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參數(shù)資料
| 型號(hào)： | M27C256B-90XB1 |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | PROM |
| 英文描述： | 32K X 8 OTPROM, 90 ns, PDIP28 |
| 封裝： | 0.600 INCH, LEAD FREE, PLASTIC, DIP-28 |
| 文件頁數(shù)： | 3/24頁 |
| 文件大?。?/td> | 205K |
| 代理商： | M27C256B-90XB1 |
M27C256B
Device operation
2.10
Erasure operation (applies for UV EPROM)
The erasure characteristics of the M27C256B is such that erasure begins when the cells are
exposed to light with wavelengths shorter than approximately 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 fluorescent lighting could
erase a typical M27C256B in about 3 years, while it would take approximately 1 week to
cause erasure when exposed to direct sunlight. If the M27C256B 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 M27C256B window to prevent unintentional erasure. The recommended
erasure procedure for the M27C256B is exposure to short wave ultraviolet light which has
wavelength 2537. 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 dosage is approximately
15 to 20 minutes using an ultraviolet lamp with 12000 W/cm2 power rating. The M27C256B
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.
Table 2.
Operating modes(1)
1.
X = VIH or VIL, VID = 12V ± 0.5V.
Mode
E
G
A9
VPP
Q7-Q0
Read
VIL
XVCC
Data Out
Output Disable
VIL
VIH
XVCC
Hi-Z
Program
VIL Pulse
VIH
XVPP
Data In
Verify
VIH
VIL
XVPP
Data Out
Program Inhibit
VIH
XVPP
Hi-Z
Standby
VIH
XX
VCC
Hi-Z
Electronic Signature
VIL
VID
VCC
Codes
Table 3.
Electronic signature
Identifier
A0
Q7
Q6
Q5
Q4
Q3
Q2
Q1
Q0
Hex Data
Manufacturer’s
Code
VIL
00
10
00
20h
Device Code
VIH
10
00
11
01
8Dh
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PDF描述 |
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| M27C256B-80F3 | 32K X 8 UVPROM, 80 ns, CDIP28 |
| M27C256B-45C1TR | 32K X 8 OTPROM, 45 ns, PQCC32 |
| M27C256B-15C3TR | 32K X 8 OTPROM, 150 ns, PQCC32 |
| M27C256B-15XB6 | 32K X 8 OTPROM, 150 ns, PDIP28 |
| M27C512-45XN1 | 512 Kbit (64K x8) UV EPROM and OTP EPROM |
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| M27C322-100F1 | 功能描述:可擦除可編程ROM 32M (2Mx16) 100ns RoHS:否 制造商:Maxim Integrated 類型: 存儲(chǔ)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 |
| M27C322-100S1 | 功能描述:可擦除可編程ROM 32M (2Mx16) 100ns RoHS:否 制造商:Maxim Integrated 類型: 存儲(chǔ)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 |
| M27C4001-10B1 | 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(chǔ)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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