參數(shù)資料
型號(hào): M27W401-100B6TR
廠商: 意法半導(dǎo)體
英文描述: 4 Mbit 512Kb x 8 Low Voltage UV EPROM and OTP EPROM
中文描述: 4兆位512KB的× 8低壓紫外線可擦寫可編程只讀存儲(chǔ)器和OTP存儲(chǔ)器
文件頁(yè)數(shù): 9/15頁(yè)
文件大小: 102K
代理商: M27W401-100B6TR
9/15
M27W401
ERASURE OPERATION(appliesto UV EPROM)
The erasure characteristics of the M27W401 are
such that erasure begins when the cells are ex-
posed to light with wavelengths shorter than ap-
proximately 4000 . It should be noted that
sunlight and some type of fluorescent lamps have
wavelengths in the 3000-4000 range. Data
shows that constant exposure to room level fluo-
rescent lighting could erase a typical M27W401 in
about 3 years, while it would takeapproximately 1
week to cause erasure when exposed to direct
sunlight. If the M27W401 is to beexposed tothese
types of lighting conditions for extended periods of
time, it is suggested that opaque labelsbeput over
the M27W401 window to prevent unintentional
erasure. The recommended erasure procedure for
the M27W401is exposureto shortwave ultraviolet
light which has wavelength of 2537 . The inte-
grated dose (i.e. UV intensity x exposure time) for
erasure should be a minimum of 15 W-sec/cm
2
.
The erasure time with this dosage is approximate-
ly 15 to 20 minutes using an ultraviolet lamp with
12000
μ
W/cm
2
power rating. The M27W401
should be placed within 2.5 cm (1inch) of the lamp
tubes during the erasure. Somelamps have a filter
on their tubes which should be removed before
erasure.
On-Board Programming
The M27W401 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 matchthe device to be programmed
with its corresponding programming algorithm.
The ES mode is functional in the 25
°
C
±
5
°
C am-
bient temperaturerange that is required when pro-
gramming the M27W401. To activate the ES
mode, the programming equipment must force
11.5V to 12.5V on address line A9 of the
M27W401 with V
PP
= V
CC
= 5V. Two identifier
bytes maythen be sequenced fromthe device out-
puts bytoggling address line A0from V
IL
toV
IH
. All
other address lines must be held at V
IL
during
Electronic Signature mode. Byte 0 (A0 = V
IL
) rep-
resents the manufacturer code and byte 1
(A0 = V
IH
) the device identifier code. For the
STMicroelectronics M27W401,these two identifier
bytes are given in Table 4 and can be read-out on
outputs Q7 to Q0. Note that the M27W401 and
M27C4001 have the same identifier bytes.
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