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M27C2001-15XN1X 데이터시트(PDF) 9 Page - STMicroelectronics

부품명 M27C2001-15XN1X
상세설명  2 Mbit (256Kb x 8) UV EPROM and OTP EPROM
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
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M27C2001
On-Board Programming
The M27C2001 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 M27C2001. To activate the ES
mode, the programming equipment must force
11.5V to 12.5V on address line A9 of the
M27C2001 with VPP=VCC=5V. Two identifier
bytes may then be sequenced from the device out-
puts 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) repre-
sents the manufacturer code and byte 1 (A0=VIH)
the device identifier code. For the STMicroelec-
tronics M27C2001, these two identifier bytes are
given in Table 4 and can be read-out on outputs
Q0 to Q7.
ERASURE OPERATION (applies to UV EPROM)
The erasure characteristics of the M27C2001 are
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. Data
shows that constant exposure to room level fluo-
rescent lighting could erase a typical M27C2001 in
about 3 years, while it would take approximately 1
week to cause erasure when exposed to direct
sunlight. If the M27C2001 is to be exposed to
these types of lighting conditions for extended pe-
riods of time, it is suggested that opaque labels be
put over the M27C2001 window to prevent unin-
tentional erasure. The recommended erasure pro-
cedure for the M27C2001 is exposure to short
wave ultraviolet light which has wavelength of
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 dos-
age is approximately 15 to 20 minutes using an ul-
traviolet lamp with 12000
µW/cm2 power rating.
The M27C2001 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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