M27C256B-12N1TR STMicroelectronics, M27C256B-12N1TR Datasheet - Page 3

• Manufacturer Part Number: M27C256B-12N1TR
• Description: 256 Kbit (32Kb x 8) UV EPROM and OTP EPROM
• Manufacturer: STMicroelectronics

Table 2. Absolute Maximum Ratings
Notes: 1. Except for the rating ”Operating Temperature Range”, stresses above those listed in the Table ”Absolute Maximum Ratings”
Table 3. Operating Modes
Note: X = V
Table 4. Electronic Signature
Two Line Output Control
BecauseEPROMs 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
Manufacturer’s Code
Device Code
Read
Output Disable
Program
Verify
Program Inhibit
Standby
Electronic Signature
Symbol
will not occur.
V
V
T
T
V
V
A9
IO
T
BIAS
STG
2. Minimum DC voltage on Input or Output is –0.5V with possible undershoot to –2.0V for a period less than 20ns. Maximum DC
3. Depends on range.
CC
PP
A
(2)
(2)
Identifier
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.
voltage on Output is V
IH
Mode
or V
Ambient Operating Temperature
Temperature Under Bias
Storage Temperature
Input or Output Voltages (except A9)
Supply Voltage
A9 Voltage
Program Supply Voltage
IL
, V
ID
= 12V
CC
V
0.5V
A0
V
IH
IL
+0.5V with possible overshoot to V
V
IL
V
V
V
Q7
V
V
V
Pulse
E
0
1
IL
IL
IH
IH
IH
IL
Parameter
(1)
Q6
0
0
(3)
V
V
V
Q5
V
V
V
G
X
1
0
IH
IH
IH
IL
IL
IL
CC
+2V for a period less than 20ns.
For the most efficientuse of thesetwo control lines,
E should 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 mem-
ory devices are in their low power standby mode
and that the output pins are only active when data
is desired from a particular memory device.
Q4
0
0
Q3
A9
V
X
X
X
X
X
X
0
1
ID
Q2
0
1
–40 to 125
–50 to 125
–65 to 150
–2 to 7
–2 to 7
–2 to 13.5
–2 to 14
Value
V
V
V
V
V
V
V
V
Q1
0
0
PP
CC
CC
PP
PP
PP
CC
CC
Q0
0
1
M27C256B
Data Out
Data Out
Q0 - Q7
Data In
Codes
Hex Data
Hi-Z
Hi-Z
Hi-Z
Unit
V
V
V
V
C
C
C
8Dh
20h
3/15