FAIRCHILD NMC27C64

NMC27C64
65,536-Bit (8192 x 8) CMOS EPROM
General Description
suited for high volume production applications where cost is an
important factor and programming only needs to be done once.
The NMC27C64 is a 64K UV erasable, electrically reprogrammable
and one-time programmable (OTP) CMOS EPROM ideally suited
for applications where fast turnaround, pattern experimentation
and low power consumption are important requirements.
This family of EPROMs are fabricated with Fairchild’s proprietary,
time proven CMOS double-poly silicon gate technology which
combines high performance and high density with low power
consumption and excellent reliability.
The NMC27C64 is designed to operate with a single +5V power
supply with ±10% tolerance. The CMOS design allows the part to
operate over extended and military temperature ranges.
Features
The NMC27C64Q is packaged in a 28-pin dual-in-line package
with a quartz window. The quartz window allows the user to
expose the chip to ultraviolet light to erase the bit pattern. A new
pattern can then be written electrically into the device by following
the programming procedure.
■ JEDEC standard pin configuration
— 28-pin Plastic DIP package
— 28-pin CERDIP package
■ High performance CMOS
— 150 ns access time
■ Drop-in replacement for 27C64 or 2764
The NMC27C64N is packaged in a 28-pin dual-in-line plastic
molded package without a transparent lid. This part is ideally
■ Manufacturers identification code
Block Diagram
VCC
Data Outputs O0 - O7
GND
VPP
OE
PGM
CE
Output Enable,
Chip Enable, and
Program Logic
Output
Buffers
..
Y Decoder
65,536-Bit
Cell Matrix
A0 - A12
Address
Inputs
.......
X Decoder
DS008634-1
© 1998 Fairchild Semiconductor Corporation
NMC27C64 Rev. C
1
www.fairchildsemi.com
NMC27C64 65,536-Bit (8192 x 8) CMOS EPROM
January 1999
27C512 27C256 27C128 27C32 27C16
27512
27256
27128 2732 2716
A15
A12
A7
A6
A5
A4
A3
A2
A1
A0
O0
O1
O2
GND
Note:
VPP
A12
A7
A6
A5
A4
A3
A2
A1
A0
O0
O1
O2
GND
VPP
A12
A7
A6
A5
A4
A3
A2
A1
A0
O0
O1
O2
GND
A7
A6
A5
A4
A3
A2
A1
A0
O0
O1
O2
GND
A7
A6
A5
A4
A3
A2
A1
A0
O0
O1
O2
GND
27C16
2716
NMC27C64
VPP
A12
A7
A6
A5
A4
A3
A2
A1
A0
O0
O1
O2
GND
1
28
2
27
3
26
4
25
5
24
6
23
7
22
8
21
9
20
10
19
11
18
12
17
13
16
14
15
27C32 27C128
2732
27128
VCC
PGM
VCC
VCC
NC
A8
A8
A8
A9
A9
A9
VPP
A11
A11
OE OE/VPP
OE
A10
A10
A10
CE CE/PGM CE
O7
O7
O7
O6
O6
O6
O5
O5
O5
O4
O4
O4
O3
O3
O3
Socket compatible EPROM pin configurations are shown in the blocks adjacent to the NMC27C64 pins.
27C256
27256
27C512
27512
VCC
VCC
VCC
PGM
A14
A14
A13
A13
A13
A8
A8
A8
A9
A9
A9
A11
A11
A11
OE
OE
OE/VPP
A10
A10
A10
CE
CE CE/PGM
O7
O7
O7
O6
O6
O6
O5
O5
O5
O4
O4
O4
O3
O3
O3
DS008634-2
Pin Names
A0–A12
Addresses
CE
Chip Enable
OE
Output Enable
O0 –O7
PGM
Outputs
Program
NC
No Connect
VPP
Programming
Voltage
VCC
Power Supply
GND
Ground
Commercial Temperature Range VCC = 5V ±10%
Parameter/Order Number
Access Time (ns)
NMC27C64Q, N 150
150
NMC27C64Q, N 200
200
Extended Temp Range (-40°C to +85°C) VCC = 5V ±10%
Parameter/Order Number
NMC27C64QE, NE200
200
2
NMC27C64 Rev. C
Access Time (ns)
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NMC27C64 65,536-Bit (8192 x 8) CMOS EPROM
Connection Diagram
Power Dissipation
Temperature Under Bias
-55°C to +125°C
Lead Temperature
(Soldering, 10 sec.)
