NM27C256 Fairchild, NM27C256 Datasheet - Page 4

• Manufacturer Part Number: NM27C256
• Description: 262 /144-Bit (32K x 8) High Performance CMOS EPROM
• Manufacturer: Fairchild

AC Test Conditions
Output Load
Input Rise and Fall Times
Input Pulse Levels
Timing Measurement Reference Level (Note 10)
AC Waveforms
Note 1: Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is stress rating only and functional operation of the
device at these or any other conditions above 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.
Note 2: This parameter is only sampled and is not 100% tested.
Note 3: OE may be delayed up to t
Note 4: The t
High to TRI-STATE
Low to TRI-STATE, the measured V
Note 5: TRI-STATE may be attained using OE or CE.
Note 6: The power switching characteristics of EPROMs require careful device decoupling. It is recommended that at least a 0.1 F ceramic capacitor be used on every device
between V
Note 7: The outputs must be restricted to V
Note 8: TTL Gate: I
C
Note 9: V
Note 10: Inputs and outputs can undershoot to -2.0V for 20 ns Max.
Note 11: CMOS inputs: V
Programming Characteristics
L
= 100 pF includes fixture capacitance.
Inputs
Outputs
Symbol
CC
PP
and GND.
may be connected to V
DF
and t
®
, the measured V
OL
CF
= 1.6 mA, I
compare level is determined as follows:
IL
= GND 0.3V, V
(Note 6) (Note 7) (Note 9)
1 TTL Gate and CL = 100 pF (Note 8)
OH
ACC
OL1
CC
= -400 A.
OH1
Parameter
except during programming.
ADDRESSES
(DC) + 0.10V.
- t
(DC) - 0.10V;
OE
IH
OUTPUT
CC
after the falling edge of CE without impacting t
= V
+ 1.0V to avoid latch-up and device damage.
CC
OE
CE
0.3V.
2.0V
0.8V
2.0V
0.8V
2.0V
0.8V
2.0V
0.8V
Hi-Z
(Note 12) (Note 13) (Note 14) (Note 15)
0.8V and 2.0V
0.8V and 2.0V
0.45 to 2.4V
(Note 3)
t
ACC
t
CE
(Note 3)
t
5 ns
OE
Conditions
ADDRESSES VALID
4
ACC
.
VALID OUTPUT
Min
t
OH
(Notes 4, 5)
(Notes 4, 5)
t
t
CE
DF
Typ
Hi-Z
DS010833-4
Max
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