10.3 AC Electrical Characteristics
Tests are conducted using the input levels specified in Table 10-5. Unless otherwise specified,
propagation delays are measured from the 50% to the 50% point, and rise and fall times are measured
between the 10% and 90% points, as shown in Figure 10-1.
Low
VIL
High
VIH
90%
50%
10%
Input Signal
Midpoint1
Fall Time
Note: The midpoint is VIL + (VIH – VIL)/2.
Rise Time
Figure 10-1 Input Signal Measurement References
Figure 10-2 shows the definitions of the following signal states:
•
•
•
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 VOL or VOH
•
Data Invalid state, when a signal level is in transition between VOL and VOH
Data2 Valid
Data2
Data1 Valid
Data1
Data3 Valid
Data3
Data
Tri-stated
Data Invalid State
Data Active
Data Active
Figure 10-2 Signal States
10.4 Flash Memory Characteristics
Table 10-12 Flash Timing Parameters
Characteristic
Symbol
Tprog
Terase
Tme
Min
20
Typ
—
Max
—
Unit
μs
Program time1
Erase time2
20
—
—
ms
ms
Mass erase time
100
—
—
1. There is additional overhead which is part of the programming sequence. See the 56F8300 Peripheral User Manual
for details. Program time is per 16-bit word in Flash memory. Two words at a time can be programmed within the Pro-
gram Flash module, as it contains two interleaved memories.
56F8355 Technical Data, Rev. 12
138
Freescale Semiconductor
Preliminary
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