欢迎访问ic37.com |
会员登录 免费注册
发布采购

C9827H 参数 Datasheet PDF下载

C9827H图片预览
型号: C9827H
PDF下载: 下载PDF文件 查看货源
内容描述: 高性能的Pentium 4的时钟合成器 [High Performance Pentium 4 Clock Synthesizer]
分类和应用: 时钟
文件页数/大小: 25 页 / 172 K
品牌: CYPRESS [ CYPRESS ]
 浏览型号C9827H的Datasheet PDF文件第11页浏览型号C9827H的Datasheet PDF文件第12页浏览型号C9827H的Datasheet PDF文件第13页浏览型号C9827H的Datasheet PDF文件第14页浏览型号C9827H的Datasheet PDF文件第16页浏览型号C9827H的Datasheet PDF文件第17页浏览型号C9827H的Datasheet PDF文件第18页浏览型号C9827H的Datasheet PDF文件第19页  
Approved Product  
C9827H  
High Performance Pentium® 4 Clock Synthesizer  
Special Functions  
PCI_F and IOAPIC Clock Outputs  
The PCIF clock outputs are intended to be used, if required, for systems IOAPIC clock functionality. ANY 2 of the  
PCI_F clock outputs can be used as IOAPIC 33Mhz clock outputs. They are 3.3V outputs will be divided down via a  
simple resistive voltage divider to meet specific system IOAPIC clock voltage requirements. In the event these clocks  
are not required, then these clocks can be used as general PCI clocks or disabled via the assertion of the PCI_STP#  
pin.  
3V66_1/VCH Clock Output  
The 3V66_1/VCH pin has a dual functionality, which is selectable via SMBus.  
Configured as DRCG (66M), SMBus Byte0, Bit 5 = ‘0’  
The default condition for this pin is to power up in a 66M operation. In 66M operation this output is SSCG capable and  
when spreading is turned on, this clock will be modulated.  
Configured as VCH (48M), SMBus Byte0, Bit 5 = ‘1’  
In this mode, the output is configured as a 48Mhz non-spread spectrum output. This output is phase aligned with the  
other 48M outputs (USB and DOT), to within 1ns pin to pin skew. The switching of 3V66_1/VCH into VCH mode  
occurs at system power on. When the SMBus Bit 5 of Byte 0 is programmed from a ‘0’ to a ‘1’, the 3V66_1/VCH  
output may glitch while transitioning to 48M output mode.  
CPU_STP# Clarification  
The CPU_STP# signal is an active low input used for synchronous stopping and starting the CPU output clocks while  
the rest of the clock generator continues to function.  
Cypress Semiconductor Corporation  
http://www.cypress.com  
Document#: 38-07106 Rev. *A  
12/26/2002  
Page 15 of 25  
 复制成功!