M27C1001-70B1 ST Microelectronics, M27C1001-70B1 Datasheet - Page 11

• Manufacturer Part Number: M27C1001-70B1
• Manufacturer: ST Microelectronics

Specifications of M27C1001-70B1

• Density: 1Mb
• Organization: 128Kx8
• Bus Type: Parallel
• In System Programmable: External
• Reprogramming Technique: OTP
• Access Time (max): 70ns
• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (min): 4.5V
• Operating Supply Voltage (max): 5.5V
• Supply Current: 50mA
• Package Type: PDIP
• Pin Count: 32
• Mounting: Through Hole
• Operating Temp Range: 0C to 70C
• Operating Temperature Classification: Commercial
• Lead Free Status / Rohs Status: Compliant

M27C1001
2.10
Byte 0 (A0 = V
identifier code. For the STMicroelectronics M27C1001, these two identifier bytes are given
in
Table 3.
Erasure operation (applies to UV EPROM)
The erasure characteristics of the M27C1001 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 M27C1001 in about 3 years, while it would take approximately 1 week to
cause erasure when exposed to direct sunlight. If the M27C1001 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 M27C1001 window to prevent unintentional erasure. The recommended
erasure procedure for the M27C1001 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 15 W-sec/cm
15 to 20 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
Table 3
Identifier
and can be read-out on outputs Q7 to Q0.
Electronic Signature
IL
) represents the manufacturer code and byte 1 (A0 = V
V
A0
V
IH
IL
Q7
0
0
Q6
0
0
2
. The erasure time with this dosage is approximately
Q5
1
0
Q4
0
0
Q3
0
0
2
power rating. The M27C1001
Q2
0
1
Q1
0
0
IH
Device description
) the device
Q0
0
1
Hex Data
20h
05h
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