Not recommended for new designs –
Please use 25AA040A or 25LC040A.
25AA040/25LC040/25C040
4K SPI Bus Serial EEPROM
Device Selection Table
Part
Number
25AA040
25LC040
25C040
V
CC
Range
1.8-5.5V
2.5-5.5V
4.5-5.5V
Max. Clock
Frequency
1 MHz
2 MHz
3 MHz
Temp.
Ranges
I
I
I,E
Communication to the device can be paused via the
hold pin (HOLD). While the device is paused, transi-
tions on its inputs will be ignored, with the exception of
Chip Select, allowing the host to service higher priority
interrupts. Also, write operations to the device can be
disabled via the write-protect pin (WP).
Package Types
PDIP
CS
SO
1
8
V
CC
HOLD
SCK
SI
2
3
4
25XX040
Features:
• Low-power CMOS technology:
- Write current: 3 mA, typical
- Read current: 500
μA,
typical
- Standby current: 500 nA, typical
• 512 x 8-bit organization
• 16 byte page
• Write cycle time: 5 ms max.
• Self-timed Erase and Write cycles
• 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: 1M cycles
- Data retention: > 200 years
- ESD protection: > 4000V
• 8-pin PDIP, SOIC and TSSOP packages
• Temperature ranges supported:
- Industrial (I):
-40°C to +85°C
- Automotive (E) (25C040):
-40°C to +125°C
7
6
5
WP
V
SS
SOIC
CS
SO
WP
V
SS
1
8
V
CC
HOLD
SCK
SI
2
3
4
25XX040
1
2
3
4
7
6
5
TSSOP
25XX040
HOLD
V
CC
CS
SO
8
7
6
5
SCK
SI
V
SS
WP
Block Diagram
STATUS
Register
HV Generator
I/O Control
Logic
Description:
The Microchip Technology Inc. 25AA040/25LC040/
25C040 (25XX040
*
) is a 4 Kbit serial Electrically
Erasable PROM. 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.
*25XX040 is used in this document as a generic part number
for the 25AA040/25LC040/25C040 devices.
Memory
Control
Logic
EEPROM
Array
XDEC
Page
Latches
SI
SO
CS
SCK
HOLD
WP
V
CC
V
SS
Y Decoder
Sense Amp.
R/W Control
©
2006 Microchip Technology Inc.
DS21204E-page 1
25AA040/25LC040/25C040
1.0
ELECTRICAL CHARACTERISTICS
Absolute Maximum Ratings
(†)
V
CC
.............................................................................................................................................................................7.0V
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 ...............................................................................................................-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 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
Automotive (E): T
A
= -40°C to +125°C V
CC
= 4.5V to 5.5V (25C040 only)
Min.
2.0
0.7 V
CC
-0.3
-0.3
—
—
V
CC
-0.5
—
—
—
Max.
V
CC
+1
V
CC
+1
0.8
0.3 V
CC
0.4
0.2
—
±1
±1
7
Units
V
V
V
V
V
V
V
μA
μA
pF
Test Conditions
V
CC
≥
2.7V
(Note)
V
CC
< 2.7V
(Note)
V
CC
≥
2.7V
(Note)
V
CC
< 2.7V
(Note)
I
OL
= 2.1 mA
I
OL
= 1.0 mA, V
CC
< 2.5V
I
OH
=-400
μA
CS = V
CC
, V
IN
= V
SS TO
V
CC
CS = V
CC
, V
OUT
= V
SS TO
V
CC
T
A
= 25°C, CLK = 1.0 MHz,
V
CC
= 5.0V
(Note)
V
CC
= 5.5V; F
CLK
= 3.0 MHz; SO = Open
V
CC
= 2.5V; F
CLK
= 2.0 MHz; SO = Open
V
CC
= 5.5V
V
CC
= 2.5V
CS = V
CC
= 5.5V, Inputs tied to V
CC
or
V
SS
CS = V
CC
= 2.5V, Inputs tied to V
CC
or
V
SS
DC CHARACTERISTICS
Param.
No.
D001
D002
D003
D004
D005
D006
D007
D008
D009
D010
Sym.
