upd178p018 Renesas Electronics Corporation., upd178p018 Datasheet - Page 23

• Manufacturer Part Number: upd178p018
• Description: 8-bit Single-chip Microcontroller
• Manufacturer: Renesas Electronics Corporation.

3. PROGRAM ERASURE ( PD178P018AKK-T ONLY)
nm. Normally, irradiate ultraviolet rays of 254-nm wavelength. The amount of exposure required to completely erase
the programmed data is as follows:
filter is provided for a UV lamp, irradiate the ultraviolet rays after removing the filter.
4. OPAQUE FILM ON ERASURE WINDOW ( PD178P018AKK-T ONLY)
internal circuit other than EPROM from misoperating by rays, cover the erasure window with an opaque film when
EPROM contents erasure is not performed.
5. ONE-TIME PROM VERSION SCREENING
because of its structure. It is recommended to perform screening to verify PROM after writing necessary data and
performing high-temperature storage under the condition below.
The PD178P018AKK-T is capable of erasing (FFH) the data written in a program memory and rewriting.
To erase the programmed data, expose the erasure window to light having a wavelength shorter than about 400
• UV intensity x erasure time: 30 W•s/cm
• Erasure time: 40 min. or more (When a UV lamp of 12 000 W/cm
When erasing the contents of the data, set up the UV lamp within 2.5 cm from the erasure window. Further, if a
To protect from an intentional erasure by rays other than that of the lamp for erasing EPROM contents, or to protect
The one-time PROM version ( PD178P018AGC-3B9) cannot be tested completely by NEC before it is shipped,
needed because of deterioration in performance of the UV lamp, soiled erasure window, etc.)
Storage Temperature
2
125 C
or more
Storage Time
24 hours
2
is used. However, a longer time may be
PD178P018A
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