MC908JL3ECPE Datasheet, PDF(163/180 Page) Freescale Semiconductor, Inc

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MC908JL3ECPE Datasheet, PDF (163/180 Pages) Freescale Semiconductor, Inc – Microcontrollers

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A.5.6 Memory Characteristics

The Flash memory can only be read at an operating voltage of 2.2 to 5.5V. Program and erase are

achieved at an operating voltage of 2.7 to 5.5V. The program and erase parameters in Table A-6 are for

VDD = 2.7 to 5.5V only.

Table A-6. Memory Characteristics

Characteristic

RAM data retention voltage

Flash program bus clock frequency

Flash read bus clock frequency

Flash page erase time

Flash mass erase time

Flash PGM/ERASE to HVEN set up time

Flash high-voltage hold time

Flash high-voltage hold time (mass erase)

Flash program hold time

Flash program time

Flash return to read time

Flash cumulative program hv period

Flash row erase endurance(6)

Flash row program endurance(7)

Flash data retention time(8)

Symbol

VRDR

fRead(1)

tErase(2)

tMErase(3)

tnvs

tnvh

tnvhl

tpgs

tPROG

trcv(4)

tHV(5)

Min

Max

Unit

1.3

MHz

32 k

Î¼s

100

Î¼s

10 k

cycles

10 k

cycles

years

1. fRead is defined as the frequency range for which the Flash memory can be read.

2. If the page erase time is longer than tErase (Min), there is no erase-disturb, but it reduces the endurance of the Flash mem-

ory.

3. If the mass erase time is longer than tMErase (Min), there is no erase-disturb, but it reduces the endurance of the Flash

memory.

4. trcv is defined as the time it needs before the Flash can be read after turning off the high voltage charge pump, by clearing

HVEN to 0.

5. tHV is defined as the cumulative high voltage programming time to the same row before next erase.

tHV must satisfy this condition: tnvs + tnvh + tpgs + (tPROG Ã 32) â¤ tHV max.

6. The minimum row endurance value specifies each row of the Flash memory is guaranteed to work for at least this many

erase / program cycles.

7. The minimum row endurance value specifies each row of the Flash memory is guaranteed to work for at least this many

erase / program cycles.

8. The Flash is guaranteed to retain data over the entire operating temperature range for at least the minimum time specified.

MC68HC908JL3E Family Data Sheet, Rev. 4

Freescale Semiconductor

163

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