V
IH1
V
IH2
V
IL1
V
IL2
V
OL
V
OL
V
OH
I
LI
I
LO
C
INT
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)
D011
D012
D013
I
CC
Read Operating Current
I
CC
Write
I
CCS
Standby Current
—
—
—
—
—
—
1
500
5
3
5
1
mA
μA
mA
mA
μA
μA
Note:
This parameter is periodically sampled and not 100% tested.
DS21204E-page 2
©
2006 Microchip Technology Inc.
25AA040/25LC040/25C040
TABLE 1-2:
AC CHARACTERISTICS
Industrial (I):
Automotive (E):
T
A
= -40°C to +85°C
T
A
= -40°C to +125°C
V
CC
= 1.8V to 5.5V
V
CC
= 4.5V to 5.5V (25C040 only)
AC CHARACTERISTICS
Param
No.
1
Sym.
F
CLK
Characteristic
Clock Frequency
Min.
—
—
—
100
250
500
150
250
475
500
30
50
50
50
100
100
—
—
150
230
475
150
230
475
50
50
—
—
—
0
—
—
—
100
100
200
100
100
200
100
150
200
100
150
200
—
1M
Max.
3
2
1
—
—
—
—
—
—
—
—
—
—
—
—
—
2
2
—
—
—
—
—
—
—
—
150
230
475
—
200
250
500
—
—
—
—
—
—
—
—
—
—
—
—
5
—
Units
MHz
MHz
MHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
μs
μs
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ms
E/W
Cycles
Test Conditions
V
CC
= 4.5V to 5.5V
V
CC
= 2.5V to 4.5V
V
CC
= 1.8V to 2.5V
V
CC
= 4.5V to 5.5V
V
CC
= 2.5V to 4.5V
V
CC
= 1.8V to 2.5V
V
CC
= 4.5V to 5.5V
V
CC
= 2.5V to 4.5V
V
CC
= 1.8V to 2.5V
—
V
CC
= 4.5V to 5.5V
V
CC
= 2.5V to 4.5V
V
CC
= 1.8V to 2.5V
V
CC
= 4.5V to 5.5V
V
CC
= 2.5V to 4.5V
V
CC
= 1.8V to 2.5V
(Note 1)
(Note 1)
V
CC
= 4.5V to 5.5V
V
CC
= 2.5V to 4.5V
V
CC
= 1.8V to 2.5V
V
CC
= 4.5V to 5.5V
V
CC
= 2.5V to 4.5V
V
CC
= 1.8V to 2.5V
—
—
V
CC
= 4.5V to 5.5V
V
CC
= 2.5V to 4.5V
V
CC
= 1.8V to 2.5V
(Note 1)
V
CC
= 4.5V to 5.5V
(Note 1)
V
CC
= 2.5V to 4.5V
(Note 1)
V
CC
= 1.8V to 2.5V
(Note 1)
V
CC
= 4.5V to 5.5V
V
CC
= 2.5V to 4.5V
V
CC
= 1.8V to 2.5V
V
CC
= 4.5V to 5.5V
V
CC
= 2.5V to 4.5V
V
CC
= 1.8V to 2.5V
V
CC
= 4.5V to 5.5V
(Note 1)
V
CC
= 2.5V to 4.5V
(Note 1)
V
CC
= 1.8V to 2.5V
(Note 1)
V
CC
= 4.5V to 5.5V
V
CC
= 2.5V to 4.5V
V
CC
= 1.8V to 2.5V
—
(Note 2)
2
T
CSS
CS Setup Time
3
T
CSH
CS Hold Time
4
5
T
CSD
T
SU
CS Disable Time
Data Setup Time
6
T
HD
Data Hold Time
7
8
9
T
R
T
F
T
HI
CLK Rise Time
CLK Fall Time
Clock High Time
10
T
LO
Clock Low Time
11
12
13
T
CLD
T
CLE
T
V
Clock Delay Time
Clock Enable Time
Output Valid from Clock Low
14
15
T
HO
T
DIS
Output Hold Time
Output Disable Time
16
T
HS
HOLD Setup Time
17
T
HH
HOLD Hold Time
18
T
HZ
HOLD Low to Output High-Z
19
T
HV
HOLD High to Output Valid
20
21
T
WC
—
Note 1:
2:
Internal Write Cycle Time
Endurance
This parameter is periodically sampled and not 100% tested.
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 our web site: www.microchip.com.
©
2006 Microchip Technology Inc.
DS21204E-page 3
Programming Basics
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