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 Headquarters International Atmel Corporation 2325 Orchard Parkway San Jose, CA 95131 USA Tel: 1(408) 441-0311 Fax: 1(408) 487-2600 Atmel Asia Room 1219 Chinachem Golden Plaza 77 Mody Road Tsimshatsui East Kowloon Hong Kong Tel: (852) 2721-9778 Fax: (852) 2722-1369 Atmel Europe Le Krebs 8, Rue Jean-Pierre Timbaud BP 309 78054 Saint-Quentin-enYvelines Cedex France Tel: (33) 1-30-60-70-00 Fax: (33) 1-30-60-71-11 Atmel Japan 9F, Tonetsu Shinkawa Bldg. 1-24-8 Shinkawa Chuo-ku, Tokyo 104-0033 Japan Tel: (81) 3-3523-3551 Fax: (81) 3-3523-7581 Technical Support [email protected] Sales Contact www.atmel.com/contacts Product Contact Web Site www.atmel.com Literature Requests www.atmel.com/literature Disclaimer: The information in this document is provided in connection with Atmel products. No license, express or implied, by estoppel or otherwise, to any intellectual property right is granted by this document or in connection with the sale of Atmel products. EXCEPT AS SET FORTH IN ATMEL’S TERMS AND CONDITIONS OF SALE LOCATED ON ATMEL’S WEB SITE, ATMEL ASSUMES NO LIABILITY WHATSOEVER AND DISCLAIMS ANY EXPRESS, IMPLIED OR STATUTORY WARRANTY RELATING TO ITS PRODUCTS INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT, CONSEQUENTIAL, PUNITIVE, SPECIAL OR INCIDENTAL DAMAGES (INCLUDING, WITHOUT LIMITATION, DAMAGES FOR LOSS OF PROFITS, BUSINESS INTERRUPTION, OR LOSS OF INFORMATION) ARISING OUT OF THE USE OR INABILITY TO USE THIS DOCUMENT, EVEN IF ATMEL HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. Atmel makes no representations or warranties with respect to the accuracy or completeness of the contents of this document and reserves the right to make changes to specifications and product descriptions at any time without notice. Atmel does not make any commitment to update the information contained herein. Unless specifically provided otherwise, Atmel products are not suitable for, and shall not be used in, automotive applications. Atmel’s products are not intended, authorized, or warranted for use as components in applications intended to support or sustain life. © 2008 Atmel Corporation. All rights reserved. Atmel ®, logo and combinations thereof, and others are registered trademarks or trademarks of Atmel Corporation or its subsidiaries. Other terms and product names may be trademarks of others. 7776E–AERO–06/08