Texas-instruments Digital Signal Processor SM320F2812-HT Instrukcja Użytkownika Pobierz pdf (Strona 91)

0.4 V (V

)

20%

2.4 V (V

)

80%

0.8 V (V

)

10%

2.0 V (V

)

90%

SM320F2812-HT

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SGUS062B– JUNE 2009– REVISED JUNE 2011

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 6-5 shows output levels.

Figure 6-5. 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 6-6 shows the input levels.

Figure 6-6. 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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Texas-instruments Digital Signal Processor SM320F2812-HT Instrukcja Użytkownika Strona 91