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M2732A Datasheet

NMOS 32K 4K x 8 UV EPROM

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M2732A
NMOS 32K (4K x 8) UV EPROM
FAST ACCESS TIME: 200ns
EXTENDED TEMPERATURE RANGE
SINGLE 5V SUPPLY VOLTAGE
LOW STANDBY CURRENT: 35mA max
INPUTS and OUTPUTS TTL COMPATIBLE
DURING READ and PROGRAM
COMPLETELY STATIC
24
1
FDIP24W (F)
DESCRIPTION
The M2732A is a 32,768 bit UV erasable and
electrically programmable memory EPROM. It is
organized as 4,096 words by 8 bits. The M2732A
with its single 5V power supply and with an access
time of 200 ns, is ideal suited for applications where
fast turn around and pattern experimentation one
important requirements.
The M2732A is honsed in a 24 pin Window Ceramic
Frit-Seal Dual-in-Line package. The transparent lid
allows the user to expose the chip to ultraviolet light
to erase the bit pattern. A new pattern can be then
written to the clerice by following the programming
procedure.
Figure 1. Logic Diagram
VCC
12
A0-A11
8
Q0-Q7
Table 1. Signal Names
A0 - A11
Address Inputs
Q0 - Q7
Data Outputs
E Chip Enable
GVPP
VCC
VSS
Output Enable / Program Supply
Supply Voltage
Ground
E
GVPP
M2732A
VSS
AI00780B
July 1994
1/9


STMicroelectronics Electronic Components Datasheet

M2732A Datasheet

NMOS 32K 4K x 8 UV EPROM

No Preview Available !

M2732A
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
V
VCC Supply Voltage
–0.6 to 6
V
VPP Program Supply Voltage
–0.6 to 22
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
A7 1
A6 2
24 VCC
23 A8
A5 3
22 A9
A4 4
21 A11
A3 5
A2 6
A1 7
20 GVPP
M2732A 19 A10
18 E
A0 8
17 Q7
Q0 9
16 Q6
Q1 10
15 Q5
Q2 11
14 Q4
VSS 12
13 Q3
AI00781
DEVICE OPERATION
The six modes of operation for the M2732A are
listed in the Operating Modes Table. A single 5V
power supply is required in the read mode. All
inputs are TTL level except for VPP.
Read Mode
The M2732A 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 (tAVAQ) 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 M2732A has a standby mode which reduces
the active power current by 70 %, from 125 mA to
35 mA. The M2732A is placed in the standby mode
by applying a TTL high signal to E input. When in
standby mode, the outputs are in a high impedance
state, independent of the GVPP input.
Two Line Output Control
Because M2732A’s are usually used in larger mem-
ory arrays, this 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.
To most efficiently use these two control lines, it is
recommended that E be decoded and used as the
primary device selecting function, while G should
be made a common connection to all devices in the
array and connected to the READ line from the
system control bus.
This ensures that all deselected memory devices
are in their low power standby mode and that the
output pins are only active when data is required
from a particular memory device.
2/9


Part Number M2732A
Description NMOS 32K 4K x 8 UV EPROM
Maker STMicroelectronics
Total Page 9 Pages
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