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CAT1024, CAT1025
Supervisory Circuits with I C Serial 2k-bit
CMOS EEPROM and Manual Reset
FEATURES
Precision Power Supply Voltage Monitor
— 5V, 3.3V and 3V systems
— Five threshold voltage options
Active High or Low Reset
— Valid reset guaranteed at V
CC
= 1V
400kHz I
2
C Bus
2.7V to 5.5V Operation
Low power CMOS technology
16-Byte Page Write Buffer
Built-in inadvertent write protection
— WP pin (CAT1025)
1,000,000 Program/Erase cycles
Manual Reset Input
100 year data retention
Industrial and extended temperature ranges
Green packages available with NiPdAu Lead
finished
2
DESCRIPTION
The CAT1024 and CAT1025 are complete memory
and supervisory solutions for microcontroller-based
systems. A 2k-bit serial EEPROM memory and a
system power supervisor with brown-out protection
are integrated together in low power CMOS techno–
logy. Memory interface is via a 400kHz I
2
C bus.
The CAT1025 provides a precision V
CC
sense circuit
and two open drain outputs: one (RESET) drives high
¯¯¯¯¯¯
and the other (RESET) drives low whenever V
CC
falls
below the reset threshold voltage. The CAT1025 also
has a Write Protect input (WP). Write operations are
disabled if WP is connected to a logic high.
The CAT1024 also provides a precision V
CC
sense
¯¯¯¯¯¯
circuit, but has only a RESET output and does not
have a Write Protect input.
The power supply monitor and reset circuit protect
memory and system controllers during power up/down
and against brownout conditions. Five reset threshold
voltages support 5V, 3.3V and 3V systems. If power
supply voltages are out of tolerance reset signals
become active, preventing the system microcontroller,
ASIC or peripherals from operating. Reset signals
become inactive typically 200 ms after the supply
voltage exceeds the reset threshold level. With both
active high and low reset signals, interface to
microcontrollers and other ICs is simple. In addition,
¯¯¯¯¯¯
the RESET pin or a separate input, ¯¯¯, can be used
MR
as an input for push-button manual reset capability.
The CAT1024/25 memory features a 16-byte page. In
addition, hardware data protection is provided by a
V
CC
sense circuit that prevents writes to memory
whenever V
CC
falls below the reset threshold or until
V
CC
reaches the reset threshold during power up.
Available packages include an 8-pin DIP and a
surface mount 8-pin SO, 8-pin TSSOP, 8-pin TDFN
and 8-pin MSOP packages. The TDFN package thick-
ness is 0.8mm maximum. TDFN footprint is 3x3mm.
For Ordering Information details, see page 19.
© 2007 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
1
Doc. No. 3008 Rev. N
CAT1024, CAT1025
BLOCK DIAGRAM
EXTERNA LOAD
L
DOUT
ACK
VCC
VSS
WORDADDRESS
BUFFERS
START/STOP
LOGIC
2kbit
EEPROM
COLUMN
DECODERS
SENSEAMPS
SHIFT REGISTERS
THRESHOLD VOLTAGE OPTION
Part Dash
Number
-45
-42
-30
-28
-25
Minimum
Threshold
4.50
4.25
3.00
2.85
2.55
Maximum
Threshold
4.75
4.50
3.15
3.00
2.70
SDA
XDEC
WP*
CONTR
OL
LOGIC
DATA IN STORAGE
HIGHVOLTAGE/
TIMING CONTR
OL
RESET Controller
MR
Precision
Vcc Monitor
STATE COUNTERS
SLAVE
ADDRESS
COMPARATORS
SCL
RESET*
* CAT1025 Only
RESET
PIN CONFIGURATION
DIP Package (L)
SOIC Package (W)
TSSOP Package (Y)
MSOP Package (Z)
¯¯¯
MR
¯¯¯¯¯¯
RESET
NC
V
SS
¯¯¯
MR
¯¯¯¯¯¯
RESET
RESET
V
SS
1
2
3
4
CAT1024
8
7
6
5
V
CC
NC
SCL
SDA
(Bottom View)
TDFN Package: 3mm x 3mm
0.8mm maximum height - (ZD4)
V
CC
8
NC 7
CAT1024
SCL 6
SDA 5
V
CC
8
WDI 7
CAT1025
SCL 6
SDA 5
1
¯¯¯
MR
¯¯¯¯¯¯
2
RESET
3 NC
4 V
SS
1
¯¯¯
MR
¯¯¯¯¯¯
2
RESET
3 RESET
4 V
SS
1
2
3
4
CAT1025
8
7
6
5
V
CC
WP
SCL
SDA
Doc. No. 3008 Rev. N
2
© 2007 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT1024, CAT1025
PIN DESCRIPTION
¯¯¯¯¯¯
RESET/RESET:
RESET OUTPUTs
(RESET CAT1025 Only)
¯¯¯¯¯¯
These are open drain pins and RESET can be used
as a manual reset trigger input. By forcing a reset
condition on the pin the device will initiate and
maintain a reset condition. The RESET pin must be
connected through a pull-down resistor, and the
¯¯¯¯¯¯
RESET pin must be connected through a pull-up
resistor.
