Atmel AT24C01C and AT24C02C
I
2
C-Compatible (2-wire) Serial EEPROM
1-Kbit (128 x 8), 2-Kbit (256 x 8)
DATASHEET
Features
Low-voltage operation
V
CC
= 1.7V to 5.5V
Internally organized as 128 x 8 (1K) or 256 x 8 (2K)
I
2
C compatible (2-wire) serial interface
Schmitt Trigger, filtered inputs for noise suppression
Bidirectional data transfer protocol
400kHz (1.7V) and 1MHz (2.5V, 2.7V, 5.0V) compatibility
Write Protect pin for hardware data protection
8-byte Page Write mode
Partial page writes allowed
Self-timed write cycle (5ms max)
High-reliability
Endurance: 1,000,000 write cycles
Data retention: 100 years
Green package options (Pb/Halide-free/RoHS-compliant)
8-lead PDIP, 8-lead JEDEC SOIC, 8-lead TSSOP, 8-pad UDFN, 5-lead SOT23,
and 8-ball VFBGA
Die sale options: wafer form and tape and reel available
Description
The Atmel
®
AT24C01C/02C provides 1024/2048-bits of Serial Electrically Erasable and
Programmable Read-Only Memory (EEPROM) organized as 128/256 words of eight
bits each. Both devices include a cascading feature that allows up to eight devices to
share a common 2-wire bus. These devices are optimized for use in many industrial
and commercial applications where low power and low voltage operation are essential.
The AT24C01C/02C are available in space saving 8-lead PDIP, 8-lead JEDEC SOIC,
8-lead TSSOP, 8-lead UDFN
,
5-lead SOT23, and 8-ball VFBGA packages. In addition,
the entire family operates from 1.7V to 5.5V V
CC
.
8700F–SEEPR–6/12
1.
Pin Configurations and Pinouts
Pin Name
A
0
- A
2
SDA
SCL
WP
GND
V
CC
Function
Address Inputs
Serial Data
Serial Clock Input
Write Protect
Ground
Power Supply
A
0
A
1
A
2
GND
8-lead PDIP
1
2
3
4
8
7
6
5
V
CC
WP
SCL
SDA
A
0
A
1
A
2
GND
8-lead SOIC
1
2
3
4
8
7
6
5
(1)
8-lead TSSOP
V
CC
WP
SCL
SDA
A
0
A
1
A
2
GND
1
2
3
4
8
7
6
5
V
CC
WP
SCL
SDA
8-lead UDFN
V
CC
8
WP 7
SCL 6
SDA 5
1 A
0
2 A
1
3 A
2
4 GND
SCL
GND
SDA
5-lead SOT23
1
2
3
4
5
8-ball VFBGA
V
CC
8
WP 7
SCL 6
1 A
0
2 A
1
3 A
2
4 GND
WP
V
CC
SDA 5
Bottom View
Bottom View
Note:
1.
For use of 5-lead SOT23, the software A2, A1, and A0 bits in the device address word must be set to zero to
properly communicate.
2.
Absolute Maximum Ratings
Operating Temperature ........................–55C to +125C
Storage Temperature ...........................–65C to +150C
Voltage on any pin
with respect to ground .............................–1.0V to +7.0V
Maximum Operating Voltage ................................. 6.25V
DC Output Current................................................ 5.0mA
*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 is
not implied. Exposure to absolute maximum
rating conditions for extended periods may affect
device reliability.
Atmel AT24C01C/02C [DATASHEET]
8700F–SEEPR–6/12
2
3.
Block Diagram
V
CC
GND
WP
SCL
SDA
Start
Stop
Logic
LOAD
Device
Address
Comparator
A
2
A
1
A
0
R/W
COMP
Serial
Control
Logic
EN
H.V. Pump/Timing
Data Recovery
INC
X DEC
LOAD
Data Word
Addr/counter
EEPROM
Y DEC
Serial MUX
D
IN
D
OUT
D
OUT
/ACK
Logic
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 bidirectional 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 (A
2
, A
1
, A
0
):
The A
2
, A
1
, and A
0
pins are device address inputs that are hard wired for the
AT24C01C/02C. As many as eight 1-Kbit or 2-Kbit devices may be addressed on a single bus system. See
Section 7.
“Device Addressing” on page 9
for more details.
Write Protect (WP):
The AT24C01C/02C have a Write Protect pin that provides hardware data protection. The Write
Protect pin allows normal read/write operations when connected to ground (GND). When the Write Protect pin is
connected to V
CC
, the write protection feature is enabled and operates as shown below in
Table 4-1.
