25AA256/25LC256
256K SPI Bus Serial EEPROM
Device Selection Table
Part Number
25LC256
25AA256
V
CC
Range
2.5V-5.5V
1.8V-5.5V
Page Size
64 Bytes
64 Bytes
Temp. Ranges
I, E
I, E
Packages
MF, P, SN, SM, ST
MF, P, SN, SM, ST
Features
• Maximum Clock 10 MHz
• Low-Power CMOS Technology:
- Maximum Write current: 5 mA at 5.5V,
10 MHz
- Read current: 6 mA at 5.5V, 10 MHz
- Standby current: 1 µA at 5.5V
• 32,768 x 8-Bit Organization
• 64-Byte Page
• Self-Timed Erase and Write Cycles (5 ms
maximum)
• Block Write Protection:
- Protect none, 1/4, 1/2 or all of array
• Built-In Write Protection:
- Power-on/off data protection circuitry
- Write enable latch
- Write-protect pin
• Sequential Read
• High Reliability:
- Endurance: 1,000,000 erase/write cycles
- Data retention: > 200 years
- ESD protection: > 4000V
• Temperature Ranges Supported:
- Industrial (I):
-40C to +85C
- Extended (E):
-40°C to +125°C
• RoHS Compliant
• Automotive AEC-Q100 Qualified
Pin Function Table
Name
CS
SO
WP
V
SS
SI
SCK
HOLD
V
CC
Function
Chip Select Input
Serial Data Output
Write-Protect
Ground
Serial Data Input
Serial Clock Input
Hold Input
Supply Voltage
Description
The Microchip Technology Inc. 25AA256/25LC256
(25XX256
(1)
) are 256-Kbit Serial Electrically Erasable
PROMs. The memory is accessed via a simple Serial
Peripheral Interface (SPI) compatible serial bus. The
bus signals required are a clock input (SCK) plus
separate data in (SI) and data out (SO) lines. Access to
the device is controlled through a Chip Select (CS)
input.
Communication to the device can be paused via the
hold pin (HOLD). While the device is paused,
transitions on its inputs will be ignored, with the
exception of Chip Select, allowing the host to service
higher priority interrupts.
Note 1:
25XX256 is used in this document as a
generic
part
number
for
the
25AA256/25LC256 devices.
Packages
• 8-Lead DFN-S, 8-Lead PDIP, 8-Lead SOIC,
8-Lead SOIJ and 8-Lead TSSOP
Package Types (not to scale)
DFN-S
CS
SO
WP
V
SS
1
2
3
4
8
7
6
5
PDIP/SOIC
V
CC
HOLD
SCK
SI
CS
SO
WP
Vss
1
2
3
4
Rotated TSSOP
1
2
3
4
8
7
6
5
TSSOP
SCK CS
SI SO
V
SS
WP
WP V
SS
1
2
3
4
8
7
6
5
Vcc HOLD
HOLD V
CC
6
SCK
CS
SO
5
SI
8
7
V
CC
HOLD
SCK
SI
2003-2021 Microchip Technology Inc.
