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Datasheet: 25LC256 (Microchip Technology)

256K SPI Bus Serial EEPROM

 

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2003 Microchip Technology Inc.
Preliminary
DS21822C-page 1
25AA256/25LC256
Device Selection Table
Features
Max. clock 10 MHz
Low-power CMOS technology
- Max. Write Current: 5 mA at 5.5V, 10 MHz
- Read Current: 5 mA at 5.5V, 10 MHz
- Standby Current: 1
A at 5.5V
32,768 x 8-bit organization
64 byte page
Self-timed ERASE and WRITE cycles (5 ms
max.)
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;
Standard and Pb-free packages available
Pin Function Table
Description
The Microchip Technology Inc. 25AA256/25LC256
(25XX256
*
) are 256k-bit Serial Electrically Erasable
PROMs. The memory is accessed via a simple Serial
Peripheral InterfaceTM (SPITM) 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.
The 25XX256 is available in standard packages
including 8-lead PDIP and SOIC, and advanced
packaging including 8-lead DFN and 8-lead TSSOP.
Pb-free (Pure Sn) finish is also available.
Package Types (not to scale)
Part Number
V
CC
Range
Page Size
Temp. Ranges
Packages
25LC256
2.5-5.5V
64 Byte
I, E
P, SN, ST, MF
25AA256
1.8-5.5V
64 Byte
I
P, SN, ST, MF
- Industrial (I):
-40
C to
+85
C
- Automotive (E):
-40C to +125C
Name
Function
CS
Chip Select Input
SO
Serial Data Output
WP
Write-Protect
V
SS
Ground
SI
Serial Data Input
SCK
Serial Clock Input
HOLD
Hold Input
V
CC
Supply Voltage
25L
C256
CS
SO
WP
V
SS
1
2
3
4
8
7
6
5
V
CC
HOLD
SCK
SI
PDIP/SOIC
(P, SN)
TSSOP
CS
SO
WP
V
SS
1
2
3
4
8
7
6
5
V
CC
HOLD
SCK
SI
(ST)
DFN
CS
SO
WP
V
SS
HOLD
SCK
SI
25
LC
2
5
6
5
6
7
8
4
3
2
1
V
CC
(MF)
256K SPI
TM
Bus Serial EEPROM
SPI is a registered trademark of Motorola Corporation.
* 25XX256
is used in this document as a generic part number for the 25AA256, 25LC256 devices.
25AA256/25LC256
DS21822C-page 2
Preliminary
2003 Microchip Technology Inc.
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 .................................................................................................................................-65C to 150C
Ambient temperature under bias ...............................................................................................................-40C to 125C
ESD protection on all pins .......................................................................................................................................... 4 kV
TABLE 1-1:
DC CHARACTERISTICS
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.
DC CHARACTERISTICS
Industrial (I):
T
A
= -40C to +85C
V
CC
= 1.8V to 5.5V
Automotive (E): T
A
= -40C to +125C
V
CC
= 2.5V to 5.5V
Param.
No.
Sym.
Characteristic
Min.
Max.
Units
Test Conditions
D001
V
IH1
High-level input
voltage
.7 V
CC
V
CC
+1
V
D002
V
IL1
Low-level input
voltage
-0.3
0.3V
CC
V
V
CC
2.7V
D003
V
IL2
-0.3
0.2V
CC
V
V
CC
< 2.7V
D004
V
OL
Low-level output
voltage
--
0.4
V
I
OL
= 2.1 mA
D005
V
OL
--
0.2
V
I
OL
= 1.0 mA, V
CC
< 2.5V
D006
V
OH
High-level output
voltage
V
CC
-0.5
--
V
I
OH
= -400
A
D007
I
LI
Input leakage current
--
1
A
CS = V
CC
, V
IN
= V
SS
TO
V
CC
D008
I
LO
Output leakage
current
--
1
A
CS = V
CC
, V
OUT
= V
SS
TO
V
CC
D009
C
INT
Internal Capacitance
(all inputs and
outputs)
--
7
pF
T
A
= 25C, CLK = 1.0 MHz,
V
CC
= 5.0V (Note)
D010
I
CC
Read
Operating Current
--
--
5
2.5
mA
mA
V
CC
= 5.5V; F
CLK
= 10.0 MHz;
SO = Open
V
CC
= 2.5V; F
CLK
= 5.0 MHz;
SO = Open
D011
I
CC
Write
--
--
5
3
mA
mA
V
CC
= 5.5V
V
CC
= 2.5V
D012
I
CCS
Standby Current
--
--
5
1
A
A
CS = V
CC
