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參數(shù)資料
| 型號(hào)： | M27256-F6 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | NMOS 256K 32K x 8 UV EPROM |
| 中文描述： | NMOS管256K 32K的× 8紫外線存儲(chǔ)器 |
| 文件頁數(shù)： | 2/10頁 |
| 文件大?。?/td> | 95K |
| 代理商： | M27256-F6 |
A1
A0
Q0
Q1
Q2
A7
A6
A5
A4
A3
A2
A13
A8
A9
A11
G
A10
E
Q7
Q6
A14
Q5
Q4
Q3
VSS
A12
VPP
VCC
AI00768
M27256
8
9
10
11
12
13
14
1
2
3
4
5
6
7
16
15
28
27
26
25
24
23
22
21
20
19
18
17
Figure 2. DIP Pin Connections
Symbol
Parameter
Value
Unit
T
A
Ambient Operating Temperature
grade 1
grade 6
0 to 70
–40 to 85
°
C
T
BIAS
Temperature Under Bias
grade 1
grade 6
–10 to 80
–50 to 95
°
C
T
STG
Storage Temperature
–65 to 125
°
C
V
IO
Input or Output Voltages
–0.6 to 6.25
V
V
CC
Supply Voltage
–0.6 to 6.25
V
V
A9
VA9 Voltage
–0.6 to 13.5
V
V
PP
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 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 V
PP
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 (t
AVQV
)
is equal to the delay from E to output (t
ELQV
). 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 t
AVQV
-t
GLQV
.
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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