MB89160/160A Series
4. Recommended Screening Conditions
High-temperature aging is recommended as the pre-assembly screening procedure for a product with a blanked
OTPROM microcomputer program.
Program, verify
Aging
+150°C, 48 Hrs.
Data verification
Assembly
5. Programming Yield
All bits cannot be programmed at Fujitsu shipping test to a blanked OTPROM microcomputer, due to its nature.
For this reason, a programming yield of 100% cannot be assured at all times.
6. EPROM Programmer Adapter Socket
Package
FPT-80P-M05
FPT-80P-M06
FPT-80P-M11
Compatible adapter socket
ROM-80SQF-28DP-8L
ROM-80QF-28DP-8L3
ROM-80QF2-28DP-8L2
7. Erasure
In order to clear all locations of their programmed contents, it is necessary to expose the internal EPROM to an
ultraviolet light source. A dosage of 10 W-seconds/cm2 is required to completely erase an internal EPROM. This
dosage can be obtained by exposure to an ultraviolet lamp (wavelength of 2537 Angstroms (Å)) with intensity
of 12000 µW/cm2 for 15 to 21 minutes. The internal EPROM should be about one inch from the source and all
filters should be removed from the UV light source prior to erasure.
It is important to note that the internal EPROM and similar devices, will erase with light sources having
wavelengths shorter than 4000Å. Although erasure time will be much longer than with UV source at 2537Å,
nevertheless the exposure to fluorescent light and sunlight will eventually erase the internal EPROM, and
exposure to them should be prevented to realize maximum system reliability. If used in such an environment,
the package windows should be covered by an opaque label or substance.
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