..........................................................................................................-0.6V to V
CC
+1.0V
Storage temperature ...............................................................................................................................-65°C to +150°C
Ambient temperature with power applied..................................................................................................-40°C to +85°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 these or any other conditions above those
indicated in the operational listings of this specification is not implied. Exposure to Absolute Maximum Rating
conditions for extended periods may affect device reliability.
TABLE 1-1:
DC CHARACTERISTICS
Electrical Characteristics:
Industrial (I):
V
CC
= +1.7V to 5.5V
Characteristic
High-Level Input Voltage
Low-Level Input Voltage
Hysteresis of Schmitt
Trigger Inputs
(SDA, SCL pins)
Low-Level Output Voltage
Input Leakage Current
Output Leakage Current
Pin Capacitance
(all inputs/outputs)
Min.
0.7 V
CC
—
—
0.05 V
CC
Max.
—
0.3 V
CC
0.2 V
CC
—
Units
V
V
V
V
V
CC
≥
2.5V
V
CC
< 2.5V
V
CC
≥
2.5V
(Note)
T
A
= -40°C to +85°C
Conditions
DC CHARACTERISTICS
Param.
Symbol
No.
D1
D2
D3
V
IH
V
IL
V
HYS
D4
D5
D6
D7
D8
D9
V
OL
I
LI
I
LO
C
IN
,
C
OUT
I
CCWRITE
I
CCS
—
—
—
—
—
—
—
—
0.40
0.40
±1
±1
10
400
3
1
V
V
µA
µA
pF
µA
mA
µA
I
OL
= 3.0 mA; V
CC
= 4.5V
I
OL
= 2.1 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
V
CC
= 5.5V
T
A
= -40°C to +85°C
SCL = SDA = V
CC
= 5.5V
A0, A1, A2 = V
SS
I
CCREAD
Operating Current
Standby Current
Note:
This parameter is periodically sampled and not 100% tested.
2013-2018 Microchip Technology Inc.
DS20005215D-page 2
24AA256UID
TABLE 1-2:
AC CHARACTERISTICS
Electrical Characteristics:
Industrial (I):
V
CC
= +1.7V to 5.5V
Characteristic
Clock Frequency
Clock High Time
Clock Low Time
SDA and SCL Rise Time
(Note
1)
SDA and SCL Fall Time
(Note
1)
Min.
—
—
2
3
4
5
6
7
8
9
10
11
12
T
HIGH
T
LOW
T
R
T
F
4000
600
4700
1300
—
—
—
4000
600
T
SU
:
STA
Start Condition Setup Time
T
HD
:
DAT
Data Input Hold Time
T
SU
:
DAT
Data Input Setup Time
T
SU
:
STO
Stop Condition Setup Time
T
AA
T
BUF
Output Valid from Clock
(Note
2)
Bus Free Time: Bus time
must be free before a new
transmission can start
Output Fall Time from V
IH
minimum to V
IL
maximum
C
B
≤
100 pF
Input Filter Spike
Suppression (SDA and SCL
pins)
Write Cycle Time (byte or
page)
Endurance
4700
600
0
250
100
4000
600
—
—
4700
1300
10 + 0.1C
B
Max.
100
400
—
—
—
—
1000
300
300
—
—
—
—
—
—
—
—
—
3500
900
—
—
250
Units
kHz
kHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
1.7V
≤
V
CC
< 2.5V
2.5V
≤
V
CC
≤
5.5V
1.7V
≤
V
CC
< 2.5V
2.5V
≤
V
CC
≤
5.5V
Note 2
1.7V
≤
V
CC
< 2.5V
2.5V
≤
V
CC
≤
5.5V
1.7V
≤
V
CC
< 2.5V
2.5V
≤
V
CC
≤
5.5V
1.7 V
≤
V
CC
< 2.5V
2.5 V
≤
V
CC
≤
5.5V
1.7V
≤
V
CC
< 2.5V
2.5V
≤
V
CC
≤
5.5V
Note 1
T
A
= -40°C to +85°C
Conditions
1.7V
≤
V
CC
< 2.5V
2.5V
≤
V
CC
≤
5.5V
1.7V
≤
V
CC
< 2.5V
2.5V
≤
V
CC
≤
5.5V
1.7V
≤
V
CC
< 2.5V
2.5V
≤
V
CC
≤
5.5V
1.7V
≤
V
CC
< 2.5V
2.5V
≤
V
CC
≤
5.5V
AC CHARACTERISTICS
Param.
Symbol
No.
1
F
CLK
T
HD
:
STA
Start Condition Hold Time
13
T
OF
14
T
SP
—
50
ns
Notes 1
and
3
15
16
Note 1:
2:
3:
4:
T
WC
—
1,000,000
5
—
ms
cycles Page mode, 25°C, 5.5V
(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 website
at www.microchip.com.
2013-2018 Microchip Technology Inc.
DS20005215D-page 3
24AA256UID
FIGURE 1-1:
BUS TIMING DATA
5
2
D3
4
SCL
SDA
IN
7
6
14
3
8
9
10
11
SDA
OUT
12
2013-2018 Microchip Technology Inc.
DS20005215D-page 4
24AA256UID
2.0
PIN DESCRIPTIONS
The descriptions of the pins are listed in
Table 2-1.
TABLE 2-1:
Name
A0
A1
A2
V
SS
SDA
SCL
NC
V
CC
PIN FUNCTION TABLE
8-pin
PDIP
1
2
3
4
5
6
7
8
8-pin
SOIC
1
2
3
4
5
6
7
8
8-pin
TSSOP
1
2
3
4
5
6
7
8
Function
User Configurable Chip Select
User Configurable Chip Select
User Configurable Chip Select
Ground
Serial Data
Serial Clock
Not Connected
+1.7V to 5.5V
2.1
A0, A1, A2 Chip Address Inputs
2.2
Serial Data (SDA)
The A0, A1 and A2 inputs are used by the 24AA256UID
for multiple device operations. The levels on these
inputs are compared with the corresponding bits in the
slave address. The chip is selected if the compare is
true.
Up to eight devices may be connected to the same bus
by using different Chip Select bit combinations. These
inputs must be connected to either V
CC
or V
SS
.
In most applications, the chip address inputs A0, A1
and A2 are hard-wired to logic ‘0’ or logic ‘1’. For
applications in which these pins are controlled by a
microcontroller or other programmable device, the chip
address pins must be driven to logic ‘0’ or logic ‘1’
before normal device operation can proceed.
This is a bidirectional pin used to transfer addresses
and data into and out of the device. It is an open-drain
terminal. Therefore, the SDA bus requires a pull-up
resistor to V
CC
(typical 10 kΩ for 100 kHz, 2 kΩ for
400 kHz).
For normal data transfer, SDA is allowed to change
only during SCL low. Changes during SCL high are
reserved for indicating the Start and Stop conditions.
2.3
Serial Clock (SCL)
This input is used to synchronize the data transfer to
FPGA/CPLD
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