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Main Menu
CAT1161/2 (16K)
Supervisory Circuits with I
2
C Serial CMOS EEPROM, Precision Reset Controller and Watchdog Timer
FEATURES
s
Watchdog monitors SDA signal (CAT1161)
s
400kHz I
2
C bus compatible
s
2.7V to 6.0V operation
s
Low power CMOS technology
s
16-Byte page write buffer
s
Built-in inadvertent write protection
s
Active high or low reset
— Precision power supply voltage monitor
— 5V, 3.3V and 3V systems
— Five threshold voltage options
s
1,000,000 Program/Erase cycles
s
Manual Reset
s
100 Year data retention
s
8-pin DIP or 8-pin SOIC
s
Commercial and industrial temperature ranges
— V
CC
lock out
— Write protect pin, WP
DESCRIPTION
The CAT1161/2 is a complete memory and supervisory
solution for microcontroller-based systems. A serial
EEPROM memory (16K) with hardware memory write
protection, a system power supervisor with brown out
protection and a watchdog timer are integrated together
in low power CMOS technology. Memory interface is via
an I
2
C bus.
The 1.6-second watchdog circuit returns a system to a
known good state if a software or hardware glitch halts
or “hangs” the system. The CAT1161 watchdog monitors
the SDA line, making an additional PC board trace
unnecessary. The lower cost CAT1162 does not have a
watchdog timer.
The power supply monitor and reset circuit protects
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, a
reset pin can be used as a debounced input for push-button
manual reset capability.
The CAT1161/2 memory features a 16-byte page. In addition,
hardware data protection is provided by a write protect pin
WP and 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 package.
PIN CONFIGURATION
DC
RESET
WP
GND
VCC
BLOCK DIAGRAM
EXTERNAL LOAD
DOUT
ACK
VCC
GND
WORD ADDRESS
BUFFERS
COLUMN
DECODERS
SENSE AMPS
SHIFT REGISTERS
CAT1161/2
RESET
SCL
SDA
SDA
START/STOP
LOGIC
16K
EEPROM
XDEC
DC = Do not connect
WP
CONTROL
LOGIC
Part Dash Minimum
Number Threshold
-45
-42
-30
-28
-25
4.50
4.25
3.00
2.85
2.55
Maximum
Threshold
4.75
4.50
RESET Controller
DATA IN STORAGE
HIGH VOLTAGE/
TIMING CONTROL
STATE COUNTERS
SLAVE
ADDRESS
COMPARATORS
3.15
3.00
2.70
Only for
CAT1161
WATCHDOG
SCL
Precision
Vcc Monitor
RESET
RESET
© 2002 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
Doc No. 3002, Rev. D
Main Menu
CAT1161/2
ABSOLUTE MAXIMUM RATINGS
Temperature Under Bias ................. –55°C to +125°C
Storage Temperature ....................... –65°C to +150°C
Voltage on any Pin with
Respect to Ground
(1)
............ –2.0V to +V
CC
+2.0V
V
CC
with Respect to Ground ............... –2.0V to +7.0V
Package Power Dissipation
Capability (T
A
= 25°C) ................................... 1.0W
Lead Soldering Temperature (10 secs) ............ 300°C
Output Short Circuit Current
(2)
........................ 100 mA
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 specifica-
tion is not implied. Exposure to any absolute maximum
rating for extended periods may affect device perfor-
mance and reliability.
PIN FUNCTIONS
Pin No. Pin Name
1
2
3
4
5
6
7
8
DC
RESET
WP
GND
SDA
SCL
RESET
V
CC
Function
Do Not Connect
Active Low Reset I/O
Write Protect
Ground
Serial Data/Address
Clock Input
Active High Reset I/O
Power Supply
RELIABILITY CHARACTERISTICS
Symbol
N
END(3)
T
DR(3)
V
ZAP(3)
I
LTH(3)(4)
Parameter
Endurance
Data Retention
ESD Susceptibility
Latch-Up
Reference Test Method
Min
Max
Units
Cycles/Byte
Years
Volts
mA
MIL-STD-883, Test Method 1033 1,000,000
MIL-STD-883, Test Method 1008
MIL-STD-883, Test Method 3015
JEDEC Standard 17
100
2000
100
D.C. OPERATING CHARACTERISTICS
V
CC
= +2.7V to +6.0V, unless otherwise specified.