= 5.5V, Inputs tied to V
CC
or
V
SS
, 125C
CS = V
CC
= 5.5V, Inputs tied to V
CC
or
V
SS
, 85C
Note:
This parameter is periodically sampled and not 100% tested.
2003 Microchip Technology Inc.
Preliminary
DS21822C-page 3
25AA256/25LC256
TABLE 1-2:
AC CHARACTERISTICS
AC CHARACTERISTICS
Industrial (I):
T
A
= -40C to +85C
V
CC
= 1.8V to 5.5V
Automotive (E): T
A
= -40C to +125C
V
CC
= 2.5V to 5.5V
Param.
No.
Sym.
Characteristic
Min.
Max.
Units
Test Conditions
1
F
CLK
Clock Frequency
--
--
--
10
5
3
MHz
MHz
MHz
4.5V
Vcc
5.5V
2.5V
Vcc
<
4.5V
1.8V
Vcc
<
2.5V
2
T
CSS
CS Setup Time
50
100
150
--
--
--
ns
ns
ns
4.5V
Vcc
5.5V
2.5V
Vcc
<
4.5V
1.8V
Vcc
<
2.5V
3
T
CSH
CS Hold Time
100
200
250
--
--
--
ns
ns
ns
4.5V
Vcc
5.5V
2.5V
Vcc
<
4.5V
1.8V
Vcc
<
2.5V
4
T
CSD
CS Disable Time
50
--
ns
--
5
Tsu
Data Setup Time
10
20
30
--
--
--
ns
ns
ns
4.5V
Vcc
5.5V
2.5V
Vcc
<
4.5V
1.8V
Vcc
<
2.5V
6
T
HD
Data Hold Time
20
40
50
--
--
--
ns
ns
ns
4.5V
Vcc
5.5V
2.5V
Vcc
<
4.5V
1.8V
Vcc
<
2.5V
7
T
R
CLK Rise Time
--
2
s
(Note 1)
8
T
F
CLK Fall Time
--
2
s
(Note 1)
9
T
HI
Clock High Time
50
100
150
--
--
--
ns
ns
ns
4.5V
Vcc
5.5V
2.5V
Vcc
<
4.5V
1.8V
Vcc
<
2.5V
10
T
LO
Clock Low Time
50
100
150
--
--
--
ns
ns
ns
4.5V
Vcc
5.5V
2.5V
Vcc
<
4.5V
1.8V
Vcc
<
2.5V
11
T
CLD
Clock Delay Time
50
--
ns
--
12
T
CLE
Clock Enable Time
50
--
ns
--
13
T
V
Output Valid from Clock
Low
--
--
--
50
100
160
ns
ns
ns
4.5V
Vcc
5.5V
2.5V
Vcc
<
4.5V
1.8V
Vcc
<
2.5V
14
T
HO
Output Hold Time
0
--
ns
(Note 1)
15
T
DIS
Output Disable Time
--
--
--
40
80
160
ns
ns
ns
4.5V
Vcc
5.5V(Note 1)
2.5V
Vcc
4.5V(Note 1)
1.8V
Vcc
2.5V(Note 1)
16
T
HS
HOLD Setup Time
20
40
80
--
--
--
ns
ns
ns
4.5V
Vcc
5.5V
2.5V
Vcc
<
4.5V
1.8V
Vcc
<
2.5V
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. For endurance estimates in a specific
application, please consult the Total EnduranceTM Model which can be obtained from our web site:
www.microchip.com.
25AA256/25LC256
DS21822C-page 4
Preliminary
2003 Microchip Technology Inc.
TABLE 1-3:
AC TEST CONDITIONS
17
T
HH
HOLD Hold Time
20
40
80
--
--
--
ns
ns
ns
4.5V
Vcc
5.5V
2.5V
Vcc
<
4.5V
1.8V
Vcc
<
2.5V
18
T
HZ
HOLD Low to Output
High-Z
30
60
160
--
--
--
ns
ns
ns
4.5V
Vcc
5.5V(Note 1)
2.5V
Vcc
<
4.5V(Note 1)
1.8V
Vcc
<
2.5V(Note 1)
19
T
HV
HOLD High to Output
Valid
30
60
160
--
--
--
ns
ns
ns
4.5V
Vcc
5.5V
2.5V
Vcc
<
4.5V
1.8V
Vcc
<
2.5V
20
T
WC
Internal Write Cycle Time
--
5
ms
(N
OTE
2)
21
--
Endurance
1M
--
E/W
Cycles
(N
OTE
3)
TABLE 1-2:
AC CHARACTERISTICS (CONTINUED)
AC CHARACTERISTICS
Industrial (I):
T
A
= -40C to +85C
V
CC
= 1.8V to 5.5V
Automotive (E): T
A
= -40C to +125C
V
CC
= 2.5V to 5.5V
Param.
No.
Sym.
Characteristic
Min.
Max.
Units
Test Conditions
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. For endurance estimates in a specific
application, please consult the Total EnduranceTM Model which can be obtained from our web site:
www.microchip.com.
AC Waveform:
V
LO
= 0.2V
--
V
H I
= V
CC
- 0.2V
(Note 1)
V
H I
= 4.0V
(Note 2)
C
L
= 100 pF
--
Timing Measurement Reference Level
Input
0.5 V
CC
Output
0.5 V
CC
Note 1: For V
CC
4.0V
2: For Vcc > 4.0V
2003 Microchip Technology Inc.
Preliminary
DS21822C-page 5
25AA256/25LC256
FIGURE 1-1:
HOLD TIMING
FIGURE 1-2:
SERIAL INPUT TIMING
FIGURE 1-3:
SERIAL OUTPUT TIMING
CS
SCK
SO
SI
HOLD
17
16
16
17
19
18
don't care
5
high-impedance
n+2
n+1
n
n-1
n
n+2
n+1
n
n
n-1
CS
SCK
SI
SO
6
5
8
7
11
3
LSB in
MSB in
high-impedance
12
Mode 1,1
Mode 0,0
2
4
CS
SCK
SO
10
9
13
MSB out
ISB out
3
15
don't care
SI
Mode 1,1
Mode 0,0
14
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