dsp56853 Freescale Semiconductor, Inc, dsp56853 Datasheet - Page 28

• Manufacturer Part Number: dsp56853
• Description: 16-bit Digital Signal Controllers
• Manufacturer: Freescale Semiconductor, Inc

4.4 AC Electrical Characteristics
Timing waveforms in
for all pins except XTAL, which is tested using the input levels in
V
Figure 4-5
28
IH
•
•
•
•
and V
Input Signal
Note: The midpoint is V
Active state, when a bus or signal is driven, and enters a low impedance state.
Tri-stated, when a bus or signal is placed in a high impedance state.
Data Valid state, when a signal level has reached V
Data Invalid state, when a signal level is in transition between V
IL
shows the definitions of the following signal states:
Supply
for an input signal are shown.
Data Invalid State
Data1 Valid
Figure 4-3 Example Circuit to Control Supply Sequencing
Data1
Regulator
Section 4.2
3.3V
Figure 4-4 Input Signal Measurement References
Fall Time
IL
+ (V
Midpoint1
Data Active
IH
V
– V
IH
are tested with a V
IL
)/2.
Figure 4-5 Signal States
56853 Technical Data, Rev. 6
Data2 Valid
Data2
Regulator
Low
V
1.8V
IL
IL
OL
maximum of 0.8 V and a V
or V
Tri-stated
OH.
Data
Section
OL
Rise Time
and V
High
4.2. In
OH.
Data3 Valid
V
Data3
Data Active
DDIO,
Figure 4-4
V
Freescale Semiconductor
IH
V
DD
DDA
minimum of 2.0 V
90%
50%
10%
the levels of