July 1998
NM27C256
262,144-Bit (32K x 8) High Performance CMOS EPROM
General Description
The NM27C256 is a 256K Electrically Programmable Read Only Memory. It is manufactured in Fairchild’s latest CMOS split gate EPROM technology which enables it to operate at speeds as fast as 90 ns access time over the full operating range.
The NM27C256 provides microprocessor-based systems extensive storage capacity for large portions of operating system and application software. Its 90 ns access time provides high speed operation with high-performance CPUs. The NM27C256 offers a single chip solution for the code storage requirements of 100% firmware-based equipment. Frequently-used software routines are quickly executed from EPROM storage, greatly enhancing system utility.
The NM27C256 is configured in the standard EPROM pinout which provides an easy upgrade path for systems which are currently using standard EPROMs.
The NM27C256 is one member of a high density EPROM Family which range in densities up to 4 Mb.
Features
■High performance CMOS
—90 ns access time
■JEDEC standard pin configuration
—28-pin PDIP package
—32-pin chip carrier
—28-pin CERDIP package
■Drop-in replacement for 27C256 or 27256
■Manufacturer’s identification code
Block Diagram
Data Outputs O0 - O7
VCC
GND
VPP
OE
Output Enable
and Chip Enable Logic Output
CE/PGM
Buffers
Y Decoder |
. |
|
. |
Y Gating
A0 - A14 |
|
|
|
Address |
|
|
|
|
|
|
|
Inputs |
|
|
. |
|
|
||
|
|
X Decoder |
. . . . . |
|
|
||
|
|
||
|
|
. |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
DS010833-1
EPROM CMOS Performance High 8) x (32K Bit-262,144 NM27C256
© 1998 Fairchild Semiconductor Corporation |
1 |
www.fairchildsemi.com |
Connection Diagrams
27C080 |
27C040 |
27C020 |
27C010 27C512 |
|
|
|
DlP |
|
|
|
|
|
|
|
27C512 |
27C010 |
|
27C020 |
|
27C040 |
|
27C080 |
|||||||||||||||||
A19 |
XX/VPP |
XX/VPP |
XX/VPP |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
VCC |
|
VCC |
|
VCC |
|
VCC |
||||||||||||||
|
|
|
NM27C256 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
||||||||||||||||||||||
A16 |
A16 |
A16 |
A16 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
||
|
|
|
|
|
|
|
|
|
|
VCC |
XX/PGM |
XX/PGM |
|
A18 |
|
A18 |
|||||||||||||||||||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
||||||||||||||||||||||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
||||||||||||||||||||||||||
A15 |
A15 |
A15 |
A15 |
A15 |
VPP |
|
1 |
28 |
|
VCC |
|
|
XX |
|
A17 |
|
A17 |
|
A17 |
||||||||||||||||||||
|
|
||||||||||||||||||||||||||||||||||||||
A12 |
A12 |
A12 |
A12 |
A12 |
A12 |
|
2 |
27 |
|
A14 |
|
|
A14 |
A14 |
|
A14 |
|
A14 |
|
A14 |
|||||||||||||||||||
|
|
||||||||||||||||||||||||||||||||||||||
A7 |
A7 |
A7 |
A7 |
A7 |
A7 |
|
3 |
26 |
|
A13 |
|
|
A13 |
A13 |
