CAT705, CAT706, CAT813
µP Supervisory Circuits
FEATURES
Reset guaranteed valid for 1.0 V V
CC
6µA supply current
200ms Reset pulse width
Watchdog timer function 1.6s timeout
Accurate brownout detection reset in 3.0, 3.6,
and 5.0 volt systems
Secondary low supply monitoring on PFI input
Pin and function compatible with the
MAX705/MAX706/MAX813L products
Operating Range from -40°C to +85°C
RoHS Compliant 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 devices have a watchdog input which can be
¯¯¯¯
used to monitor a system signal and causes WDO to
go low if the signal fails to change state prior to a
timeout condition.
The supervisory circuits provide a ¯¯¯ input which
MR
initiates a reset if pulled low. The CAT705 and
¯¯¯¯¯¯
CAT706 provide an active low RESET output. The
CAT813 provides an active high RESET output.
There is a secondary supply monitor (PFI) included for
power-fail warning.
APPLICATIONS
Microprocessor and microcontroller based
systems
Instrument and control systems
Portable equipment
For Ordering Information details, see page 13.
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
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
WDI
PFO
PFI
GND
¯¯¯¯¯¯
RESET
RESET
¯¯¯¯¯
WDO
WDO
MR
V
CC
© 2010 SCILLC. All rights reserved.
Characteristics subject to change without notice
1
Doc. No. MD-3030, Rev. E
CAT705, CAT706, CAT813
BLOCK DIAGRAM
V
CC
70µA
MR
V
CC
RESET
CONTROLLER
RESET
(RESET for CAT813)
V
RST
TIMER
WDI
52kΩ
WATCHDOG
TRANSITION
DETECTION
WATCHDOG
TIMER
WDO
PFI
PFO
1.25V
Device
CAT705
CAT706
CAT813
¯¯¯¯¯¯
RESET
@ 4.65 V
x
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. E
2
© 2010 SCILLC. All rights reserved.
Characteristics subject to change without notice
CAT705, CAT706, CAT813
ABSOLUTE MAXIMUM RATINGS
(1)
Parameters
Supply Voltage
All other pins
¯¯¯¯¯¯ ¯¯¯¯
Output Current RESET, RESET,WDO
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
1.0 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.
© 2010 SCILLC. All rights reserved.
Characteristics subject to change without notice
3
Doc. No. MD-3030, Rev. E
CAT705, CAT706, CAT813
ELECTRICAL OPERATING CHARACTERISTICS
Typical values at T
A
= 25ºC and V
CC
= 5V for CAT705, CAT706 and CAT813 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
V
RST
Reset Threshold
CAT706T at -40ºC
≤
T
A
≤
+85ºC
CAT706S at -40ºC
≤
T
A
≤
+85ºC
CAT706R at -40ºC
≤
T
A
≤
+85ºC
Reset Threshold
Tempco
(1)
Reset Threshold
Hysteresis
(1)
t
RD
t
RP
Reset Active
Timeout Period
CAT705 & CAT706, 4.5 V < V
CC
< 5.5 V,
¯¯¯¯¯¯
RESET Output High I
SOURCE
= -800 µA
Voltage
CAT705 & CAT706, V
RST (max)
< V
CC
< 3.6 V,
I
SOURCE
= -500 µA
CAT705 & CAT706, 4.5 V < V
CC
< 5.5 V,
I
SINK
= 3.2 mA
V
OL
¯¯¯¯¯¯
RESET Output Low
Voltage
CAT705 & CAT706, V
RST (max)
< V
CC
< 3.6 V,
I
SINK
= 1.2 mA
CAT705 &CAT706, V
CC
= 1 V
I
SINK
= 100 µA
V
OH
CAT813, V
CC
= V
RST max
,
RESET Output High I
SOURCE
= -120 µA
Voltage
CAT813, V
CC
= V
RST max
,
I
SOURCE
= -30 µA
RESET Output Low
Voltage
CAT813, V
CC
= V
RST min
,
I
SINK
= 3.2 mA
CAT813, V
CC
= 1.2 V
I
SINK
= 100 µA
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
V
0.8 x V
CC
0.4
0.3
0.3
V
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
CC
to Reset Delay
(2)
V
CC
= V
TH
to (V
TH
– 100 mV)
V
OH
V
OL
Notes:
(1) 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
© 2010 SCILLC. All rights reserved.
Characteristics subject to change without notice
Doc. No. MD-3030 Rev. E
CAT705, CAT706, CAT813
ELECTRICAL OPERATING CHARACTERISTICS (continued)
Typical values at T
A
= 25°C and V
CC
= 5V for CAT705, CAT706, and 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
WP
V
IL
V
IH
Parameter
Watchdog Timeout Period
WDI Pulse Width
WDI Input Voltage
(3)
WDI Input Current
(4)
WDI = V
CC
, Time Average
WDI = 0V, Time Average
V
RST (max)
< V
CC
< 3.6 V
I
SOURCE
= -500 µA
4.5 V < V
CC
< 5.5 V,
I
SOURCE
= -800 µA
V
RST (max)
< V
CC
< 3.6 V,
I
SINK
= +500 µA
4.5 V < V
CC
< 5.5 V,
I
SINK
= 1.2 mA
0.1
-150
0.8 x V
CC
V
CC
– 1.5
V
CC
– 0.25
V
0.3
0.4
V
IL
= 0.4 V, V
IH
= 0.8 x V
CC
Conditions
Min
1.00
50
0.3 x V
CC
0.7 x V
CC
50
-50
150
Typ
1.6
Max
2.25
Units
s
ns
V
µA
WATCHDOG INPUT
V
W_OH
WDO Output Voltage
V
W_OL
MANUAL RESET INPUT
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
V
RST (max)
< V
CC
< 3.6 V,
I
SOURCE
= -500 µA
¯¯¯¯ Output Voltage
PFO
V
P_OL
4.5 V < V
CC
< 5.5 V,
I
SOURCE
= -800 µA
V
RST (max)
< V
CC
< 3.6 V,
I
SINK
= +1.2 mA
4.5 V < V
CC
< 5.5 V,
I
SINK
= 3.2 mA
V
CC
= 5 V
1.2
-25
0.8 x V
CC
V
CC
- 1.5V
0.4
V
0.3
0.4
1.25
0.01
¯¯¯ = 0 V
MR
0.3 x V
CC
0.7 x V
CC
40
1
5
1.3
25
70
140
V
µA
µs
µs
V
nA
POWER-FAIL INPUT
V
P_OH
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.
© 2010 SCILLC. All rights reserved.
Characteristics subject to change without notice
5
Doc. No. MD-3030, Rev. E
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