1
Features
Low-voltage Operation
2.7 (V
CC
= 2.7V to 5.5V)
Internally Organized 131,072 x 8
2-wire Serial Interface
Schmitt Triggers, Filtered Inputs for Noise Suppression
Bi-directional Data Transfer Protocol
400 kHz (2.7V) and 1 MHz (5V) Clock Rate
Write Protect Pin for Hardware and Software Data Protection
256-byte Page Write Mode (Partial Page Writes Allowed)
Random and Sequential Read Modes
Self-timed Write Cycle (5 ms Typical)
High Reliability
Endurance: 100,000 Write Cycles/Page
Data Retention: 40 Years
8-lead PDIP, 8-lead EIAJ SOIC, 8-lead LAP and 8-ball dBGA
TM
Packages
Description
The AT24C1024 provides 1,048,576 bits of serial electrically erasable and program-
mable read only memory (EEPROM) organized as 131,072 words of 8 bits each. The
device's cascadable feature allows up to 2 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 operation are essential. The devices are available in space-
saving 8-lead PDIP, 8-lead EIAJ SOIC, 8-lead Leadless Array (LAP) and 8-ball dBGA
packages. In addition, the entire family is available in 2.7V (2.7V to 5.5V) versions.
2-wire Serial
EEPROM
1M (131,072 x 8)
AT24C1024
Rev. 1471HSEEPR03/03
Pin Configurations
Pin Name
Function
A1
Address Input
SDA
Serial Data
SCL
Serial Clock Input
WP
Write Protect
NC
No Connect
8-lead PDIP
1
2
3
4
8
7
6
5
NC
A1
NC
GND
VCC
WP
SCL
SDA
8-lead Leadless Array
Bottom View
1
2
3
4
8
7
6
5
VCC
WP
SCL
SDA
NC
A1
NC
GND
8-lead SOIC
1
2
3
4
8
7
6
5
NC
A1
NC
GND
VCC
WP
SCL
SDA
8-ball dBGA
Bottom View
VCC
WP
SCL
SDA
NC
A1
NC
GND
1
2
3
4
8
7
6
5
2
AT24C1024
1471HSEEPR03/03
Block Diagram
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
AT24C1024
1471HSEEPR03/03
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 (A1): The A1 pin is a device address input that can be hard-
wired or left not connected for hardware compatibility with AT24C128/256/512. When the A1
pin is hardwired, as many as two 1024K devices may be addressed on a single bus system
(device addressing is discussed in detail under the Device Addressing section). When the pin
is not hardwired, the default A1 is zero.
WRITE PROTECT (WP): The hardware Write Protect pin is useful for protecting the entire
contents of the memory from inadvertent write operations. The write-protect input, when tied to
GND, allows normal write operations. When WP is tied high to V
CC
, all write operations to the
memory are inhibited. If left unconnected, WP is internally pulled down to GND. Switching WP
to V
CC
prior to a write operation creates a software write-protect function.
Memory
Organization
AT24C1024, 1024K SERIAL EEPROM: The 1024K is internally organized as 512 pages of
256 bytes each. Random word addressing requires a 17-bit data word address.
4
AT24C1024
1471HSEEPR03/03
Pin Capacitance
(1)
Note:
1. This parameter is characterized and is not 100% tested.
DC Characteristics
Note:
1. V
IL
min and V
IH
max are reference only and are not tested.
Applicable over recommended operating range from T
A
= 25
C, f = 1.0 MHz, V
CC
= +2.7V.
Symbol
Test Condition
Max
Units
Conditions
C
I/O
Input/Output Capacitance (SDA)
8
pF
V
I/O
= 0V
C
IN
Input Capacitance (A
1
, SCL)
6
pF
V
IN
= 0V
Applicable over recommended operating range from: T
AI
= -40
C to +85C, V
CC
= +2.7V to +5.5V, T
AC
= 0
C to +70C,
V
CC
= +2.7V to +5.5V (unless otherwise noted).
Symbol
Parameter
Test Condition
Min
Typ
Max
Units
V
CC
Supply Voltage
2.7
5.5
V
I
CC
Supply Current
V
CC
= 5.0V
READ at 400 kHz
2.0
mA
I
CC
Supply Current
V
CC
= 5.0V
WRITE at 400 kHz
5.0
mA
I
SB
Standby Current
V
CC
= 2.7V
V
IN
= V
CC
or V
SS
3.0
A
V
CC
= 5.5V
6.0
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
OL
Output Low Level
V
CC
= 3.0V
I
OL
= 2.1 mA
0.4
V
5
AT24C1024
1471HSEEPR03/03
AC Characteristics
Notes:
1. This parameter is characterized and is not 100% tested.
2. AC measurement conditions:
R
L
(connects to V
CC
): 1.3 k
(2.7V, 5V)
Input pulse voltages: 0.3 V
CC
to 0.7 V
CC
Input rise and fall times:
50 ns
Input and output timing reference voltages: 0.5 V
CC
Applicable over recommended operating range from T
A
= -40
C to +85C, V
CC
= +2.7V to +5.5V, C
L
= 100 pF (unless
otherwise noted). Test conditions are listed in Note 2.
Symbol
Parameter
Test Conditions
Min
Max
Units
f
SCL
Clock Frequency, SCL
4.5V
V
CC
5.5V
2.7V
V
CC
5.5V
1000
400
kHz
t
LOW
Clock Pulse Width Low
4.5V
V
CC
5.5V
2.7V
V
CC
5.5V
0.4
1.3
s
t
HIGH
Clock Pulse Width High
4.5V
V
CC
5.5V
2.7V
V
CC
5.5V
0.4
0.6
s
t
AA
Clock Low to Data Out Valid
4.5V
V
CC
5.5V
2.7V
V
CC
5.5V
0.05
0.05
0.55
0.9
s
t
BUF
Time the bus must be free before a new
transmission can start
(1)
4.5V
V
CC
5.5V
2.7V
V
CC
5.5V
0.5
1.3
s
t
HD.STA
Start Hold Time
4.5V
V
CC
5.5V
2.7V
V
CC
5.5V
0.25
0.6
s
t
SU.STA
Start Setup Time
4.5V
V
CC
5.5V
2.7V
V
CC
5.5V
0.25
0.6
s
t
HD.DAT
Data In Hold Time
0
s
t
SU.DAT
Data In Setup Time
100
ns
t
R
Inputs Rise Time
(1)
0.3
s
t
F
Inputs Fall Time
(1)
4.5V
V
CC
5.5V
2.7V
V
CC
5.5V
100
300
ns
t
SU.STO
Stop Setup Time
4.5V
V
CC
5.5V
2.7V
V
CC
5.5V
0.25
0.6
s
t
DH
Data Out Hold Time
50
ns
t
WR
Write Cycle Time
10
ms
Endurance
(1)
5.0V, 25
C, Page Mode
100K
Write Cycles
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