DS20001822J-page 1
25AA256/25LC256
1.0
ELECTRICAL CHARACTERISTICS
Absolute Maximum Ratings
(†)
V
CC
.............................................................................................................................................................................6.5V
All inputs and outputs w.r.t. V
SS
......................................................................................................... -0.6V to V
CC
+1.0V
Storage temperature ...............................................................................................................................-65°C to +150°C
Ambient temperature under bias .............................................................................................................-40°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 an
extended period of time 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
Extended (E): T
A
= -40°C to +125°C V
CC
= 1.8V to 5.5V
Minimum Maximum Units
0.7 V
CC
-0.3
-0.3
—
—
V
CC
-0.5
—
—
—
—
V
CC
+1
0.3 V
CC
0.2 V
CC
0.4
0.2
—
±1
±1
7
6
2.5
5
3
5
1
V
V
V
V
V
V
µA
µA
pF
mA
mA
mA
mA
µA
µA
V
CC
2.5V
V
CC
< 2.5V
I
OL
= 2.1 mA, V
CC
= 4.5V
I
OL
= 1.0 mA, V
CC
= 2.5V
I
OH
= -400 µA
CS = V
CC
, V
IN
= V
SS
or V
CC
CS = V
CC
, V
OUT
= V
SS
or V
CC
T
A
= 25°C, F
CLK
= 1.0 MHz,
V
CC
= 5.0V
(Note
2)
V
CC
= 5.5V; F
CLK
= 10.0 MHz;
SO = Open
V
CC
= 2.5V; F
CLK
= 5.0 MHz;
SO = Open
V
CC
= 5.5V
V
CC
= 2.5V
CS = V
CC
= 5.5V, Inputs tied to
V
CC
or V
SS
, +125°C
CS = V
CC
= 5.5V, Inputs tied to
V
CC
or V
SS
, +85°C
Test Conditions
DC CHARACTERISTICS
Param.
Symbol
No.
D001
D002
D003
D004
D005
D006
D007
D008
D009
V
IH
V
IL
V
IL
V
OL
V
OL
V
OH
I
LI
I
LO
C
INT
I
CC
Read
I
CC
Write
Characteristic
High-Level Input Voltage
Low-Level Input Voltage
Low-Level Output
Voltage
High-Level Output
Voltage
Input Leakage Current
Output Leakage Current
Internal Capacitance
(All Inputs and Outputs)
D010
Operating Current
—
—
—
—
D011
D012
Note 1:
2:
I
CCS
Standby Current
—
Typical measurements taken at room temperature (+25°C).
This parameter is periodically sampled and not 100% tested.
DS20001822J-page 2
2003-2021 Microchip Technology Inc.
25AA256/25LC256
TABLE 1-2:
AC CHARACTERISTICS (CONTINUED)
Industrial (I): T
A
= -40°C to +85°C V
CC
= 1.8V to 5.5V
Extended (E): T
A
= -40°C to +125°C V
CC
= 1.8V to 5.5V
Characteristic
Minimum Maximum
20
17
T
HH
HOLD Hold Time
40
80
—
18
T
HZ
HOLD Low to Output High-Z
—
—
—
19
20
21
T
HV
T
WC
HOLD High to Output Valid
Internal Write Cycle Time
Endurance
—
—
—
1M
—
—
—
30
60
160
30
60
160
5
—
Units
ns
ns
ns
ns
ns
ns
ns
ns
ns
ms
Test Conditions
4.5V
Vcc
5.5V
2.5V
Vcc
4.5V
1.8V
Vcc
2.5V
4.5V
Vcc
5.5V
(Note
1)
2.5V
Vcc
4.5V
(Note
1)
1.8V
Vcc
2.5V
(Note
1)
4.5V
Vcc
5.5V
2.5V
Vcc
4.5V
1.8V
Vcc
2.5V
Note 2
AC CHARACTERISTICS
Param.
Symbol
No.
E/W Cycles +25°C, V
CC
= 5.5V
(Note
3)
Note 1:
This parameter is periodically sampled and not 100% tested.
2:
T
WC
begins on the rising edge of CS after a valid write sequence and ends when the internal write cycle
is complete.
3:
This parameter is not tested but ensured by characterization.
TABLE 1-3:
AC Waveform
V
LO
= 0.2V
AC TEST CONDITIONS
—
Note 1
Note 2
—
0.5 V
CC
0.5 V
CC
V
H I
= V
CC
– 0.2V
V
H I
= 4.0V
C
L
= 50 pF
Timing Measurement Reference Level
Input
Output
Note 1:
2:
For V
CC
4.0V
For V
CC
> 4.0V
DS20001822J-page 4
2003-2021 Microchip Technology Inc.
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