FM24C256A
2-Wire Serial EEPROM
Data Sheet
Oct. 2016
FM24C256A 2-Wire Serial EEPROM
Ver 1.3
Data Sheet
1
INFORMATION IN THIS DOCUMENT IS INTENDED AS A REFERENCE TO ASSIST OUR CUSTOMERS IN THE SELECTION OF
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THEY DO NOT CONVEY ANY LICENSE UNDER ANY INTELLECTUAL PROPERTY RIGHTS, OR ANY OTHER RIGHTS,
BELONGING TO SHANGHAI FUDAN MICROELECTRONICS GROUP CO., LTD OR A THIRD PARTY.
WHEN USING THE INFORMATION CONTAINED IN THIS DOCUMENTS, PLEASE BE SURE TO EVALUATE ALL INFORMATION
AS A TOTAL SYSTEM BEFORE MAKING A FINAL DECISION ON THE APPLICABILITY OF THE INFORMATION AND PRODUCTS.
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OR USE OF THE SHANGHAI FUDAN MICROELECTRONICS GROUP CO., LTD PRODUCTS AND SERVICES DESCRIBED
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Trademarks
Shanghai Fudan Microelectronics Group Co., Ltd name and logo, the “复旦” logo are trademarks or registered trademarks of
Shanghai Fudan Microelectronics Group Co., Ltd or its subsidiaries in China.
Shanghai Fudan Microelectronics Group Co., Ltd, Printed in the China, All Rights Reserved.
FM24C256A 2-Wire Serial EEPROM
Ver 1.3
Data Sheet
2
Description
Packaging Type
The FM24C256A provides 262,144 bits of serial electrically
erasable and programmable read-only memory (EEPROM)
organized as 32,768 words of 8 bits each. The device’s
cascadable feature allows up to 8 devices to share a common
2-wire bus. The device is optimized for use in many industrial
and commercial applications where low-power and low-voltage
operations are essential.
Features
z
z
z
z
z
z
z
z
z
z
z
z
Low Operation Voltage: VCC = 1.7V to 5.5V
Internally Organized: 32,768 x 8
2-wire Serial Interface
Schmitt Trigger, Filtered Inputs for Noise
Suppression
Bi-directional Data Transfer Protocol
1MHz (2.5V, 5.5V) and 400 kHz (1.7V) Compatibility
Write Protect Pin for Hardware Data Protection
64-byte Page Write Modes (Partial Page Writes are
Allowed)
Self-timed Write Cycle (5 ms max)
High-reliability
– Endurance: 1,000,000 Write Cycles
– Data Retention: 40 Years
PDIP8 Package (RoHS Compliant)
SOP8, TSSOP8, MSOP8, TDFN8 Packages (RoHS
Compliant and Halogen-free)
Absolute Maximum Ratings
Operating Temperature
(Plastic Package)
Operating Temperature
(Module Package)
Storage Temperature
(Plastic Package)
Storage Temperature
(Module Package)
Voltage on Any Pin with Respect
to Ground
Maximum Operating Voltage
DC Output Current
-55°C to +125°C
-20°C to +60°C
Pin Configurations
-65°C to +150°C
-25°C to +70°C
-1.0V to +7.0V
6.25V
5.0 mA
*NOTICE: Stresses beyond 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 beyond those indicated in the operational
sections of this specification are not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device
reliability.
FM24C256A 2-Wire Serial EEPROM
Ver 1.3
Pin Name
Function
A0~A2
SDA
SCL
WP
VCC
GND
NC
Device Address Inputs
Serial Data Input/Output
Serial Clock Input
Write Protect
Power Supply
Ground
Not Connect
Data Sheet
3
Figure 1．Block Diagram
FM24C256A 2-Wire Serial EEPROM
Ver 1.3
Data Sheet
4
Pin Description
SERIAL CLOCK (SCL): The SCL input is used to
positive edge clock data into each EEPROM device
and negative edge clock data out of each device.
