CAT823 D

CAT823, CAT824, CAT825
System Supervisory Voltage
Reset with Watchdog and
Manual Reset
Description
The CAT823, CAT824, and CAT825 provide basic 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, after a minimum
timer of 140 ms; to allow the systems power supply to stabilize.
The CAT823 and CAT824 also 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 CAT823 and CAT825 also provide a manual reset input which
can be used to initiate reset if pulled low. This input can be directly
attached to a push−button or a processor signal.
Features
•
•
•
•
•
•
•
•
SC−70
SD SUFFIX
CASE 419AC
Automatically Restarts Microprocessor after Power Failure
Monitors Pushbutton for External Override
Accurate Under Voltage System Monitoring
Brownout Detection System Reset for use with 3.0, 3.3, and 5.0 Volt
Systems
Pin and Function Compatible with the MAX823/24/25 Products
Operating Range from −40°C to +85°C
Available in TSOT−23 5−lead and SC−70 Packages
These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
RESET
RESET
MR
RESET
1
VCC
CAT824
WDI
RESET
1
VCC
CAT825
MR
(Top Views)
MARKING DIAGRAM
XXXMG
G
CMOS Push−Pull Active Low Reset Output
Ground
Manual Reset input – Pulled high Internally by a 52 kW resistor designed to be driven low by a mechanical pushbutton,
open drain output or CMOS output.
CMOS Push−Pull Active High Reset Output
WDI
Watchdog Timer Input – Designed to be driven by a processor
output or can be disabled by tri−stating or leaving open.
VCC
Power Supply
May, 2012 − Rev. 8
WDI
RESET
Function
© Semiconductor Components Industries, LLC, 2012
CAT823
GND
PIN FUNCTIONS
GND
VCC
RESET
Microprocessor and Microcontroller Based Systems
Intelligent Instruments
Control Systems
Critical mP Monitors
Portable Equipment
RESET
1
MR
GND
Pin Name
TSOT−23
TD SUFFIX
CASE 419AE
PIN CONNECTIONS
GND
Applications
•
•
•
•
•
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1
XXX
M
G
= Specific Device Code
= Date Code
= Pb−Free Package*
(*Note: Microdot may be in either location)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 11 of this data sheet.
Publication Order Number:
CAT823/D
CAT823, CAT824, CAT825
WDI*
RESET
VCC
TOLERANCE
BIAS
VCC
VCC
VCC
TIMEOUT
COMPARATOR
LEVEL SENSE
&
TIMER
DIGITAL
DELAY
+
VCC
–
VOLTAGE
REFERENCE
RESET*
52 kW
LEVEL SENSE
&
DEBOUNCE
MR*
* Functions Available by Device
Figure 1. Block Diagram
Device
RESET
RESET
CAT823
x
CAT824
x
x
CAT825
x
x
MR
WDI
x
x
x
x
Table 1. ABSOLUTE MAXIMUM RATINGS
Parameters
Supply Voltage
Ratings
Units
6
V
−0.3 to (VCC + 0.3)
V
Input Current, VCC
20
mA
Output Current RESET, RESET
20
mA
Continuous Power Dissipations (TA = +70°C)
SC−70 5−lead (derate 3.1 mW/°C above +70°C)
TSOT−23 5−lead (derate 7.1 mW/°C above +70°C)
247
571
All other pins
mW
Storage Temperature
−65 to 150
°C
Operating Ambient Temperature
−40 to +85
°C
Lead Soldering (10 seconds max)
+300
°C
ESD Rating: Low Voltage Pins
Human Body Model
Machine Model
2000
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 2. RECOMMENDED OPERATING CONDITIONS
Parameter
VCC (TA = 0°C to +70°C)
VCC (TA = −40°C to +85°C)
All Other Pins
Ambient Temperature
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2
Range
Units
1.0 to 5.5
V
1.2 to 5.5
V
−0.1 to (VCC + 0.1)
V
−40 to +85
°C
CAT823, CAT824, CAT825
Table 3. ELECTRICAL OPERATING CHARACTERISTICS (DC Characteristics: VCC = 3.0 V to 5.5 V for L/M versions;
