DSP56824 datasheet(21/62 Pages) FREESCALE

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AC Electrical Characteristics

DSP56824 Technical Data

3.3 AC Electrical Characteristics

(VSS = 0 V, VDD = 2.7–3.6 V, TA = –40° to +85°C, CL = 50 pF)

Timing waveforms in Section 3.3, “AC Electrical Characteristics,” are tested with a VIL maximum of 0.8

V and a VIH minimum of 2.0 V for all pins except EXTAL, which is tested using the input levels in

Section 3.2, “DC Electrical Characteristics.” Figure 3 shows the levels of VIH and VIL for an input signal.

Figure 3. Input Signal Measurement References

Figure 4 shows the definitions of the following signal states:

•

Active state, when a bus or signal is driven , and enters a low impedance state.

•

Tristated, when a bus or signal is placed in a high impedance state.

•

Data Valid state, when a signal level has reached VOL orVOH.

•

Data Invalid state, when a signal level is in transition between VOL and VOH.

Figure 4. Signal States

VIH

VIL

Fall Time

Input Signal

Note: The midpoint is VIL + (VIH – VIL)/2.

Midpoint1

Low

High

Pulse Width

90%

50%

10%

Rise Time

AA1447

Data Invalid State

Data1

Data2 Valid

Data

Tristated

Data3 Valid

Data2

Data3

AA1448

Data1 Valid

Data Active

Freescale Semiconductor, Inc.

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