CAT25128
128-Kb SPI Serial CMOS
EEPROM
Description
The CAT25128 is a 128−Kb Serial CMOS EEPROM device
internally organized as 16Kx8 bits. This features a 64−byte page write
buffer and supports the Serial Peripheral Interface (SPI) protocol. The
device is enabled through a Chip Select (CS) input. In addition, the
required bus signals are clock input (SCK), data input (SI) and data
output (SO) lines. The HOLD input may be used to pause any serial
communication with the CAT25128 device. The device features
software and hardware write protection, including partial as well as
full array protection.
Features
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SOIC−8
V SUFFIX
CASE 751BD
TDFN−8
VP2 SUFFIX
CASE 511AK
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10 MHz SPI Compatible
1.8 V to 5.5 V Supply Voltage Range
SPI Modes (0,0) & (1,1)
64−byte Page Write Buffer
Self−timed Write Cycle
Hardware and Software Protection
Block Write Protection
−
Protect 1/4, 1/2 or Entire EEPROM Array
Low Power CMOS Technology
1,000,000 Program/Erase Cycles
100 Year Data Retention
Industrial and Extended Temperature Range
8−lead PDIP, SOIC, TSSOP and 8−pad TDFN Packages
This Device is Pb−Free, Halogen Free/BFR Free, and RoHS
Compliant
V
CC
PDIP−8
L SUFFIX
CASE 646AA
TSSOP−8
Y SUFFIX
CASE 948AL
PIN CONFIGURATION
CS
SO
WP
V
SS
1
V
CC
HOLD
SCK
SI
PDIP (L), SOIC (V), TS-
SOP (Y), TDFN (VP2)
PIN FUNCTION
Pin Name
Function
Chip Select
Serial Data Output
Write Protect
Ground
Serial Data Input
Serial Clock
Hold Transmission Input
Power Supply
CS
SO
SI
CS
WP
HOLD
SCK
V
SS
CAT25128
SO
WP
V
SS
SI
SCK
HOLD
V
CC
Figure 1. Functional Symbol
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 16 of this data sheet.
©
Semiconductor Components Industries, LLC, 2011
February, 2011
−
Rev. 4
1
Publication Order Number:
CAT25128/D
CAT25128
Table 1. ABSOLUTE MAXIMUM RATINGS
Parameters
Operating Temperature
Storage Temperature
Voltage on any Pin with Respect to Ground (Note 1)
Ratings
−45
to +130
−65
to +150
−0.5
to +6.5
Units
°C
°C
V
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
1. The DC input voltage on any pin should not be lower than
−0.5
V or higher than V
CC
+ 0.5 V. During transitions, the voltage on any pin may
undershoot to no less than
−1.5
V or overshoot to no more than V
CC
+ 1.5 V, for periods of less than 20 ns.
Table 2. RELIABILITY CHARACTERISTICS
(Note 2)
Symbol
N
END
(Note 3)
T
DR
Endurance
Data Retention
Parameter
Min
1,000,000
100
Units
Program / Erase Cycles
Years
2. These parameters are tested initially and after a design or process change that affects the parameter according to appropriate AEC−Q100
and JEDEC test methods.
3. Page Mode, V
CC
= 5 V, 25°C.
Table 3. D.C. OPERATING CHARACTERISTICS
Symbol
I
CCR
I
CCW
I
SB1
Parameter
Supply Current
(Read Mode)
Supply Current
(Write Mode)
Standby Current
(
V
CC
= 1.8 V to 5.5 V, T
A
=
−40°C
to +85°C and V
CC
= 2.5 V to 5.5 V, T
A
=
−40°C
to +125°C, unless otherwise specified.)
