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M27V801-150N6TR Scheda tecnica(PDF) 10 Page - STMicroelectronics

Il numero della parte M27V801-150N6TR
Spiegazioni elettronici  8 Mbit 1Mb x8 Low Voltage UV EPROM and OTP EPROM
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M27V801-150N6TR Scheda tecnica(HTML) 10 Page - STMicroelectronics

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M27V801
10/16
On-Board Programming
The M27V801 can be directly programmed in the
application circuit. See the relevant Application
Note AN620.
Electronic Signature
The Electronic Signature (ES) mode allows the
reading out of a binary code from an EPROM that
will identify its manufacturer and type. This mode
is intended for use by programming equipment to
automatically match the device to be programmed
with its corresponding programming algorithm.
The ES mode is functional in the 25
°C ± 5°C am-
bient temperature range that is required when pro-
gramming the M27V801. To activate the ES mode,
the programming equipment must force 11.5V to
12.5V on address line A9 of the M27V801. Two
identifier bytes may then be sequenced from the
device outputs by toggling address line A0 from
VIL to VIH. All other address lines must be held at
VIL during Electronic Signature mode.
Byte 0 (A0=VIL) represents the manufacturer code
and byte 1 (A0=VIH) the device identifier code. For
the STMicroelectronics M27V801, these two iden-
tifier bytes are given in Table 4 and can be read-
out on outputs Q0 to Q7. Note that the M27V801
and M27C801 have the same identifier bytes.
ERASURE OPERATION (applies to UV EPROM)
The erasure characteristics of the M27V801 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
M27V801 in about 3 years, while it would take ap-
proximately 1 week to cause erasure when ex-
posed to direct sunlight. If the M27V801 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 M27V801 window to
prevent unintentional erasure. The recommended
erasure procedure for the M27V801 is exposure 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 30 W-sec/cm2. The erasure time with this dos-
age is approximately 30 to 40 minutes using an ul-
traviolet lamp with 12000
µW/cm2 power rating.
The M27V801 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.


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