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M87C196KD Datasheet(Hoja de datos) 17 Page - Intel Corporation

No. de Pieza. M87C196KD
Descripción  16-BIT HIGH-PERFORMANCE CHMOS MICROCONTROLLERS WITH ON-CHIP EPROM
Descarga  23 Pages
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Fabricante  INTEL [Intel Corporation]
Página de inicio  http://www.intel.com
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 17 page
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M87C196KCM87C196KD
Erasing the M87C196KCKD EPROM
Initially
and after each erasure
all bits of the
M87C196KCKD are in the ‘‘1’’ state Data is intro-
duced by selectively programming ‘‘0s’’ into the de-
sired bit locations Although only ‘‘0s’’ will be pro-
grammed both ‘‘1s’’ and ‘‘0s’’ can be present in the
data word The only way to change a ‘‘0’’ to a ‘‘1’’ is
by ultraviolet light erasure
The erasure characteristics of the M87C196KCKD
are such that erasure begins to occur upon expo-
sure to light with wavelengths shorter than approxi-
mately 4000 Angstroms ( ) It should be noted that
sunlight and certain types of fluorescent lamps have
wavelengths in the 3000 – 4000
range Constant
exposure to room level fluorescent lighting could
erase the typical M87C196KCKD in approximately
3 years while it would take approximately 1 week to
cause erasure when exposed to direct sunlight
If the M87C196KCKD is to be exposed to light for
extended periods of time opaque labels must be
placed over the EPROM’s window to prevent unin-
tentional erasure
The recommended erasure procedure for the
M87C196KCKD is exposure to shortwave ultravio-
let light which has a wavelength of 2537
The inte-
grated dose (ie
UV intensity c exposure time)
for erasure should be a minimum of 15 Wseccm2
The erasure time with this dosage is approximately
35 to 60 minutes using an ultraviolet lamp with a
12000 mWcm2 power rating The M87C196KCKD
should be placed within 1 inch of the lamp tubes
during erasure The maximum integrated dose an
M87C196KCKD can be exposed to without dam-
age is 7258 Wseccm2 (1 week
12000 mWcm2)
Exposure of the M87C196KCKD to high intensity
UV light for long periods may cause permanent dam-
age
EPROM PROGRAMMING WAVEFORMS
271116 – 30
Figure 14 Slave Programming Mode Data Program Mode with Single Program Pulse
17




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