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參數(shù)資料
| 型號： | M27C322-80F6 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | 32 Mbit 2Mb x16 UV EPROM and OTP EPROM |
| 中文描述： | 32兆位存儲器的2Mb x16紫外線和OTP存儲器 |
| 文件頁數(shù)： | 9/13頁 |
| 文件大小： | 112K |
| 代理商： | M27C322-80F6 |
9/13
M27C322
PRESTO III Programming Algorithm
The PRESTO III Programming Algorithm allows
the whole array to be programed with a guaran-
teed margin in a typical time of 100 seconds. Pro-
gramming with PRESTO III consists of applying a
sequence of 50
μs program pulses to each word
until a correct verify occurs (see Figure 8). During
programing and verify operation a MARGIN
MODE circuit must be activated to guarantee that
each cell is programed with enough margin. No
overprogram pulse is applied since the verify in
MARGIN MODE provides the necessary margin to
each programmed cell.
Program Inhibit
Programming of multiple M27C322s in parallel
with different data is also easily accomplished. Ex-
cept for E, all like inputs including GV
PP
of the par-
allel M27C322 may be common. A TTL low level
pulse applied to a M27C322's E input and V
PP
at
12V, will program that M27C322. A high level E in-
put inhibits the other M27C322s from being pro-
grammed.
Program Verify
A verify (read) should be performed on the pro-
grammed bits to determine that they were correct-
ly programmed. The verify is accomplished with
Figure 8. Programming Flowchart
AI02206
n = 0
Last
Addr
VERIFY
E = 50
μ
s Pulse
++n
= 25
++ Addr
VCC = 6.25V, VPP = 12V
FAIL
CHECK ALL WORDS
1st: VCC = 6V
2nd: VCC = 4.2V
YES
NO
YES
NO
YES
NO
SET MARGIN MODE
RESET MARGIN MODE
GV
PP
at V
IL
. Data should be verified with t
ELQV
af-
ter the falling edge of E.
On-Board Programming
The M27C322 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 M27C322. To activate the ES
mode, the programming equipment must force
11.5V to 12.5V on address line A9 of the
M27C322, with V
PP
= V
CC
= 5V. Two identifier
bytes may then be sequenced from the device out-
puts by toggling address line A0 from V
IL
to V
IH
. All
other address 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 device identifier
code. For the STMicroelectronics M27C322, 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 M27C322 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 M27C322 in
about 3 years, while it would take approximately 1
week to cause erasure when exposed to direct
sunlight. If the M27C322 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 M27C322 window to prevent unintentional era-
sure. The recommended erasure procedure for
M27C322 is exposure to short wave ultraviolet
light which has a wavelength of 2537 . The inte-
grated dose (i.e. UV intensity x exposure time) for
erasure should be a minimum of 30 W-sec/cm
2
.
The erasure time with this dosage is approximate-
ly 30 to 40 minutes using an ultraviolet lamp with
12000 μW/cm
2
power rating. The M27C322
should be placed within 2.5cm (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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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M27C4001-10B1 | 功能描述:可擦除可編程ROM 4M (512Kx8) 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 |
| M27C4001-10B1E | 制造商:STMicroelectronics 功能描述:4 MBIT (512KB X 8) UV EPROM AND OTP EPROM |
| M27C4001-10C1 | 功能描述:可擦除可編程ROM 4M (512Kx8) 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 |
| M27C4001-10C1 | 制造商:STMicroelectronics 功能描述:PROM OTP CMOS 4MB 27C4001 PLCC32 |
| M27C4001-10F1 | 功能描述:可擦除可編程ROM 4M (512Kx8) 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 |
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