24AA01/24LC01B
1K I
2
C
™
Serial EEPROM
Device Selection Table
Part
Number
24AA01
24LC01B
Note 1:
V
CC
Range
1.8-5.5
2.5-5.5
Max. Clock
Frequency
400 kHz
(1)
400 kHz
Temp.
Ranges
I
I, E
Description:
The Microchip Technology Inc. 24AA01/24LC01B
(24XX01*) is a 1 Kbit Electrically Erasable PROM. The
device is organized as one block of 128 x 8-bit memory
with a 2-wire serial interface. Low-voltage design
permits operation down to 1.8V with standby and active
currents of only 1
μA
and 1 mA, respectively. The
24XX01 also has a page write capability for up to 8
bytes of data. The 24XX01 is available in the standard
8-pin PDIP, surface mount SOIC, TSSOP, 2x3 DFN and
MSOP packages, and is also available in the 5-lead
SOT-23 package.
100 kHz for V
CC
<2.5V
Features:
• Single supply with operation down to 1.8V
• Low-power CMOS technology:
- 1 mA active current typical
- 1
μA
standby current typical (I-temp)
• Organized as 1 block of 128 bytes (1 x 128 x 8)
• 2-wire serial interface bus, I
2
C™ compatible
• Schmitt Trigger inputs for noise suppression
• Output slope control to eliminate ground bounce
• 100 kHz (24AA01) and 400 kHz (24LC01B)
compatibility
• Self-timed write cycle (including auto-erase)
• Page write buffer for up to 8 bytes
• Hardware write-protect for entire memory
• Can be operated as a serial ROM
• Factory programming (QTP) available
• ESD protection > 4,000V
• 1,000,000 erase/write cycles
• Data retention > 200 years
• 8-lead PDIP, SOIC, TSSOP, DFN and MSOP
packages
• 5-lead SOT-23 package
• Pb-free finish available
• Available for extended temperature ranges:
- Industrial (I): -40°C to +85°C
- Automotive (E): -40°C to +125°C
Package Types
PDIP, MSOP
A0
A1
A2
V
SS
1
2
3
4
SOT-23-5
SCL
Vss
SDA
Note:
1
2
3
4
Vcc
5
WP
A0 1
A1 2
A2 3
V
SS
4
8
7
6
5
V
CC
WP
SCL
A0
A1
A2
SOIC, TSSOP
1
2
3
4
DFN
8 V
CC
7 WP
6 SCL
5 SDA
8
7
6
5
V
CC
WP
SCL
SDA
SDA V
SS
Pins A0, A1 and A2 are not used by the 24XX01 (no
internal connections).
Block Diagram
WP
HV Generator
I/O
Control
Logic
Memory
Control
Logic
XDEC
EEPROM
Array
Page Latches
I/O
SCL
YDEC
SDA
V
CC
V
SS
Sense Amp.
R/W Control
©
2005 Microchip Technology Inc.
DS21711E-page 1
24AA01/24LC01B
1.0
ELECTRICAL CHARACTERISTICS
Absolute Maximum Ratings
(†)
V
CC
.............................................................................................................................................................................6.5V
All inputs and outputs w.r.t. V
SS
......................................................................................................... -0.3V to V
CC
+1.0V
Storage temperature ...............................................................................................................................-65°C to +150°C
Ambient temperature with power applied ................................................................................................-65°C to +125°C
ESD protection on all pins
......................................................................................................................................................≥
4 kV
† NOTICE: Stresses above 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 those or any other conditions
above those indicated in the operational listings of this specification is not implied. Exposure to maximum rating
conditions for extended periods may affect device reliability.
TABLE 1-1:
DC CHARACTERISTICS
Industrial (I):
T
A
= -40°C to +85°C, V
CC
= +1.8V to +5.5V
Automotive (E): T
A
= -40°C to +125°C, V
CC
= +2.5V to +5.5V
Min.
—
DC CHARACTERISTICS
Param.
No.
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
Sym.
