參數(shù)資料
型號： 951416AGLFT
廠商： INTEGRATED DEVICE TECHNOLOGY INC
元件分類： 時鐘產(chǎn)生/分配
英文描述： 220 MHz, PROC SPECIFIC CLOCK GENERATOR, PDSO56
封裝： 6.10 MM, 0.50 MM PITCH, GREEN, MO-153, TSSOP-56
文件頁數(shù)： 15/27頁
文件大?。?/td> 248K
代理商： 951416AGLFT
22
ICS951416
0937H—05/26/05
Fig. 1
Shared Pin Operation -
Input/Output Pins
The I/O pins designated by (input/output) on the ICS951416
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
W
8.2K
W
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.
相關PDF資料
PDF描述
951462YGLFT PROC SPECIFIC CLOCK GENERATOR, PDSO64
951464YFLFT 240 MHz, OTHER CLOCK GENERATOR, PDSO56
951601AFLF 66.66 MHz, PROC SPECIFIC CLOCK GENERATOR, PDSO48
951901AF 133.34 MHz, PROC SPECIFIC CLOCK GENERATOR, PDSO48
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