CAT706 D

CAT705, CAT706, CAT813
mP Supervisory Circuits
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 MR input which 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.
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SOIC−8
V SUFFIX
CASE 751BD
PIN CONFIGURATIONS AND
MARKING DIAGRAMS
Features
•
•
•
Reset Guaranteed Valid for 1.0 V VCC
6 mA Supply Current
200 ms Reset Pulse Width
Watchdog Timer Function 1.6 s 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
SOIC 8−lead and MSOP 8−lead Packages
These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
SOIC−8 (V) (Top View)
1
WDO
MR
VCC
GND
PFI
L4A
CAT705VI
YMALND
•
•
•
•
•
•
•
MSOP−8
Z SUFFIX
CASE 846AD
RESET *
WDI
PFO
L
= Assembly Location Code
4
= Lead Finish NiPdAu
A
= Product Revision: Fixed as “A”
CATxxxV = Specific Device Code
= (CAT705V = CAT705 SOIC)
= (CAT706V = CAT706 SOIC)
= (CAT813V = CAT813 SOIC)
I
= Temperature Range (I = Industrial)
Y
= Production Year (Last Digit)
M
= Production Month (1−9, O, N, D)
ALND = Last Four Assembly Lot Number Digits
Typical Applications
MSOP−8 (Z) (Top View)
1
RESET *
WDO
MR
VCC
ABRx
Y
M
Z
ABRx
YMZ
• Microprocessor and Microcontroller Based Systems
• Instrument and Control Systems
• Portable Equipment
WDI
PFO
PFI
GND
= Specific Device Code
= (ABRT = CAT705 MSOP)
= (ABRT = CAT706 MSOP)
= (ABRS = CAT813 MSOP)
= Production Year (Last Digit)
= Production Month (1−9, O, N, D)
= Product Revision
(* RESET for CAT813)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 12 of this data sheet.
© Semiconductor Components Industries, LLC, 2012
April, 2012 − Rev. 7
1
Publication Order Number:
CAT705/D
CAT705, CAT706, CAT813
VCC
RMR = 60 kW
MR
VCC
RESET
CONTROLLER
+
RESET
(RESET for CAT813)
−
VRST
WDI
PFI
TIMER
52kW
WATCHDOG
TRANSITION
DETECTION
WATCHDOG
TIMER
WDO
+
PFO
−
1.25 V
Figure 1. Functional Block Diagram
Device
RESET
CAT705
CAT706
CAT813
RESET
MR
WDI
WDO
PFI
@ 4.65 V
x
x
x
@ 1.25 V
x
x
x
x
@ 1.25 V
x
x
x
@ 1.25 V
@ 4.65 V
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CAT705, CAT706, CAT813
Table 1. PIN FUNCTION DESCRIPTION
Pin Name
Function
MR
Manual Reset Input
VCC
Power Supply
GND
Ground
PFI
Power Fail voltage monitor Input
PFO
Power Fail Output
WDI
Watchdog Timer Input
RESET
CMOS Push−Pull Active Low Reset Output (CAT705 & CAT706)
RESET
CMOS Push−Pull Active High Reset Output (CAT813)
WDO
Watchdog Timer Output
Table 2. ABSOLUTE MAXIMUM RATINGS
Parameters
Ratings
Units
6.5
V
−0.3 to (VCC + 0.3)
V
Output Current RESET, RESET, WDO
20
mA
Continuous Power Dissipations (TA = +70°C)
SOIC 8−lead (derate 5.9 mW/°C above +70°C)
MSOP 8−lead (derate 4.1 mW/°C above +70°C)
471
330
Supply Voltage
All other pins
Storage Temperature
mW
−65 to 150
°C
Lead Soldering (10 seconds max)
+300
°C
ESD Rating: Human Body Model
2000
V
ESD Rating: Machine Model
200
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.
