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FM24C256 – 256K-Bit Standard 2-Wire Bus Interface Serial EEPROM
November 2001
FM24C256 – 256K-Bit Standard 2-Wire Bus
Interface Serial EEPROM
General Description
FM24C256 is a 256Kbit CMOS non-volatile serial EEPROM
organized as 32K x 8 bit memory. This device confirms to
Extended IIC 2-wire protocol that allows accessing of memory in
excess of 16Kbit on an IIC bus. This serial communication protocol
uses a Clock signal (SCL) and a Data signal (SDA) to synchro-
nously clock data between a master (e.g. a microcontroller) and a
slave (EEPROM). FM24C256 is designed to minimize pin count
and simplify PC board layout requirements.
FM24C256 offers hardware write protection where by the entire
memory array can be write protected by connecting WP pin to V
The entire memory then becomes unalterable until the WP pin is
switched to V
SS
.
“LZ” and “L” versions of FM24C256 offer very low standby current
making them suitable for low power applications. This device is
offered in SO and DIP packages.
Fairchild EEPROMs are designed and tested for applications
requiring high endurance, high reliability and low power consump-
tion.
CC
.
Features
I
Extended operating voltage: 2.7V to 5.5V
I
Up to 400 KHz clock frequency at 2.7V to 5.5V
I
Low power consumption
— 0.5mA active current typical
— 10µA standby current typical
— 1µA standby current typical (L version)
— 0.1µA standby current typical (LZ version)
I
Schmitt trigger inputs
I
64 byte page write mode
I
Self timed write cycle (6ms max)
I
Hardware Write Protection for the entire array
I
Endurance: up to 100K data changes
I
Data Retention: Greater than 40 years
I
Packages: 8-Pin DIP and 8-Pin SO
I
Temperature range
— Commercial: 0
°C
to +70°C
— Industrial (E): -40
°C
to +85°C
— Automotive (V): -40
°C
to +125
°C
Block Diagram
VSS
VCC
WP
SDA
START
STOP
LOGIC
CONTROL
LOGIC
SLAVE ADDRESS
REGISTER &
COMPARATOR
E2PROM
ARRAY
WRITE
LOCKOUT
H.V. GENERATION
TIMING &CONTROL
SCL
XDEC
A2
A1
A0
WORD
ADDRESS
COUNTER
R/W
YDEC
CK
DIN
DATA REGISTER
DOUT
© 2001 Fairchild Semiconductor Corporation
FM24C256 Rev. D.1
1
www.fairchildsemi.com
FM24C256 – 256K-Bit Standard 2-Wire Bus Interface Serial EEPROM
Connection Diagram
Dual-in-Line Package (N) and SO Package (M8)
A0
A1
A2
V
SS
1
2
8
7
V
CC
WP
SCL
SDA
FM24C256
3
4
6
5
See Package Number N08E and M08A
Pin Names
V
SS
SDA
SCL
WP
V
CC
A0, A1, A2
Ground
Serial Data I/O
Serial Clock Input
Write Protect
Power Supply
Device Address Inputs
2
FM24C256 Rev. D.1
www.fairchildsemi.com
FM24C256 – 256K-Bit Standard 2-Wire Bus Interface Serial EEPROM
Ordering Information
FM
24
C
XX
F
LZ
E
YY
X
Letter
Blank
X
Package
Temp. Range
N
M8
Blank
E
V
Blank
L
LZ
Blank
F
256
C
Interface
24
FM
Description
Tube
Tape and Reel
8-pin DIP
8-pin SOIC
0 to 70
°C
-40 to +85
°C
-40 to +125
°C
4.5V to 5.5V
2.7V to 5.5V
2.7V to 5.5V and
<1µA Standby Current
100KHz
400KHz
256K with write protect
CMOS
IIC - 2 Wire
Fairchild Non-Volatile
Memory
Voltage Operating Range
SCL Clock Frequency
Density
3
FM24C256 Rev. D.1
www.fairchildsemi.com
FM24C256 – 256K-Bit Standard 2-Wire Bus Interface Serial EEPROM
Product Specifications
Absolute Maximum Ratings
Ambient Storage Temperature
All Input or Output Voltages
with Respect to Ground
Lead Temperature
(Soldering, 10 seconds)
ESD Rating
–65°C to +150
°C
6.5V to –0.3V
+300°C
2000V min.
Operating Conditions
Ambient Operating Temperature
FM24C256
FM24C256E
FM24C256V
Positive Power Supply
FM24C256
FM24C256L
FM24C256LZ
0°C to +70
°C
-40°C to +85
°C
-40°C to +125
°C
4.5V to 5.5V
2.7V to 5.5V
2.7V to 5.5V
Standard V
CC
(4.5V to 5.5V) DC Electrical Characteristics
Symbol
Parameter
Test Conditions
Min
I
CCA
I
SB
I
LI
I
LO
V
IL
V
IH
V
OL
Active Power Supply Current
Standby Current
Input Leakage Current
Output Leakage Current
Input Low Voltage
Input High Voltage
Output Low Voltage
I
OL
= 2.1 mA
f
SCL
= 400 KHz
f
SCL
= 100 KHz
V
IN
= GND or V
CC
V
IN
= GND to V
CC
V
OUT
= GND to V
CC
–0.3
V
CC
x 0.7
Limits
Typ
(Note 1)
0.5
10
0.1
0.1
Units
Max
1.0
50
1
1
V
CC
x 0.3
V
CC
+ 0.5
0.4
mA
µA
µA
µA
V
V
V
Low V
CC
(2.7V to 5 .5V) DC Electrical Characteristics
Symbol
Parameter
Test Conditions
Min
I
CCA
I
SB
(Note 3)
I
LI
I
LO
V
IL
V
IH
V
OL
Active Power Supply Current
Standby Current
f
SCL
= 400 KHz
f
SCL
= 100 KHz
V
IN
= GND
or V
CC
V
CC
= 2.7V - 4.5V (L)
V
CC
= 2.7V - 4.5V (LZ)
V
CC
= 4.5V - 5.5V
Limits
Typ
(Note 1)
0.5
1
0.1
10
0.1
0.1
Units
Max
1.0
10
1
50
1
1
V
CC
x 0.3
V
CC
+ 0.5
0.4
mA
µA
µA
µA
µA
µA
V
V
V
Input Leakage Current
Output Leakage Current
Input Low Voltage
Input High Voltage
Output Low Voltage
V
IN
= GND to V
CC
V
OUT
= GND to V
CC
–0.3
V
CC
x 0.7
I
OL
= 2.1 mA
Capacitance
T
A
= +25°C, f = 100/400 KHz, V
CC
= 5V
(Note 2)
Symbol
C
I/O
C
IN
Test
Input/Output Capacitance (SDA)
Input Capacitance (A0, A1, A2, SCL)
A
= 25°C and nominal supply voltage (5V).
Conditions
V
I/O
= 0V
V
IN
= 0V
Max
8
6
Units
pF
pF
Note 1:
Typical values are T
Note 2:
This parameter is periodically sampled and not 100% tested.
Note 3:
The "L" and "LZ" versions can be operated in the 2.7V to 5.5V V
CC
range. However the I
SB
values for L and LZ are applicable only when V
CC
is in the 2.7V to 4.5V range.
4
FM24C256 Rev. D.1
www.fairchildsemi.com
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