AT24C01ASC/02SC/04SC/08SC/16SC - Datasheet

Features
• Low-voltage and Standard-voltage Operation, VCC = 2.7V–5.5V
• Internally Organized 128 x 8 (1K), 256 x 8 (2K), 512 x 8 (4K),
•
•
•
•
•
•
•
•
1024 x 8 (8K), or 2048 x 8 (16K)
Two-wire Serial Interface
Schmitt Trigger, Filtered Inputs for Noise Suppression
Bidirectional Data Transfer Protocol
400 kHz Compatibility
8-byte Page (1K, 2K), 16-byte Page (4K, 8K, 16K) Write Modes
Partial Page Writes Allowed
Self-timed Write Cycle (5 ms max)
High Reliability
– Endurance: One Million Write Cycles
– Data Retention: 100 Years
– ESD Protection: >3000V
Description
The AT24C01A/02SC/04SC/08SC/16SC provide 1024/2048/4096/8192/16384 bits of
serial, electrically-erasable, and programmable read-only memory (EEPROM) organized as 128/256/512/1024/2048 words of 8 bits each. The devices are optimized for
use in smart card applications where low-power and low-voltage operation may be
essential. The devices are available in several standard ISO 7816 smart card modules
(see Ordering Information, pages 12–13). All devices are functionally equivalent to
Atmel serial EEPROM products offered in standard IC packages (PDIP, SOIC, TSSOP,
MAP), with the exception of the slave address and write protect functions, which are
not required for smart card applications.
Table 1. Pin Configuration
Pad Name
Description
ISO Module Contact
VCC
Power Supply Voltage
C1
GND
Ground
C5
SCL
Serial Clock Input
C3
SDA
Serial Data Input/Output
C7
NC
No Connect
C2, C4, C6, C8
Two-wire Serial
EEPROM Smart
Card Modules
1K (128 x 8)
2K (256 x 8)
4K (512 x 8)
8K (1024 x 8)
16K (2048 x 8)
AT24C01ASC
AT24C02SC
AT24C04SC
AT24C08SC
AT24C16SC
Figure 1. Card Module Contact
VCC
NC
1610B–SEEPR–04/04
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
*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.
DC Output Current........................................................ 5.0 mA
Figure 2. 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 opencollector devices.
Memory Organization
AT24C01ASC, 1K SERIAL EEPROM: Internally organized with 16 pages of 8 bytes
each, the 1K requires a 7-bit data word address for random word addressing.
AT24C02SC, 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.
2
AT24C01ASC/02SC/04SC/08SC/16SC
1610B–SEEPR–04/04
AT24C01ASC/02SC/04SC/08SC/16SC
AT24C04SC, 4K SERIAL EEPROM: Internally organized with 32 pages of 16 bytes
each, the 4K requires a 9-bit data word address for random word addressing.
AT24C08SC, 8K SERIAL EEPROM: Internally organized with 64 pages of 16 bytes
each, the 8K requires a 10-bit data word address random word addressing.
AT24C16SC, 16K SERIAL EEPROM: Internally organized with 128 pages of 16 bytes
each, the 16K requires an 11-bit data word address random word addressing.
Pin Capacitance
Table 2. Pin Capacitance (1)
Applicable over recommended operating range from TA = 25°C, f = 1.0 MHz, V CC = +2.7V
Symbol
Test Condition
CI/O
CIN
Note:
Max
Units
Conditions
Input/Output Capacitance (SDA)
8
pF
VI/O = 0V
Input Capacitance (SCL)
