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參數(shù)資料
型號: W83195R-08
廠商: WINBOND ELECTRONICS CORP
元件分類: XO, clock
英文描述: 150MHZ 4-DIMM Clock(頻率為150MHZ、3-DIMM 時鐘)
中文描述: 150 MHz, PROC SPECIFIC CLOCK GENERATOR, PDSO56
封裝: SSOP-56
文件頁數(shù): 15/18頁
文件大小: 230K
代理商: W83195R-08
W83195R-08
PRELIMINARY
Publication Release Date: Mar. 1999
- 15 - Revision 0.30
11.0 OPERATION OF DUAL FUCTION PINS
Pins 2,8, 9, 29,30 are dual function pins and are used for selecting different functions in this device
(see Pin description). During power up, these pins are in input mode (see Fig1), therefore, and are
considered input select pins. When Vdd reaches 2.5V, the logic level that is present on these pins is
latched into their appropriate internal registers. Once the correct information is properly latched,
these pins will change into output pins and will be pulled low by default. At the end of the power up
timer (within 3 ms) outputs starts to toggle at the specified frequency.
Within 3ms
Input
Output
Output
tri-state
Output
pull-low
2.5V
Output
tri-state
Output
pull-low
#2 REF1/ FS2*
#8 PCICLK_F/ MODE*
#9 PCICLK0/ FS3*
#30 24/FS0
#29 48/FS1
All other clocks
Vdd
Each of these pins has a large pull-up resistor ( 250 k
@3.3V ) inside. The default state will be logic
1, but the internal pull-up resistor may be too large when long traces or heavy load appear on these
dual function pins. Under these conditions, an external 10 k
resistor is recommended to be
connected to Vdd if logic 1 is expected. Otherwise, there should be direct connection to ground if a
logic 0 is desired. The 10 k
resistor should be placed before the serious terminating resistor. Note
that these logic will only be latched at initial power on.
If optional EMI reducing capacitor are needed, they should be placed as close to the series
terminating resistor as possible and after the series terminating resistor. These capacitors have
typical values ranging from 4.7pF to 22pF.
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