VA87C196KC 데이터 시트보기 (PDF) - Intel

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VA87C196KC

16-BIT HIGH-PERFORMANCE CHMOS MICROCONTROLLERS WITH ON-CHIP EPROM

Intel 

M87C196KC M87C196KD

Erasing the M87C196KC KD EPROM

Initially and after each erasure all bits of the

M87C196KC KD 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 M87C196KC KD

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 M87C196KC KD in approximately

3 years while it would take approximately 1 week to

cause erasure when exposed to direct sunlight

If the M87C196KC KD 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

M87C196KC KD is exposure to shortwave ultravio-

let light which has a wavelength of 2537 The inte-

grated dose (i e UV intensity c exposure time)

for erasure should be a minimum of 15 Wsec cm2

The erasure time with this dosage is approximately

35 to 60 minutes using an ultraviolet lamp with a

12000 mW cm2 power rating The M87C196KC KD

should be placed within 1 inch of the lamp tubes

during erasure The maximum integrated dose an

M87C196KC KD can be exposed to without dam-

age is 7258 Wsec cm2 (1 week 12000 mW cm2)

Exposure of the M87C196KC KD 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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