Test Conditions
Read, V
CC
= 5.5 V,
SO open
Write, V
CC
= 5.5 V,
SO open
V
IN
= GND or V
CC
, CS = V
CC
,
WP = V
CC
, HOLD = V
CC
,
V
CC
= 5.5 V
V
IN
= GND or V
CC
, CS = V
CC
,
WP = GND, HOLD = GND,
V
CC
= 5.5 V
V
IN
= GND or V
CC
CS = V
CC
,
V
OUT
= GND or V
CC
T
A
=
−40°C
to +85°C
T
A
=
−40°C
to +125°C
10 MHz /
−40°C
to 85°C
5 MHz /
−40°C
to 125°C
10 MHz /
−40°C
to 85°C
5 MHz /
−40°C
to 125°C
T
A
=
−40°C
to +85°C
T
A
=
−40°C
to +125°C
T
A
=
−40°C
to +85°C
T
A
=
−40°C
to +125°C
−2
−1
−1
−0.5
0.7 V
CC
V
CC
> 2.5 V, I
OL
= 3.0 mA
V
CC
> 2.5 V, I
OH
=
−1.6
mA
V
CC
> 1.8 V, I
OL
= 150
mA
V
CC
> 1.8 V, I
OH
=
−100
mA
V
CC
−
0.2 V
V
CC
−
0.8 V
0.2
Min
Max
2
2
4
4
1
3
4
5
2
1
2
0.3 V
CC
V
CC
+ 0.5
0.4
Units
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
V
V
V
V
V
V
I
SB2
Standby Current
I
L
I
LO
V
IL
V
IH
V
OL1
V
OH1
V
OL2
V
OH2
Input Leakage Current
Output Leakage
Current
Input Low Voltage
Input High Voltage
Output Low Voltage
Output High Voltage
Output Low Voltage
Output High Voltage
Table 4. PIN CAPACITANCE
(Note 2) (T
A
= 25°C, f = 1.0 MHz, V
CC
= +5.0 V)
Symbol
C
OUT
C
IN
Output Capacitance (SO)
Input Capacitance (CS, SCK, SI, WP, HOLD)
Test
Conditions
V
OUT
= 0 V
V
IN
= 0 V
Min
Typ
Max
8
8
Units
pF
pF
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CAT25128
Table 5. A.C. CHARACTERISTICS
(T
A
=
−40°C
to +85°C (Industrial) and T
A
=
−40°C
to +125°C (Extended).) (Notes 4, 7)
V
CC
= 1.8 V
−
5.5 V /
−405C
to +855C
V
CC
= 2.5 V
−
5.5 V /
−405C
to +1255C
Symbol
f
SCK
t
SU
t
H
t
WH
t
WL
t
LZ
t
RI
(Note 5)
t
FI
(Note 5)
t
HD
t
CD
t
V
t
HO
t
DIS
t
HZ
t
CS
t
CSS
t
CSH
t
CNS
t
CNH
t
WPS
t
WPH
t
WC
(Note 6)
Parameter
Clock Frequency
Data Setup Time
Data Hold Time
SCK High Time
SCK Low Time
HOLD to Output Low Z
Input Rise Time
Input Fall Time
HOLD Setup Time
HOLD Hold Time
Output Valid from Clock Low
Output Hold Time
Output Disable Time
HOLD to Output High Z
CS High Time
CS Setup Time
CS Hold Time
CS Inactive Setup Time
CS Inactive Hold Time
WP Setup Time
WP Hold Time
Write Cycle Time
140
30
30
20
20
10
100
5
0
50
100
70
15
15
15
15
10
60
5
0
10
75
0
20
25
Min
DC
40
40
75
75
50
2
2
0
10
40
Max
5
V
CC
= 2.5 V
−
5.5 V
−405C
to +855C
Min
DC
20
20
40
40
25
2
2
Max
10
Units
MHz
ns
ns
ns
ns
ns
ms
ms
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ms
4. AC Test Conditions:
Input Pulse Voltages: 0.3 V
CC
to 0.7 V
CC
Input rise and fall times:
≤
10 ns
Input and output reference voltages: 0.5 V
CC
Output load: current source I
OL max
/I
OH max
; C
L
= 50 pF
5. This parameter is tested initially and after a design or process change that affects the parameter.
6. t
WC
is the time from the rising edge of CS after a valid write sequence to the end of the internal write cycle.
7.
All Chip Select (CS) timing parameters are defined relative to the positive clock edge (Figure 2). t
CSH
timing specification is valid
for die revision D and higher. The die revision D is identified by letter “D” or a dedicated marking code on top of the package. For
previous product revision (Rev.C) the t
CSH
is defined relative to the negative clock edge.
Table 6. POWER−UP TIMING
(Notes 5, 8)
Symbol
t
PUR
t
PUW
Power−up to Read Operation
Power−up to Write Operation
Parameter
Max
1
1
Units
ms
ms
8. t
PUR
and t
PUW
are the delays required from the time V
CC
is stable until the specified operation can be initiated.
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CAT25128
Pin Description
SI:
The serial data input pin accepts op−codes, addresses
and data. In SPI modes (0,0) and (1,1) input data is latched
on the rising edge of the SCK clock input.
SO:
The serial data output pin is used to transfer data out of
the device. In SPI modes (0,0) and (1,1) data is shifted out
on the falling edge of the SCK clock.