6
pF
VIN = 0V
1. This parameter is characterized and is not 100% tested.
DC Characteristics
Table 3. DC Characteristics (1)
Symbol
Parameter
Max
Units
VCC
Supply Voltage
5.5
V
ICC
Supply Current VCC = 5.0V
READ at 100 kHz
0.4
1.0
mA
ICC
Supply Current VCC = 5.0V
WRITE at 100 kHz
2.0
3.0
mA
ISB1
Standby Current VCC = 2.7V
VIN = VCC or GND
1.6
4.0
µA
ISB2
Standby Current VCC = 5.0V
VIN = VCC or GND
8.0
18.0
µA
ILI
Input Leakage Current
VIN = VCC or GND
0.10
3.0
µA
ILO
Output Leakage Current
VOUT = VCC or GND
0.05
3.0
µA
−0.6
VCC x 0.3
V
VCC x 0.7
VCC + 0.5
V
0.4
V
VIL
Input Low Level
Test Condition
Typ
2.7
(2)
(2)
VIH
Input High Level
VOL
Output Low Level VCC = 3.0V
Notes:
Min
IOL = 2.1 mA
1. Applicable over recommended operating range from: TAC = 0°C to +70°C, VCC = +2.7V to +5.5V (unless otherwise noted)
2. VIL min and VIH max are reference only and are not tested.
AC Characteristics
Table 4. AC Characteristics(1)
Symbol
Parameter
fSCL
Clock Frequency, SCL
tLOW
Clock Pulse Width Low
tHIGH
Clock Pulse Width High
Min
Noise Suppression Time
tAA
Clock Low to Data Out Valid
tBUF
Time the bus must be free before a new transmission can start
400
kHz
µs
0.6
µs
0.1
(1)
Units
1.2
(2)
tI
Max
1.2
50
ns
0.9
µs
µs
3
1610B–SEEPR–04/04
Table 4. AC Characteristics(1) (Continued)
Symbol
Parameter
Min
tHD.STA
Start Hold Time
0.6
µs
tSU.STA
Start Setup Time
0.6
µs
tHD.DAT
Data In Hold Time
0
µs
tSU.DAT
Data In Setup Time
100
ns
tR
Inputs Rise Time(2)
(2)
Max
Units
0.3
µs
300
ns
tF
Inputs Fall Time
tSU.STO
Stop Setup Time
0.6
µs
tDH
Data Out Hold Time
50
ns
tWR
Write Cycle Time
Endurance
Note:
(1)
5
5.0V, 25°C, Byte Mode
1M
ms
Write Cycles
1. Applicable over recommended operating range from TA = 0°C to +70°C, VCC = +2.7V to +5.5V, CL = 1 TTL Gate and 100 pF
(unless otherwise noted)
2. This parameter is characterized and is not 100% tested.
Device Operation
CLOCK AND DATA TRANSITIONS: The SDA pin is normally pulled high with an external device. Data on the SDA pin may change only during SCL-low time periods (see
Figure 3 on page 5). Data changes during SCL-high periods will indicate a start or stop
condition as defined below.
START CONDITION: A high-to-low transition of SDA with SCL high is a start condition
that must precede any other command (see Figure 4 on page 6).
STOP CONDITION: A low-to-high transition of SDA with SCL high is a stop condition.
After a read sequence, the Stop command will place the EEPROM in a standby power
mode (see Figure 4 on page 6).
ACKNOWLEDGE: All addresses and data words are serially transmitted to and from the
EEPROM in 8-bit words. Each word requires the receiver to acknowledge that it has
received a valid command or data byte. During the transmission of commands from the
host to the EEPROM, the EEPROM will send a zero to the host to acknowledge that it
has received a valid command byte. This occurs on the ninth clock cycle of the command byte. During read operations, the host will send a zero to the EEPROM to
acknowledge that it has received a valid data byte and that it requests the next sequential data byte to be transmitted during the subsequent eight clock cycles. This occurs on
the ninth clock cycle of the data byte. If the host does not transmit this acknowledge bit,
the EEPROM will disable the read operation and return to standby mode.
STANDBY MODE: The AT24C01ASC/02SC/04SC/08SC/16SC feature a low-power
standby mode that is enabled upon power-up and after the receipt of the stop bit and the
completion of any internal operations.