Table 3. RECOMMENDED OPERATING CONDITIONS
Parameter
VCC (TA = −40°C to +85°C)
All Other Pins
Ambient Temperature
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3
Rating
Unit
1.0 to 5.5
V
−0.1 to (VCC + 0.1)
V
−40 to +85
°C
CAT705, CAT706, CAT813
Table 4. ELECTRICAL OPERATING CHARACTERISTICS (Typical values at TA = 25°C and VCC = 5 V for CAT705, CAT706 and
CAT813 versions. VCC = 3.3 V for the CAT706 T/S versions; VCC = 3.0 V for the CAT706 R version.) (Note 1)
Parameter
Supply Current
Reset Threshold
Symbol
ICC
VRST
Typ
Max
Units
CAT705, CAT706, CAT813
Test Conditions
Min
6
17
mA
CAT706 (R/S/T Versions)
4
12
mA
CAT705 & CAT813 at
−40°C ≤ TA ≤ +85°C
4.50
4.65
4.75
V
CAT706 at −40°C ≤ TA ≤ +85°C
4.25
4.40
4.50
V
CAT706T at −40°C ≤ TA ≤ +85°C
3.00
3.08
3.15
V
CAT706S at −40°C ≤ TA ≤ +85°C
2.85
2.93
3.00
V
CAT706R at −40°C ≤ TA ≤ +85°C
2.55
2.63
2.70
V
Reset Threshold Tempco (Note 1)
Reset Threshold Hysteresis
(Note 1)
VCC to Reset Delay (Note 2)
tRD
Reset Active Timeout Period
tRP
RESET Output High Voltage
VOH
40
ppm/°C
CAT705 & CAT813
10
mV
CAT706
5
mV
VCC = VTH to (VTH – 100 mV)
20
ms
140
CAT705 & CAT706, 4.5 V < VCC <
5.5 V, ISOURCE = −800 mA
CAT705 & CAT706, VRST (max) <
VCC < 3.6 V, ISOURCE = −500 mA
RESET Output Low Voltage
RESET Output High Voltage
RESET Output Low Voltage
VOL
VOH
VOL
200
400
ms
V
VCC −
1.5 V
0.8 x VCC
CAT705 & CAT706, 4.5 V < VCC <
5.5 V, ISINK = 3.2 mA
0.4
CAT705 & CAT706, VRST (max) <
VCC < 3.6 V, ISINK = 1.2 mA
0.3
CAT705 &CAT706, VCC = 1 V,
ISINK = 100 mA
0.3
CAT813, VCC = VRST max,
ISOURCE = −120 mA
VCC −
1.5 V
CAT813, VCC = VRST max,
ISOURCE = −30 mA
0.8 x VCC
V
V
CAT813, VCC = VRST min,
ISINK = 3.2 mA
0.4
CAT813, VCC = 1.2 V,
ISINK = 100 mA
0.3
V
WATCHDOG INPUT
Watchdog Timeout Period
tWD
WDI Pulse Width
tWP
WDI Input Voltage (Note 3)
1.00
VIL = 0.4 V, VIH = 0.8 x VCC
s
ns
0.3 x VCC
V
150
mA
0.7 x VCC
WDI = VCC, Time Average
WDI = 0 V, Time Average
1.
2.
3.
4.
5.
2.25
50
VIL
VIH
WDI Input Current (Note 3)
1.6
50
−150
−50
Limits are guaranteed by design and not production tested.
The RESET short−circuit current is the maximum pull−up current when reset is driven low by a bidirectional output.
WDI is internally serviced within the watchdog period if WDI is left open.
RESET for CAT705 & CAT706 & RESET for CAT813.
Not 100% tested but guaranteed by design.
