ST92196A STMicroelectronics, ST92196A Datasheet - Page 262

• Manufacturer Part Number: ST92196A
• Description: 8/16-bit Mcu For Tv Applications With Up To 96k Rom, On-screen-display And 1 Or 2 Data Slicers
• Manufacturer: STMicroelectronics

3 EPROM/OTP PROGRAMMING
The
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-
EPROM/OTP
of the ST92E196A/B &
ST92E196A/B & ST92T196A/B EPROM/OTP PROGRAMMING
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.
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