* Note: Pins 3, 4 and 17, 18 are internally connected for 14-lead TSSOP socket compatibility.
SPI Serial
E
2
PROMs
128K (16384 x 8)
AT25128
Preliminary
Features
Serial Peripheral Interface (SPI) Compatible
Supports SPI Modes 0 (0,0) and 3 (1,1)
Low Voltage and Standard Voltage Operation
5.0 (V
CC
= 4.5V to 5.5V)
2.7 (V
CC
= 2.7V to 5.5V)
1.8 (V
CC
= 1.8V to 3.6V)
2.1 MHz Clock Rate
32-Byte Page Mode
Block Write Protection
Protect 1/4, 1/2, or Entire Array
Write Protect (WP) Pin and Write Disable Instructions for
Both Hardware and Software Data Protection
Self-Timed Write Cycle (5 ms Typical)
High Reliability
Endurance: 100,000 Cycles
Data Retention: 100 Years
Automotive Grade and Extended Temperature Devices Available
8-Pin PDIP, 14-pin, 16-pin JEDEC SOIC, and 20-Pin TSSOP Packages
Description
The AT25128 provides 131,072 bits of serial electrically erasable programmable read
only memory (EEPROM) organized as 16,384 words of 8 bits each. The device is
optimized for use in many industrial and commercial applications where low power
and low voltage operation are essential. The AT25128 is available in space saving
8-pin PDIP, JEDEC SOIC, and 14-pin and 20-pin TSSOP packages.
(continued)
Pin Configurations
Pin Name
Function
CS
Chip Select
SCK
Serial Data Clock
SI
Serial Data Input
SO
Serial Data Output
GND
Ground
V
CC
Power Supply
WP
Write Protect
HOLD
Suspends Serial Input
NC
No Connect
DC
Don't Connect
1
2
3
4
8
7
6
5
CS
SO
WP
GND
VCC
HOLD
SCK
SI
8-Pin PDIP
1
2
3
4
5
6
7
14
13
12
11
10
9
8
CS
SO
NC
NC
NC
WP
GND
VCC
HOLD
NC
NC
NC
SCK
SI
14-Pin SOIC
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
CS
SO
NC
NC
NC
NC
WP
GND
VCC
HOLD
NC
NC
NC
NC
SCK
SI
16-Lead SOIC
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
NC
CS
SO
SO
NC
NC
WP
GND
DC
NC
NC
VCC
HOLD
HOLD
NC
NC
SCK
SI
DC
NC
20-Lead TSSOP*
Block Diagram
Operating Temperature................... -55C to +125C
Storage Temperature...................... -65C to +150C
Voltage on Any Pin
with Respect to Ground ..................... -1.0V to +7.0V
Maximum Operating Voltage ........................... 6.25V
DC Output Current ......................................... 5.0 mA
*NOTICE: Stresses beyond those listed under "Absolute Maxi-
mum 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 beyond those indi-
cated in the operational sections of this specification is not
implied. Exposure to absolute maximum rating conditions
for extended periods may affect device reliability.
Absolute Maximum Ratings*
The AT25128 is enabled through the Chip Select pin (CS)
and accessed via a 3-wire interface consisting of Serial
Data Input (SI), Serial Data Output (SO), and Serial Clock
(SCK). All programming cycles are completely self-timed,
and no separate ERASE cycle is required before WRITE.
BLOCK WRITE protection is enabled by programming the
status register with one of four blocks of write protection.
Separate program enable and program disable instruc-
tions are provided for additional data protection. Hardware
data protection is provided via the WP pin to protect
against inadvertent write attempts to the status register.
The HOLD pin may be used to suspend any serial commu-
nication without resetting the serial sequence.
Description (Continued)
2
AT25128
DC Characteristics
Applicable over recommended operating range from: T
AI
= -40C to +85C, V
CC
= +1.8V to +5.5V,
T
AC
= 0C to +70C, V
CC
= +1.8V to +5.5V (unless otherwise noted).