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CAT705, CAT706, CAT813
Table 4. ELECTRICAL OPERATING CHARACTERISTICS (Typical values at TA = 25°C and VCC = 5 V for CAT705, CAT706 and
CAT813 versions. VCC = 3.3 V for the CAT706 T/S versions; VCC = 3.0 V for the CAT706 R version.) (Note 1)
Parameter
Symbol
Test Conditions
Min
VW_OH
VRST (max) < VCC < 3.6 V;
ISOURCE = −500 mA
0.8 x VCC
4.5 V < VCC < 5.5 V,
ISOURCE = −800 mA
VCC – 1.5
Typ
Max
Units
WATCHDOG INPUT
WDO Output Voltage
VW_OL
VCC – 0.25
VRST (max) < VCC < 3.6 V,
ISINK = +500 mA
0.3
4.5 V < VCC < 5.5 V,
ISINK = 1.2 mA
WDO to WDI setup time (Note 5)
V
tWDSU
0.1
0.4
250
ns
MANUAL RESET INPUT
MR Input Voltage
VIH
MR Pull−up Current
MR Pulse Width
0.3 x VCC
V
70
140
mA
60
80
kW
5
ms
VIL
0.7 x VCC
MR = 0 V
40
tPB
1
MR Pull−up Resistance
RMR
40
MR low to Reset Delay (Note 4)
tPDLY
ms
POWER−FAIL INPUT
PFI Input Threshold
VCC = 5 V
PFI Input Current
PFO Output Voltage
VP_OH
VRST(max) < VCC < 3.6 V,
ISOURCE = −500 mA
4.5 V < VCC < 5.5 V,
ISOURCE = −800 mA
VP_OL
1.
2.
3.
4.
5.
1.2
1.25
1.3
V
−25
0.01
25
nA
V
0.8 x VCC
VCC −
1.5
0.4
VRST (max) < VCC < 3.6 V,
ISINK = +1.2 mA
0.3
4.5 V < VCC < 5.5 V, ISINK = 3.2 mA
0.4
Limits are guaranteed by design and not production tested.
The RESET short−circuit current is the maximum pull−up current when reset is driven low by a bidirectional output.
WDI is internally serviced within the watchdog period if WDI is left open.
RESET for CAT705 & CAT706 & RESET for CAT813.
Not 100% tested but guaranteed by design.
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CAT705, CAT706, CAT813
TYPICAL PERFORMANCE CHARACTERISTICS
NORMALIZED RESET THRESHOLD (V)
9
SUPPLY CURRENT (mA)
8
7
6
5
4
3
2
1
−40
−20
0
20
40
60
80
100
120
1.06
1.04
1.02
1.00
0.98
0.96
0.94
−40
−20
0
20
40
60
80
100
TEMPERATURE (°C)
TEMPERATURE (°C)
Figure 2. VCC Supply Current vs. Temperature
Figure 3. Normalized Reset Threshold Voltage
vs. Temperature
FUNCTIONAL DESCRIPTION
Processor Reset
Manual Reset
The CAT705, CAT706 & CAT813 detect supply voltage
(VCC) conditions that are below the specified voltage trip
value (VRST) and provide a reset output to maintain correct
system operation. On power−up, RESET (or RESET for the
CAT813) are kept active for a minimum delay tRP of 140 ms
after the supply voltage (VCC) rises above VRST to allow the
power supply and processor to stabilize. When VCC drops
below the voltage trip value (VRST), the reset output signals
RESET (or RESET) are pulled active. RESET (or RESET)
is specifically designed to provide the reset input signals for
processors. This provides reliable and consistent operation
as power is turned on, off or during brownout conditions by
maintaining the processor operation in known conditions.
The CAT705, CAT706 & CAT813 each have a Manual
Reset (MR) input to allow for alternative control of the reset
outputs. The MR input is designed for direct connection to
a pushbutton (see Figure 4). The MR input is internally
pulled up by 60 kW resistor and must be pulled low to cause
the reset output to go active. Internally, this input is
debounced and timed such that RESET (or RESET) signals
of at least 140 ms minimum will be generated. The min
140 ms tRP delay commences as the Manual Reset input is
released from the low level. (see Figure 5).
