Intel is a registered trademark of Intel Corporation.
OPTi Viper is a trademark of OPTi Corporation.
Pentium is a trademark of Intel Corporation.
Pin Configuration
2256–1
Logic Block Diagram
XTALOUT
XTALIN
REF0(14.318MHz)
14.318
MHz
OSC.
1
2
3
4
5
6
7
8
9
10
11
12
15
16
17
18
19
20
24
23
22
21
13
14
25
28
27
26
Top View
SOIC/SSOP
V
DD
XTALIN
XTALOUT
V
SS
S2
CPUCLKA0
CPUCLKA1
V
DD
CPUCLKA2
V
SS
S1
S0
V
DD
REF0
REF1
V
DD
PCICLK6
PCICLK5
V
SS
PCICLK4
PCICLK3
V
DD
PCICLK2
PCICLK1
V
SS
PCICLK0
CPUCLKB0
Note:
CPUCLK = CPU Clock
PCICLK= PCI Bus Clock
REF1(14.318MHz)
PCICLK3
PCICLK4
PCICLK5
PCICLK6
CPUCLKA0
CPU
PLL
ROM
S0
S1
CPUCLKA1
CPUCLKA2
CPUCLKA3
2256–2
PCICLK2
CPUCLKA3
PCICLK0
PCICLK1
PCI
PLL
S2
2
MUX
CPUCLKB0
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PDF描述 |
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| CY2273A | 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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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| CY225670SNC | 制造商:Cypress Semiconductor 功能描述: |
| CY2256PVC-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 |
| CY2256SC-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 |
| CY2257 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:CPU System Clock Generator |
| CY2257SC1 | 制造商:CYPRESS 功能描述:* |
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