300°C
Storage Temperature
-65°C to +150°C
ESD Rating
(Mil Spec 883C,
Method 3015.2)
2000V
All Input Voltages except A9
with Respect to Ground (Note 10)
+6.5V to -0.6V
All Output Voltages
with Respect to Ground (Note 10)VCC +1.0V to GND -0.6V
VPP Supply Voltage and A9
with Respect to Ground
During Programming
Operating Conditions (Note 7)
Temperature Range
NMC27C64Q 150, 200
NMC27C64N 150, 200
NMC27C64QE 200
NMC27C64NE 200
+14.0V to -0.6V
VCC Supply Voltage with
Respect to Ground
1.0W
+7.0V to -0.6V
0°C to +70°C
-40°C to +85°C
+5V ±10%
VCC Power Supply
READ OPERATION
DC Electrical Characteristics
Symbol
Parameter
Conditions
Min
Typ
Max
Units
ILI
Input Load Current
VIN = VCC or GND
10
µA
ILO
Output Leakage Current
VOUT = VCC or GND, CE = VIH
10
µA
ICC1
(Note 9)
VCC Current (Active)
TTL Inputs
CE = VIL ,f=5 MHz
Inputs = VIH or VIL, I/O = 0 mA
5
20
mA
ICC2
(Note 9)
VCC Current (Active)
CMOS Inputs
CE = GND, f = 5 MHz
Inputs = VCC or GND, I/O = 0 mA
3
10
mA
ICCSB1
VCC Current (Standby)
TTL Inputs
CE = VIH
0.1
1
mA
ICCSB2
VCC Current (Standby)
CMOS Inputs
CE = VCC
0.5
100
µA
IPP
VPP Load Current
VPP = VCC
10
µA
VIL
Input Low Voltage
-0.1
0.8
V
VIH
Input High Voltage
2.0
VCC +1
V
VOL1
Output Low Voltage
IOL = 2.1 mA
VOH1
Output High Voltage
IOH = -400 µA
VOL2
Output Low Voltage
IOL = 0 µA
VOH2
Output High Voltage
IOH = 0 µA
0.45
2.4
V
V
0.1
V
VCC - 0.1
V
AC Electrical Characteristics
NMC27C64
Symbol
Parameter
Conditions
150
Min
Max
200, E200
Min
Max
Units
tACC
Address to
Output Delay
CE = OE = VIL
PGM = VIH
150
200
ns
tCE
CE to Output Delay
OE = VIL, PGM = VIH
150
200
ns
tOE
OE to Output Delay
CE = VIL, PGM = VIH
60
ns
tDF
OE High to Output Float
CE = VIL, PGM = VIH
0
60
0
60
ns
tCF
CE High to Output Float
OE = VIL, PGM = VIH
0
60
0
60
ns
tOH
Output Hold from
Addresses, CE or OE ,
Whichever Occurred First
CE = OE = VIL
PGM = VIH
0
60
3
NMC27C64 Rev. C
0
ns
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NMC27C64 65,536-Bit (8192 x 8) CMOS EPROM
Absolute Maximum Ratings (Note 1)
NMC27C64 65,536-Bit (8192 x 8) CMOS EPROM
Capacitance TA = +25˚C, f = 1 MHz (Note 2) NMC27C64Q
Symbol
CIN
COUT
Parameter
Conditions
Typ
Max
Units
Input Capacitance
VIN = 0V
6
8
pF
Output Capacitance
VOUT = 0V
9
12
pF
Typ
Max
Units
Capacitance TA = +25˚C, f = 1 MHz (Note 2) NMC27C64N
Symbol
CIN
COUT
Parameter
Conditions
Input Capacitance
VIN = 0V
5
10
pF
Output Capacitance
VOUT = 0V
8
10
pF
AC Test Conditions
Output Load
1 TTL Gate and CL = 100 pF (Note 8)
≤5 ns
Input Rise and Fall Times
Input Pulse Levels
0.45V to 2.4V
Timing Measurement Reference Level
Inputs
Outputs
0.8V and 2V
0.8V and 2V
AC Waveforms (Note 6) (Note 9)
ADDRESS
2V
0.8V
CE
2V
0.8V
OE
OUTPUT
Address Valid
t CF
2V
0.8V
2V
(Notes 4, 5)
t CE
t OE
t DF
(Note 3)
(Notes 4, 5)
Hi-Z
Hi-Z
Valid Output
0.8V
t ACC
t OH
(Note 3)
Note 1: Stresses above 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 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: 1 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.
