Features
•
Low-voltage and Standard-voltage Operation
– 1.8 (V
CC
= 1.8V to 5.5V)
Internally Organized 256 x 8 (2K)
Two-wire Serial Interface
Schmitt Trigger, Filtered Inputs for Noise Suppression
Bidirectional Data Transfer Protocol
1 MHz (5V), 400 kHz (1.8V, 2.5V, 2.7V) Compatibility
Write Protect Pin for Hardware Data Protection
8-byte Page (2K) Write Modes
Partial Page Writes Allowed
Self-timed Write Cycle (5 ms max)
High-reliability
– Endurance: 1 Million Write Cycles
– Data Retention: 100 Years
•
8-lead PDIP, 8-lead JEDEC SOIC, 8-lead Mini-MAP (MLP 2x3), 5-lead SOT23,
8-lead TSSOP and 8-ball dBGA2 Packages
•
Lead-free/Halogen-free
•
Die Sales: Wafer Form, Waffle Pack and Bumped Wafers
•
•
•
•
•
•
•
•
•
•
Two-wire
Serial EEPROM
2K (256 x 8)
Description
The AT24C02B provides 2048
bits
of serial electrically erasable
and
programmable
read-only memory (EEPROM) organized
as
256 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 AT24C02B is
available
in space-saving
8-lead
PDIP,
8-lead
JEDEC
SOIC, 8-lead
Mini-MAP (MLP 2x3)
,
5-lead
SOT23, 8-lead
TSSOP,
and 8-ball
dBGA2 packages
and
is
accessed
via
a
Two-wire serial interface.
In
addition,
the AT24C02B is
available
in 1.8V (1.8V to 5.5V) version.
AT24C02B
Table 1.
Pin Configuration
Pin Name
A0 - A2
SDA
SCL
WP
NC
GND
VCC
Function
Address Inputs
Serial
Data
Serial
Clock Input
Write Protect
No Connect
Ground
Power
Supply
8-lead Mini-MAP (MLP 2x3)
VCC
WP
SCL
SDA
8
7
6
5
1
2
3
4
A0
A1
A2
GND
8-ball dBGA2
VCC
WP
SCL
SDA
8
7
6
5
1
A0
2
A1
3
A2
4
GND
Bottom View
8-lead TSSOP
A0
A1
A2
GND
1
2
3
4
8
7
6
5
VCC
WP
SCL
SDA
A0
A1
A2
GND
Bottom View
8-lead SOIC
1
2
3
4
8
7
6
5
VCC
WP
SCL
SDA
5-lead SOT23
SCL
GND
SDA
1
2
3
4
VCC
5
WP
A0
A1
A2
GND
8-lead PDIP
1
2
3
4
8
7
6
5
VCC
WP
SCL
SDA
5126B–SEEPR–10/05
1
Absolute Maximum Ratings
Operating Temperature..................................–55°C to +125°C
Storage
Temperature .....................................–65°C to +150°C
Voltage on Any Pin
with Respect to Ground .................................... –1.0V to +7.0V
Maximum Operating Voltage .......................................... 6.25V
DC Output Current........................................................ 5.0 mA
*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.
Figure 1.
Block Diagram
2
AT24C02B
5126B–SEEPR–10/05
AT24C02B
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
are
hard wired for the AT24C02B. 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).
WRITE PROTECT (WP):
The AT24C02B has
a
write protect pin that provides hardware
data protection. The write protect pin
allows
normal read/write operations when con-
nected to ground (GND). When the write protect pin is connected to V
CC
, the write
protection feature is enabled
and
operates
as
shown in Table 2.
Table 2. Write Protect
Part of the Array Protected
WP Pin
Status
At V
CC
At GND
24C02B
Full (2K) Array
Normal Read/Write Operations
Memory Organization
AT24C02B, 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.
3
5126B–SEEPR–10/05
Table 3.
Pin Capacitance
(1)
Applicable over recommended operating range from T
A
= 25°C, f = 1.0 MHz, V
CC
= +1.8V
Symbol
C
I/O
C
IN
Note:
Test Condition
Input/Output Capacitance (SDA)
Input Capacitance (A
0
, A
1
, A
2
,
SCL)
1. This parameter is characterized
and
is not 100% tested.
Max
8
6
Units
pF
pF
Conditions
V
I/O
= 0V
V
IN
= 0V
Table 4.
DC Characteristics
Applicable over recommended operating range from: T
AI
=
–
40°C to +85°C, V
CC
= +1.8V to +5.5V, V
CC
= +1.8V to +5.5V
(unless otherwise noted)
Symbol
V
CC1
V
CC2
V
CC3
V
CC4
I
CC
I
CC
I
SB1
I
SB2
I
SB3
I
SB4
I
LI
I
LO
V
IL
V
IH
V
OL2
V
OL1
Note:
Parameter
Supply
Voltage
Supply
Voltage
Supply
Voltage
Supply
Voltage
Supply
Current V
CC
= 5.0V
Supply
Current V
CC
= 5.0V
Standby
Current V
CC
= 1.8V
Standby
Current V
CC
= 2.5V
Standby
Current V
CC
= 2.7V
Standby
Current V
CC
= 5.0V
Input Leakage Current
Output Leakage Current
Input Low Level
(1)
Input High Level
(1)
Output Low Level V
CC
=
3.0V
Output Low Level V
CC
= 1.8V
I
OL
= 2.1 mA
I
OL
= 0.15 mA
READ
at
100 kHz
WRITE
at
100 kHz
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
IN
= V
CC
or V
SS
V
OUT
= V
CC
or V
SS
–0.6
V
CC
x 0.7
Test Condition
Min
1.8
2.5
2.7
4.5
0.4
2.0
0.6
1.4
1.6
8.0
0.10
0.05
Typ
Max
5.5
5.5
5.5
5.5
1.0
3.0
3.0
4.0
4.0
18.0
3.0
3.0
V
CC
x 0.3
V
CC
+ 0.5
0.4
0.2
Units
V
V
V
V
mA
mA
µA
µA
µA
µA
µA
µA
V
V
V
V
1. V
IL
min
and
V
IH
max
are
reference only
and are
not tested.
4
AT24C02B
5126B–SEEPR–10/05
AT24C02B
Table 5.
AC Characteristics
Applicable over recommended operating range from T
AI
=
–
40°C to +85°C, V
CC
= +1.8V to +5.5V, CL = 1 TTL Gate
and
100 pF (unless otherwise noted)
1.8, 2.5, 2.7
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)
Notes:
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
5.0V, 25°C, Byte Mode
1M
0.6
50
5
0.1
1.2
0.6
0.6
0
100
0.3
300
.25
50
5
1.2
0.6
50
0.9
0.05
0.5
0.25
0.25
0
100
0.3
100
Min
Max
400
0.4
0.4
40
0.55
5.0-volt
Min
Max
1000
Units
kHz
µs
µs
ns
µs
µs
µs
µs
µs
ns
µs
ns
µs
ns
ms
Write
Cycles
1. This parameter is ensured
by
characterization only.
5
5126B–SEEPR–10/05
51mcu
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