M27V160-100XF1 STMicroelectronics, M27V160-100XF1 Datasheet - Page 11

• Manufacturer Part Number: M27V160-100XF1
• Description: IC EPROM 16MBIT 100NS 42CDIP
• Manufacturer: STMicroelectronics

Specifications of M27V160-100XF1

• Format - Memory: EPROMs
• Memory Type: UV EPROM
• Memory Size: 16M (2M x 8 or 1M x 16)
• Speed: 100ns
• Interface: Parallel
• Voltage - Supply: 3.14 V ~ 3.47 V
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 42-CDIP (0.600", 15.24mm) Window
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

M27V160
2.9
2.10
Electronic Signature
Erasure operation (applies to UV EPROM)
The Electronic Signature (ES) mode allows the reading out of a binary code from an
EPROM that will identify its manufacturer and type. This mode is intended for use by
programming equipment to automatically match the device to be programmed with its
corresponding programming algorithm. The ES mode is functional in the 25°C ± 5°C
ambient temperature range that is required when programming the M27V160. To activate
the ES mode, the programming equipment must force 11.5V to 12.5V on address line A9 of
the M27V160, with V
Two identifier bytes may then be sequenced from the device outputs by toggling address line
A0 from V
mode.
Byte 0 (A0 = V
identifier code. For the STMicroelectronics M27V160, these two identifier bytes are given in
Table 3
have the same identifier bytes.
Table 3.
The erasure characteristics of the M27V160 is 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 M27V160 in about 3 years, while it would take approximately 1 week to
cause erasure when exposed to direct sunlight. If the M27V160 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 M27V160 window to prevent unintentional erasure. The recommended
erasure procedure for M27V160 is exposure to short wave ultraviolet light which has a
wavelength of 2537 Å. The integrated dose (i.e. UV intensity x exposure time) for erasure
should be a minimum of 30 W-sec/cm
30 to 40 minutes using an ultraviolet lamp with 12000 µW/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.
Manufacturer’s Code
Device Code
Identifier
and can be read-out on outputs Q7 to Q0. Note that the M27V160 and M27C160
IL
to V
Electronic Signature
IL
) represents the manufacturer code and byte 1 (A0 = V
IH
. All other address lines must be held at V
PP
= V
V
A0
V
IH
IL
CC
Q15
and
= 5V.
Q7
0
1
Q14
and
Q6
2
0
0
. The erasure time with this dosage is approximately
Q13
and
Q5
1
1
Q12
and
Q4
0
1
Q11
and
Q3
0
0
IL
2
during Electronic Signature
power rating. The M27V160
Q10
and
Q2
0
0
and
Q9
Q1
IH
0
0
Device description
) the device
and
Q8
Q0
0
1
Data
Hex
B1h
20h
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