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Details, datasheet, quote on part number:NM27C256
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Datasheet text preview:
NM27C256 262,144-Bit (32K x 8) High Performance CMOS EPROM
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
s High performance CMOS -- 90 ns access time s JEDEC standard pin configuration -- 28-pin PDIP package -- 32-pin chip carrier -- 28-pin CERDIP package s Drop-in replacement for 27C256 or 27256 s Manufacturer's identification code
Block Diagram
VCC GND VPP OE Output Enable and Chip Enable Logic CE/PGM
Data Outputs O0 - O7
Output Buffers
Y Decoder
..
Y Gating
A0 - A14 Address Inputs
.......
X Decoder
DS010833-1
© 1998 Fairchild Semiconductor Corporation
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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
VPP 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 VCC 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) VCC = 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
A0A14 CE/PGM OE O0O7 XX
Description
Addresses Chip Enable/Program Output Enable Outputs Don't Care (during Read)
Access Time (ns)
90 100 120 150 200
PLCC Extended Temp. Range (-40°C to +85°C) VCC = 5V ±10% Parameter/Order Number
NM27C256 QE, NE, VE 120 NM27C256 QE, NE, VE 150 NM27C256 QE, NE, VE 200
Access Time (ns)
4 3 2 1 32 31 30
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.
A6 A5 A4 A3 A2 A1 A0 XX O0
5 6 7 8 9 10 11 12 13
14 15 16 17 18 19 20
A7 A12 VPP XX VCC A14 A13
29 28 27 26 25 24 23 22 21
A8 A9 A11 XX OE A10 CE/PGM O7 O6
O1 O2 GND XX O3 O4 O5
DS010833-3
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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 VPP and A9 with Respect to Ground VCC 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 VCC + 1.0V to GND -0.6V
Operating Range
Range
Comm'l Industrial
Temperature
0°C to +70°C -40°C to +85°C
VCC
+5V ±10% +5V ±10%
Read Operation DC Electrical Characteristics Over Operating Range with VPP = VCC
Symbol
VIL VIH VOL VOH ISB1 (Note 11) ISB2 ICC1 IPP VPP ILI ILO
Parameter
Input Low Level Input High Level Output Low Voltage Output High Voltage VCC Standby Current (CMOS) VCC Standby Current (TTL) VCC Active Current TTL Inputs VPP Supply Current VPP Read Voltage Input Load Current Output Leakage Current
Test Conditions
Min
-0.5 2.0
Max
0.8 VCC +1 0.4
Units
V V V V
IOL = 2.1 mA IOH = -2.5 mA CE = VCC ±0.3V CE = VIH CE = OE = VIL,f=5 MHz Inputs = VIH or VIL, I/O = 0 mA VPP = VCC VCC - 0.7 VIN = 5.5V or GND VOUT = 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 VPP = VCC
Symbol
tACC tCE tOE tDF (Note 2) tOH (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) TA = +25°C, f = 1 MHz
Symbol
CIN COUT
Parameter
Input Capacitance Output Capacitance
Conditions Typ Max Units
VIN = 0V VOUT = 0V 6 9 12 12 pF pF
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