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M27C4001-90B6 Datasheet(PDF) 11 Page - STMicroelectronics

No. de pieza M27C4001-90B6
Descripción Electrónicos  4 Mbit (512Kb x 8) UV EPROM and OTP EPROM
Download  24 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M27C4001-90B6 Datasheet(HTML) 11 Page - STMicroelectronics

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M27C4001
Device operation
11/25
2.10
Erasure operation (applies to UV EPROM)
The erasure characteristics of the M27C4001 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. Data shows that constant exposure to room level fluorescent lighting could erase a
typical M27C4001 in about 3 years, while it would take approximately 1 week to cause
erasure when exposed to direct sunlight. If the M27C4001 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 M27C4001 window to prevent unintentional erasure. The recommended erasure
procedure for the M27C4001 is exposure to short wave ultraviolet light which has
wavelength of 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 M27C4001
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 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
Identifier
A0
Q7
Q6
Q5
Q4
Q3
Q2
Q1
Q0
Hex Data
Manufacturer’s
Code
VIL
0
010
00
00
20h
Electronic
Signature
VIH
0
100
00
01
41h


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