CAT705, CAT706, CAT813
µP Supervisory Circuits
FEATURES
Accurate under voltage system monitoring
¯¯¯¯¯¯
RESET guaranteed valid for V
CC
= 1.0V
6µA supply current
200ms RESET pulse width
Watchdog timer function 1.6 sec timeout
Brownout detection system reset for use with
3.0, 3.6, and 5.0 volt systems
Pin and function compatible with the
MAX705/706/813L products
Operating Range from -40°C to +85°C
Available in SOIC 8-lead and MSOP 8-lead
packages
DESCRIPTION
The CAT705, CAT706, and CAT813 provide reset and
monitoring functions for the electronic systems. Each
device monitors the system voltage and maintains a
reset output until that voltage reaches the device’s
specified trip value and then maintains the reset
output active condition until the device’s internal timer
allows the system power supply to stabilize.
The CAT705, CAT706, and CAT813 have a watchdog
input which can be used to monitor a system signal
and cause a reset to be issued if the signal fails to
change state prior to a timeout condition.
¯¯¯¯¯¯
The CAT705 and CAT706 provide a manual RESET
input which initiate reset if pulled low. The CAT705,
CAT706 and CAT813 provide a RESET output which
is low for the CAT705 and CAT706, but high for the
CAT813.
There is a secondary supply monitor included for
power-fail warning (pin PFI).
The CAT706 has a threshold voltage 4.40V. The
CAT705/ CAT813 have a threshold voltage of 4.65V.
For Ordering Information details, see page 13.
APPLICATIONS
Microprocessor and microcontroller based
systems
Intelligent instruments
Control systems
Critical µP monitors
Portable equipment
PIN CONFIGURATION
SOIC 8-Lead
MR
V
CC
GND
PFI
1
2
3
4
8
7
6
5
WDO
RESET
(RESET for CAT813)
PIN FUNCTIONS
Pin Name
¯¯¯
MR
V
CC
GND
PFI
¯¯¯¯
PFO
WDI
WDI
PFO
PFI
Function
Manual Reset input
Power Supply
Ground
Power Fail voltage monitor Input.
Power Fail Output
Watchdog Timer Input
CMOS Push-Pull Active Low Reset
Output (CAT705 & CAT706)
CMOS Push-Pull Active High Reset
Output (CAT813)
Watchdog Timer Output
WDI
PFO
MSOP 8-Lead
RESET
(RESET for CAT813)
1
2
3
4
8
7
6
5
¯¯¯¯¯¯
RESET
RESET
¯¯¯¯¯
WDO
WDO
MR
V
CC
GND
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
1
Doc. No. MD-3030, Rev. A
CAT705, CAT706, CAT813
BLOCK DIAGRAM
V
CC
250µA
MR
V
CC
RESET
CONTROLLER
RESET
(RESET for CAT813)
4.65/4.40V
TIMER
WDI
52kΩ
WATCHDOG
TRANSITION
DETECTION
WATCHDOG
TIMER
WDO
PFI
PFO
1.25V
Device
CAT705
CAT706
CAT813
¯¯¯¯¯¯
RESET
@ 4.65 V
@ 4.40 V
RESET
¯¯¯
MR
x
x
WDI
x
x
x
¯¯¯¯¯
WDO
x
x
x
PFI
@ 1.25 V
@ 1.25 V
@ 1.25 V
@ 4.65 V
x
Doc. No. MD-3030, Rev. A
2
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT705, CAT706, CAT813
ABSOLUTE MAXIMUM RATINGS
(1)
Parameters
Supply Voltage
All other pins
Output Current RST, ¯¯¯¯,WDO
RST ¯¯¯¯
Continuous Power Dissipations (T
A
= +70ºC)
SOIC 8-lead (derate 5.9mW/ºC above +70ºC)
MSOP 8-lead (derate 4.1mW/ºC above +70ºC)
Storage Temperature
Lead Soldering (10 seconds max)
ESD Rating: Human Body Model
ESD Rating: Machine Model
RECOMMENDED OPERATING CONDITIONS
Parameter
V
CC
(T
A
= -40ºC to +85ºC)
All Other Pins
Ambient Temperature
Range
1.2 to 5.5
-0.1 to (V
CC
+ 0.1)
-40 to +85
Units
V
V
ºC
471
330
-65 to 150
+300
2000
200
ºC
ºC
V
V
mW
Ratings
6.5
-0.3 to (V
CC
+ 0.3)
20
Units
V
V
mA
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.
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
3
Doc. No. MD-3030, Rev. A
CAT705, CAT706, CAT813
ELECTRICAL OPERATING CHARACTERISTICS
V
CC
= 4.5V to 5.5V for CAT705, CAT706, CAT813 versions;
V
CC
= 3.0V to 3.6V for the CAT706 R/S/T versions,
-40ºC
≤
T
A
≤
+85ºC unless otherwise noted.
Typical values at T
A
= 25ºC and V
CC
= 5V for CAT705, CAT706 versions;
V
CC
= 3.3V for the CAT706 T/S versions; V
CC
= 3.0V for the CAT706 R version.
