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STMicroelectronics Electronic Components Datasheet

M2764A Datasheet

NMOS 64K 8K x 8 UV EPROM

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M2764A
NMOS 64K (8K x 8) UV EPROM
FAST ACCESS TIME: 180ns
EXTENDED TEMPERATURE RANGE
SINGLE 5V SUPPLY VOLTAGE
LOW STANDBY CURRENT: 35mA max
TTLCOMPATIBLE DURING READ and PROGRAM
FAST PROGRAMMING ALGORITHM
ELECTRONIC SIGNATURE
PROGRAMMING VOLTAGE: 12V
28
1
FDIP28W (F)
DESCRIPTION
The M2764A is a 65,536 bit UV erasable and
electrically programmable memory EPROM. It is
organized as 8,192 words by 8 bits.
The M27C64A is housed in a 28 pin Window Ce-
ramic Frit-Seal Dual-in-Line package. The trans-
parent lid allows the user to expose the chip to
ultraviolet light to erase the bit pattern. A new
pattern can then be written to the device by follow-
ing the programming procedure.
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 M2764A
E
G
VSS
AI00776B
March 1995
1/10


STMicroelectronics Electronic Components Datasheet

M2764A Datasheet

NMOS 64K 8K x 8 UV EPROM

No Preview Available !

M2764A
Table 2. Absolute Maximum Ratings
Symbol
Parameter
Value
Unit
TA Ambient Operating Temperature
grade 1
grade 6
0 to 70
–40 to 85
°C
TBIAS
Temperature Under Bias
grade 1
grade 6
–10 to 80
–50 to 95
°C
TSTG
Storage Temperature
–65 to 125
°C
VIO Input or Output Voltages
–0.6 to 6.5
V
VCC Supply Voltage
–0.6 to 6.5
V
VA9 A9 Voltage
–0.6 to 13.5
V
VPP Program Supply
–0.6 to 14
V
Note: Except for the rating "Operating Temperature Range", stresses above those listed in the Table "Absolute Maximum Ratings" may cause
permanent damage to the device. These are stress ratings only and operation of the device at these or any other conditions above those
indicated in the Operating sections of this specification is not implied. Exposure to Absolute Maximum Rating conditions for extended periods
may affect device reliability. Refer also to the SGS-THOMSON SURE Program and other relevant quality documents.
Figure 2. DIP Pin Connections
VPP 1
A12 2
28 VCC
27 P
A7 3
26 NC
A6 4
25 A8
A5 5
24 A9
A4 6
23 A11
A3 7
22 G
M2764A
A2 8
21 A10
A1 9
20 E
A0 10
19 Q7
Q0 11
18 Q6
Q1 12
17 Q5
Q2 13
16 Q4
VSS 14
15 Q3
AI00777
Warning: NC = Not Connected.
DEVICE OPERATION
The seven modes of operations of the M2764A are
listed in the Operating Modes table. A single 5V
power supply is required in the read mode. All
inputs are TTL levels except for VPP and 12V on A9
for Electronic Signature.
Read Mode
The M2764A has two control functions, both of
which must be logically satisfied in order to obtain
data at the outputs. Chip Enable (E) is the power
control and should be used for device selection.
Output Enable (G) is the output control and should
be used to gate data to the output pins, inde-
pendent of device selection.
Assuming that the addresses are stable, address
access time (tAVQV) is equal to the delay from E to
output (tELQV). Data is available at the outputs after
the falling edge of G, assuming that E has been low
and the addresses have been stable for at least
tAVQV-tGLQV.
Standby Mode
The M2764A has a standby mode which reduces
the maximum active power current from 75mA to
35mA. The M2764A is placed in the standby mode
by applying a TTL high signal to the E input. When
in the standby mode, the outputs are in a high
impedance state, independent of the G input.
Two Line Output Control
Because EPROMs are usually used in larger mem-
ory arrays, the product features a 2 line control
function which accommodates the use of multiple
memory connection. The two line control function
allows :
a. the lowest possible memory power dissipation,
b. complete assurance that output bus contention
will not occur.
2/10


Part Number M2764A
Description NMOS 64K 8K x 8 UV EPROM
Maker STMicroelectronics
Total Page 10 Pages
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