|
A13 |
|
A13 |
|
A13 |
|||||||||||||||||||
|
|
||||||||||||||||||||||||||||||||||||||
|
|
|
|||||||||||||||||||||||||||||||||||||
A6 |
A6 |
A6 |
A6 |
A6 |
A6 |
|
4 |
25 |
|
A8 |
|
|
A8 |
|
A8 |
|
|
A8 |
|
|
A8 |
|
|
A8 |
|||||||||||||||
|
|
||||||||||||||||||||||||||||||||||||||
A5 |
A5 |
A5 |
A5 |
A5 |
A5 |
|
5 |
24 |
|
A9 |
|
|
A9 |
|
A9 |
|
|
A9 |
|
|
A9 |
|
|
A9 |
|||||||||||||||
|
|
||||||||||||||||||||||||||||||||||||||
|
|
||||||||||||||||||||||||||||||||||||||
A4 |
A4 |
A4 |
A4 |
A4 |
A4 |
|
6 |
23 |
|
A11 |
|
|
A11 |
A11 |
|
A11 |
|
A11 |
|
A11 |
|||||||||||||||||||
|
|
||||||||||||||||||||||||||||||||||||||
|
|
||||||||||||||||||||||||||||||||||||||
A3 |
A3 |
A3 |
A3 |
A3 |
A3 |
|
7 |
22 |
|
|
OE |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|||
|
|
|
|
|
OE/VPP |
OE |
|
OE |
OE |
OE/VPP |
|||||||||||||||||||||||||||||
|
|
||||||||||||||||||||||||||||||||||||||
A2 |
A2 |
A2 |
A2 |
A2 |
A2 |
|
8 |
21 |
|
A10 |
|
|
A10 |
A10 |
|
A10 |
|
A10 |
|
A10 |
|||||||||||||||||||
|
|
||||||||||||||||||||||||||||||||||||||
|
|
|
|
||||||||||||||||||||||||||||||||||||
A1 |
A1 |
A1 |
A1 |
A1 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
A1 |
|
|
20 |
|
|
|
|
|
|
CE/PGM |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|||||||||
|
9 |
|
CE/PGM |
|
CE |
|
CE |
CE/PGM |
CE/PGM |
||||||||||||||||||||||||||||||
|
|
||||||||||||||||||||||||||||||||||||||
A0 |
A0 |
A0 |
A0 |
A0 |
A0 |
|
10 |
19 |
|
O7 |
|
|
O7 |
O7 |
|
O7 |
|
O7 |
|
O7 |
|||||||||||||||||||
|
|
||||||||||||||||||||||||||||||||||||||
O0 |
O0 |
O0 |
O0 |
O0 |
O0 |
|
11 |
18 |
|
O6 |
|
|
O6 |
O6 |
|
O6 |
|
O6 |
|
O6 |
|||||||||||||||||||
|
|
||||||||||||||||||||||||||||||||||||||
|
|
|
|
||||||||||||||||||||||||||||||||||||
O1 |
O1 |
O1 |
O1 |
O1 |
O1 |
|
12 |
17 |
|
O5 |
|
|
O5 |
O5 |
|
O5 |
|
O5 |
|
O5 |
|||||||||||||||||||
|
|
||||||||||||||||||||||||||||||||||||||
O2 |
O2 |
O2 |
O2 |
O2 |
O2 |
|
13 |
16 |
|
O4 |
|
|
O4 |
O4 |
|
O4 |
|
O4 |
|
O4 |
|||||||||||||||||||
|
|
||||||||||||||||||||||||||||||||||||||
GND |
GND |
GND |
GND |
GND |
GND |
|
14 |
15 |
|
O3 |
|
|
O3 |
O3 |
|
O3 |
|
O3 |
|
O3 |
|||||||||||||||||||
|
|
Note: Compatible EPROM pin configurations are shown in the blocks adjacent to the NM27C256 pins. |
DS010833-2 |
Commercial Temp. Range (0°C to +70°C) VCC = 5V ±10%
Parameter/Order Number |
Access Time (ns) |
|
|
NM27C256 Q, N, V 90 |
90 |
|
|
NM27C256 Q, N, V 100 |
100 |
|
|
NM27C256 Q, N, V 120 |
120 |
|
|
NM27C256 Q, N, V 150 |
150 |
|
|
NM27C256 Q, N, V 200 |
200 |
|
|
Extended Temp. Range (-40°C to +85°C) VCC = 5V ±10%
Parameter/Order Number |
Access Time (ns) |
|
|
NM27C256 QE, NE, VE 120 |
120 |
|
|
NM27C256 QE, NE, VE 150 |
150 |
|
|
NM27C256 QE, NE, VE 200 |
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.
