MC68HC908EY16 Datasheet, PDF (251/278 Pages) Motorola, Inc – Microcontrollers

20.12 Memory Characteristics
Memory Characteristics
Characteristic
Symbol
Min
Typ
Max
Unit
RAM data retention voltage
FLASH program bus clock frequency
V_RDR
—
1.3
—
1
—
—
V
—
MHz
FLASH read bus clock frequency
FLASH page erase time
<1 K cycles
>1 K cycles
f_Read(1)
0
—
8M
Hz
t_Erase
0.9
1
1.1
ms
3.6
4
5.5
FLASH mass erase time
FLASH PGM/ERASE to HVEN setup time
FLASH high-voltage hold time
FLASH high-voltage hold time (mass erase)
FLASH program hold time
FLASH program time
t_MErase
t_NVS
t_NVH
t_NVHL
t_PGS
t_PROG
4
—
10
—
5
—
100
—
5
—
30
—
—
ms
—
µs
—
µs
—
µs
—
µs
40
µs
FLASH return to read time
FLASH cumulative program hv period
t_RCV(2)
t_HV(3)
1
—
—
µs
—
—
4
ms
FLASH endurance⁽⁴⁾
—
10 k
100 k
—
Cycles
FLASH data retention time⁽⁵⁾
—
15
100
—
Years
1. f_Read is defined as the frequency range for which the FLASH memory can be read.
2. t_RCV 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.
3. t_HV is defined as the cumulative high voltage programming time to the same row before next erase.
t_HV must satisfy this condition: t_NVS + t_NVH + t_PGS + (t_PROG x 64) ≤ t_HV maximum.
4. Typical endurance was evaluated for this product family. For additional information on how Freescale defines Typical
Endurance, please refer to Engineering Bulletin EB619.
5. Typical data retention values are based on intrinsic capability of the technology measured at high temperature and de-rated
to 25°C using the Arrhenius equation. For additional information on how Freescale defines Typical Data Retention, please
refer to Engineering Bulletin EB618.
6. In the 125°C to 135°C temperature range, the FLASH is guaranteed as read only.
MC68HC908EY16 • MC68HC908EY8 Data Sheet, Rev. 10
Freescale Semiconductor
251