SERIAL DATA (SDA): The SDA pin is bi-directional
for serial data transfer. This pin is open-drain driven
and may be wire-ORed with any number of other
open-drain or open-collector devices.
DEVICE/PAGE ADDRESSES (A2, A1, A0): The A2,
A1 and A0 pins are device address inputs that are
hardwired or left not connected for hardware
compatibility with other FM24CXX devices. When
the pins are hardwired, as many as eight 256K devices
may be addressed on a single bus system (device
addressing is discussed in detail under the Device
Addressing section). If the pins are left floating, the
A2, A1 and A0 pins will be internally pulled down to
GND if the capacitive coupling to the circuit board
VCC plane is 3pF, FMSH
recommends connecting the address pins to GND.
WRITE PROTECT (WP): The FM24C256A has a Write
Protect pin that provides hardware data protection.
The WP pin allows normal write operations when
connected to ground (GND). When the Write
Protect pin is connected to VCC, all write operations
to the memory are inhibited.
Write Protect Description
WP Pin Status
Part of the Memory Protected
FM 24C256A
WP=VCC
WP=GND
Full (256K) Memory
Normal Read/Write Operations
Memory Organization
FM24C256A, 256K SERIAL EEPROM: Internally organized with 512 pages of 64 bytes each. Random
word addressing requires a 15-bit data word address.
FM24C256A 2-Wire Serial EEPROM
Ver 1.3
Data Sheet
5
Pin Capacitance
SYMBOL
CIN(1)
COUT(1)
PARAMETER
Input Capacitance
Output Capacitance
CONDITIONS
Max
Units
VIN = 0V, f = 1MHz
VOUT = 0V, f = 1MHz
6
8
pF
pF
Note: 1. This parameter is characterized and is not 100% tested.
DC Characteristics
Applicable over recommended operating range from: TA = -40°C to +85°C, VCC = +1.7V to +5.5V, (unless
otherwise noted).
Symbol
Parameter
VCC
ICC1
ICC2
ISB1
ISB2
ILI
ILO
VIL1
VIH1
VOL2
VOL1
Supply Voltage
Supply Current
Supply Current
Standby Current
Standby Current
Input Leakage Current
Output Leakage Current
Input Low Level
Input High Level
Output Low Level 2
Output Low Level 1
Test Condition
Min
Typ
1.7
VCC = 5.0V, Read at 400KHz
VCC = 5.0V, Write at 400KHz
VCC = 1.7V, VIN = VCC/ VSS
VCC = 5.5V, VIN = VCC/ VSS
VIN = VCC/VSS
VOUT = VCC/ VSS
0.4
2.0
0.10
0.05
-0.6
VCC x 0.7
VCC = 3.0V, IOL = 2.1 mA
VCC =1.7V, IOL = 0.15 mA
Max
Units
5.5
1.0
3.0
1.0
6.0
3.0
3.0
VCC x 0.3
VCC + 0.5
0.4
0.2
V
mA
mA
µA
µA
µA
µA
V
V
V
V
Note: 1. VIL min and VIH max are reference only and are not tested.
FM24C256A 2-Wire Serial EEPROM
Ver 1.3
Data Sheet
6
AC Characteristics
Applicable over recommended operating range from: TA = -40°C to +85°C, VCC = +1.7V to +5.5V, CL =
100 pF (unless otherwise noted). Test conditions are listed in Note 2.
