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參數(shù)資料
| 型號： | M27C202-70N6TR |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | 2 Mbit 128Kb x16 UV EPROM and OTP EPROM |
| 中文描述： | 2兆位存儲器128KB的x16紫外線和OTP存儲器 |
| 文件頁數(shù)： | 9/15頁 |
| 文件大小： | 102K |
| 代理商： | M27C202-70N6TR |
9/15
M27C202
On-Board Programming
The M27C202 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 M27C202. To activate the ES
mode, the programming equipment must force
11.5V to12.5V onaddress line A9 of the M27C202
with V
PP
= V
CC
= 5V. Two identifier bytes may
then be sequencedfromthe device outputs bytog-
gling address line A0 from V
IL
to V
IH
. All other ad-
dress lines must be held at V
IL
during Electronic
Signature mode. Byte 0 (A0 = V
IL
) represents the
manufacturer code and byte 1 (A0 = V
IH
) the de-
vice identifier code. For the STMicroelectronics
M27C202, these two identifier bytes are given in
Table 4 and canbe read-out on outputs Q7 to Q0.
ERASURE OPERATION (applies to UV EPROM)
The erasure characteristics of the M27C202 is
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. Research
shows that constant exposure to room level fluo-
rescent lighting could erase a typical M27C202 in
about 3 years, while it would takeapproximately 1
week to cause erasure when exposed to direct
sunlight. If the M27C202 is to be exposed to these
types of lighting conditions for extended periods of
time, it is suggested that opaque labelsbeput over
the M27C202 windowto prevent unintentionalera-
sure. The recommended erasure procedure for
the M27C202 is exposure to short wave ultraviolet
light which haswavelength 2537 . The integrated
dose (i.e. UV intensityx exposure time) for erasure
should be a minimum of 15 W-sec/cm
2
. The era-
sure time with this dosage is approximately 15 to
20
minutes
using
an
12000
μ
W/cm
2
power rating. TheM27C202 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 era-
sure.
ultraviolet
lamp
with
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PDF描述 |
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| M27C257 | ADDRESS LATCHED 256K (32K x 8) UV EPROM and OTP EPROM |
| M27C320-80M1 | 32 Mbit 4Mb x8 or 2Mb x16 OTP EPROM |
| M27C320-120M1 | 32 Mbit 4Mb x8 or 2Mb x16 OTP EPROM |
| M27C320-100N1 | 32 Mbit 4Mb x8 or 2Mb x16 OTP EPROM |
| M27C320 | 32 Mbit 4Mb x8 or 2Mb x16 OTP EPROM |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M27C256-12F6 | 制造商:STMicroelectronics 功能描述: |
| M27C256B012F1 | 制造商:STMicroelectronics 功能描述: |
| M27C256B-10B6 | 功能描述:可擦除可編程ROM 256K (32KX8) 100ns RoHS:否 制造商:Maxim Integrated 類型: 存儲容量:1024 bit 組織:1 K x 1 接口類型: 工作電流:5 uA 編程電壓: 工作電源電壓:2.8 V to 6 V 最大工作溫度:+ 85 C 安裝風(fēng)格:Through Hole 封裝 / 箱體:TO-92 |
| M27C256B-10C1 | 功能描述:可擦除可編程ROM 256K (32KX8) 100ns RoHS:否 制造商:Maxim Integrated 類型: 存儲容量:1024 bit 組織:1 K x 1 接口類型: 工作電流:5 uA 編程電壓: 工作電源電壓:2.8 V to 6 V 最大工作溫度:+ 85 C 安裝風(fēng)格:Through Hole 封裝 / 箱體:TO-92 |
| M27C256B10C6 | 制造商:STMicroelectronics 功能描述:EPROM OTP 256K-Bit 32K x 8 100ns 32-Pin PLCC Tube |
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