V
IH
—
V
IL
V
HYS
V
OL
I
LI
I
LO
C
IN
,
C
OUT
I
CC
read
I
CCS
Standby current
Characteristic
WP, SCL and SDA pins
High-level input voltage
Low-level input voltage
Hysteresis of Schmitt
Trigger inputs
Low-level output voltage
Input leakage current
Output leakage current
Pin capacitance
(all inputs/outputs)
Typ.
—
—
—
—
—
—
—
—
0.1
0.05
0.01
—
Max.
—
—
0.3 V
CC
—
0.40
±1
±1
10
3
1
1
5
Units
—
V
V
V
V
μA
μA
pF
mA
mA
μΑ
μΑ
—
—
—
(Note)
Conditions
0.7 V
CC
—
0.05 V
CC
—
—
—
—
—
—
—
—
I
OL
= 3.0 mA, V
CC
= 2.5V
V
IN
= V
SS
or V
CC
V
OUT
= V
SS
or V
CC
V
CC
= 5.0V
(Note)
T
A
= 25°C, F
CLK
= 1 MHz
V
CC
= 5.5V, SCL = 400 kHz
—
Industrial
Automotive
SDA = SCL = V
CC
WP = V
SS
I
CC
write
Operating current
Note:
This parameter is periodically sampled and not 100% tested.
DS21711E-page 2
©
2005 Microchip Technology Inc.
24AA01/24LC01B
TABLE 1-2:
AC CHARACTERISTICS
Industrial (I):
T
A
= -40°C to +85°C, V
CC
= +1.8V to +5.5V
Automotive (E): T
A
= -40°C to +125°C, V
CC
= +2.5V to +5.5V
Min.
—
—
600
4000
1300
4700
—
—
—
600
4000
600
4700
0
100
250
600
4000
—
—
1300
4700
Typ.
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
Max.
400
100
—
—
—
—
300
1000
300
—
—
—
—
—
—
—
—
—
900
3500
—
—
Units
kHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Conditions
2.5V
≤
V
CC
≤
5.5V
1.8V
≤
V
CC
<
2.5V
(24AA01)
2.5V
≤
V
CC
≤
5.5V
1.8V
≤
V
CC
<2.5V
(24AA01)
2.5V
≤
V
CC
≤
5.5V
1.8V
≤
V
CC
<
2.5V
(24AA01)
2.5V
≤
V
CC
≤
5.5V
1.8V
≤
V
CC
<
2.5V
(24AA01)
(Note 1)
2.5V
≤
V
CC
≤
5.5V
1.8V
≤
V
CC
<
2.5V
(24AA01)
2.5V
≤
V
CC
≤
5.5V
1.8V
≤
V
CC
<
2.5V
(24AA01)
(Note 2)
2.5V
≤
V
CC
≤
5.5V
1.8V
≤
V
CC
<
2.5V
(24AA01)
2.5V
≤
V
CC
≤
5.5V
1.8V
≤
V
CC
<
2.5V
(24AA01)
2.5V
≤
V
CC
≤
5.5V
1.8V
≤
V
CC
<
2.5V
(24AA01)
2.5V
≤
V
CC
≤
5.5V
1.8V
≤
V
CC
<
2.5V
(24AA01)
AC CHARACTERISTICS
Param.
No.
1
2
3
4
5
6
7
8
9
10
11
12
Sym.
F
CLK
T
HIGH
T
LOW
T
R
T
F
T
HD
:
STA
T
SU
:
STA
T
HD
:
DAT
T
SU
:
DAT
T
SU
:
STO
T
AA
T
BUF
Characteristic
Clock frequency
Clock high time
Clock low time
SDA and SCL rise time
(Note 1)
SDA and SCL fall time
Start condition hold time
Start condition setup
time
Data input hold time
Data input setup time
Stop condition setup
time
Output valid from clock
(Note 2)
Bus free-time: Time the
bus must be free before
a new transmission can
start
Output fall time from V
IH
minimum to V
IL
maximum
Input filter spike
suppression
(SDA and SCL pins)
Write cycle time
(byte or page)
Endurance
13
T
OF
20+0.1C
B
—
—
—
—
—
250
250
50
ns
2.5V
≤
V
CC
≤
5.5V
1.8V
≤
V
CC
<
2.5V
(24AA01)
(Notes 1 and 3)
14
T
SP
ns
15
16
Note 1:
2:
3:
4:
T
WC
—
—
1M
—
—
5
—
ms
—
cycles 25°C,
(Note 4)
Not 100% tested. C
B
= total capacitance of one bus line in pF.
