ST92196A datasheet(262/268 Pages) STMICROELECTRONICS

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ST92E196A/B & ST92T196A/B EPROM/OTP PROGRAMMING

3 EPROM/OTP PROGRAMMING

The

EPROM/OTP

the

ST92E196A/B

ST92T196A/B devices may be programmed using

the EPROM programming boards available from

STMicroelectronics.

EPROM Erasing

The EPROM of the windowed package of the

ST92E196A/B can be erased by exposure to Ul-

tra-Violet light.

The erasure characteristic of the ST92E196A/B is

such that erasure begins when the memory is ex-

posed to light with wave lengths shorter than ap-

proximately 4000Å. It should be noted that sunlight

and some types of fluorescent lamps have wave-

lengths in the range 3000-4000 Å. It is recom-

mended to cover the window of the ST92E196A/B

packages by an opaque label to prevent uninten-

tional erasure problems when testing the applica-

tion in such an environment.

The recommended erasure procedure of the

EPROM is the exposure to short wave ultraviolet

light which have a wave-length 2537Å. The inte-

grated dose (i.e. U.V. intensity x exposure time) for

erasure should be a minimum of 15W-sec/cm2.

The erasure time with this dosage is approximate-

ly 30 minutes using an ultraviolet lamp with a

12000 mW/cm2 power rating. The device should

be placed within 2.5 cm (1 inch) of the lamp tubes

during erasure.

ST92196A Datasheet(PDF) 262 Page - STMicroelectronics