SCK:
The serial clock input pin accepts the clock provided
by the host and used for synchronizing communication
between host and CAT25128.
CS:
The chip select input pin is used to enable/disable the
CAT25128. When CS is high, the SO output is tri−stated (high
impedance) and the device is in Standby Mode (unless an
internal write operation is in progress).
Every communication
session between host and CAT25128 must be preceded by a
high to low transition and concluded with a low to high
transition of the CS input.
WP:
The write protect input pin will allow all write
operations to the device when held high. When WP pin is
tied low and the WPEN bit in the Status Register (refer to
Status Register description, later in this Data Sheet) is set to
“1”, writing to the Status Register is disabled.
HOLD:
The HOLD input pin is used to pause transmission
between host and CAT25128, without having to retransmit
the entire sequence at a later time. To pause, HOLD must be
taken low and to resume it must be taken back high, with the
SCK input low during both transitions. When not used for
pausing, it is recommended the HOLD input to be tied to
V
CC
, either directly or through a resistor.
Functional Description
The CAT25128 device supports the Serial Peripheral
Interface (SPI) bus protocol, modes (0,0) and (1,1). The
device contains an 8−bit instruction register. The instruction
set and associated op−codes are listed in Table 7.
Reading data stored in the CAT25128 is accomplished by
simply providing the READ command and an address.
Writing to the CAT25128, in addition to a WRITE
command, address and data, also requires enabling the
device for writing by first setting certain bits in a Status
Register, as will be explained later.
After a high to low transition on the CS input pin, the
CAT25128 will accept any one of the six instruction
op−codes listed in Table 7 and will ignore all other possible
8−bit combinations. The communication protocol follows
the timing from Figure 2.
Table 7. INSTRUCTION SET
Instruction
WREN
WRDI
RDSR
WRSR
READ
WRITE
Opcode
0000 0110
0000 0100
0000 0101
0000 0001
0000 0011
0000 0010
t
CS
Operation
Enable Write Operations
Disable Write Operations
Read Status Register
Write Status Register
Read Data from Memory
Write Data to Memory
CS
t
CNH
SCK
t
SU
SI
t
H
VALID
IN
t
V
t
HO
SO
HI−Z
VALID
OUT
HI−Z
t
V
t
DIS
t
RI
t
FI
t
CSS
t
WH
t
WL
t
CSH
t
CNS
Figure 2. Synchronous Data Timing
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CAT25128
Status Register
The Status Register, as shown in Table 8, contains a
number of status and control bits.
The RDY (Ready) bit indicates whether the device is busy
with a write operation. This bit is automatically set to 1 during
an internal write cycle, and reset to 0 when the device is ready
to accept commands. For the host, this bit is read only.
The WEL (Write Enable Latch) bit is set/reset by the
WREN/WRDI commands. When set to 1, the device is in a
Write Enable state and when set to 0, the device is in a Write
Disable state.
The BP0 and BP1 (Block Protect) bits determine which
blocks are currently write protected. They are set by the user
with the WRSR command and are non−volatile. The user is
Table 8. STATUS REGISTER
7
WPEN
6
0
5
0
4
0
allowed to protect a quarter, one half or the entire memory,
by setting these bits according to Table 9. The protected
blocks then become read−only.
The WPEN (Write Protect Enable) bit acts as an enable for
the WP pin. Hardware write protection is enabled when the
WP pin is low and the WPEN bit is 1. This condition
prevents writing to the status register and to the block
protected sections of memory. While hardware write
protection is active, only the non−block protected memory
can be written. Hardware write protection is disabled when
the WP pin is high or the WPEN bit is 0. The WPEN bit, WP
pin and WEL bit combine to either permit or inhibit Write
operations, as detailed in Table 10.
3
BP1
2
BP0
1
WEL
0
RDY
Table 9. BLOCK PROTECTION BITS
Status Register Bits
BP1
0
0
1
1
BP0
0
1
0
1
Array Address Protected
None
3000−3FFF
2000−3FFF
0000−3FFF
Protection
No Protection
Quarter Array Protection
Half Array Protection
Full Array Protection
Table 10. WRITE PROTECT CONDITIONS
WPEN
0
0
1
1
X
X
WP
X
X
Low
Low
High
High
WEL
0
1
0
1
0
1
Protected Blocks
Protected
Protected
Protected
Protected
Protected
Protected
Unprotected Blocks
Protected
Writable
Protected
Writable
Protected
Writable
Status Register
Protected
Writable
Protected
Protected
Protected
Writable
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