MEMORY RESET: After an interruption in protocol, power loss, or system reset, any
two-wire part can be reset by following these steps:
1. Clock up to 9 cycles.
2. Look for SDA high in each cycle while SCL is high.
3. Create a start condition as SDA is high.
4
AT24C01ASC/02SC/04SC/08SC/16SC
1610B–SEEPR–04/04
AT24C01ASC/02SC/04SC/08SC/16SC
Timing Diagrams
Bus Timing
Figure 1. Bus Timing
Note:
Write Cycle Timing
SCL: Serial Clock, SDA: Serial Data I/O
Figure 2. Write Cycle Timing
tWR(1)
Notes:
Data Validity
1. The write cycle time tWR is the time from a valid stop condition of a write sequence to
the end of the internal clear/write cycle.
2. SCL: Serial Clock, SDA: Serial Data I/O
Figure 3. Data Validity
SDA
SCL
DATA STABLE
DATA STABLE
DATA
CHANGE
5
1610B–SEEPR–04/04
Start and Stop Definition
Figure 4. Start and Stop Definition
DA
CL
START
Output Acknowledge
STOP
Figure 5. Output Acknowledge
SCL
DATA IN
DATA OUT
START
6
ACKNOWLEDGE
AT24C01ASC/02SC/04SC/08SC/16SC
1610B–SEEPR–04/04
AT24C01ASC/02SC/04SC/08SC/16SC
Device Addressing
The 1K, 2K, 4K, 8K, and 16K EEPROM devices all require an 8-bit device address word
following a start condition to enable the chip for a read or write operation (see Figure 6
on page 7).
The device address word consists of a mandatory “1”, “0”, “1”, “0” sequence for the first
four most significant bits as shown. This is common to all the serial EEPROM devices.
The next three bits of the device address word are the most significant data word
address bits for the AT24C16SC (16K), which requires a total of 11 address bits. The
AT24C08SC (8K) requires only 10 total word address bits. The most significant two bits
are included in the device address word. The unused bit of the device address word
should be set to “0”. The AT24C04SC (4K) requires only nine total data word address
bits. The most significant bit is included in the device address word. The two unused bits
o f the devic e addr ess word s hould be s et to “0”. The AT24C 02SC (2K) and
AT24C01ASC (1K) do not require any address bits in the device address word. The
three unused bits of the device address word should be set to “0”.
The eighth bit of the device address is the read/write operation select bit. A read operation is initiated if this bit is high, and a write operation is initiated if this bit is low.
Upon a compare of the device address, the EEPROM will output a “0” (ACK). If a successful compare is not made, the chip will return to a standby state (NO ACK).
Figure 6. Device Address
1K/2K
1
0
1
0
0
0
MSD
Note:
0
R/W
LSB
4K
1
0
1
0
0
0
P0 R/W
8K
1
0
1
0
0
P1
P0 R/W
16K
1
0
1
0
P2
P1
P0 R/W
P0, P1, P2 = Data word address bits
7
1610B–SEEPR–04/04
Write Operations
BYTE WRITE: A write operation requires an 8-bit data word address following the
device address word and acknowledgment. Upon receipt of this address, the EEPROM
will again respond with a “0” (ACK) and then clock in the first 8-bit data word. Following
receipt of the 8-bit data word, the EEPROM will output a “0” (ACK) and the addressing
device, such as a microcontroller, must terminate the write sequence with a stop condition. At this time the EEPROM enters an internally-timed write cycle, t WR, to the
nonvolatile memory. All inputs are disabled during this write cycle and the EEPROM will
not respond until the write is complete (refer to Figure 7).
Figure 7. Byte Write
S
T
A
R
T
W
R
I
T
E
WORD ADDRESS
S
T
O
P
DATA
*
L
S
B
PAGE WRITE: The 1K/2K EEPROM is capable of an 8-byte page write, and the 4K, 8K,
and 16K devices are capable of 16-byte page writes.
A page write is initiated the same as a byte write, but the microcontroller does not send
a stop condition after the first data word is clocked in. Instead, after the EEPROM
acknowledges receipt of the first data word, the microcontroller can transmit up to 7
(1K/2K) or 15 (4K, 8K, 16K) more data words. The EEPROM will respond with a “0”
(ACK) after each data word received. The microcontroller must terminate the page write
sequence with a stop condition (refer to Figure 8).
