M27C4002-15F1 STMicroelectronics, M27C4002-15F1 Datasheet - Page 11

• Manufacturer Part Number: M27C4002-15F1
• Description: IC EPROM 4MBIT 150NS 40FDIP
• Manufacturer: STMicroelectronics

Specifications of M27C4002-15F1

• Format - Memory: EPROMs
• Memory Type: UV EPROM
• Memory Size: 4M (256K x 16)
• Speed: 150ns
• Interface: Parallel
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 40-CDIP (0.600", 15.24mm) Window
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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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