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M27C256B-60C1TR Scheda tecnica(PDF) 11 Page - STMicroelectronics

Il numero della parte M27C256B-60C1TR
Spiegazioni elettronici  256 Kbit (32Kb 횞 8) UV EPROM and OTP EPROM
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

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M27C256B
Device operation
11/24
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 Å. It should be noted
that sunlight and some type of fluorescent lamps have wavelengths in the 3000-4000 Å
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 2537Å. 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 µW/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
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
VIH
XVPP
Hi-Z
Standby
VIH
XX
VCC
Hi-Z
Electronic Signature
VIL
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
00
20h
Device Code
VIH
10
00
11
01
8Dh


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