SDA:
SERIAL DATA ADDRESS
The bidirectional serial data/address pin is used to
transfer all data into and out of the device. The SDA
pin is an open drain output and can be wire-ORed
with other open drain or open collector outputs.
SCL:
SERIAL CLOCK
Serial clock input.
¯¯¯:
MANUAL RESET INPUT
MR
Manual Reset input is a debounced input that can be
connected to an external source for Manual Reset.
Pulling the MR input low will generate a Reset
condition. Reset outputs are active while ¯¯¯ input is
MR
low and for the reset timeout period after ¯¯¯ returns
MR
to high. The input has an internal pull up resistor.
WP (CAT1025 Only):
WRITE PROTECT INPUT
When WP input is tied to V
SS
or left unconnected write
operations to the entire array are allowed. When tied
to V
CC
, the entire array is protected. This input has an
internal pull down resistor.
PIN FUNCTION
Pin
Name
NC
¯¯¯¯¯¯
RESET
V
SS
SDA
SCL
RESET
V
CC
WP
¯¯¯
MR
Function
No Connect
Active Low Reset Input/Output
Ground
Serial Data/Address
Clock Input
Active High Reset Output
(CAT1025 only)
Power Supply
Write Protect (CAT1025 only)
Manual Reset Input
OPERATING TEMPERATURE RANGE
Industrial
Extended
-40ºC to 85ºC
-40ºC to 125ºC
CAT10XX FAMILY OVERVIEW
Device
CAT1021
CAT1022
CAT1023
CAT1024
CAT1025
CAT1026
Manual
Reset
Input Pin
Watchdog
Watchdog
Monitor
Pin
SDA
SDA
WDI
Write
Protection
Pin
Independent
Auxiliary
Voltage Sense
RESET:
Active High
and LOW
EEPROM
2k
2k
2k
2k
2k
2k
CAT1027
WDI
2k
For supervisory circuits with embedded 16k EEPROM, please refer to the CAT1161, CAT1162 and CAT1163
data sheets.
© 2007 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
3
Doc. No. 3008 Rev. N
CAT1024, CAT1025
ABSOLUTE MAXIMUM RATINGS
(1)
Parameters
Temperature Under Bias
Storage Temperature
Voltage on any Pin with Respect to Ground
(2)
V
CC
with Respect to Ground
Package Power Dissipation Capability (T
A
= 25°C)
Lead Soldering Temperature (10 secs)
Output Short Circuit Current
(3)
Ratings
–55 to +125
–65 to +150
–2.0 to V
CC
+ 2.0
–2.0 to 7.0
1.0
300
100
Units
ºC
ºC
V
V
W
ºC
mA
D.C. OPERATING CHARACTERISTICS
V
CC
= 2.7V to 5.5V and over the recommended temperature conditions unless otherwise specified.
Symbol
I
LI
I
LO
I
CC1
I
CC2
I
SB
V
IL(4)
V
IH(4)
V
OL
V
OH
Parameter
Input Leakage Current
Output Leakage Current
Power Supply Current (Write)
Power Supply Current (Read)
Standby Current
Input Low Voltage
Input High Voltage
Output Low Voltage
¯¯¯¯¯¯
(SDA, RESET)
Output High Voltage
(RESET)
I
OL
= 3mA
V
CC
= 2.7V
I
OH
= -0.4mA
V
CC
= 2.7V
CAT102x-45
(V
CC
= 5.0V)
CAT102x-42
(V
CC
= 5.0V)
V
TH
Reset Threshold
CAT102x-30
(V
CC
= 3.3V)
CAT102x-28
(V
CC
= 3.3V)
CAT102x-25
(V
CC
= 3.0V)
V
RVALID
V
RT
(5)
Test Conditions
V
IN
= GND to Vcc
V
IN
= GND to Vcc
f
SCL
= 400kHz
V
CC
= 5.5V
f
SCL
= 400kHz
V
CC
= 5.5V
Vcc = 5.5V,
V
IN
= GND or Vcc
Min
-2
-10
Typ
Max
10
10
3
1
40
Units
µA
µA
mA
mA
µA
V
V
V
V
-0.5
0.7 x Vcc
0.3 x Vcc
Vcc + 0.5
0.4
Vcc - 0.75
4.50
4.25
3.00
2.85
2.55
1.00
15
4.75
4.50
3.15
3.00
2.70
V
Reset Output Valid V
CC
Voltage
Reset Threshold Hysteresis
V
mV
Notes:
(1) Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings
only, and functional operation of the device at these or any other conditions outside of those listed in the operational sections of this
specification is not implied. Exposure to any absolute maximum rating for extended periods may affect device performance and reliability.
(2) The minimum DC input voltage is –0.5V. During transitions, inputs may undershoot to –2.0V for periods of less than 20 ns. Maximum DC
voltage on output pins is V
CC
+0.5V, which may overshoot to V
CC
+2.0V for periods of less than 20 ns.
(3) Output shorted for no more than one second. No more than one output shorted at a time.
(4) V
IL
min and V
IH
max are reference values only and are not tested.
(5) This parameter is tested initially and after a design or process change that affects the parameter. Not 100% tested.
Doc. No. 3008 Rev. N
4
© 2007 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
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