M2764A-2F1 STMicroelectronics, M2764A-2F1 Datasheet - Page 8

• Manufacturer Part Number: M2764A-2F1
• Manufacturer: STMicroelectronics

Specifications of M2764A-2F1

• Organization: 8Kx8
• Interface Type: Parallel
• In System Programmable: In System/External
• Access Time (max): 200ns
• Package Type: CFDIPWA
• Reprogramming Technique: UV
• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (min): 4.5V
• Operating Supply Voltage (max): 5.5V
• Supply Current: 75mA
• Pin Count: 28
• Mounting: Through Hole
• Operating Temp Range: 0C to 70C
• Operating Temperature Classification: Commercial
• Lead Free Status / Rohs Status: Compliant

M2764A
Program Verify
A verify should be performed on the programmed
bits to determine that they were correctly pro-
grammed. The verify is accomplished with G = V
E = V
Electronic Signature
The Electronic Signature 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.
This mode is functional in the 25 C 5 C ambient
temperature range that is required when program-
ming the M2764A.
To activate this mode, the programming equipment
must force 11.5V to 12.5V on address line A9 of the
M2764A. Two identifier bytes may then be se-
quenced from the device outputs by toggling ad-
dress line A0 from V
must be held at V
mode. Byte 0 (A0 = V
turer code and byte 1 (A0 = V
code. For the SGS-THOMSON M2764A, these two
identifier bytes are given below.
ORDERING INFORMATION SCHEME
For a list of available options (Speed, V
catalogue.
For further information on any aspect of this device, please contact SGS-THOMSON Sales Office nearest
to you.
8/10
IL
, P = V
IH
blank
-20
-25
and V
Example:
-1
-2
-3
-4
Speed and V
IL
IL
to V
during Electronic Signature
PP
IL
) represents the manufac-
180 ns, 5V 5%
200 ns, 5V 5%
250 ns, 5V 5%
300 ns, 5V 5%
450 ns, 5V 5%
200 ns, 5V 10%
250 ns, 5V 10%
= 12.5V.
IH
. All other address lines
IH
CC
) the device identifier
Tolerance
CC
M2764A
Tolerance, Package, etc...) refer to the current Memory Shortform
IL
,
F
-1
ERASURE OPERATION (applies to UV EPPROM)
The erasure characteristic of the M2764A 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 M2764A in about 3 years, while it
would take approximately 1 week to cause erasure
when exposed to direct sunlight. If the M2764A 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 M2764A window to
prevent unintentional erasure. The recommended
erasure procedure for the M2764A 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
is approximately 15 to 20 minutes using an ultra-
violet lamp with 12000 W/cm
M2764A 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 re-
moved before erasure.
Package
FDIP28W
F
1
2
. The erasure time with this dosage
Temperature Range
1
6
0 to 70
–40 to 85 C
2
power rating. The