|
|
|
|
Pin Names |
|
|
|
|
|
Symbol |
Description |
|||
|
|
|
|
|
A0–A14 |
Addresses |
|||
|
|
|
|
|
CE/PGM |
Chip Enable/Program |
|||
|
|
|
|
|
|
|
OE |
|
Output Enable |
|
|
|
|
|
O0–O7 |
Outputs |
|||
|
|
|
|
|
|
XX |
Don’t Care (during Read) |
||
|
|
|
|
|
PLCC
|
7 |
12 |
PP |
XX |
CC |
14 |
13 |
|
|
|
|
|
|
|
||||||||
|
|
A A V |
V A A |
|
|
|
|
|
|
|
||||||||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
||
|
4 |
3 |
2 |
1 |
32 31 30 |
|
|
|
|
|
|
|
||||||||||
A6 |
|
5 |
|
|
|
|
|
|
|
|
|
|
|
29 |
|
|
A8 |
|||||
|
|
|
|
|
|
|
|
|
|
|
|
|
||||||||||
A5 |
|
6 |
|
|
|
|
|
|
|
|
|
|
|
28 |
|
|
A9 |
|||||
|
|
|
|
|
|
|
|
|
|
|
|
|
||||||||||
A4 |
|
7 |
|
|
|
|
|
|
|
|
|
|
|
27 |
|
|
A11 |
|||||
|
|
|
|
|
|
|
|
|
|
|
|
|
||||||||||
A3 |
|
8 |
|
|
|
|
|
|
|
|
|
|
|
26 |
|
|
XX |
|||||
|
|
|
|
|
|
|
|
|
|
|
|
|
||||||||||
A2 |
|
9 |
|
|
|
|
|
|
|
|
|
|
|
25 |
|
|
OE |
|
|
|
||
|
|
|
|
|
|
|
|
|
|
|
|
|
||||||||||
A1 |
|
10 |
|
|
|
|
|
|
|
|
|
|
|
24 |
|
|
A10 |
|||||
|
|
|
|
|
|
|
|
|
|
|
|
|
||||||||||
|
|
11 |
|
|
|
|
|
|
|
|
|
|
|
23 |
|
|
|
|
|
|
||
A0 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
CE/PGM |
|||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
||||||||||
XX |
|
12 |
|
|
|
|
|
|
|
|
|
|
|
22 |
|
|
O7 |
|||||
|
|
|
|
|
|
|
|
|
|
|
|
|
||||||||||
O0 |
|
13 |
|
|
|
|
|
17 |
18 |
|
|
21 |
|
|
O6 |
|||||||
|
|
|
|
|
|
|
|
|
||||||||||||||
|
14 15 16 |
19 20 |
|
|
|
|
|
|
|
|||||||||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
O |
O |
GND |
XX |
O |
O |
O |
|
|
|
|
|
|
|
|||||||
|
1 |
2 |
|
|
|
|
3 |
4 |
5 |
|
|
DS010833-3 |
||||||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Top
EPROM CMOS Performance High 8) x (32K Bit-262,144 NM27C256
2 |
www.fairchildsemi.com |
Absolute Maximum Ratings (Note 1)
Storage Temperature |
-65°C to +150°C |
All Input Voltages except A9 with |
|
Respect to Ground |
-0.6V to +7V |
VPP and A9 with Respect |
|
to Ground |
-0.7V to +14V |
VCC Supply Voltage with |
|
Respect to Ground |
-0.6V to +7V |
ESD Protection |
|
|
> 2000V |
|
All Output Voltages with |
|
|
||
Respect to Ground |
VCC + 1.0V to GND -0.6V |
|||
Operating Range |
|
|||
|
|
|
|
|
Range |
|
Temperature |
VCC |
|
Comm’l |
|
|
0°C to +70°C |
+5V ±10% |
|
|
|
|
|
Industrial |
|
|
-40°C to +85°C |
+5V ±10% |
|
|
|
|
|
Read Operation
DC Electrical Characteristics Over Operating Range with VPP = VCC
Symbol |
Parameter |
|
|
|
|
Test Conditions |
Min |
Max |
Units |
||
|
|
|
|
|
|
|
|
|
|
|
|
VIL |
Input Low Level |
|
|
|
|
|
|
-0.5 |
0.8 |
V |
|
VIH |
Input High Level |
|
|
|
|
|
|
2.0 |
VCC +1 |
V |
|
VOL |
Output Low Voltage |
IOL = 2.1 mA |
|
0.4 |
V |
|
|||||
VOH |
Output High Voltage |
IOH = -2.5 mA |
3.5 |
|
V |
||||||
ISB1 |
VCC Standby Current |
|
CE |
= VCC ±0.3V |
|
100 |
μA |
|
|||
(Note 11) |
(CMOS) |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
ISB2 |
VCC Standby Current (TTL) |
CE = VIH |
|
1 |
mA |
|
|||||
ICC1 |
VCC Active Current |
|
|
= VIL,f=5 MHz |
|
35 |
mA |
||||
|
CE |
= |
OE |
|
|||||||
|
TTL Inputs |
Inputs = VIH or VIL, I/O = 0 mA |
|
|
|
|
|||||
|
|
|
|
|
|
|
|
|
|
|
|
IPP |
VPP Supply Current |
VPP = VCC |
|
10 |
μA |
|
|||||
VPP |
VPP Read Voltage |
|
|
|
|
|
|
VCC - 0.7 |
VCC |
V |
|
ILI |
Input Load Current |