MR
VCC
GND
PFI
WDO
CAT705
CAT706
CAT813
RESET/RESET
WDI
PFO
Figure 4. Pushbutton RESET
tPB
MR
tPDLY
VIH
VIL
tRP
RESET
VOH
VOL
RESET
Figure 5. Timing Diagram – Pushbutton RESET
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CAT705, CAT706, CAT813
WATCHDOG TIMER
The CAT705, CAT706, & CAT813 provide a Watchdog
input (WDI). The watchdog timer function controls the
watchdog output (WDO) signal and forces the WDO to be
low (active) when the WDI input does not have a transition
from low−to−high or high−to−low within 1.6 s typical. If a
transition occurs on the WDI input pin prior to the watchdog
time−out, the watchdog timer is restarted. The timing
diagram is shown in Figure 6. The watchdog timer starts as
soon as reset condition becomes inactive.
When the VCC supply drops below the reset threshold, the
WDO output becomes active and goes low independently of
the watchdog timing stage.
Figure 7 below shows a typical implementation of a
watchdog function. Any processor signal that repeats
dependant on the normal operation of the processor or
directed by the software operating on the processor can be
used to strobe the watchdog input. The most reliable is a
dedicated I/O output transitioned by a specific software
instruction.
The watchdog can be disabled by floating (or tri−stating)
the WDI input (see Figure 8). If the watchdog is disabled the
WDI pin will be pulled low for the first 7/8th’s of the
watchdog period (tWD) and pulled high for the last 1/8th of
the watchdog period. This pulling low of the WDI input and
then high is used to detect an open or tri−state condition and
will continue to repeat until the WDI input is driven high or
low.
For most efficient operation of devices with the watchdog
function the WDI input should be held low the majority of
the time and only strobed high as required to reset the
watchdog timer.
tWDSU
tWP
tWD
WDI
WDO
RESET
(RESET)
tWD
tWD
+5 V
0V
+5 V
0V
+5 V
0V
RESET EXTERNALLY
TRIGGERED BY MR
+5 V
tRS
0V
(() Are for CAT813 Only)
Figure 6. Watchdog Timing Diagram
MR
WDO
VCC
GND
PFI
PIC
mC
MCLR
ADDRESS
RESET/RESET
CAT705
CAT706
CAT813
WDI
PFO
Figure 7. Watchdog Timer Circuit
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DECODER
CAT705, CAT706, CAT813
VCC
MR
VCC
GND
Tristate
WDO
CAT705
CAT706
CAT813
RESET/RESET
WDI
OUTPUT
PFO
PFI
mC
150 kW
110 kW
Figure 8. Watchdog Disable Circuit
VCC
VRST(MAX)
VRST
VRST(MIN)
tRD
RESET (CAT705 & CAT706)
VOH
RESET Slews with VCC
VOL
RESET (CAT813)
Figure 9. Timing Diagram – Power Down
VRST(MAX)
VRST
VRST(MIN)
VCC
tRP
RESET (CAT705 & CAT706)
VOH
VOL
Figure 10. Timing Diagram – Power Up
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8
RESET (CAT813)
CAT705, CAT706, CAT813
APPLICATION NOTES
mP’s with Bidirectional Reset Pins
These issues can usually be remedied by the proper location
of bypass capacitance on the circuit board.
The RESET output can be pulled low by processors like
the 68HC11 allowing for a system reset issued by the
processor. The maximum pullup current that can be sourced
by the CAT705 & CAT706 1.5 mA (and by the CAT706
T/R/S is 800 mA) allowing the processor to pull the output
low even when the CAT70x is pulling it high.
Output Valid Conditions
The RESET output uses a push−pull output which can
maintain a valid output down to a VCC of 1.0 volts. To sink
current below 0.8 V a resistor can be connected from
RESET to Ground (see Figure 11.) This arrangement will
maintain a valid value on the RESET output during both
power up and down but will draw current when the RESET
output is in the high state. A resistor value of about 100 kW
should be adequate in most situations to maintain a low
condition valid output down to VCC equal to 1.0 V.
