AT45DB021D_09 datasheet(33/54 Pages) ATMEL

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3638I–DFLASH–04/09

AT45DB021D

both +25°C and +125°C and with a supply voltage of 3.7V, which exceeds the specified

datasheet operating voltage range. The results of all of the extensive tests indicate that the con-

tents of a portion of memory being read continuously could be altered after 800,000,000 read

operations only if that portion of the memory was not erased or reprogrammed at all during the

800,000,000 read operations. If that portion of memory was reprogrammed at some point, then it

would take another 800,000,000 read operations after reprogramming before the contents could

potentially be altered. For example, if the Serial Flash is being used for boot code storage, then

it would take 800,000,000 boot operations before that boot code may become altered, provided

that the boot code was not updated or reprogrammed. If an application was to read the entire

memory array non-stop at a clock frequency of 10MHz, it would take over 5 years to reach

800,000,000 read operations. Atmel firmly believes that this extended testing result should not

be a cause for concern. We also believe that most, if not all, applications will never read the

same portion of memory 800,000,000 times throughout the life of the application without ever

updating that portion of memory.

18. Electrical Specifications

Table 18-1.

Absolute Maximum Ratings*

Temperature under Bias ................................ -55

°C to +125°C

*NOTICE:

Stresses beyond those listed under “Absolute

Maximum Ratings” may cause permanent dam-

age to the device. The "Absolute Maximum Rat-

ings" are stress ratings only and functional

operation of the device at these or any other con-

ditions beyond those indicated in the operational

sections of this specification is not implied. Expo-

sure to absolute maximum rating conditions for

extended periods may affect device reliability.

Voltage Extremes referenced in the "Absolute

Maximum Ratings" are intended to accommo-

date short duration undershoot/overshoot condi-

tions and does not imply or guarantee functional

device operation at these levels for any extended

period of time

Storage Temperature ..................................... -65

°C to +150°C

All Input Voltages (except VCC but including NC pins))

with Respect to Ground ...................................-0.6V to +6.25V

All Output Voltages

with Respect to Ground .............................-0.6V to VCC + 0.6V

Table 18-2.

DC and AC Operating Range

AT45DB021D

Operating Temperature (Case)

Ind.

-40

°C to 85°C

VCC Power Supply

2.7V to 3.6V

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