Symbol
Parameter
Test Condition
Min
Typ
Max
Units
V
CC1
Supply
Voltage
1.8
3.6
V
V
CC2
Supply Voltage
2.7
5.5
V
V
CC3
Supply Voltage
4.5
5.5
V
I
CC1
Supply Current
V
CC
= 5.0V at 1 MHz,
SO = Open
3.0
mA
I
CC2
Supply Current
V
CC
= 5.0V at 2 MHz,
SO = Open
5.0
mA
I
SB1
Standby
Current
V
CC
= 1.8V
CS = V
CC
0.1
A
I
SB2
Standby Current
V
CC
= 2.7V
CS = V
CC
0.2
0.5
A
I
SB3
Standby Current
V
CC
= 5.0V
CS = V
CC
0.5
2.0
A
I
IL
Input Leakage
V
IN
= 0V to V
CC
-3.0
3.0
A
I
OL
Output Leakage
V
IN
= 0V to V
CC
,
T
AC
= 0
C to 70
C
-3.0
3.0
A
V
IL
(1)
Input Low Voltage
-1.0
V
CC
x 0.3
V
V
IH
(1)
Input High Voltage
V
CC
x 0.7
V
CC
+ 0.5
V
V
OL1
Output Low Voltage
4.5V
V
CC
5.5V
I
OL
= 3.0 mA
0.4
V
V
OH1
Output High Voltage
I
OH
= -1.6 mA
V
CC
- 0.8
V
V
OL2
Output Low Voltage
1.8V
V
CC
3.6V
I
OL
= 0.15 mA
0.2
V
V
OH2
Output High Voltage
I
OH
= -100
A
V
CC
- 0.2
V
Note:
1. V
IL
min and V
IH
max are reference only and are not tested.
Pin Capacitance
(1)
Applicable over recommended operating range from T
A
= 25C, f = 1.0 MHz, V
CC
= +5.0V (unless otherwise noted).
Test Conditions
Max
Units
Conditions
C
OUT
Output Capacitance (SO)
8
pF
V
OUT
= 0V
C
IN
Input Capacitance (CS, SCK, SI, WP, HOLD)
6
pF
V
IN
= 0V
Note:
1. This parameter is characterized and is not 100% tested.
AT25128
3
(continued)
AC Characteristics
Applicable over recommended operating range from T
A
= -40C to +85C, V
CC
= As Specified,
CL = 1 TTL Gate and 100 pF (unless otherwise noted).
Symbol
Parameter
Voltage
Min
Max
Units
f
SCK
SCK Clock Frequency
4.5 - 5.5
2.7 - 5.5
1.8 - 3.6
0
0
0
2.1
2.1
0.5
MHz
t
RI
Input Rise Time
4.5 - 5.5
2.7 - 5.5
1.8 - 3.6
2
2
2
s
t
FI
Input Fall Time
4.5 - 5.5
2.7 - 5.5
1.8 - 3.6
2
2
2
s
t
WH
SCK High Time
4.5 - 5.5
2.7 - 5.5
1.8 - 3.6
200
300
800
ns
t
WL
SCK Low Time
4.5 - 5.5
2.7 - 5.5
1.8 - 3.6
200
200
800
ns
t
CS
CS High Time
4.5 - 5.5
2.7 - 5.5
1.8 - 3.6
250
250
1000
ns
t
CSS
CS Setup Time
4.5 - 5.5
2.7 - 5.5
1.8 - 3.6
250
250
1000
ns
t
CSH
CS Hold Time
4.5 - 5.5
2.7 - 5.5
1.8 - 3.6
250
250
1000
ns
t
SU
Data In Setup Time
4.5 - 5.5
2.7 - 5.5
1.8 - 3.6
50
50
100
ns
t
H
Data In Hold Time
4.5 - 5.5
2.7 - 5.5
1.8 - 3.6
50
50
100
ns
t
HD
Hold Setup Time
4.5 - 5.5
2.7 - 5.5
1.8 - 3.6
100
100
400
ns
t
CD
Hold Hold Time
4.5 - 5.5
2.7 - 5.5
1.8 - 3.6
100
100
400
ns
t
V
Output Valid
4.5 - 5.5
2.7 - 5.5
1.8 - 3.6
0
0
0
200
200
800
ns
t
HO
Output Hold Time
4.5 - 5.5
2.7 - 5.5
1.8 - 3.6
0
0
0
ns
t
LZ
Hold to Output Low Z
4.5 - 5.5
2.7 - 5.5
1.8 - 3.6
0
0
0
100
100
100
ns
4
AT25128
Symbol
Parameter
Voltage
Min
Max
Units
t
HZ
Hold to Output High Z
4.5 - 5.5
2.7 - 5.5
1.8 - 3.6
100
100
100
ns
t
DIS
Output Disable Time
4.5 - 5.5
2.7 - 5.5
1.8 - 3.6
250
250
1000
ns
t
WC
Write Cycle Time
4.5 - 5.5
2.7 - 5.5
1.8 - 3.6
5
10
20
ms
AC Characteristics (Continued)
AT25128
5
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