4
NMC27C64 Rev. C
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Symbol
Parameter
Conditions
Min
Typ
Max
Units
tAS
Address Setup Time
2
µs
tOES
OE Setup Time
2
µs
tCES
CE Setup Time
2
µs
tDS
Data Setup Time
2
µs
tVPS
VPP Setup Time
2
µs
tVCS
VCC Setup Time
2
µs
tAH
Address Hold Time
0
µs
tDH
Data Hold Time
2
µs
tDF
Output Enable to
Output Float Delay
tPW
Program Pulse Width
tOE
Data Valid from OE
CE = VIL
IPP
VPP Supply Current During
Programming Pulse
CE = VIL
PGM = VIL
ICC
VCC Supply Current
TA
Temperature Ambient
20
25
VCC
Power Supply Voltage
5.75
6.0
6.25
V
VPP
Programming Supply Voltage
12.2
13.0
13.3
V
tFR
Input Rise, Fall Time
CE = VIL
0
0.45
0.5
130
ns
0.55
ms
150
ns
30
mA
10
mA
30
˚C
5
ns
VIL
Input Low Voltage
VIH
Input High Voltage
2.4
4.0
tIN
Input Timing Reference Voltage
0.8
1.5
2.0
V
Output Timing Reference Voltage
0.8
1.5
2.0
V
tOUT
0.0
5
NMC27C64 Rev. C
0.45
V
V
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NMC27C64 65,536-Bit (8192 x 8) CMOS EPROM
Programming Characteristics (Note 11) (Note 12) (Note 13) (Note 14)
NMC27C64 65,536-Bit (8192 x 8) CMOS EPROM
Programming Waveforms (Note 13)
Program
Verify
Program
ADDRESS
2V
0.8V
Address N
t AS
DATA
2V
t AH
t DS
6.0V
VCC
VPP
CE
13.0V
Hi-Z
Data In Stable
Add N
0.8V
Data Out Valid
Add N
t DF
t DH
tVCS
t VPS
0.8V
t CES
2V
PGM
0.8V
t PW
t OES
t OE
2V
OE
0.8V
Note 11: Fairchild’s standard product warranty applies to devices programmed to specifications described herein.
Note 12: VCC must be applied simultaneously or before VPP and removed simultaneously or after VPP. The EPROM must not be inserted into or removed from a board with
voltage applied to VPP or VCC.
Note 13: The maximum absolute allowable voltage which may be applied to the VPP pin during programming is 14V. Care must be taken when switching the VPP supply to
prevent any overshoot from exceeding this 14V maximum specification. At least a 0.1 µF capacitor is required across VPP, VCC to GND to suppress spurious voltage transients
which may damage the device.
Note 14: Programming and program verify are tested with the interactive Program Algorithm, at typical power supply voltages and timings.
6
NMC27C64 Rev. C
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NMC27C64 65,536-Bit (8192 x 8) CMOS EPROM
Fast Programming Algorithm Flow Chart
Start
ADDR = First Location
VCC = 6.25 V
VPP = 12.75V
X=0
Program one 100 µs Pulse
Increment X
X = 20 ?
