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Atmel AT27C256R
4.
Absolute maximum ratings*
Temperature under bias . . . . . . . . . . . . . .-55°C to +125°C
Storage temperature . . . . . . . . . . . . . . . . .-65°C to +150°C
Voltage on any pin with
respect to ground . . . . . . . . . . . . . . . . . . . -2.0V to +7.0V (1)
*NOTICE:
Stresses beyond those listed under “Absolute
maximum ratings” may cause permanent damage to
the device. This is a stress rating only, and functional
operation of the device at these or any other conditions
beyond those indicated in the operational sections of
this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may
affect device reliability.
Voltage on A9 with
respect to ground . . . . . . . . . . . . . . . . . -2.0V to +14.0V (1)
V PP supply voltage with
respect to ground . . . . . . . . . . . . . . . . . . -2.0V to +14.0V (1)
Note:
1. Minimum voltage is -0.6V DC, which may undershoot to -2.0V for pulses of less than 20ns. Maximum output pin voltage is
V CC + 0.75V DC, which may overshoot to +7.0V for pulses of less than 20ns.
5.
DC and AC characteristics
Table 5-1.
Operating Modes
Mode/Pin
Read
CE
V IL
OE
V IL
Ai
Ai
V PP
V CC
Outputs
D OUT
X
Output disable
Standby
V IL
V IH
V IH
(1)
X
X
(1)
(1)
V CC
V CC
High Z
High Z
Rapid program (2)
V IL
V IH
Ai
V PP
D IN
PGM verify
(2)
X
(1)
V IL
Ai
V PP
D OUT
Optional PGM verify
(2)
V IL
V IL
Ai
V CC
D OUT
PGM inhibit
(2)
V IH
V IH
X
(1)
V PP
High Z
Product identification (4)
V IL
V IL
A9 = V H (3)
A0 = V IH or V IL
V CC
Identification code
A1 - A14 = V IL
Notes:
1. X can be V IL or V IH .
2. Refer to programming characteristics.
3. V H = 12.0 ± 0.5V.
4. Two identifier bytes may be selected. All Ai inputs are held low (V IL ), except A9, which is set to V H , and A0, which is tog-
gled low (V IL ) to select the manufacturer’s identification byte and high (V IH ) to select the device code byte.
Table 5-2.
DC and AC operating conditions for read operation
Atmel AT27C256R
-45
-70
Operating temp. (case)
V CC supply
Ind.
Auto.
-40 ? C - 85 ? C
5V ± ? 10%
-40 ? C - 85 ? C
-40 ? C - 125 ? C
5V ± ? 10%
3
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