Power Transients
Generally short duration negative−going transients of less
than 2 ms on the power supply at VRST minimum will not
cause a reset condition. However the lower the voltage of the
transient the shorter the required time to cause a reset output.
mC
MR
VCC
GND
WDO
RESET/RESET
CAT705
CAT706
CAT813
RESET/RESET
WDI
100 kW
PFO
PFI
Figure 11. RESET Valid for VCC < 1.0 V
5V
Push Switch
WDO
MR
UNREGULATED DC
VCC
GND
CAT705
CAT706
CAT813
PFI
RESET/RESET
WDI
PFO
Figure 12. Typical Operating Circuit
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VCC
mC
NMI
RESET/RESET
I/O LINE
INTERRUPT
CAT705, CAT706, CAT813
PACKAGE DIMENSIONS
SOIC 8, 150 mils
CASE 751BD−01
ISSUE O
E1
E
SYMBOL
MIN
A
1.35
1.75
A1
0.10
0.25
b
0.33
0.51
MAX
c
0.19
0.25
D
4.80
5.00
E
5.80
6.20
E1
3.80
e
PIN # 1
IDENTIFICATION
NOM
4.00
1.27 BSC
h
0.25
0.50
L
0.40
1.27
θ
0º
8º
TOP VIEW
D
h
A1
θ
A
c
e
b
L
END VIEW
SIDE VIEW
Notes:
(1) All dimensions are in millimeters. Angles in degrees.
(2) Complies with JEDEC MS-012.
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CAT705, CAT706, CAT813
PACKAGE DIMENSIONS
MSOP 8, 3x3
CASE 846AD−01
ISSUE O
SYMBOL
MIN
NOM
MAX
A
E
1.10
A1
0.05
0.10
0.15
A2
0.75
0.85
0.95
b
0.22
0.38
c
0.13
0.23
D
2.90
3.00
3.10
E
4.80
4.90
5.00
E1
2.90
3.00
3.10
E1
e
L
0.65 BSC
0.40
0.60
0.80
L1
0.95 REF
L2
0.25 BSC
θ
0º
6º
TOP VIEW
D
A
A2
A1
DETAIL A
e
b
c
SIDE VIEW
END VIEW
q
L2
Notes:
(1) All dimensions are in millimeters. Angles in degrees.
(2) Complies with JEDEC MO-187.
L
L1
DETAIL A
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11
CAT705, CAT706, CAT813
Example of Ordering Information (Notes 6 − 8)
Order Number
CAT705VI−GT3
CAT705ZI−GT3
CAT706RVI−GT3
CAT706RZI−GT3
CAT706SVI−GT3
CAT706SZI−GT3
CAT706TVI−GT3
CAT706TZI−GT3
CAT706VI−GT3
CAT706ZI−GT3
CAT813VI−GT3
CAT813ZI−GT3
6.
7.
8.
9.
Voltage
4.65
2.63
2.93
3.08
4.40
4.65
Top Mark
Manual Reset
Reset Output
Yes
LOW
Yes
LOW
Yes
LOW
Yes
LOW
Yes
LOW
Yes
HIGH
CAT705V
ABRT
CAT706V
ABRT
CAT706V
ABRT
CAT706V
ABRT
CAT706V
ABRT
CAT813V
ABRS
Package
Quantity per
Reel (Note 9)
SOIC−8
MSOP−8
SOIC−8
MSOP−8
SOIC−8
MSOP−8
SOIC−8
3,000
MSOP−8
SOIC−8
MSOP−8
SOIC−8
MSOP−8
All packages are RoHS−compliant (Lead−free, Halogen−free).
The standard lead finish is NiPdAu.
Contact factory for package availability.
For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging
Specifications Brochure, BRD8011/D.
ON Semiconductor and
are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice
to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability
arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages.
“Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All
operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights
nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications
intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should
Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates,
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Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.
PUBLICATION ORDERING INFORMATION
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For additional information, please contact your local
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CAT705/D
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