Symbol
Parameter
fSCL
tLOW
tHIGH
tI 1
tAA
Clock Frequency, SCL
Clock Pulse Width Low
Clock Pulse Width High
Noise Suppression Time
Clock Low to Data Out Valid
Time the bus must be free before
a new transmission can Start
Start Hold Time
Start Setup Time
Data In Hold Time
Data In Setup Time
Inputs Rise Time 1
Inputs Fall Time 1
Stop Setup Time
Data Out Hold Time
Write Cycle Time
tBUF 1
tHD.STA
tSU.STA
tHD.DAT
tSU.DAT
tR
tF
tSU.STO
tDH
tWR
1.7-volt
Min
Max
2.5-volt
Min
Max
5.5-volt
Min
Max
400
1000
1000
1.3
0.6
0.05
0.40
0.40
100
0.9
0.05
0.4
0.4
50
0.55
0.05
50
0.55
Units
kHz
µs
µs
ns
µs
1.3
0.5
0.5
µs
0.6
0.6
0
100
0.25
0.25
0
100
0.25
0.25
0
100
µs
µs
µs
ns
µs
ns
µs
ns
ms
Write
Cycles
0.3
300
0.6
50
0.3
100
0.25
50
5
Endurance 1 3.3V, 25°C, Page Mode
0.25
50
5
1,000,000
0.3
100
5
Notes: 1. This parameter is characterized and is not 100% tested.
2. AC measurement conditions:
RL (connects to VCC): 1.3 kΩ
Input pulse voltages: 0.3 VCC to 0.7 VCC
Input rise and fall times: ≤ 50 ns
Input and output timing reference voltages: 0.5 VCC
FM24C256A 2-Wire Serial EEPROM
Ver 1.3
Data Sheet
7
Device Operation
CLOCK and DATA TRANSITIONS: The SDA pin is
normally pulled high with an external device. Data on
the SDA pin may change only during SCL low time
periods (refer to Figure 4). Data changes during
SCL high periods will indicate a start or stop
condition as defined below.
START CONDITION: A high-to-low transition of SDA
with SCL high is a start condition which must
precede any other command (refer to Figure 5).
STOP CONDITION: A low-to-high transition of SDA
with SCL high is a stop condition. After a read
sequence, the stop command will place the EEPROM
in a standby power mode (refer to Figure 5).
ACKNOWLEDGE: All address and data words are
serially transmitted to and from the EEPROM in 8-bit
words. The EEPROM sends a zero during the ninth
clock cycle to acknowledge that it has received
each word.
STANDBY MODE: The FM24C256A features a
low-power standby mode which is enabled: (a)
upon power-up and (b) after the receipt of the stop
bit and the completion of any internal operations.
Memory RESET: After an interruption in protocol,
power loss or system reset, any 2-wire part can be
reset in following these steps:
1. Clock up to 9 Cycles,
2. Look for SDA high in each cycle while SCL is
high and then,
3. Create a start condition as SDA is high.
Bus Timing
Figure 2．SCL: Serial Clock, SDA: Serial Data I/O
tHIGH
tF
tLOW
SCL
tSU.STA
tHD.STA
tR
tLOW
tHD.DAT
tSU.DAT
tSU.STO
SDA
IN
tAA
tDH
tBUF
SDA
OUT
FM24C256A 2-Wire Serial EEPROM
Ver 1.3
Data Sheet
8
Write Cycle Timing
Figure 3．SCL: Serial Clock, SDA: Serial Data I/O
Note: 1. The write cycle time tWR is the time from a valid stop condition of a write sequence to the end of the
internal clear/write cycle.
Figure 4．Data Validity
Figure 5．Start and Stop Definition
SDA
SCL
START
FM24C256A 2-Wire Serial EEPROM
STOP
Ver 1.3
Data Sheet
9
Figure 6．Output Acknowledge
Device Addressing
The 256K EEPROM device requires a 8-bit device
address word following a start condition to enable
the chip for a read or write operation (refer to
Figure 7).
The eighth bit of the device address is the
read/write operation select bit. A read operation is
initiated if this bit is high and a write operation is
initiated if this bit is low.
The device address word consists of a mandatory
one, zero sequence for the first four most
significant bits as shown. This is common to all the
EEPROM devices.
Upon a compare of the device address, the
EEPROM will output a zero. If a compare is not
made, the device will return to a standby state.
