Write and verify program
Bake with power off
125°C to 150°C,
24 Hr to 48 Hr
Read and check program
Install
Figure 18.7 Recommended Screening Procedure
If a series of write errors occurs while the same PROM programmer is in use, stop programming
and check the PROM programmer and socket adapter for defects, using a microcontroller with on-
chip EPROM in a windowed package, for instance.
Please inform Hitachi of any abnormal conditions noted during programming or in screening of
program data after high-temperature baking.
18.3.4
Erasing Data
Data is erased by exposing the transparent window in the package to ultraviolet light. The erase
conditions are shown in table 18.7.
Table 18.7 Erase Conditions
Item
Value
Ultraviolet wavelength
Minimum irradiation
253.7nm
15W • s/cm2
The erase conditions in table 18.7 can be met by exposure to a 12000 µW/cm2 ultraviolet lamp
positioned 2 to 3 cm directly above the chip for approximately 20 minutes.
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RENESAS [ RENESAS TECHNOLOGY CORP ]