Figure 8. Page Write
(n)
Note:
DATA (n)
DATA (n + 1)
DATA (n + x)
* = DON’T CARE bit for 1K
The data word address lower three (1K/2K) or four (4K, 8K, 16K) bits are internally
incremented following the receipt of each data word. The higher data word address bits
are not incremented, retaining the memory page row location. When the word address,
internally generated, reaches the page boundary, the following byte is placed at the
beginning of the same page. If more than eight (1K/2K) or 16 (4K, 8K, 16K) data words
are transmitted to the EEPROM, the data word address will “roll over” and previous data
will be overwritten.
ACKNOWLEGE POLLING: Once the internally timed write cycle has started and the
EEPROM inputs are disabled, acknowledge polling can be initiated. This involves sending a start condition followed by the device address word. The read/write bit is
representative of the operation desired. Only if the internal write cycle has completed
8
AT24C01ASC/02SC/04SC/08SC/16SC
1610B–SEEPR–04/04
AT24C01ASC/02SC/04SC/08SC/16SC
will the EEPROM respond with a “0” (ACK), allowing the read or write sequence to
continue.
Read Operations
Read operations are initiated the same way as write operations, with the exception that
the read/write select bit in the device address word is set to “1”. There are three read
operations: current address read, random address read, and sequential read.
CURRENT ADDRESS READ: The internal data word address counter maintains the
last address accessed during the last read or write operation, incremented by one. This
address stays valid between operations as long as the chip power is maintained. The
address “rollover” during read is from the last byte of the last memory page to the first
byte of the first page. The address “rollover” during write is from the last byte of the current page to the first byte of the same page.
Once the device address with the read/write select bit set to “1” is clocked in and
acknowledged by the EEPROM, the current address data word is serially clocked out.
The microcontroller does not respond with an input “0” but does generate a following
stop condition (refer to Figure 9)
Figure 9. Current Address Read.
S
T
A
R
T
DEVICE
ADDRESS
R
E
A
D
SDA LINE
L R A
S / C
B W K
M
S
B
DATA
N
O
A
C
K
RANDOM READ: A random read requires a “dummy” byte write sequence to load in the
data word address. Once the device address word and data word address are clocked
in and acknowledged by the EEPROM, the microcontroller must generate another start
condition. The microcontroller now initiates a current address read by sending a device
address with the read/write select bit high. The EEPROM acknowledges the device
address and serially clocks out the data word. The microcontroller does not respond
with a “0” (NO ACK) but does generate a following stop condition (refer to Figure 10).
Figure 10. Random Read
WORD
ADDRESS n
L A
S C
B K
Note:
M
S
B
L
S
B
* = DON’T CARE bit for 1K)
9
1610B–SEEPR–04/04
SEQUENTIAL READ: Sequential reads are initiated by either a current address read or
a random address read. After the microcontroller receives a data word, it responds with
an acknowledge. As long as the EEPROM receives an acknowledge, it will continue to
increment the data word address and serially clock out sequential data words. When the
memory address limit is reached, the data word address will “rollover” and the sequential read will continue. The sequential read operation is terminated when the
microcontroller does not respond with a “0” (NO ACK) but does generate a following
stop condition (refer to Figure 11).
