M27256-F6 STMICROELECTRONICS [STMicroelectronics], M27256-F6 Datasheet - Page 2

• Manufacturer Part Number: M27256-F6
• Description: NMOS 256K 32K x 8 UV EPROM
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

Table 2. Absolute Maximum Ratings
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.
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 V
for Electronic Signature.
Figure 2. DIP Pin Connections
M27256
2/10
Symbol
T
T
V
V
V
V
T
BIAS
STG
CC
PP
IO
A9
A
V PP
V SS
A12
Q0
Q1
Q2
A7
A6
A5
A4
A3
A2
A1
A0
Ambient Operating Temperature
Temperature Under Bias
Storage Temperature
Input or Output Voltages
Supply Voltage
VA9 Voltage
Program Supply
1
2
3
4
5
6
7
8
9
10
11
12
13
14
M27256
AI00768
28
27
26
25
24
23
22
21
20
19
18
17
16
15
PP
Parameter
V CC
A14
A13
A8
A9
A11
G
A10
E
Q7
Q6
Q5
Q4
Q3
and 12V on A9
grade 6
grade 1
grade 6
grade 1
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 (t
is equal to the delay from E to output (t
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 t
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.
–0.6 to 6.25
–0.6 to 6.25
–0.6 to 13.5
–0.6 to 14
–40 to 85
–10 to 80
–50 to 95
–65 to 125
0 to 70
Value
AVQV
ELQV
Unit
V
V
V
V
C
C
C
-t
). Data
GLQV
AVQV
.
)