Texas Instruments Digital Signal Processor SM320F2812-HT - Manual (Page 91)

0.4 V (V
OL
)
20%
2.4 V (V
OH
)
80%
0.8 V (V
IL
)
10%
2.0 V (V
IH
)
90%
SM320F2812-HT
www.ti.com 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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