The 256K EEPROM uses the three device address
bits A2, A1, A0 to allow as many as eight devices on
the same bus. These bits must compare to their
corresponding hard-wired input pins. The A2, A1
and A0 pins use an internal proprietary circuit that
biases them to a logic low condition if the pins are
allowed to float.
NOISE PROTECTION: Special internal circuitry
placed on the SDA and SCL pins prevent small
noise spikes from activating the device.
DATA SECURITY: The FM24C256A has a
hardware data protection scheme that allows the
user to write protect the entire memory when the
WP pin is at VCC.
The Module package device address word also
consists of a mandatory one, zero sequence for
the first four most significant bits. The next 3 bits
are all zero.
FM24C256A 2-Wire Serial EEPROM
Ver 1.3
Data Sheet
10
Write Operations
Read Operations
BYTE WRITE: A write operation requires two 8-bit
data word address following the device address
word and acknowledgment. Upon receipt of this
address, the EEPROM will again respond with a
zero and then clock in the first 8-bit data word.
Following receipt of the 8-bit data word, the
EEPROM will output a zero and the addressing
device, such as a microcontroller, must terminate
the write sequence with a stop condition. At this
time the EEPROM enters an internally-timed write
cycle, tWR, to the nonvolatile memory. All inputs are
disabled during this write cycle and the EEPROM
will not respond until the write is complete (refer to
Figure 8).
Read operations are initiated the same way as write
operations with the exception that the read/write
select bit in the device address word is set to one.
There are three read operations: current address
read, random address read and sequential read.
PAGE WRITE: The 256K EEPROM is capable of
64-byte page writes.
A page write is initiated the same way as a byte
write, but the microcontroller does not send a stop
condition after the first data word is clocked in.
Instead, after the EEPROM acknowledges receipt
of the first data word, the microcontroller can
transmit up to 63 more data words. The EEPROM
will respond with a zero after each data word
received. The microcontroller must terminate the
page write sequence with a stop condition (refer to
Figure 9).
The data word address lower six bits are internally
incremented following the receipt of each data word.
The higher data word address bits are not
incremented, retaining the memory page row
location. When the word address, internally
generated, reaches the page boundary, the
following byte is placed at the beginning of the
same page. If more than 64 data words are
transmitted to the EEPROM, the data word address
will “roll over” and previous data will be overwritten.
CURRENT ADDRESS READ: The internal data
word address counter maintains the last address
accessed during the last read or write operation,
incremented by one. This address stays valid
between operations as long as the chip power is
maintained. The address “roll over” during read is
from the last byte of the last memory page to the
first byte of the first page. The address “roll over”
during write is from the last byte of the current
page to the first byte of the same page.
Once the device address with the read/write select
bit set to one is clocked in and acknowledged by
the EEPROM, the current address data word is
serially clocked out. The microcontroller does not
respond with an input zero but does generate a
following stop condition (refer to Figure 10).
RANDOM READ: A random read requires a “dummy”
byte write sequence to load in the data word
address. Once the device address word and data
word address are clocked in and acknowledged by
the EEPROM, the microcontroller must generate
another start condition. The microcontroller now
initiates a current address read by sending a
device address with the read/write select bit high.
The EEPROM acknowledges the device address
and serially clocks out the data word. The
microcontroller does not respond with a zero but
does generate a following stop condition (refer to
Figure 11).
ACKNOWLEDGE POLLING: Once the internally
timed write cycle has started and the EEPROM
inputs are disabled, acknowledge polling can be
initiated. This involves sending a start condition
followed by the device address word. The
read/write bit is representative of the operation
desired. Only if the internal write cycle has
completed will the EEPROM respond with a zero
allowing the read or write sequence to continue.
SEQUENTIAL READ: Sequential reads are initiated
by either a current address read or a random
address read. After the microcontroller receives a
data word, it responds with an acknowledge. As
long as the EEPROM receives an acknowledge, it
will continue to increment the data word address
and serially clock out sequential data words. When
the memory address limit is reached, the data
word address will “roll over” and the sequential
read will continue. The sequential read operation is
terminated when the microcontroller does not
respond with a zero but does generate a following
stop condition (refer to Figure 12).