VIN = 5.5V or GND |
-1 |
1 |
μA |
|
|||||
ILO |
Output Leakage Current |
VOUT = 5.5V or GND |
-10 |
10 |
μA |
AC Electrical Characteristics Over Operating Range with VPP = VCC
Symbol |
|
|
Parameter |
|
90 |
|
|
|
100 |
|
|
120 |
150 |
200 |
Units |
||||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
||||
|
|
|
|
|
|
|
Min |
Max |
Min |
Max |
Min |
Max |
Min |
Max |
Min |
Max |
|
||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
tACC |
|
Address to Output Delay |
|
|
90 |
|
|
100 |
|
|
|
120 |
|
150 |
|
200 |
ns |
||||||
tCE |
|
|
|
|
|
|
|
|
90 |
|
|
100 |
|
|
|
120 |
|
150 |
|
200 |
|
||
|
CE to Output Delay |
|
|
|
|
|
|
|
|
|
|||||||||||||
tOE |
|
|
|
|
|
|
|
|
35 |
|
|
50 |
|
|
|
50 |
|
50 |
|
50 |
|
||
|
OE to Output Delay |
|
|
|
|
|
|
|
|
|
|
|
|||||||||||
tDF |
|
Output Disable to |
|
|
|
30 |
|
|
30 |
|
|
|
35 |
|
45 |
|
45 |
|
|||||
(Note 2) |
|
Output Float |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
tOH |
|
Output Hold from |
|
0 |
|
|
|
|
0 |
|
|
|
0 |
|
|
0 |
|
0 |
|
|
|||
(Note 2) |
|
Addresses, |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|||
|
|
CE or |
OE, |
Whichever |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
||
|
|
Occurred First |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Capacitance (Note 2) TA = +25˚C, f = 1 MHz |
|
|
|
|
|
|
|
|
|
|
|
|
|||||||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Symbol |
|
Parameter |
Conditions |
|
Typ |
Max |
Units |
|
|
|
|
|
|
|
|||||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|||
CIN |
|
Input Capacitance |
VIN = 0V |
|
6 |
|
12 |
|
|
pF |
|
|
|
|
|
|
|
||||||
COUT |
|
Output Capacitance |
VOUT = 0V |
|
9 |
|
12 |
|
|
pF |
|
|
|
|
|
|
|
EPROM CMOS Performance High 8) x (32K Bit-262,144 NM27C256
3 |
www.fairchildsemi.com |
AC Test Conditions
Output Load |
1 TTL Gate and CL = 100 pF (Note 8) |
|
Input Rise and Fall Times |
≤ 5 ns |
|
Input Pulse Levels |
|
0.45 to 2.4V |
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 |
|
ADDRESSES VALID |
|
0.8V |
|
|
CE 2.0V |
|
|
|
|
0.8V |
|
|
|
|
|
tCE |
OE 2.0V |
|
|
|
|
0.8V |
|
|
|
|
|
tOE |
|
|
|
(Note 3) |
OUTPUT |
2.0V |
Hi-Z |
VALID OUTPUT |
|
0.8V |
|
|
|
|
|
|
|
|
|
tACC |
|
|
|
(Note 3) |
tCE |
(Notes 4, 5) |
tDF |
(Notes 4, 5) |
Hi-Z |
tOH
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 tACC - tOE after the falling edge of CE without impacting tACC.
Note 4: The tDF and tCF compare level is determined as follows:
High to TRI-STATE®, the measured VOH1 (DC) - 0.10V;
Low to TRI-STATE, the measured VOL1 (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 VCC and GND.
Note 7: The outputs must be restricted to VCC + 1.0V to avoid latch-up and device damage.
Note 8: TTL Gate: IOL = 1.6 mA, IOH = -400 μA. CL = 100 pF includes fixture capacitance.
Note 9: VPP may be connected to VCC except during programming.
Note 10: Inputs and outputs can undershoot to -2.0V for 20 ns Max.
Note 11: CMOS inputs: VIL = GND ±0.3V, VIH = VCC ±0.3V.
Programming Characteristics (Note 12) (Note 13) (Note 14) (Note 15)
Symbol |
Parameter |
Conditions |
Min |
Typ |
Max |
Units |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
EPROM CMOS Performance High 8) x (32K Bit-262,144 NM27C256
4 |
www.fairchildsemi.com |