Figure 11. Sequential Read
10
AT24C01ASC/02SC/04SC/08SC/16SC
1610B–SEEPR–04/04
AT24C01ASC/02SC/04SC/08SC/16SC
AT24C01ASC Ordering Information
Ordering Code
Package
Voltage Range
Operation Range
AT24C01ASC-09ET
M2 – E Module
2.7V–5.5V
Commercial (0°C–70°C)
AT24C01ASC-09GT
M3 – G Module
2.7V–5.5V
Commercial (0°C–70°C)
AT24C01ASC-09HT
M3 – H Module
2.7V–5.5V
Commercial (0°C–70°C)
AT24C01ASC-09PT
M2 – P Module
2.7V–5.5V
Commercial (0°C–70°C)
AT24C01ASC-10WI
7 mil Wafer
2.7V–5.5V
Industrial (−40°C–85°C)
Package
Voltage Range
Operation Range
AT24C02SC-09ET
M2 – E Module
2.7V–5.5V
Commercial (0°C–70°C)
AT24C02SC-09PT
M2 – PModule
2.7V–5.5V
Commercial (0°C–70°C)
AT24C02SC-10WI
7 mil Wafer
2.7V–5.5V
Industrial (−40°C–85°C)
Package
Voltage Range
Operation Range
AT24C04SC-09ET
M2 – E Module
2.7V–5.5V
Commercial (0°C–70°C)
AT24C04SC-09PT
M2 – PModule
2.7V–5.5V
Commercial (0°C–70°C)
AT24C04SC-10WI
7 mil Wafer
2.7V–5.5V
Industrial (−40°C–85°C)
Package
Voltage Range
Operation Range
AT24C08SC-09ET
M2 – E Module
2.7V–5.5V
Commercial (0°C–70°C)
AT24C08SC-09PT
M2 – PModule
2.7V–5.5V
Commercial (0°C–70°C)
AT24C08SC-10WI
7 mil Wafer
2.7V–5.5V
Industrial (−40°C–85°C)
Package
Voltage Range
Operation Range
AT24C16SC-09ET
M2 – E Module
2.7V–5.5V
Commercial (0°C–70°C)
AT24C16SC-09PT
M2 – PModule
2.7V–5.5V
Commercial (0°C–70°C)
AT24C16SC-10WI
7 mil Wafer
2.7V–5.5V
Industrial (−40°C–85°C)
AT24C02SC Ordering Information
Ordering Code
AT24C04SC Ordering Information
Ordering Code
AT24C08SC Ordering Information
Ordering Code
AT24C16SC Ordering Information
Ordering Code
11
1610B–SEEPR–04/04
Package Type(1)
Description
M2 – P Module
M2 ISO 7816 Smart Card Module with Atmel Logo
M2 – E Module
M2 ISO 7816 Smart Card Module
M3 – G Module
M3 ISO 7816 Smart Card Module
M3 – H Module
M3 ISO 7816 Smart Card Module with Atmel Logo
Note:
12
1. Formal drawings may be obtained from an Atmel sales office.
AT24C01ASC/02SC/04SC/08SC/16SC
1610B–SEEPR–04/04
AT24C01ASC/02SC/04SC/08SC/16SC
Smart Card Modules
Ordering Code: 09GT-00
Ordering Code: 09ET-00
Module Size: M2-00
Dimension*: 12.6 x 11.4 [mm]
Glob Top: Clear, Round: 8.0 [mm] max
Thickness: 0.58 [mm] max
Pitch: 14.25 [mm]
Æ
Ordering Code: 09PT-00
Module Size: M2
Dimension*: 12.6 x 11.4 [mm]
Glob Top: Square: 8.8 x 8.8 [mm]
Thickness: 0.58 [mm]
Pitch: 14.25 [mm]
Module Size: M3
Dimension*: 10.6 x 8.0 [mm]
Glob Top: Clear, Round: 6.9 [mm] max
Thickness: 0.58 [mm] max
Pitch: 9.5 [mm]
Æ
Ordering Code: 09HT-00
Module Size: M3
Dimension*: 10.6 x 8.0 [mm]
Glob Top: Clear, Round: 6.9 [mm]
Thickness: 0.58 [mm] max
Pitch: 9.5 [mm]
Æ
*Note: The module dimensions listed refer to the dimensions of the exposed metal contact area. The actual dimensions
of the module after excise or punching from the carrier tape are generally 0.4 mm greater in both directions
(i.e., a punched M2 module will yield 13.0 x 11.8 mm).
13
1610B–SEEPR–04/04
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1610B–SEEPR–04/04
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