1
Features
Write Protect Pin for Hardware Data Protection
Utilizes Different Array Protection Compared to the AT24C02/04/08/16
Low-voltage and Standard-voltage Operation
2.7 (V
CC
= 2.7V to 5.5V)
1.8 (V
CC
= 1.8V to 5.5V)
Internally Organized 256 x 8 (2K), 512 x 8 (4K), 1024 x 8 (8K) or 2048 x 8 (16K)
2-wire Serial Interface
Schmitt Trigger, Filtered Inputs for Noise Suppression
Bi-directional Data Transfer Protocol
100 kHz (1.8V, 2.5V, 2.7V) and 400 kHz (5V) Clock Rate for AT24C02A, 04A and 08A
100 kHz (1.8V) and 400 kHz (2.5V, 2.7V and 5V) Clock Rate for AT24C16A
8-byte Page (2K), 16-byte Page (4K, 8K, 16K) Write Modes
Partial Page Writes are Allowed
Self-timed Write Cycle (10 ms Max)
High Reliability
Endurance: One Million Write Cycles
Data Retention: 100 Years
Automotive Grade, Extended Temperature and Lead-Free Devices Available
8-lead PDIP, 8-lead JEDEC SOIC, 8-lead MAP and 8-lead TSSOP Packages
Description
The AT24C02A/04A/08A/16A provides 2048/4096/8192/16384 bits of serial electri-
cally erasable and programmable read only memory (EEPROM) organized as
256/512/1024/2048 words of 8 bits each. The device is optimized for use in many
industrial and commercial applications where low power and low voltage operation are
essential. The AT24C02A/04A/08A/16A is available in space saving 8-lead PDIP,
8-lead JEDEC SOIC, 8-lead MAP and 8-lead TSSOP packages and is accessed via a
2-wire serial interface. In addition, the entire family is available in 2.7V (2.7V to 5.5V)
and 1.8V (1.8V to 5.5V) versions.
2-wire Serial
EEPROM
2K (256 x 8)
4K (512 x 8)
8K (1024 x 8)
16K (2048 x 8)
AT24C02A
AT24C04A
AT24C08A
AT24C16A
Rev. 0976HSEEPR01/03
Pin Configurations
Pin Name
Function
A0 - A2
Address Inputs
SDA
Serial Data
SCL
Serial Clock Input
WP
Write Protect
NC
No-connect
8-lead PDIP
1
2
3
4
8
7
6
5
A0
A1
A2
GND
VCC
WP
SCL
SDA
8-lead SOIC
1
2
3
4
8
7
6
5
A0
A1
A2
GND
VCC
WP
SCL
SDA
8-lead TSSOP
1
2
3
4
8
7
6
5
A0
A1
A2
GND
VCC
WP
SCL
SDA
8-lead MAP
Bottom View
1
2
3
4
8
7
6
5
VCC
WP
SCL
SDA
A0
A1
A2
GND
2
AT24C02A/04A/08A/16A
0976HSEEPR01/03
Block Diagram
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 (A2, A1, A0): The A2, A1 and A0 pins are device
address inputs that must be hard wired for the AT24C02A. As many as eight 2K devices
may be addressed on a single bus system (device addressing is discussed in detail
under the Device Addressing section).
The AT24C04A uses the A2 and A1 inputs for hard wire addressing and a total of four
4K devices may be addressed on a single bus system. The A0 pin is a no-connect.
Absolute Maximum Ratings*
Operating Temperature .................................. -55
C to +125C
*NOTICE:
Stresses beyond those listed under "Absolute
Maximum Ratings" may cause permanent dam-
age 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.
Storage Temperature ..................................... -65
C to +150C
Voltage on Any Pin
with Respect to Ground .....................................-1.0V to +7.0V
Maximum Operating Voltage .......................................... 6.25V
DC Output Current........................................................ 5.0 mA
3
AT24C02A/04A/08A/16A
0976HSEEPR01/03
The AT24C08A only uses the A2 input for hardwire addressing and a total of two 8K
devices may be addressed on a single bus system. The A0 and A1 pins are no-
connects.
The AT24C16A does not use the device address pins, which limits the number of
devices on a single bus to one. The A0, A1 and A2 pins are no-connects.
WRITE PROTECT (WP): The AT24C02A/04A/08A/16A have a Write Protect pin that
provides hardware data protection. The Write Protect pin allows normal read/write oper-
ations 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 in the following
table.
Memory Organization
AT24C02A, 2K SERIAL EEPROM: Internally organized with 32 pages of 8 bytes each,
the 2K requires an 8-bit data word address for random word addressing.
AT24C04A, 4K SERIAL EEPROM: The 4K is internally organized with 32 pages of 16
bytes each. Random word addressing requires a 9-bit data word address.
AT24C08A, 8K SERIAL EEPROM: The 8K is internally organized with 64 pages of 16
bytes each. Random word addressing requires a 10-bit data word address.
AT24C16A, 16K SERIAL EEPROM: The 16K is internally organized with 128 pages of
16 bytes each. Random word addressing requires an 11-bit data word address.