(1)
Symbol Parameter
I
CC
Supply Current
Conditions
CAT705
CAT706
CAT813
CAT706 (R/S/T Versions)
CAT705 & CAT813 at
-40ºC
≤
T
A
≤
+85ºC
CAT706 at -40ºC
≤
T
A
≤
+85ºC
CAT706T at -40ºC
≤
T
A
≤
+85ºC
CAT706S at -40ºC
≤
T
A
≤
+85ºC
CAT706R at -40ºC
≤
T
A
≤
+85ºC
Reset Threshold
Tempco
Reset Threshold
Hysteresis
t
RD
t
RP
Reset Active
Timeout Period
¯¯¯¯¯¯
RESET Output High
Voltage
CAT705 & CAT706, V
CC
= V
RST max
,
I
SOURCE
= -120µA
CAT705 & CAT706, V
CC
= V
RST max
,
I
SOURCE
= -30µA
CAT705 & CAT706, V
CC
= V
RST min
,
I
SINK
= 3.2mA
CAT705 &CAT706, V
CC
= 1.2V
I
SINK
= 100µA
CAT813, V
CC
= V
RST max
,
I
SOURCE
= -120µA
CAT813, V
CC
= V
RST max
,
I
SOURCE
= -30µA
CAT813, V
CC
= V
RST min
,
I
SINK
= 3.2mA
CAT813, V
CC
= 1.2V
I
SINK
= 100µA
V
CC
- 1.5V
V
0.8 x V
CC
0.4
V
0.3
CAT705 & CAT813
CAT706
Min
Typ
6
4
4.50
4.25
3.00
2.85
2.55
4.65
4.40
3.08
2.93
2.63
40
10
5
20
140
V
CC
- 1.5V
0.8 x V
CC
V
0.4
0.3
200
400
Max
17
12
4.75
4.50
3.15
3.00
2.70
Units
µA
µA
V
V
V
V
V
ppm/ºC
mV
mV
µs
ms
V
RST
Reset Threshold
V
CC
to Reset Delay
(2)
V
CC
= V
TH
to (V
TH
- 100mV)
V
OH
V
OL
¯¯¯¯¯¯
RESET Output Low
Voltage
V
OH
RESET Output High
Voltage
V
OL
RESET Output Low
Voltage
Notes:
(1) Over-temperature limits are guaranteed by design and not production tested.
(2)
The RESET short-circuit current is the maximum pull-up current when reset is driven low by a bidirectional output.
4
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
Doc. No. MD-3030 Rev. A
CAT705, CAT706, CAT813
ELECTRICAL OPERATING CHARACTERISTICS (continued)
V
CC
= 4.50V to 5.5V for CAT705, CAT706 & CAT813 versions;
V
CC
= 3.0V to 3.6V for the CAT706 R/S/T version,
-40°C
≤
T
A
≤
+85°C unless otherwise noted.
Typical values at T
A
= 25°C and V
CC
= 5V for CAT705, CAT706, & CAT813 versions;
V
CC
= 3.3V for the CAT706 T/S versions; V
CC
= 3.0V for the CAT706 R version.
Symbol
t
WD
t
WDI
V
IL
V
IH
Parameter
Watchdog Timeout Period
WDI Pulse Width
WDI Input Voltage
(3)
WDI Input Current
(4)
WDO Output Voltage
WDI = V
CC
, Time Average
WDI = 0V, Time Average
I
SOURCE
= -800µA
I
SINK
= 1.2mA
-150
V
CC
– 1.5
V
IL
= 0.4V, V
IH
= 0.8 x V
CC
Conditions
Min
1.00
50
0.3 x V
CC
0.7 x V
CC
50
-50
V
CC
– 0.25
0.1
0.4
0.3 x V
CC
0.7 x V
CC
¯¯¯ = 0V
MR
40
1
5
V
CC
= 5V
I
SOURCE
= -800µA
I
SINK
= 3.2mA
1.2
-25
V
CC
- 1.5V
0.4
1.25
0.01
1.3
25
70
140
150
Typ
1.60
Max
2.25
Units
s
ns
V
µA
V
WATCHDOG INPUT (CAT705, CAT706 & CAT813)
MANUAL RESET INPUT(CAT705, CAT706 & CAT813)
V
IL
V
IH
t
PB
t
PDLY
¯¯¯ Input Voltage
MR
¯¯¯ Pull-up Current
MR
¯¯¯ Pulse Width
MR
¯¯¯ low to Reset Delay
(5)
MR
PFI Input Threshold
PFI Input Current
¯¯¯¯ Output Voltage
PFO
V
µA
µs
µs
V
nA
V
V
Notes:
(3) WDI is internally serviced within the watchdog period if WDI is left open.
(4) The WDI input current is specified as an average input current when the WDI input is driven high or low. The WDI input if connected to a
three-stated output device can be disabled in the tristate mode as long as the leakage current is less than 10µA and a maximum
capacitance of less than 200pF. To clock the WDI input in the active mode the drive device must be able to source or sink at least 200µA
when active.
¯¯¯¯¯¯
(5) RESET for CAT705 & CAT706 & RESET for CAT813.
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
5
Doc. No. MD-3030, Rev. A
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