ATMEL AT60142F Very low power consumption Datasheet

Active Errata List
1. Reading Error
Errata History
Lot Number
Errata List
All AT60142F lots
1
All AT60142FT lots
1
Errata Description
1. Reading error Description
Some AT60142 parts show a failure during read operation. Failure is always a 0 read
fail (read 1 instead of 0). Read 1 is always fine.
Error is located in:
Rad Hard 512K
x8 Very Low
Power CMOS
SRAM
- Bit 5 : less than 5 bits are impacted on last column and last but one line
- Bit 6 : only 1 bit is impacted on last column and last but one line
When Bit6 fails, Bit5 has always already failed.
Other bit planes are never impacted.
AT60142F/FT
Errata Sheet
The failure does not depend on activity on other addresses over the rest of memory.
Output enable has no influence on reading error behavior.
When a bit is failing, it can be reproduced any time on any tester at the same location,
in the same conditions.
In conclusion, there may exist a very narrow window, within which, if the chip select
line is asserted low and address lines change, a corruption of data Bit 5 (and Bit 6
sometimes) occurs during a RAM zero read access.
Typical window size is 0.2ns
Failure Conditions
•
Addresses are stable at time T0.
•
The RAM chip select (CSn) is driven low in a T0 - 4ns / T0 - 1ns timing window.
•
Worst case conditions: 125°C
7776E–AERO–06/08
Figure 1. Failure Conditions
Workaround
Datasheet is guaranteed out of the window described in errata-sheet for both AT60142F/FT.
1. As the first solution, Atmel strongly recommends the board designer to verify that best, typical and worst case conditions of the application do not lead to fall in the possible error window:
- chip select activated (driven Low) before T0-4ns
- chip select activated (driven Low) after T0-1ns
2. For boards falling in the not functional window, Atmel recommends to add a delay on CS
to be out of the window (no evolution out of the window in guaranteed life-time and radiation exposure). Delay can be done by any solution as serial resistor, serial buffer or other.
3. Atmel envisages giving a better TELQV value than currently specified in the datasheet
(about 1 ns improvement depending on versions). This improvement gives more margin
on CSn to escape from the error window.
2
AT60142F/FT
7776E–AERO–06/08
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7776E–AERO–06/08
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