NM27C256 262,144-Bit (32K x 8) High Performance CMOS EPROM
Connection Diagrams
27C080 27C040 27C020 27C010 27C512
A19 XX/VPP XX/VPP XX/VPP
A16
A16
A16
A16
A15
A15
A15
A15
A12
A12
A12
A12
A7
A7
A7
A7
A6
A6
A6
A6
A5
A5
A5
A5
A4
A4
A4
A4
A3
A3
A3
A3
A2
A2
A2
A2
A1
A1
A1
A1
A0
A0
A0
A0
O0
O0
O0
O0
O1
O1
O1
O1
O2
O2
O2
O2
GND GND
GND
GND
DlP
NM27C256
V
PP
A12
A7
A6
A5
A4
A3
A2
A1
A0
O0
O1
O2
GND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
27C512
27C010
27C020
27C040
27C080
A15
A12
A7
A6
A5
A4
A3
A2
A1
A0
O0
O1
O2
GND
VCC
VCC
VCC
VCC
XX/PGM XX/PGM A18
A18
VCC
V
CC
XX
A17
A17
A17
A14
A14
A14
A14
A14
A14
A13
A13
A13
A13
A13
A13
A8
A8
A8
A8
A8
A8
A9
A9
A9
A9
A9
A9
A11
A11
A11
A11
A11
A11
OE/VPP
OE
OE
OE
OE
OE/VPP
A10
A10
A10
A10
A10
A10
CE/PGM
CE/PGM
CE
CE
CE/PGM CE/PGM
O7
O7
O7
O7
O7
O7
O6
O6
O6
O6
O6
O6
O5
O5
O5
O5
O5
O5
O4
O4
O4
O4
O4
O4
O3
O3
O3
O3
O3
O3
DS010833-2
Note:
Compatible EPROM pin configurations are shown in the blocks adjacent to the NM27C256 pins.
Commercial Temp. Range (0
°
C to +70
°
C)
V
CC
= 5V
±
10%
Parameter/Order Number
NM27C256 Q, N, V 90
NM27C256 Q, N, V 100
NM27C256 Q, N, V 120
NM27C256 Q, N, V 150
NM27C256 Q, N, V 200
Pin Names
Symbol
A0–A14
CE/PGM
OE
O0–O7
XX
Description
Addresses
Chip Enable/Program
Output Enable
Outputs
Don’t Care (during Read)
Access Time (ns)
90
100
120
150
200
Extended Temp. Range (-40
°
C to +85
°
C)
V
CC
= 5V
±
10%
Parameter/Order Number
NM27C256 QE, NE, VE 120
NM27C256 QE, NE, VE 150
NM27C256 QE, NE, VE 200
PLCC
A
7
A
12
V
PP
XX
V
CC
A
14
A
13
4
3
2
1 32 31 30
Access Time (ns)
120
150
200
Note:
Surface mount PLCC package available for commercial and extended
temperature ranges only.
Package Types: NM27C256 Q, N, V XXX
Q = Quartz-Windowed Ceramic DIP
N = Plastic OTP DIP
V = Surface-Mount PLCC
• All Packages conform to the JEDEC standard.
• All versions are guaranteed to function for slower speeds.
