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M27256-20F1 Datasheet(PDF) 2 Page - STMicroelectronics

Part # M27256-20F1
Description  NMOS 256K 32K x 8 UV EPROM
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M27256-20F1 Datasheet(HTML) 2 Page - STMicroelectronics

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A1
A0
Q0
A7
A4
A3
A2
A6
A5
A13
A10
A8
A9
Q7
A14
A11
G
E
Q5
Q1
Q2
Q3
VSS
Q4
Q6
A12
VPP
VCC
AI00768
M27256
8
1
2
3
4
5
6
7
9
10
11
12
13
14
16
15
28
27
26
25
24
23
22
21
20
19
18
17
Figure 2. DIP Pin Connections
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 6.25
V
VCC
Supply Voltage
–0.6 to 6.25
V
VA9
VA9 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 ex tended periods
may affect device reliability. Refer also to the STMicroelectronics SURE Program and other relevant quality documents.
Table 2. Absolute Maximum Ratings
DEVICE OPERATION
The eight modes of operations of the M27256 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 M27256 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 ad-
dresses have been stable for at least tAVQV-tGLQV.
Standby Mode
The M27256 has a standby mode which reduces
the maximum active power current from 100mA to
40mA. The M27256 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, 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.
M27256
2/10


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