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| 型号： | ICS9248-199 |
| 英文描述： | Frequency Generator for SIS 735/740 with AMD K7 Processor |
| 中文描述： | 频率发生器与AMD k7的处理器为SIS的740分之735 |
| 文件页数： | 16/21页 |
| 文件大小： | 181K |
| 代理商： | ICS9248-199 |
16
ICS9248-199
0376E—12/23/02
Fig. 1
Shared Pin Operation -
Input/Output Pins
The I/O pins designated by (input/output) on the ICS9248-
199 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 5-bit internal data latch. At the end of
Power-On reset, (see AC characteristics for timing values),
the device changes the mode of operations for these pins
to an output function. In this mode the pins produce the
specified buffered clocks to external loads.
To program (load) the internal configuration register for
these pins, a resistor is connected to either the VDD
(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.
Via to
VDD
Clock trace to load
Series Term. Res.
Programming
Header
Via to Gnd
Device
Pad
2K
8.2K
Figure 1 shows a means of implementing this function
when a switch or 2 pin header is used. With no jumper is
installed the pin will be pulled high. With the jumper in
place the pin will be pulled low. If programmability is not
necessary, than only a single resistor is necessary. The
programming resistors should be located close to the
series termination resistor to minimize the current loop
area. It is more important to locate the series termination
resistor close to the driver than the programming resistor.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ICS9248-20 | 制造商:ICS 制造商全称:ICS 功能描述:Pentium/ProTM System Clock Chip |
| ICS9248-39 | 制造商:ICS 制造商全称:ICS 功能描述:Frequency Generator & Integrated Buffers for PENTIUM/ProTM |
| ICS9248-50 | 制造商:ICS 制造商全称:ICS 功能描述:Frequency Timing Generator for Pentium II Systems |
| ICS9248-50_1 | 制造商:ICS 制造商全称:ICS 功能描述:Frequency Timing Generator for Pentium II Systems |
| ICS9248-55 | 制造商:ICS 制造商全称:ICS 功能描述:Pentium/Pro/IITM System Clock Chip |
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