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 Ultra Thin Mini-MAP (MLP 2x3), 5-lead SOT23,
8-lead TSSOP and 8-ball dBGA2 Packages
Lead-free/Halogen-free
Available in Automotive
Die Sales: Wafer Form and Tape and Reel
Two-wire
Serial EEPROM
2K (256 x 8)
•
•
•
•
AT24C02B
Not
Recommended
for New Design
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 Ultra Thin 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.
Table 0-1.
Pin Name
A0 - A2
SDA
SCL
WP
GND
VCC
Pin Configuration
Function
Address Inputs
Serial Data
Serial Clock Input
Write Protect
Ground
Power Supply
8-lead Ultra-Thin
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
Note:
For use of 5-lead SOT23, the
software A2, A1, and A0 bits in
5-lead SOT23
the device address word
WP
1
5
must be set to zero to prop-
SCL
erly communicate.
GND
2
SDA
3
4
VCC
8-lead PDIP
A0
A1
A2
GND
1
2
3
4
8
7
6
5
VCC
WP
SCL
SDA
5126H–SEEPR–8/07
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........................................................ 5.0 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 0-1.
Block Diagram
VCC
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
EEPROM
LOAD
DATA WORD
ADDR/COUNTER
Y DEC
SERIAL MUX
D
IN
D
OUT
D
OUT
/ACK
LOGIC
1. 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 sin-
gle 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 connected to ground
2
AT24C02B
5126H–SEEPR–8/07
AT24C02B
(GND). When the write protect pin is connected to V
CC
, the write protection feature is enabled
and operates as shown in
Table 1-1.
Table 1-1.
WP Pin
Status
At V
CC
At GND
Write Protect
Part of the Array Protected
24C02B
Full (2K) Array
Normal Read/Write Operations
2. 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
5126H–SEEPR–8/07
Table 2-1.
Pin Capacitance
(1)
Applicable over recommended operating range from T
A
= 25C, 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 2-2.
DC Characteristics
Applicable over recommended operating range from: T
AI
=
–
40C to +85C, 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.
Table 2-3.
AC Characteristics
Applicable over recommended operating range from T
AI
=
–
40C to +85C, 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
Parameter
Clock Frequency, SCL
Clock Pulse Width Low
Clock Pulse Width High
Noise Suppression Time
Clock Low to Data Out Valid
0.1
1.2
0.6
50
0.9
0.05
Min
Max
400
0.4
0.4
40
0.55
5.0-volt
Min
Max
1000
Units
kHz
µs
µs
ns
µs
4
AT24C02B
5126H–SEEPR–8/07
AT24C02B
Table 2-3.
AC Characteristics
Applicable over recommended operating range from T
AI
=
–
40C to +85C, V
CC
= +1.8V to +5.5V, CL = 1 TTL Gate and
100 pF (unless otherwise noted)
1.8, 2.5, 2.7
Symbol
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)
Note:
Parameter
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, 25C, Byte Mode
0.6
50
5
1 Million
Min
1.2
0.6
0.6
0
100
0.3
300
.25
50
5
Max
5.0-volt
Min
0.5
0.25
0.25
0
100
0.3
100
Max
Units
µs
µs
µs
µs
ns
µs
ns
µs
ns
ms
Write
Cycles
1. This parameter is ensured by characterization only.
5
5126H–SEEPR–8/07
PCB设计
