M27W256 Datasheet, PDF (3/15 Pages) STMicroelectronics – 256 Kbit 32Kb x 8 Low Voltage UV EPROM and OTP EPROM

M27W256
Table 2. Absolute Maximum Ratings ⁽¹⁾
Symbol
Parameter
Value
Unit
T_A
Ambient Operating Temperature ⁽³⁾
–40 to 125
°C
T_BIAS
Temperature Under Bias
–50 to 125
°C
T_STG
Storage Temperature
–65 to 150
°C
V_IO ⁽²⁾
Input or Output Voltage (except A9)
–2 to 7
V
V_CC
Supply Voltage
–2 to 7
V
V_A9 ⁽²⁾
A9 Voltage
–2 to 13.5
V
V_PP
Program Supply Voltage
–2 to 14
V
Note: 1. 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 condi-
tions for extended periods may affect device reliability. Refer also to the STMicroelectronics SURE Program and other relevant qual-
ity documents.
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
voltage on Output is V_CC +0.5V with possible overshoot to V_CC +2V for a period less than 20ns.
3. Depends on range.
Table 3. Operating Modes
Mod e
E
G
Read
V_IL
V_IL
Output Disable
V_IL
V_IH
Program
V_IL Pulse
V_IH
Verify
V_IH
V_IL
Program Inhibit
V_IH
V_IH
Standby
V_IH
X
Electronic Signature
V_IL
V_IL
Note: X = V_IH or V_IL, V_ID = 12V ± 0.5V.
A9
V_PP
Q7-Q0
X
V_CC
Data Out
X
V_CC
Hi-Z
X
V_PP
Data In
X
V_PP
Data Out
X
V_PP
Hi-Z
X
V_CC
Hi-Z
V_ID
V_CC
Codes
Table 4. Electronic Signature
Ide ntifie r
A0
Q7
Q6
Q5
Q4
Q3
Q2
Q1
Q0 Hex Data
Manufacturer’s Code
V_IL
0
0
1
0
0
0
0
0
20h
Device Code
V_IH
1
0
0
0
1
1
0
1
8Dh
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