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M27W512-80B6TR データシート(PDF) 8 Page - STMicroelectronics

部品番号 M27W512-80B6TR
部品情報  512 Kbit (64K x8) Low Voltage UV EPROM and OTP EPROM
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M27W512-80B6TR データシート(HTML) 8 Page - STMicroelectronics

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M27W512
8/21
quenced from the device outputs by toggling ad-
dress line A0 from VIL to VIH. All other address
lines must be held at VIL during Electronic Signa-
ture mode. Byte 0 (A0 = VIL) represents the man-
ufacturer code and byte 1 (A0 = VIH) the device
identifier
code.
For
the
STMicroelectronics
M27W512, these two identifier bytes are given in
Table 3. and can be read-out on outputs Q7 to Q0.
Note that the M27W512 and M27C512 have the
same identifier byte.
ERASURE OPERATION (APPLIES FOR UV EPROM)
The erasure characteristics of the M27W512 is
such that erasure begins when the cells are ex-
posed to light with wavelengths shorter than ap-
proximately 4000 Å. It should be noted that
sunlight and some type of fluorescent lamps have
wavelengths in the 3000-4000 Å range.
Research shows that constant exposure to room
level fluorescent lighting could erase a typical
M27W512 in about 3 years, while it would take ap-
proximately 1 week to cause erasure when ex-
posed to direct sunlight. If the M27W512 is to be
exposed to these types of lighting conditions for
extended periods of time, it is suggested that
opaque labels be put over the M27W512 window
to prevent unintentional erasure. The recommend-
ed erasure procedure for the M27W512 is expo-
sure to short wave ultraviolet light which has
wavelength 2537 Å. The integrated dose (i.e. UV
intensity x exposure time) for erasure should be a
minimum of 15 W-sec/cm2. The erasure time with
this dosage is approximately 15 to 20 minutes us-
ing an ultraviolet lamp with 12000 µW/cm2 power
rating. The M27W512 should be placed within 2.5
cm (1 inch) of the lamp tubes during the erasure.
Some lamps have a filter on their tubes which
should be removed before erasure.


同様の部品番号 - M27W512-80B6TR

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