A
6
A
5
A
4
A
3
A
2
A
1
A
0
XX
O
0
5
6
7
8
9
10
11
12
13
14 15 16 17 18 19 20
29
28
27
26
25
24
23
22
21
A
8
A
9
A
11
XX
OE
A
10
CE/PGM
O
7
O
6
O
1
O
2
GND
XX
O
3
O
4
O
5
DS010833-3
Top
2
www.fairchildsemi.com
NM27C256 262,144-Bit (32K x 8) High Performance CMOS EPROM
Absolute Maximum Ratings
(Note 1)
Storage Temperature
All Input Voltages except A9 with
Respect to Ground
V
PP
and A9 with Respect
to Ground
V
CC
Supply Voltage with
Respect to Ground
-65°C to +150°C
-0.6V to +7V
-0.7V to +14V
-0.6V to +7V
ESD Protection
All Output Voltages with
Respect to Ground
> 2000V
V
CC
+ 1.0V to GND -0.6V
Operating Range
Range
Comm’l
Industrial
Temperature
0°C to +70°C
-40°C to +85°C
V
CC
+5V
±10%
+5V
±10%
Read Operation
DC Electrical Characteristics
Over Operating Range with V
PP
= V
CC
Symbol
V
IL
V
IH
V
OL
V
OH
I
SB1
(Note 11)
I
SB2
I
CC1
I
PP
V
PP
I
LI
I
LO
Parameter
Input Low Level
Input High Level
Output Low Voltage
Output High Voltage
V
CC
Standby Current
(CMOS)
V
CC
Standby Current (TTL)
V
CC
Active Current
TTL Inputs
V
PP
Supply Current
V
PP
Read Voltage
Input Load Current
Output Leakage Current
Test Conditions
Min
-0.5
2.0
Max
0.8
V
CC
+1
0.4
Units
V
V
V
V
I
OL
= 2.1 mA
I
OH
= -2.5 mA
CE = V
CC
±0.3V
CE = V
IH
CE = OE = V
IL
,f=5 MHz
Inputs = V
IH
or V
IL
, I/O = 0 mA
V
PP
= V
CC
V
CC
- 0.7
V
IN
= 5.5V or GND
V
OUT
= 5.5V or GND
-1
-10
3.5
100
1
35
10
V
CC
1
10
µA
mA
mA
µA
V
µA
µA
AC Electrical Characteristics
Over Operating Range with V
PP
= V
CC
Symbol
t
ACC
t
CE
t
OE
t
DF
(Note 2)
t
OH
(Note 2)
Parameter
Address to Output Delay
CE to Output Delay
OE to Output Delay
Output Disable to
Output Float
Output Hold from
Addresses,
CE or OE, Whichever
Occurred First
90
100
120
150
200
Units
Min Max Min Max Min Max Min Max Min Max
90
90
35
30
0
0
100
100
50
30
0
120
120
50
35
0
150
150
50
45
0
200
200
50
45
ns
Capacitance
(Note 2) T
A
= +25˚C, f = 1 MHz
Symbol
C
IN
C
OUT
Parameter
Input Capacitance
Output Capacitance
Conditions Typ Max Units
V
IN
= 0V
V
OUT
= 0V
6
9
12
12
pF
pF
3
www.fairchildsemi.com
NM27C256 262,144-Bit (32K x 8) High Performance CMOS EPROM
AC Test Conditions
Output Load
1 TTL Gate and CL = 100 pF (Note 8)
≤
5 ns
0.45 to 2.4V
Input Rise and Fall Times
Input Pulse Levels
Timing Measurement Reference Level (Note 10)
Inputs
0.8V and 2.0V
Outputs
0.8V and 2.0V
AC Waveforms
(Note 6) (Note 7) (Note 9)
ADDRESSES
2.0V
0.8V
ADDRESSES VALID
CE
2.0V
0.8V
t
CE
t
CE
(Notes 4, 5)
OE
2.0V
0.8V
t
OE
(Note 3)
t
DF
(Notes 4, 5)
OUTPUT
2.0V
0.8V
Hi-Z
t
ACC
(Note 3)
VALID OUTPUT
t
OH
Hi-Z
DS010833-4
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
ACC
- t
OE
after the falling edge of CE without impacting t
ACC
.
Note 4:
The t
DF
and t
CF
compare level is determined as follows:
High to TRI-STATE
®
, the measured V
OH1
(DC) - 0.10V;
Low to TRI-STATE, the measured V
OL1
(DC) + 0.10V.
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
µF
ceramic capacitor be used on every device
between V
CC
and GND.
Note 7:
The outputs must be restricted to V
CC
+ 1.0V to avoid latch-up and device damage.
Note 8:
TTL Gate: I
OL
= 1.6 mA, I
OH
= -400
µA.
C
L
= 100 pF includes fixture capacitance.
Note 9:
V
PP
may be connected to V
CC
except during programming.
Note 10:
Inputs and outputs can undershoot to -2.0V for 20 ns Max.
Note 11:
CMOS inputs: V
IL
= GND
±0.3V,
V
IH
= V
CC
±0.3V.
Programming Characteristics
(Note 12) (Note 13) (Note 14) (Note 15)
Symbol
Parameter
Conditions
Min
Typ
Max
Units
4
www.fairchildsemi.com
NM27C256 262,144-Bit (32K x 8) High Performance CMOS EPROM
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