15

µPD75P218

4.4

ERASING METHOD

The program data contents of the

µPD75P218KB are erased by lighting ultraviolet ray whose wavelength

is about 250 nm on the window. The minimum amount of radiation exposure required to erase the contents

This corresponds to about 15 to 20 minutes when using a UV lamp on the market (wavelength 254 nm,

Cautions 1. The programmed data contents may also be erased if the uncovered window is exposed to direct

sunlight or a fluorescent light even for several hours. Thus, to protect the data contents, cover

the window with an opaque film.

NEC attaches quality-tested shading film to the UV EPROM products for shipping.

2. For normal EPROM erase, the distance between the light source and the window should be 2.5

cm or less.

Remark The erase time may be prolonged if the UV lamp is old or if the device window is dirty.