Yes
No
Fail
Verify
Byte
Verify
Byte
Pass
Increment ADDR
No
Fail
Device
Failed
Pass
Last
Address
Yes
1st VCC = VPP =5.5V
2nd VCC = VPP =4.5V
Fail
Device
Failed
Pass
Device Passed
FIGURE 1.
7
NMC27C64 Rev. C
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To most efficiently use these two control lines, it is recomended
that CE (pin 20) be decoded and used as the primary device
selecting function, while OE (pin 22) be made a common connection to all devices in the array and connected to the READ line from
the system control bus. This assures that all deselected memory
devices are in their low power standby modes and that the output
pins are active only when data is desired from a particular memory
device.
DEVICE OPERATION
The six modes of operation of the NMC27C64 are listed in Table
1. It should be noted that all inputs for the six modes are at TTL
levels. The power supplies required are VCC and VPP. The VPP
power supply must be at 12.75V during the three programming
modes, and must be at 5V in the other three modes. The VCC
power supply must be at 6V during the three programming modes,
and at 5V in the other three modes.
Programming
CAUTION: Exceeding 14V on pin 1 (VPP) will damage the
NMC27C64.
Read Mode
The NMC27C64 has two control functions, both of which must be
logically active in order to obtain data at the outputs. Chip Enable
(CE) is the power control and should be used for device selection.
Output Enable (OE) is the output control and should be used to
gate data to the output pins, independent of device selection. The
programming pin (PGM) should be at VIH except during programming. Assuming that addresses are stable, address access time
(tACC) is equal to the delay from CE to output (tCE). Data is available
at the outputs tOE after the falling edge of OE , assuming that CE
has been low and addresses have been stable for at least tACC –
tOE.
Initially, all bits of the NMC27C64 are in the “1” state. Data is
introduced by selectively programming “0s” into the desired bit
locations. Although only “0s” will be programmed, both “1s” and
“0s” can be presented in the data word. A “0” cannot be changed
to a “1” once the bit has been programmed.
The NMC27C64 is in the programming mode when the VPP power
supply is at 12.75V and OE is at VIH. It is required that at least a
0.1 µF capacitor be placed across VPP, VCC to ground to suppress
spurious voltage transients which may damage the device. The
data to be programmed is applied 8 bits in parallel to the data
output pins. The levels required for the address and data inputs
are TTL.
The sense amps are clocked for fast access time. VCC should
therefore be maintained at operating voltage during read and
verify. If VCC temporarily drops below the spec. voltage (but not to
ground) an address transition must be performed after the drop to
insure proper output data.
For programming, CE should be kept TTL low at all times while VPP
is kept at 12.75V.
When the address and data are stable, an active low, TTL program
pulse is applied to the PGM input. A program pulse must be
applied at each address location to be programmed. The
NMC27C64 is programmed with the Fast Programming Algorithm
shown in Figure 1. Each address is programmed with a series of
100 µs pulses until it verfies good, up to a maximum of 25 pulses.
Most memory cells will program with a single 100 µs pulse. The
NMC27C64 must not be programmed with a DC signal applied to
the PGM input.
Standby Mode
The NMC27C64 has a standby mode which reduces the active
power dissipation by 99%, from 55 mW to 0.55 mW. The
NMC27C64 is placed in the standby mode by applying a CMOS
high signal to the CE input. When in standby mode, the outputs are
in a high impedance state, independent of the OE input.
Output OR-Tying
Because NMC27C64s are usually used in larger memory arrays,
Fairchild has provided a 2-line control function that accommodates this use of multiple memory connections. The 2-line control
function allows for:
Programming multiple NMC27C64s in parallel with the same data
can be easily accomplished due to the simplicity of the programming requirements. Like inputs of the paralleled NMC27C64s may
be connected together when they are programmed with the same
data. A low level TTL pulse applied to the PGM input programs the
paralleled NMC27C64s. If an application requires erasing and
reprogramming, the NMC27C64Q UV erasable PROM in a windowed package should be used.
1. the lowest possible memory power dissipation, and
2. complete assurance that output bus contention will not
occur.