Symbol
I
CC
I
SB
I
LI
I
LO
V
IL
V
IH
V
OL1
Parameter
Power Supply Current
Standby Current
Input Leakage Current
Output Leakage Current
Input Low Voltage
Input High Voltage
Output Low Voltage (SDA) I
OL
= 3 mA, V
CC
= 3.0V
Test Conditions
f
SCL
= 100 KHz
V
CC
= 3.3V
V
CC
= 5
V
IN
= G
ND
or V
CC
V
IN
= G
ND
or V
CC
-1
V
CC
X 0.7
Min
Typ
Max
3
40
50
2
10
V
CC
x 0.3
V
CC
+ 0.5
0.4
Units
mA
µA
µA
µA
µA
V
V
V
Note:
(1) 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.
(2) Output shorted for no more than one second. No more than one output shorted at a time.
(3) This parameter is tested initially and after a design or process change that affects the parameter.
(4) Latch-up protection is provided for stresses up to 100 mA on address and data pins from –1V to V
CC
+1V.
Doc. No. 3002, Rev. D
2
Main Menu
CAT1161/2
CAPACITANCE
T
A
= 25˚C, f = 1.0 MHz, V
CC
= 5V
Symbol
C
I/O(1)
C
IN(1)
Test
Input/Output Capacitance (SDA)
Input Capacitance (SCL)
Conditions
V
I/O
= 0V
V
IN
= 0V
Max
8
6
Units
pF
pF
A.C. CHARACTERISTICS
V
CC
=2.7V to 6.0V unless otherwise specified.
Output Load is 1 TTL Gate and 100pF.
V
CC
= 2.7V - 6V
SYMBOL
F
SCL
T
I(1)
t
AA
t
BUF(1)
t
HD:STA
t
LOW
t
HIGH
t
SU:STA
t
HD:DAT
t
SU:DAT
t
R(1)
t
F(1)
t
SU:STO
t
DH
PARAMETER
Clock Frequency
Noise Suppresion Time
Constant at SCL, SDA Inputs
SLC Low to SDA Data Out
and ACK Out
Time the Bus Must be Free Before
a New Transmission Can Start
Start Condition Hold Time
Clock Low Period
Clock High Period
Start Condition Setup Time
(for a Repeated Start Condition)
Data in Hold Time
Data in Setup Time
SDA and SCL Rise Time
SDA and SCL Fall Time
Stop Condition Setup Time
Data Out Hold Time
4
100
0
50
1
300
4
4.7
4
4.7
4.7
3.5
Min
Max
100
200
V
CC
= 4.5V - 5.5V
Min
Max
400
200
1
1.2
0.6
1.2
0.6
0.6
0
50
0.3
300
0.6
100
Units
kHz
ns
µs
µs
µs
µs
µs
µs
ns
ns
µs
ns
µs
ns
POWER-UP TIMING
(1)(2)
Symbol
t
PUR
t
PUW
Parameter
Power-up to Read Operation
Power-up to Write Operation
Max
1
1
Units
ms
ms
WRITE CYCLE LIMITS
Symbol
t
WR
Parameter
Write Cycle Time
Min
Typ
Max
10
Units
ms
The write cycle time is the time from a valid stop condition of a write sequence to the end of the internal program/erase cycle. During the
write cycle, the bus interface circuits are disabled, SDA is allowed to remain high, and the device does not respond to its slave address.
NOTE:
(1) This parameter is tested initially and after a design or process change that affects the parameter.
(2) t
PUR
and t
PUW
are the delays required from the time V
CC
is stable until the specific operation can be initiated.
3
Doc No. 3002, Rev. D
Main Menu
CAT1161/2
RESET CIRCUIT CHARACTERISTICS
Symbol
t
GLITCH
V
RT
V
OLRS
V
OHRS
Parameter
Glitch Reject Pulse Width
Reset Threshold Hystersis
Reset Output Low Voltage (I
OLRS
=1mA)
Reset Output High Voltage
Reset Threshold (V
CC
=5V)
(CAT1161/2-45)
Reset Threshold (V
CC
=5V)
(CAT1161/2-42)
V
TH
Reset Threshold (V
CC
=3.3V)
(CAT1161/2-30)
Reset Threshold (V
CC
=3.3V)
(CAT1161/2-28)
Reset Threshold (V
CC
=3V)
(CAT1161/2-25)
t
PURST
twp
t
RPD
V
RVALID
Power-Up Reset Timeout
Watchdog Period
V
TH
to RESET Output Delay
RESET Output Valid
1
4.25
3.00
2.85
2.55
130
1.6
5
4.50
3.15
3.00
2.70
270
ms
sec
µs
V
V
CC
-0.75
4.50
4.75
15
0.4
Min
Typ
Max
100
Units
ns
mV
V
V
V
Doc. No. 3002, Rev. D
4
