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PDF ( 数据手册 , 数据表 ) 2764A

零件编号 2764A
描述 64K (8K x 8) UV EPROM and OTP ROM
制造商 STMicroelectronics
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2764A 数据手册, 描述, 功能
M27C64A
64K (8K x 8) UV EPROM and OTP ROM
VERY FAST ACCESS TIME: 150ns
COMPATIBLE with HIGH SPEED
MICROPROCESSORS, ZERO WAIT STATE
LOW POWER “CMOS” CONSUMPTION:
– Active Current 30mA
– Standby Current 100µA
PROGRAMMING VOLTAGE: 12.5V
ELECTRONIC SIGNATURE for AUTOMATED
PROGRAMMING
HIGH SPEED PROGRAMMING
(less than 1 minute)
28
1
FDIP28W (F)
PLCC32 (C)
DESCRIPTION
The M27C64A is a high speed 65,536 bit UV eras-
able and electrically programmable memory
EPROM ideally suited for microprocessor systems
requiring large programs. It is organized as 8,192
by 8 bits.
The 28 pin Window Ceramic Frit-Seal Dual-in-Line
package has transparent lid which allows the user
to expose the chip to ultraviolet light to erase the
bit pattern. Anew pattern can then be written to the
device by following the programming procedure.
For applications where the content is programmed
only on time and erasure is not required, the
M27C64A is offered in Plastic Leaded Chip Carrier
package.
Figure 1. Logic Diagram
VCC VPP
13
A0-A12
8
Q0-Q7
Table 1. Signal Names
A0 - A12
Q0 - Q7
E
G
P
VPP
VCC
VSS
Address Inputs
Data Outputs
Chip Enable
Output Enable
Program
Program Supply
Supply Voltage
Ground
P M27C64A
E
G
VSS
AI00834B
March 1995
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2764A pdf, 数据表
M27C64A
DEVICE OPERATIONS (cont’d)
at 12.5V, will program that M27C64A. A high level
E input inhibits the other M27C64A from being
programmed.
Program Verify
A verify (read) should be performed on the pro-
grammed bits to determine that they were correctly
programmed. The verify is accomplished with E
and G at VIL, P at VIH, VPP at 12.5V and VCC at 6V.
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 M27C64A. To activate this mode, the
programming equipmentmust force11.5V to 12.5V
on address line A9 of the M27C64A, with
VPP=VCC=5V. Two identifier bytes may then be
sequenced from the device outputs by toggling
address line A0 from VIL to VIH. All other address
lines must be held at VIL during Electronic Signa-
ture mode.
Byte 0 (A0=VIL) represents the manufacturer code
and byte 1 (A0=VIH) the device identifier code. For
the SGS-THOMSON M27C64A, these two identi-
fier bytes are given in Table 4 and can be read-out
on outputs Q0 to Q7.
ERASURE OPERATION (applies to UV EPROM)
The erasure characteristics of the M27C64A is
such that erasure begins when the cells are ex-
posed to light with wavelengths shorter than ap-
proximately 4000 Å. It should be noted that sunlight
and some type of fluorescent lamps have wave-
lengths in the 3000-4000 Å range. Research
shows that constant exposure to room level fluo-
rescent lighting could erase a typical M27C64A in
about 3 years, while it would take approximately 1
week to cause erasure when exposed to direct
sunlight. If the M27C64A 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 M27C64Awindow to prevent unintentional era-
sure. The recommended erasure procedure for
the M27C64A is exposure to short wave ultraviolet
light which has a wavelength of 2537 Å. The inte-
grated dose (i.e. UV intensity x exposure time) for
erasure should be a minimum of 15 W-sec/cm2.
The erasure time with this dosage is approximately
15 to 20 minutes using an ultraviolet lamp with
12000 uW/cm2 power rating. The M27C64A should
be placed within 2.5 cm (1 inch) of the lamp tubes
during the erasure. Some lamps have a filter on
their tubeswhich should be removed beforeerasure.
ORDERING INFORMATION SCHEME
Example: M27C64A -15 F 1 TR
Speed
-15 150 ns
-20 200 ns
-25 250 ns
-30 300 ns
Package
F FDIP28W
C PLCC32
Temperature Range
1 0 to 70 °C
6 –40 to 85 °C
Option
X Additional
Burn-in
TR
Tape & Reel
Packing
For a list of available options (Speed, Package, etc...) refer to the current Memory Shortform catalogue.
For further information on any aspect of this device, please contact SGS-THOMSON Sales Office nearest
to you.
8/11














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