TABLE 1. Mode Selection
Pins
Mode
Read
Standby
CE
(20)
OE
(22)
PGM
(27)
VPP
(1)
VCC
(28)
Outputs
(11–13, 15–19)
VIL
VIL
VIH
5V
5V
DOUT
VIH
Don’t Care
Don’t Care
5V
5V
Hi-Z
Don’t Care
VIH
VIH
5V
5V
Hi-Z
Program
VIL
VIH
13V
6V
DIN
Program Verify
VIL
VIL
VIH
13V
6V
DOUT
Program Inhibit
VIH
Don’t Care
Don’t Care
13V
6V
Hi-Z
Output Disable
8
NMC27C64 Rev. C
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NMC27C64 65,536-Bit (8192 x 8) CMOS EPROM
Functional Description
After programming, opaque labels should be placed over the
NMC27C64’s window to prevent unintentional erasure. Covering
the window will also prevent temporary functional failure due to the
generation of photo currents.
Program Inhibit
Programming multiple NMC27C64s in parallel with different data
is also easily accomplished. Except for CE all like inputs (including
OE and PGM) of the parallel NMC27C64 may be common. A TTL
low level program pulse applied to an NMC27C64’s PGM input
with CE at VIL and VPP at 13.0V will program that NMC27C64. A
TTL high level CE input inhibits the other NMC27C64s from being
programmed.
The recommended erasure procedure for the NMC27C64 is
exposure to short wave ultraviolet light which has a wavelength of
2537 Angstroms (Å). The integrated dose (i.e., UV intensity x
exposure time) for erasure should be a minimum of 15W-sec/cm2.
The NMC27C64 should be placed within 1 inch of the lamp tubes
during erasure. Some lamps have a filter on their tubes which
should be removed before erasure.
Program Verify
A verify should be performed on the programmed bits to determine
whether they were correctly programmed. The verify may be
performed with VPP at 13.0V. VPP must be at VCC, except during
programming and program verify.
An erasure system should be calibrated periodically. The distance
from lamp to unit should be maintained at one inch. The erasure
time increases as the square of the distance. (If distance is
doubled the erasure time increases by a factor of 4.) Lamps lose
intensity as they age. When a lamp is changed, the distance has
changed or the lamp has aged, the system should be checked to
make certain full erasure is occurring. Incomplete erasure will
cause symptoms that can be misleading. Programmers, components, and even system designs have been erroneously suspected when incomplete erasure was the problem.
MANUFACTURER’S IDENTIFICATION CODE
The NMC27C64 has a manufacturer’s identification code to aid in
programming. The code, shown in Table 2, is two bytes wide and
is stored in a ROM configuration on the chip. It identifies the
manufacturer and the device type. The code for the NMC27C64
is “8FC2”, where “8F” designates that it is made by Fairchild
Semiconductor, and “C2” designates a 64k part.
SYSTEM CONSIDERATION
The power switching characteristics of EPROMs require careful
decoupling of the devices. The supply current, ICC, has three
segments that are of interest to the system designer—the standby
current level, the active current level, and the transient current
peaks that are produced by voltage transitions on input pins. The
magnitude of these transient current peaks is dependent on the
output capacitance loading of the device. The associated VCC
transient voltage peaks can be suppressed by properly selected
decoupling capacitors. It is recommended that at least a 0.1 µF
ceramic capacitor be used on every device between VCC and
GND. This should be a high frequency capacitor of low inherent
inductance. In addition, at least a 4.7 µF bulk electrolytic capacitor
should be used between VCC and GND for each eight devices. The
bulk capacitor should be located near where the power supply is
connected to the array. The purpose of the bulk capacitor is to
overcome the voltage drop caused by the inductive effects of the
PC board traces.
The code is accessed by applying 12V ± 0.5V to address pin A9.
Addresses A1–A8, A10–A12, CE, and OE are held at VIL. Address
A0 is held at VIL for the manufacturer’s code, and at VIH for the
device code. The code is read out on the 8 data pins. Proper code
access is only guaranteed at 25°C ± 5°C.
