Fairchild FM27C256 service manual
January 2000
FM27C256
262,144-Bit (32K x 8) High Performance CMOS EPROM
FM27C256 262,144-Bit (32K x 8) High Performance CMOS EPROM
General Description
The FM27C256 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 FM27C256 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 FM27C256 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 FM27C256 is configured in the standard EPROM pinout
which provides an easy upgrade path for systems which are
currently using standard EPROMs.
Block Diagram
V
CC
GND
V
PP
OE
CE/PGM
Output Enable
and Chip Enable Logic
The FM27C256 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
Data Outputs O0 - O
Output
Buffers
7
A0 - A
Address
Inputs
© 1998 Fairchild Semiconductor Corporation
FM27C256
1
. . . . . . . . .
Y Gating
DS800034-1
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Y Decoder
14
X Decoder
Connection Diagrams
27C040 27C040
XX/V
A
16
A
15
A
12
A
7
A
6
A
5
A
4
A
3
A
2
A
1
A
0
O
0
O
1
O
2
GND
27C512 27C512
27C010 27C010
XX/V
PP
PP
A
16
A
15
A
12
A
A
A
A
A
A
A
A
O
O
O
GND
7
6
5
4
3
2
1
0
0
1
2
A
15
A
12
A
7
A
6
A
5
A
4
A
3
A
2
A
1
A
0
O
O
O
GND
V
PP
A
12
A
A
A
A
A
A
A
A
O
0
O
1
O
2
GND
FM27C256
1
2
3
7
4
6
5
5
6
4
7
3
8
2
9
1
10
0
11
0
12
1
13
2
14
DlP
28
V
CC
27
A
14
26
A
13
25
A
8
24
A
9
23
A
11
22
OE
21
A
10
20
CE/PGM
19
O
7
18
O
6
17
O
5
16
O
4
15
O
3
V
CC
A
14
A
13
A
8
A
9
A
11
OE/V
PP
A
10
CE/PGM
O
7
O
6
O
5
O
4
O
3
V
CC
XX/PGM
XX
A
14
A
13
A
8
A
9
A
11
OE
A
10
CE
O
7
O
6
O
5
O
4
O
3
V
CC
A
18
A
17
A
14
A
13
A
8
A
9
A
11
OE
A
10
CE/PGM
O
7
O
6
O
5
O
4
O
3
FM27C256 262,144-Bit (32K x 8) High Performance CMOS EPROM
Note: Compatible EPROM pin configurations are shown in the blocks adjacent to the FM27C256 pins.
Commercial Temp. Range (0°C to +70°C)
VCC = 5V ±10%
Parameter/Order Number Access Time (ns)
FM27C256 Q, N, V 90 90
FM27C256 Q, N, V 120 120
FM27C256 Q, N, V 150 150
Extended Temp. Range (-40°C to +85°C)
VCC = 5V ±10%
Parameter/Order Number Access Time (ns)
FM27C256 QE, NE, VE 120 120
FM27C256 QE, NE, VE 150 150
Note: Surface mount PLCC package available for commercial and extended
temperature ranges only.
Package Types: FM27C256 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
VCCA14A
13
29
28
27
26
25
24
23
22
21
A
A
A
A
A
A
A
XX
O
A7A12VPPXX
4 3 2 1 32 31 30
5
6
6
5
7
4
8
3
9
2
10
1
11
0
12
13
0
14 15 16 17 18 19 20
DS800034-2
A
8
A
9
A
11
XX
OE
A
10
CE/PGM
O
7
O
6
FM27C256
GND
XX
3O4O5
O
DS800034-3
O1O
2
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2
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FM27C256 262,144-Bit (32K x 8) High Performance CMOS EPROM
Absolute Maximum Ratings (Note 1)
Storage Temperature -65°C to +150°C
ESD Protection > 2000V
All Output Voltages with
Respect to Ground VCC + 1.0V to GND -0.6V
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
Operating Range
Range Temperature V
Comm’l0°C to +70°C +5V ±10%
Industrial -40°C to +85°C +5V ±10%
Read Operation
DC Electrical Characteristics Over Operating Range with V
Symbol Parameter Test Conditions Min Max Units
V
IL
V
IH
V
OL
V
OH
I
SB1
(Note 11) (CMOS)
I
SB2
I
CC1
I
PP
V
PP
I
LI
I
LO
Input Low Level -0.5 0.8 V
Input High Level 2.0 VCC +1 V
Output Low Voltage IOL = 2.1 mA 0.4 V
Output High Voltage IOH = -2.5 mA 3.5 V
VCC Standby Current CE = VCC ±0.3V 100 µA
VCC Standby Current (TTL) CE = V
IH
VCC Active Current CE = OE = VIL,f=5 MHz 35 mA
TTL Inputs Inputs = VIH or VIL, I/O = 0 mA
VPP Supply Current VPP = V
CC
VPP Read Voltage VCC - 0.7 V
Input Load Current VIN = 5.5V or GND -1 1 µA
Output Leakage Current V
= 5.5V or GND -10 10 µA
OUT
PP
= V
CC
1mA
10 µA
CC
CC
V
AC Electrical Characteristics Over Operating Range with V
PP
= V
CC
Symbol Parameter 90 100 120 150 200 Units
Min Max Min Max Min Max Min Max Min Max
t
ACC
t
CE
t
OE
t
DF
(Note 2) Output Float
t
OH
(Note 2) Addresses,
Capacitance (Note 2) T
Address to Output Delay
90 100 120 150 200 ns
CE to Output Delay 90 100 120 150 200
OE to Output Delay 35 50 50 50 50
Output Disable to 30 30 35 45 45
Output Hold from 00000
CE or OE, Whichever
Occurred First
= +25˚C, f = 1 MHz
A
Symbol Parameter Conditions Typ Max Units
C
IN
C
OUT
Input Capacitance VIN = 0V 6 12 pF
Output Capacitance V
= 0V 9 12 pF
OUT
FM27C256
3
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