dsp56857 Freescale Semiconductor, Inc, dsp56857 Datasheet - Page 26

• Manufacturer Part Number: dsp56857
• Description: Dsp56857 Digital Signal Controller
• Manufacturer: Freescale Semiconductor, Inc

4.4 AC Electrical Characteristics
Timing waveforms in
all pins except XTAL, which is tested using the input levels in
and V
Figure 4-5
26
•
•
•
•
IL
Input Signal
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
for an input signal are shown.
Note: The midpoint is V
shows the definitions of the following signal states:
Data Invalid State
Data1 Valid
Data1
Section 4.4
Figure 4-4 Input Signal Measurement References
Fall Time
IL
Data Active
+ (V
Midpoint1
IH
V
are tested with a V
– V
IH
IL
Figure 4-5 Signal States
)/2.
56857 Technical Data, Rev. 6
Data2 Valid
Data2
Low
V
IL
IL
OL
maximum of 0.8V and a V
or V
Tri-stated
OH
Section
Data
OL
Rise Time
and V
4.2. In
High
OH
Figure 4-4
Data3 Valid
Data Active
Data3
IH
minimum of 2.0V for
Freescale Semiconductor
90%
50%
the levels of V
10%
IH