M27C4001-12C1 STMicroelectronics, M27C4001-12C1 Datasheet - Page 11

• Manufacturer Part Number: M27C4001-12C1
• Description: IC OTP 4MBIT 120NS 32PLCC
• Manufacturer: STMicroelectronics

Specifications of M27C4001-12C1

• Format - Memory: EPROMs
• Memory Type: OTP EPROM
• Memory Size: 4M (512K x 8)
• Speed: 120ns
• Interface: Parallel
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 32-PLCC
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 497-1660-5

M27C4001
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/cm
15 to 20 minutes using an ultraviolet lamp with 12000 W/cm
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.
1. X = V
Table 3.
Read
Output Disable
Program
Verify
Program Inhibit
Standby
Electronic Signature
Manufacturer’s
Code
Electronic
Signature
Identifier
IH
Mode
or V
IL
Operating Modes
Electronic Signature
, V
ID
= 12V ± 0.5V.
V
A0
V
IH
IL
V
IL
V
V
V
V
V
V
Pulse
E
IH
IH
IH
IL
IL
IL
Q7
0
0
(1)
Q6
0
1
2
. The erasure time with this dosage is approximately
V
V
V
V
V
V
G
X
Q5
IH
IH
IH
IL
IL
IL
1
0
Q4
0
0
V
A9
Q3
X
X
X
X
X
X
0
0
ID
2
Q2
power rating. The M27C4001
0
0
V
V
V
CC
CC
CC
V
V
V
V
V
Q1
0
0
or V
or V
or V
CC
PP
PP
PP
pp
SS
SS
SS
Device operation
Q0
0
1
Data Out
Data Out
Q7 - Q0
Data In
Codes
Hex Data
Hi-Z
Hi-Z
Hi-Z
20h
41h
11/25