As a transmitter, the device must provide an internal minimum delay time to bridge the undefined region
(minimum 300 ns) of the falling edge of SCL to avoid unintended generation of Start or Stop conditions.
The combined T
SP
and V
HYS
specifications are due to new Schmitt Trigger inputs which provide improved
noise spike suppression. This eliminates the need for a
T
I
specification for standard operation.
This parameter is not tested but ensured by characterization. For endurance estimates in a specific
application, please consult the Total Endurance™ Model which can be obtained from Microchip’s web site
at www.microchip.com.
©
2005 Microchip Technology Inc.
DS21711E-page 3
24AA01/24LC01B
FIGURE 1-1:
BUS TIMING DATA
5
3
SCL
7
SDA
IN
6
14
2
4
8
9
10
11
SDA
OUT
12
FIGURE 1-2:
BUS TIMING START/STOP
D4
SCL
7
SDA
6
10
Start
Stop
DS21711E-page 4
©
2005 Microchip Technology Inc.
24AA01/24LC01B
2.0
FUNCTIONAL DESCRIPTION
3.4
Data Valid (D)
The 24XX01 supports a bidirectional, 2-wire bus and
data transmission protocol. A device that sends data
onto the bus is defined as transmitter, while defining a
device receiving data as a receiver. The bus has to be
controlled by a master device which generates the
Serial Clock (SCL), controls the bus access and
generates the Start and Stop conditions, while the
24XX01 works as slave. Both master and slave can
operate as transmitter or receiver, but the master
device determines which mode is activated.
The state of the data line represents valid data when,
after a Start condition, the data line is stable for the
duration of the high period of the clock signal.
The data on the line must be changed during the low
period of the clock signal. There is one clock pulse per
bit of data.
Each data transfer is initiated with a Start condition and
terminated with a Stop condition. The number of data
bytes transferred between the Start and Stop
conditions is determined by the master device and is,
theoretically, unlimited (although only the last sixteen
will be stored when doing a write operation). When an
overwrite does occur, it will replace data in a first-in
first-out (FIFO) fashion.
3.0
BUS CHARACTERISTICS
The following
bus protocol
has been defined:
• Data transfer may be initiated only when the bus
is not busy.
• During data transfer, the data line must remain
stable whenever the clock line is high. Changes in
the data line while the clock line is high will be
interpreted as a Start or Stop condition.
Accordingly, the following bus conditions have been
defined (Figure 3-1).
3.5
Acknowledge
Each receiving device, when addressed, is obliged to
generate an acknowledge after the reception of each
byte. The master device must generate an extra clock
pulse which is associated with this Acknowledge bit.
Note:
The 24XX01 does not generate any
Acknowledge
bits
if
an
internal
programming cycle is in progress.
3.1
Bus Not Busy (A)
Both data and clock lines remain high.
3.2
Start Data Transfer (B)
A high-to-low transition of the SDA line while the clock
(SCL) is high determines a Start condition. All
commands must be preceded by a Start condition.
3.3
Stop Data Transfer (C)
A low-to-high transition of the SDA line while the clock
(SCL) is high determines a Stop condition. All
operations must be ended with a Stop condition.
The device that acknowledges has to pull down the
SDA line during the acknowledge clock pulse in such a
way that the SDA line is stable low during the high
period of the acknowledge-related clock pulse. Of
course, setup and hold times must be taken into
account. During reads, a master must signal an end of
data to the slave by not generating an Acknowledge bit
on the last byte that has been clocked out of the slave.
In this case, the slave (24XX01) will leave the data line
high to enable the master to generate the Stop
condition.
FIGURE 3-1:
(A)
SCL
(B)
DATA TRANSFER SEQUENCE ON THE SERIAL BUS
(D)
(D)
(C)
(A)
SDA
Start
Condition
Address or
Acknowledge
Valid
Data
Allowed
to Change
Stop
Condition
©
2005 Microchip Technology Inc.
DS21711E-page 5
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