音影先锋亚洲天堂网|电影世界尽头的爱完整版播放|国产 熟女 91|高清无码免费观看欧美日韩|韩国一区二区三区黄色录像|美女亚洲加勒比在线|亚洲综合网 开心五月|7x成人在线入口|成人网站免费日韩毛片区|国产黄片?一级?二级?三级

CY2254A Datasheet

  • CY2254A

  • Pentium Processor Compatible Clock Synthesizer/Driver

  • 97.69KB

  • 8頁

  • CYPRESS

掃碼查看芯片數(shù)據(jù)手冊

上傳產(chǎn)品規(guī)格書

PDF預(yù)覽

4A
CY2254A
Pentium
廬
Processor Compatible
Clock Synthesizer/Driver
Features
鈥?Multiple clock outputs to meet requirements of most
Pentium
廬
motherboards
鈥?Four pin-selectable CPU clocks @ 66.66 MHz, 60.0
MHz, and 50.0 MHz for support of Intel Triton
鈩?/div>
PCIset
based PC
鈥?55.0 MHz pin-selectable CPU clock also available (鈭?
option only)
鈥?Six PCI clocks at 1/2 CPU Clock frequency
鈥?One I/O clock @ 24 MHz
鈥?One Keyboard Controller clock @ 12 MHz (鈭? option)
or one Universal Serial Bus clock @ 48 MHz
(鈭? option)
鈥?Two Ref. clocks @ 14.318 MHz
鈥?Ref. 14.318 MHz Xtal oscillator input
鈥?CPU clock jitter < 200 ps cycle-to-cycle
鈥?Low skew outputs
鈥?< 250 ps between CPU clocks
鈥?< 250 ps between PCI clocks
鈥?< 500 ps between CPU and PCI clocks (鈭? option)
鈥?CPU clock leads PCI clock by +1 ns min. to +4 ns
max. (鈭? option)
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
Freq. stability = 0.01% (max.)
Output duty cycle 45% min. to 55% max.
Test mode support (鈭? option only)
3.3V or 5.0V operation
Internal pull-up resistors on S0, S1, and OE inputs
Functional Description
The CY2254A is a Clock Synthesizer/Driver that provides the
multiple clocks required for a Pentium-based PC. The
CY2254A has low-skew outputs (< 250 ps between the CPU
Clocks, < 250 ps between the PCI Clocks). In addition, the
CY2254A CPU clock outputs have less than 200 ps cy-
cle-to-cycle jitter. Finally, both the PCI and CPU clock outputs
meet the 1 V/ns slew rate requirement of a Pentium proces-
sor-based system.
The CY2254A accepts a 14.318 MHz reference signal as its
input. The CY2254A has 2 PLLs, one of which generates the
CPU and PCI clocks, and the other generates the I/O and Key-
board Controller or USB clocks. The CY2254A runs off either
a 3.3V or 5V supply.
The CY2254A is available in two options. The
鈭?
option sup-
ports the Intel Triton PCIset and provides a 12 MHz keyboard
clock on pin 25. The
鈭?
option provides a 48 MHz USB clock
on pin 25 and supports the Cyrix
廬
M1 processor.
Logic Block Diagram
REF0 (14.318 MHz)
REF1 (14.318 MHz)
SYS
PLL
XTALIN
XTALOUT
14.318
MHz
OSC.
CPU
PLL
ROM
S0
S1
鈭?
option only
Pin Configuration
Top View
SOIC
V
DD
XTALIN
XTALOUT
V
SS
OE
CPUCLK0
CPUCLK1
V
DD
CPUCLK2
CPUCLK3
V
SS
S1
S0
V
DD
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
REF0
REF1
V
DD
SEEBELOW
IOCLK
V
SS
PCICLK2
PCICLK3
V
DD
PCICLK4
PCICLK5
V
SS
PCICLK1
PCICLK0
梅
2
梅
2
KBDCLK (12 MHz)
IOCLK (24 MHz)
USBCLK (48 MHz)
CPUCLK0
CPUCLK1
CPUCLK2
CPUCLK3
梅
2
DELAY
PCICLK0
PCICLK1
PCICLK2
PCICLK3
PCICLK4
PCICLK5
OPTION
鈭?
鈭?
PIN 25
KBDCLK
12 MHz
USBCLK
48 MHz
OE
Intel and Pentium are registered trademarks of Intel Corporation.
Triton is a trademark of Intel Corporation.
Cyrix is a registered trademark of Cyrix Corporation.
Cypress Semiconductor Corporation
Document #: 38-07203 Rev. *A
鈥?/div>
3901 North First Street
鈥?/div>
San Jose
鈥?/div>
CA 95134 鈥?408-943-2600
Revised December 14, 2002

CY2254A相關(guān)型號PDF文件下載

  • 型號
    版本
    描述
    廠商
    下載
  • 英文版
    133-MHz Spread Spectrum Clock Synthesizer/Driver with AGP, U...
    CYPRESS
  • 英文版
    133-MHz Spread Spectrum Clock Synthesizer/Driver with AGP, U...
    CYPRESS [C...
  • 英文版
    Clocks and Buffers
    ETC
  • 英文版
    Direct Rambus? Clock Generator (Lite)
    CYPRESS
  • 英文版
    High-Frequency Programmable PECL Clock Generator
    CYPRESS
  • 英文版
    High-Frequency Programmable PECL Clock Generator
    CYPRESS [C...
  • 英文版
    133-MHz Spread Spectrum Frequency Timing Generator
    Cypress
  • 英文版
    133-MHz Spread Spectrum Clock Synthesizer/Driver With Differ...
    CYPRESS
  • 英文版
    133-MHz Spread Spectrum Clock Synthesizer/Driver With Differ...
    CYPRESS [C...
  • 英文版
    CPU System Clock Generator
    ETC
  • 英文版
    CPU System Clock Generator
  • 英文版
    CPU System Clock Generator
    ETC
  • 英文版
    CPU System Clock Generator
  • 英文版
    Pentium and Cyrix 6x86 Compatible Clock Synthesizer/Driver f...
    Cypress
  • 英文版
    CPU System Clock Generator
    ETC
  • 英文版
    CPU System Clock Generator
  • 英文版
    Pentium Pentium?Pro, and Cyrix?6x86Compatible Clock Synthes...
    Cypress
  • 英文版
    Pentium 6x86, K6 Clock Synthesizer/Driver for Mobile PCs wi...
    Cypress
  • 英文版
    100-MHz Pentium II Clock Synthesizer/Driver with Spread Spec...
    CYPRESS
  • 英文版
    100-MHz Pentium II Clock Synthesizer/Driver with Spread Spec...
    CYPRESS [C...

掃碼下載APP，
一鍵連接廣大的電子世界。

在線人工客服

買家服務(wù)：
賣家服務(wù)：
技術(shù)客服：

0571-85317607

網(wǎng)站技術(shù)支持

13606545031

客服在線時間周一至周五
9:00-17:30

關(guān)注官方微信號，
第一時間獲取資訊。

建議反饋

聯(lián)系人：

聯(lián)系方式：

按住滑塊，拖拽到最右邊
>>
感謝您向阿庫提出的寶貴意見，您的參與是維庫提升服務(wù)的動力！意見一經(jīng)采納，將有感恩紅包奉上哦！