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ICS9169CJ-27 参数 Datasheet PDF下载

ICS9169CJ-27图片预览
型号: ICS9169CJ-27
PDF下载: 下载PDF文件 查看货源
内容描述: 频率发生器奔腾™的系统 [Frequency Generator for Pentium™ Based Systems]
分类和应用:
文件页数/大小: 8 页 / 557 K
品牌: ICSI [ INTEGRATED CIRCUIT SOLUTION INC ]
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ICS9169C-27  
Shared Pin Operation -  
Input/Output Pins  
Test Mode Operation  
The ICS9169C-27 includes a production test verification  
mode of operation. This requires that the FS0 and FS1 pins  
be programmed to a logic high and the FS2 pin be  
programmed to a logic low(see Shared Pin Operation section).  
In this mode the device will output the following  
frequencies.  
Shared Pin Operation - Input/Output Pins 5, 12, 13 and 32  
on the ICS9169C-27 serve as dual signal functions to the  
device. During initial power-up, they act as input pins. The  
logic level (voltage) that is present on these pins at this time  
is read and stored into a 4-bit internal data latch. At the end  
of Power-On reset, (seeAC characteristics for timing values),  
the device changes the mode of operation for these pins to  
an output function. In this mode the pins produce the  
specified buffered clocks to external loads.  
Pin  
Frequency  
REF  
REF/2  
REF/4  
REF2  
REF/4  
REF/3  
REF  
48MHz  
24MHz  
CPU (1:12)  
To program (load) the internal configuration register for  
these pins, a resistor is connected to either theVDD (logic 1)  
power supply or the GND (logic 0) voltage potential. A 10  
Kilohm(10K) resistor is used to provide both the solid  
CMOS programming voltage needed during the power-up  
programming period and to provide an insignificant load on  
the output clock during the subsequent operating period.  
BSEL=1  
BSEL = 0  
BUS (1:6)  
Note: REF is the frequency of either the crystal connected  
between the devices X1and X2 or, in the case of a device  
being driven by an external reference clock, the frequency  
of the reference (or test) clock on the device’s X1 pin.  
Figs. 1 and 2 show the recommended means of implementing  
this function. In Fig. 1 either one of the resistors is loaded  
onto the board (selective stuffing) to configure the device’s  
internal logic. Figs. 2a and b provide a single resistor loading  
option where either solder spot tabs or a physical jumper  
header may be used.  
These figures illustrate the optimal PCB physical layout  
options. These configuration resistors are of such a large  
ohmic value that they do not effect the low impedance clock  
signals. The layouts have been optimized to provide as little  
impedance transition to the clock signal as possible, as it  
passes through the programming resistor pad(s).  
(Resistors are surface mount devices  
shown schematically between 5.m. pads)  
*use only one programming resistor  
Fig. 1  
3