Note:
1. This parameter is characterized and is not 100% tested.
WP Pin Status
Part of the Array Protected
24C02A
24C04A
24C08A
24C16A
At V
CC
Upper Half
(1K) Array
Upper Half
(2K) Array
Full (8K)
Array
Full (16K)
Array
At GND
Normal Read/Write Operations
Pin Capacitance
Applicable over recommended operating range from T
A
= 25
C, f = 1.0 MHz, V
CC
= +1.8V.
Symbol
Test Condition
Max
Units
Conditions
C
I/O
Input/Output Capacitance (SDA)
8
pF
V
I/O
= 0V
C
IN
Input Capacitance (A
0
, A
1
, A
2
, SCL)
6
pF
V
IN
= 0V
4
AT24C02A/04A/08A/16A
0976HSEEPR01/03
Note:
1. V
IL
min and V
IH
max are reference only and are not tested.
DC Characteristics
Applicable over recommended operating range from: T
AI
= -40
C to +85C, V
CC
= +1.8V to +5.5V, T
AE
= -40
C to +125C,
V
CC
= +1.8V to +5.5V (unless otherwise noted).
Symbol
Parameter
Test Condition
Min
Typ
Max
Units
V
CC1
Supply Voltage
1.8
5.5
V
V
CC2
Supply Voltage
2.5
5.5
V
V
CC3
Supply Voltage
2.7
5.5
V
V
CC4
Supply Voltage
4.5
5.5
V
I
CC
Supply Current V
CC
= 5.0V
READ at 100 kHz
0.4
1.0
mA
I
CC
Supply Current V
CC
= 5.0V
WRITE at 100 kHz
2.0
3.0
mA
I
SB1
Standby Current V
CC
= 1.8V
V
IN
= V
CC
or V
SS
0.6
3.0
A
I
SB2
Standby Current V
CC
= 2.5V
V
IN
= V
CC
or V
SS
1.4
4.0
A
I
SB3
Standby Current V
CC
= 2.7V
V
IN
= V
CC
or V
SS
1.6
4.0
A
I
SB4
Standby Current V
CC
= 5.0V
V
IN
= V
CC
or V
SS
8.0
18.0
A
I
LI
Input Leakage Current
V
IN
= V
CC
or V
SS
0.10
3.0
A
I
LO
Output Leakage Current
V
OUT
= V
CC
or V
SS
0.05
3.0
A
V
IL
Input Low Level
(1)
-0.6
V
CC
x 0.3
V
V
IH
Input High Level
(1)
V
CC
x 0.7
V
CC
+ 0.5
V
V
OL2
Output Low Level V
CC
= 3.0V
I
OL
= 2.1 mA
0.4
V
V
OL1
Output Low Level V
CC
= 1.8V
I
OL
= 0.15 mA
0.2
V
5
AT24C02A/04A/08A/16A
0976HSEEPR01/03
Notes:
1. This parameter is characterized and is not 100% tested (T
A
= 25
C).
2. This parameter is characterized and is not 100% tested.
AC Characteristics
Applicable over recommended operating range from T
AI
= -40
C to +85C, T
AE
= -40
C to +125C, V
CC
= +1.8V to +5.5V,
CL = 1 TTL Gate and
100 pF (unless otherwise noted).
Symbol
Parameter
AT24C02A/
04A/08A/16A
1.8V
AT2402A/04A/
08A
2.5V, 2.7V
AT24C16A
2.5V
AT24C02A/
04A/08A/16A
5.0V
Units
Min
Max
Min
Max
Min
Max
Min
Max
f
SCL
Clock Frequency, SCL
100
100
400
400
kHz
t
LOW
Clock Pulse Width Low
4.7
4.7
1.3
1.2
s
t
HIGH
Clock Pulse Width High
4.0
4.0
0.6
0.6
s
t
I
Noise Suppression Time
(1)
100
100
100
50
ns
t
AA
Clock Low to Data Out Valid
0.1
4.5
0.1
4.5
0.2
0.9
0.1
0.9
s
t
BUF
Time the bus must be free before
a new transmission can start
(2)
4.7
4.7
1.3
1.2
s
t
HD.STA
Start Hold Time
4.0
4.0
0.6
0.6
s
t
SU.STA
Start Set-up Time
4.7
4.7
0.6
0.6
s
t
HD.DAT
Data In Hold Time
0
0
0
0
s
t
SU.DAT
Data In Set-up Time
200
200
100
100
ns
t
R
Inputs Rise Time
(2)
1.0
1.0
0.3
0.3
s
t
F
Inputs Fall Time
(2)
300
300
300
300
ns
t
SU.STO
Stop Set-up Time
4.7
4.7
0.6
0.6
s
t
DH
Data Out Hold Time
100
100
100
50
ns
t
WR
Write Cycle Time
10
10
10
10
ms
Endurance
(2)
5.0V, 25
C, Page Mode
1M
1M
1M
1M
Write
Cycles
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