參數(shù)資料
型號： SM320F2812HFGM
廠商： TEXAS INSTRUMENTS INC
元件分類： 數(shù)字信號處理
英文描述： 16-BIT, 150 MHz, OTHER DSP, CQFP172
封裝： NCTB, CERAMIC, QFP-172
文件頁數(shù)： 136/147頁
文件大?。?/td> 1721K
代理商： SM320F2812HFGM
Electrical Specifications
89
December 2004
SGUS053
6.8
Signal Transition Levels
Note that some of the signals use different reference voltages, see the recommended operating conditions
table. Output levels are driven to a minimum logic-high level of 2.4 V and to a maximum logic-low level of
0.4 V.
Figure 64 shows output levels.
0.4 V (VOL)
20%
2.4 V (VOH)
80%
Figure 64. Output Levels
Output transition times are specified as follows:
For a high-to-low transition, the level at which the output is said to be no longer high is below 80% of the
total voltage range and lower and the level at which the output is said to be low is 20% of the total voltage
range and lower.
For a low-to-high transition, the level at which the output is said to be no longer low is 20% of the total
voltage range and higher and the level at which the output is said to be high is 80% of the total voltage
range and higher.
Figure 65 shows the input levels.
0.8 V (VIL)
10%
2.0 V (VIH)
90%
Figure 65. Input Levels
Input transition times are specified as follows:
For a high-to-low transition on an input signal, the level at which the input is said to be no longer high is
90% of the total voltage range and lower and the level at which the input is said to be low is 10% of the
total voltage range and lower.
For a low-to-high transition on an input signal, the level at which the input is said to be no longer low is
10% of the total voltage range and higher and the level at which the input is said to be high is 90% of the
total voltage range and higher.
NOTE: See the individual timing diagrams for levels used for testing timing parameters.
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