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M27C4002-15F1TR Datasheet(PDF) 11 Page - STMicroelectronics

No. de pieza M27C4002-15F1TR
Descripción Electrónicos  4 Mbit (256Kb x16) UV EPROM and OTP EPROM
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M27C4002-15F1TR Datasheet(HTML) 11 Page - STMicroelectronics

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M27C4002
Device operation
11/24
M27C4002, these two identifier bytes are given in Table 3: Electronic Signature and can be
read-out on outputs Q7 to Q0.
2.10
Erasure operation (applies to UV EPROM)
The erasure characteristics of the M27C4002 are 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 M27C4002 in about 3 years, while it would take approximately 1 week to
cause erasure when exposed to direct sunlight. If the M27C4002 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 M27C4002 window to prevent unintentional erasure. The recommended
erasure procedure for the M27C4002 is exposure to short wave ultraviolet light which has
wavelength 2537 Å. 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 M27C4002
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.
Table 2.
Operating modes(1)
1.
X = VIH or VIL, VID = 12V ± 0.5V.
Mode
E
G
A9
VPP
Q15-Q0
Read
VIL
VIL
XVCC or VSS
Data Out
Output Disable
VIL
VIH
XVCC or VSS
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 or VSS
Hi-Z
Electronic Signature
VIL
VIL
VID
VCC
Codes
Table 3.
Electronic Signature(1)
1.
Outputs Q15-Q8 are set to '0'.
Identifier
A0
Q7
Q6
Q5
Q4
Q3
Q2
Q1
Q0
Hex Data
Manufacturer’s
Code
VIL
00100000
20h
Device Code
VIH
01000100
44h


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