M27C4002-12C6 STMicroelectronics, M27C4002-12C6 Datasheet - Page 11
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M27C4002-12C6
Manufacturer Part Number
M27C4002-12C6
Description
Manufacturer
STMicroelectronics
Datasheet
1.M27C4002-12C6.pdf
(24 pages)
Specifications of M27C4002-12C6
Density
4Mb
Organization
256Kx16
Interface Type
Parallel
Bus Type
Parallel
In System Programmable
External
Access Time (max)
120ns
Package Type
PLCC
Reprogramming Technique
OTP
Operating Supply Voltage (typ)
5V
Operating Supply Voltage (min)
4.5V
Operating Supply Voltage (max)
5.5V
Supply Current
70mA
Pin Count
44
Mounting
Surface Mount
Operating Temp Range
-40C to 85C
Operating Temperature Classification
Industrial
Lead Free Status / RoHS Status
Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
M27C4002
2.10
M27C4002, these two identifier bytes are given in
read-out on outputs Q7 to Q0.
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/cm
15 to 20 minutes using an ultraviolet lamp with 12000 µW/cm
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.
1. X = V
Table 3.
1. Outputs Q15-Q8 are set to '0'.
Read
Output Disable
Program
Verify
Program Inhibit
Standby
Electronic Signature
Manufacturer’s
Code
Device Code
Identifier
IH
or V
Mode
Operating modes
Electronic Signature
IL
, V
ID
= 12V ± 0.5V.
V
A0
V
IH
IL
Q7
0
0
(1)
V
IL
(1)
V
V
V
Q6
V
V
V
Pulse
0
1
E
IH
IH
IH
IL
IL
IL
2
. The erasure time with this dosage is approximately
Q5
1
0
V
V
V
V
V
V
G
X
IH
IH
IH
IL
IL
IL
Q4
0
0
Table 3: Electronic Signature
Q3
0
0
V
A9
X
X
X
X
X
X
2
ID
power rating. The M27C4002
Q2
0
1
V
V
V
CC
CC
CC
Q1
0
0
V
V
V
V
V
or V
or V
or V
CC
PP
PP
PP
PP
Device operation
SS
SS
SS
Q0
0
0
and can be
Data Out
Data Out
Q15-Q0
Hex Data
Data In
Codes
Hi-Z
Hi-Z
Hi-Z
20h
44h
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