Table 4-1.
WP Pin
Status
At V
CC
At GND
Write Protect
Part of the Array Protected
Atmel AT24C01C and AT24C02C
Full (2K) Array
Normal Read/Write Operations
Atmel AT24C01C/02C [DATASHEET]
8700F–SEEPR–6/12
3
5.
Memory Organization
Atmel AT24C01C, 1K Serial EEPROM:
Internally organized with 16 pages of eight bytes each, the 1K requires a 7-bit
data word address for random word addressing.
Atmel AT24C02C, 2K Serial EEPROM:
Internally organized with 32 pages of eight bytes each, the 2K requires an 8-bit
data word address for random word addressing.
Table 5-1.
Pin Capacitance
(1)
Applicable over recommended operating range from T
A
= 25C, f = 1.0MHz, V
CC
= 1.7V to 5.5V
Symbol
C
I/O
C
IN
Test Condition
Input/Output Capacitance (SDA)
Input Capacitance (A
0
, A
1
, A
2
, SCL)
Max
8
6
Units
pF
pF
Conditions
V
I/O
= 0V
V
IN
= 0V
Note:
1.
This parameter is characterized and is not 100% tested.
Table 5-2.
DC Characteristics
Applicable over recommended operating range from: T
AI
= –40°C to +85°C, V
CC
= 1.7V to 5.5V (unless otherwise noted)
Symbol
V
CC1
V
CC2
V
CC3
I
CC1
I
CC2
I
SB1
I
SB2
I
SB3
I
LI
I
LO
V
IL
V
IH
V
OL1
V
OL2
Parameter
Supply Voltage
Supply Voltage
Supply Voltage
Supply Current V
CC
= 5.0V
Supply Current V
CC
= 5.0V
Standby Current V
CC
= 1.7V
Standby Current V
CC
= 2.5V
Standby Current V
CC
= 5.5V
Input Leakage Current
Output Leakage Current
Input Low Level
(1)
Input High Level
(1)
Output Low Level V
CC
= 1.7V
Output Low Level V
CC
= 3.0V
I
OL
= 0.15mA
I
OL
= 2.1mA
Read at 400kHz
Write at 400kHz
V
IN
= V
CC
or V
SS
V
IN
= V
CC
or V
SS
V
IN
= V
CC
or V
SS
V
IN
= V
CC
or V
SS
V
OUT
= V
CC
or V
SS
–0.6
V
CC
x 0.7
0.10
0.05
Test Condition
Min
1.7
2.5
4.5
0.4
2.0
Typ
Max
5.5
5.5
5.5
1.0
3.0
1.0
2.0
6.0
3.0
3.0
V
CC
x 0.3
V
CC
+ 0.5
0.2
0.4
Units
V
V
V
mA
mA
μA
μA
μA
μA
μA
V
V
V
V
Note:
1.
V
IL
min and V
IH
max are reference only and are not tested.
Atmel AT24C01C/02C [DATASHEET]
8700F–SEEPR–6/12
4
Table 5-3.
AC Characteristics
Applicable over recommended operating range from T
AI
=
–
40C to +85C, V
CC
= 1.7V to 5.5V, CL = 1TTL Gate and
100pF (unless otherwise noted). Test conditions are listed in
Note 2.
1.7V
Symbol
f
SCL
t
LOW
t
HIGH
t
I
t
AA
t
BUF
t
HD.STA
t
SU.STA
t
HD.DAT
t
SU.DAT
t
R
t
F
t
SU.STO
t
DH
t
WR
Endurance
(1)
Parameter
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
3.3V, +25C, Page Mode
0.6
50
5
1,000,000
0.1
1.2
0.6
0.6
0
100
0.3
300
.25
50
5
1.2
0.6
100
0.9
0.05
0.5
0.25
0.25
0
100
0.3
100
Min
Max
400
0.4
0.4
50
0.55
2.5V,5.0V
Min
Max
1000
Units
kHz
μs
μs
ns
μs
μs
μs
μs
μs
ns
μs
ns
μs
ns
ms
Write Cycles
Note:
1.
2.
This parameter is ensured by characterization only.
AC measurement conditions:
R
L
(connects to V
CC
): 1.3 k (2.5V, 5V), 10 k (1.7V)
Input pulse voltages: 0.3 V
CC
to 0.7 V
CC
Input rise and fall times:
50ns
Input and output timing reference voltages: 0.5 V
CC
Atmel AT24C01C/02C [DATASHEET]
8700F–SEEPR–6/12
5
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