The primary purpose of the manufacturer’s identification code is
automatic programming control. When the device is inserted in a
EPROM programmer socket, the programmer reads the code and
then automatically calls up the specific programming algorithm for
the part. This automatic programming control is only possible with
programmers which have the capability of reading the code.
ERASURE CHARACTERISTICS
The erasure characteristics of the NMC27C64 are such that
erasure begins to occur when exposed to light with wavelengths
shorter than approximately 4000 Angstroms (Å). It should be
noted that sunlight and certain types of fluorescent lamps have
wavelengths in the 3000Å – 4000Å range.
TABLE 2. Manufacturer’s Identification Code
Pins
A0
(10)
O7
(19)
O6
(18)
O5
(17)
O4
(16)
O3
(15)
O2
(13)
O1
(12)
O0
(11)
Manufacturer Code
VIL
1
0
0
0
1
1
1
1
8F
Device Code
VIH
1
1
0
0
0
0
1
0
C2
9
NMC27C64 Rev. C
Hex
Data
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NMC27C64 65,536-Bit (8192 x 8) CMOS EPROM
Functional Description (Continued)
NMC27C64 65,536-Bit (8192 x 8) CMOS EPROM
Physical Dimensions inches (millimeters) unless otherwise noted
1.260 MAX
(32.00)
24
13
R 0.025
(0.64)
0.514 - 0.526
(13.06 - 13.21)
1
12
0.270 - 0.290
(6.88 - 7.39)
UV WINDOW
R 0.030-0.055 TYP
(0.76 - 1.4)
0.050-0.060 TYP
(1.27 - 1.53)
Glass Sealant
0.590-0.620
(15.03 - 15.79)
0.10
(2.5)
MAX
0.180
(4.59)
MAX
0.225
MAX TYP
(5.73)
0.125 MIN
(3.18)
TYP
0.060-0.100
(1.53 - 2.55)
TYP
0.020 -0.070
(0.51 - 1.78)
TYP
0.090-0.110
(2.29 - 2.80)
TYP
90° - 100°
TYP
0.015-0.021
(0.38 - 0.53)
TYP
0.008-0.015
(0.20 - 0.38)
TYP
0.685
(17.40)
+0.025
(0.64)
-0.060
(-1.523)
Dual-In-Line Package (Q)
Order Number NMC27C64Q
Package Number J28AQ
28 27 26 25 24 23 22 21 20 19 18 17 16 15
0.030
Max
(0.762)
0.600 - 0.620
(15.24 - 15.75)
0.062 RAD
(1.575)
0.510 ±0.005
(12.95 ±0.127)
95° ±5°
0.580
(14.73)
0.008-0.015
(0.229-0.381)
Pin #1
IDENT
1 2 3 4 5 6 7 8 9 10 11 12 13 14
1.393 - 1.420
(35.38 - 36.07)
+0.025
0.625 -0.015
(15.88 +0.635
(
-0.381
0.050
(1.270)
Typ
0.053 - 0.069
(1.346 - 1.753)
0.125-0.165
(3.175-4.191)
0.108 ±0.010
(2.540 ±0.254)
0.050 ±0.015
(1.270 ±0.381)
88° 94°
Typ
0.20 Min
(0.508)
0.125-0.145
(3.175-3.583)
0.018 ±0.003
(0.457 ±0.076)
Dual-In-Line Package (N)
Order Number NMC27C64N
Package Number N28B
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Fairchild's products are not authorized for use as critical components in life support devices or systems without the express written
approval of the President of Fairchild Semiconductor Corporation. As used herein:
1. Life support devices or systems are devices or systems which,
(a) are intended for surgical implant into the body, or (b) support
or sustain life, and whose failure to perform, when properly
used in accordance with instructions for use provided in the
labeling, can be reasonably expected to result in a significant
injury to the user.
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2. A critical component is any component of a life support device
or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system,
or to affect its safety or effectiveness.
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Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and Fairchild reserves the right at any time without notice to change said circuitry and specifications.
10
NMC27C64 Rev. C
www.fairchildsemi.com