FM24C256A 2-Wire Serial EEPROM
Ver 1.3
Data Sheet
11
Figure 7．Device Address
MSB
LSB
Plastic
Package
1
0
1
0
A2
A1
A0
R/W
Module
Package
1
0
1
0
0
0
0
R/W
Figure 8．Byte Write
Note: 1. * = Don’t CARE bits
Figure 9．Page Write
Note: 1. * = Don’t CARE bits
FM24C256A 2-Wire Serial EEPROM
Ver 1.3
Data Sheet
12
Figure 10．Current Address Read
Figure 11． Random Read
Note: 1. * = Don’t CARE bits.
Figure 12． Sequential Read
DEVICE
ADDRESS
R
E
A
D
DATA n+1
DATA n
S
T
O
P
DATA(n+x)
DATA n+2
SDA LINE
RA
/ C
WK
FM24C256A 2-Wire Serial EEPROM
A
C
K
A
C
K
Ver 1.3
A
C
K
N
O
A
C
K
Data Sheet
13
Ordering Information
FM 24C 256 A -PP -C -H
Company Prefix
FM = Fudan Microelectronics Group Co.,ltd
Product Family
24C = 2-Wire Serial EEPROM
Product Density
256 = 256K-bit
Supply Voltage
A = 1.7V to 5.5V
Package Type
(1)
M2F or M2P = 8-pin Module Package (2)
PD = 8-pin PDIP
SO = 8-pin SOP
TS = 8-pin TSSOP
MS = 8-Pin MSOP
DN = 8-pin TDFN
Product Carrier
U = Tube
T = Tape and Reel
R = Module Reel
HSF ID Code
(3)
R = RoHS Compliant
G = RoHS Compliant, Halogen-free, Antimony-free
Note:
1. For SO, TS, DN package, MSL1 package are available, for detail please contact local sales office.
2. For the details of Module package please contact local sales office.
3. For PD, M2F, M2P package: R class only.
For SO, TS, MS and DN package: G class only.
FM24C256A 2-Wire Serial EEPROM
Ver 1.3
Data Sheet
14
Part Marking Scheme
PDIP8
SOP8
TSSOP8
FM24C256A 2-Wire Serial EEPROM
Ver 1.3
Data Sheet
15
MSOP8
TDFN8
FM24C256A 2-Wire Serial EEPROM
Ver 1.3
Data Sheet
16
Packaging Information
PDIP 8
Symbol
MIN
‐‐‐
A
A1
0.380
b
0.380
b2
1.300
C
0.200
D
9.000
E1
6.100
E
7.320
e
L
2.920
‐‐‐
eB
NOTE:
1. Dimensions are in Millimeters.
FM24C256A 2-Wire Serial EEPROM
MAX
5.000
--0.570
1.700
0.360
10.000
7.000
8.250
2.540(BSC)
3.810
10.900
Ver 1.3
Data Sheet
17
SOP 8
Symbol
MIN
A
1.350
A1
0.050
b
0.330
c
0.150
D
4.700
E1
3.700
E
5.800
e
L
0.400
θ
0°
NOTE:
1. Dimensions are in Millimeters.
FM24C256A 2-Wire Serial EEPROM
MAX
1.750
0.250
0.510
0.260
5.150
4.100
6.200
1.270(BSC)
1.270
8°
Ver 1.3
Data Sheet
18
TSSOP8
Symbol
MIN
D
2.900
E1
4.300
b
0.190
c
0.090
E
6.200
A
A1
0.050
e
L
0.450
θ
0°
NOTE:
1. Dimensions are in Millimeters.
FM24C256A 2-Wire Serial EEPROM
MAX
3.100
4.500
0.300
0.200
6.600
1.200
0.150
0.650 (BSC)
0.750
8°
Ver 1.3
Data Sheet
19
MSOP8
Symbol
MIN
A
0.820
A1
0.020
b
0.220
c
0.080
D
2.900
e
E
2.900
E1
4.750
L
0.400
θ
0°
NOTE:
1. Dimensions are in Millimeters.
FM24C256A 2-Wire Serial EEPROM
MAX
1.100
0.150
0.380
0.230
3.100
0.650 (BSC)
3.100
5.050
0.800
8°
Ver 1.3
Data Sheet
20
TDFN8
Symbol
MIN
A
0.700
A1
0.000
D
1.900
E
2.900
D2
1.400
E2
1.400
k
b
0.200
e
L
0.200
NOTE:
1. Dimensions are in Millimeters.
FM24C256A 2-Wire Serial EEPROM
MAX
0.800
0.050
2.100
3.100
1.600
1.700
0.150(MIN)
0.300
0.500(TYP)
0.500
Ver 1.3
Data Sheet
21
Revision History
Version
1.0
1.1
Publication
Pages
date
May. 2011
22
Jun. 2011
Paragraph or
Illustration
Revise Description
Initial Document Release.
23
Ordering Information
Part Marking Scheme
Packaging Information
1.2
Apr. 2013
23
Disclaimer
Ordering Information
Part Marking Scheme
Packaging Information
1.3
Oct. 2016
23
Ordering Information
Part Marking Scheme
Packaging Information
FM24C256A 2-Wire Serial EEPROM
Added the MSOP8 packaging type.
1. Modified the Disclaimer.
2. Removed 6-Pin module package offering
3. Updated the “Ordering Information”
4. Updated the “Part Marking Scheme”
5. Updated the “Packaging Information”.
1. Updated the “Ordering Information”
2. Updated the “Part Marking Scheme”
3. Updated the “Packaging Information”.
Ver 1.3
Data Sheet
22
Sales and Service
Shanghai Fudan Microelectronics Group Co., Ltd.
Address: Bldg No. 4, 127 Guotai Rd,
Shanghai City China.
Postcode: 200433
Tel: (86-021) 6565 5050
Fax: (86-021) 6565 9115
Shanghai Fudan Microelectronics (HK) Co., Ltd.
Address: Unit 506, 5/F., East Ocean Centre, 98 Granville
Road, Tsimshatsui East, Kowloon, Hong Kong
Tel: (852) 2116 3288 2116 3338
Fax: (852) 2116 0882
Beijing Office
Address: Room 423, Bldg B, Gehua Building,
1 QingLong Hutong, Dongzhimen Alley north Street,
Dongcheng District, Beijing City, China.
Postcode: 100007
Tel: (86-010) 8418 6608
Fax: (86-010) 8418 6211
Shenzhen Office
Address: Room.1301, Century Bldg, No. 4002, Shengtingyuan
Hotel, Huaqiang Rd (North),
Shenzhen City, China.
Postcode: 518028
Tel: (86-0755) 8335 0911 8335 1011 8335 2011 8335 0611
Fax: (86-0755) 8335 9011
Shanghai Fudan Microelectronics (HK) Ltd Taiwan
Representative Office
Address: Unit 1225, 12F., No 252, Sec.1 Neihu Rd.,
Neihu Dist., Taipei City 114, Taiwan
Tel : (886-2) 7721 1889 (886-2) 7721 1890
Fax: (886-2) 7722 3888
Shanghai Fudan Microelectronics (HK) Ltd
Singapore Representative Office
Address : 237, Alexandra Road, #07-01 The Alexcier,
Singapore 159929
Tel : (65) 6472 3688
Fax: (65) 6472 3669
Shanghai Fudan Microelectronics Group Co., Ltd
NA Office
Address :2490 W. Ray Road Suite#2
Chandler, AZ 85224 USA
Tel : (480) 857-6500 ext 18
Web Site: http://www.fmsh.com/
FM24C256A 2-Wire Serial EEPROM
Ver 1.3
Data Sheet
23
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