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HD6433644R Datasheet(PDF) 130 Page - Renesas Technology Corp |
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HD6433644R Datasheet(HTML) 130 Page - Renesas Technology Corp |
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130 / 549 page  Section 6 ROM Rev. 6.00 Sep 12, 2006 page 110 of 526 REJ09B0326-0600 • Avoid touching the socket adapter or chip while programming, since this may cause contact faults and write errors. 6.3.3 Reliability of Programmed Data A highly effective way to improve data retention characteristics is to bake the programmed chips at 150°C, then screen them for data errors. This procedure quickly eliminates chips with PROM memory cells prone to early failure. Figure 6.5 shows the recommended screening procedure. Program chip and verify programmed data Bake chip for 24 to 48 hours at 125 C to 150 C with power off Read and check program Install Figure 6.5 Recommended Screening Procedure If a group of programming errors occurs while the same PROM programmer is in use, stop programming and check the PROM programmer and socket adapter for defects, using a microcomputer with on-chip EPROM in a windowed package, etc. Please inform Renesas Technology of any abnormal conditions noted during or after programming or in screening of program data after high-temperature baking. |
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