VCC = 2.0 V to 3.6 V for the R/S/T/U/Y/Z version, −40°C ≤ TA ≤ +85°C unless otherwise noted. Typical Values at TA = 25°C and VCC = 5 V
for L/M versions; VCC = 3.3 V for the T/S versions; VCC = 3.0 V for the R version; and VCC = 2.5 V for the U/Y/Z versions.) (Note 1)
Symbol
Parameter
ICC
Supply Current
VRST
Reset Threshold
Conditions
Min
Typ
Max
Units
CAT823 (L/M Versions)
CAT824 (L/M Versions)
6
17
mA
CAT823 (R/S/T/Y/Z Versions)
CAT824 (R/S/T/U/Y/Z Versions)
4
12
CAT825 (L/M Versions)
3
8
CAT825 (R/S/T/Y/Z Versions)
2
6
CAT82_L at −40°C ≤ TA ≤ +85°C
4.50
4.63
4.75
CAT82_M at −40°C ≤ TA ≤ +85°C
4.25
4.38
4.50
CAT82_T at −40°C ≤ TA ≤ +85°C
3.00
3.08
3.15
CAT82_S at −40°C ≤ TA ≤ +85°C
2.85
2.93
3.00
CAT82_R at −40°C ≤ TA ≤ +85°C
2.55
2.63
2.70
CAT82_Z at −40°C ≤ TA ≤ +85°C
2.25
2.32
2.38
CAT82_Y at −40°C ≤ TA ≤ +85°C
2.13
2.19
2.25
CAT824U at −40°C ≤ TA ≤ +85°C
1.95
2.00
2.05
Reset Threshold Tempco
Reset Threshold Hysteresis
tRD
VCC to Reset Delay (Note 2)
tRP
Reset Active Timeout Period
VOH
RESET Output High Voltage
40
ppm/°C
CAT82_L/M
10
mV
CAT82_R/S/T/Y/Z, CAT824U
5
VCC = VTH to (VTH − 100 mV)
20
140
CAT82_L/M, VCC = VRST max,
ISOURCE = −120 mA
CAT82_T/S/R/Z/Y, CAT824U,
VCC = VRST max, ISOURCE = −30 mA
VOL
ISOURCE
VOH
VOL
1.
2.
3.
4.
RESET Output Low Voltage
RESET Output
Short−Circuit Current
Reset Output Voltage
V
200
ms
400
V
VCC − 1.5 V
0.8 x VCC
CAT82_L/M, VCC = VRST min,
ISINK = 3.2 mA
0.4
CAT82_T/S/R/Z/Y, CAT824U,
VCC = VRST min, ISINK = 1.2 mA
0.3
TA = 0°C to +70°C, VCC = 1 V,
VCC falling, ISINK = 50 mA
0.3
TA = TMIN to TMAX, VCC = 1.2 V,
VCC falling, ISINK = 100 mA
0.3
CAT82_L/M, Reset = 0 V, VCC = 5.5 V
1.5
CAT82_L/M, Reset = 0 V, VCC = 3.6 V
0.8
VCC > 1.8 V, ISOURCE = −150 mA
ms
V
mA
V
0.8 x VCC
CAT824L/M & CAT825L/M,
VCC = VRST max, ISINK = 3.2 mA
0.4
CAT824R/S/T/U/Y/Z &
CAT825R/S/T/Y/Z,
VCC = VRST max, ISINK = 1.2 mA
0.3
Over−temperature 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.
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 10 mA and a maximum capacitance
of less than 200 pF. To clock the WDI input in the active mode the drive device must be able to source or sink at least 200 mA when active.
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CAT823, CAT824, CAT825
Table 3. ELECTRICAL OPERATING CHARACTERISTICS (DC Characteristics: VCC = 3.0 V to 5.5 V for L/M versions;
VCC = 2.0 V to 3.6 V for the R/S/T/U/Y/Z version, −40°C ≤ TA ≤ +85°C unless otherwise noted. Typical Values at TA = 25°C and VCC = 5 V
for L/M versions; VCC = 3.3 V for the T/S versions; VCC = 3.0 V for the R version; and VCC = 2.5 V for the U/Y/Z versions.) (Note 1)
Symbol
Parameter
Conditions
Min
Typ
Max
1.12
1.60
3.20
Units
WATCHDOG INPUT (CAT823 & CAT824)
tWD
Watchdog Timeout Period
tWDI
WDI Pulse Width
VIL
WDI Input Voltage (Note 3)
VIL = 0.4 V, VIH = 0.8 x VCC
s
50
VIH
ns
0.3 x VCC
V
160
mA
0.3 x VCC
V
0.7 x VCC
WDI Input Current (Note 4)
120
WDI = VCC, Time Average
WDI = 0 V, Time Average
−20
−15
MANUAL RESET INPUT (CAT823 & CAT825)
MR Input Voltage
VIL
VIH
0.7 x VCC
tPB
MR Pulse Width
tPDLY
MR low to Reset Delay
1
5
MR Noise Immunity
Pulse Width with No Reset
ms
100
MR Pullup Resistance
(internal)
1.
2.
3.
4.
ms
35
52
ns
75
kW
Over−temperature 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.
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 10 mA and a maximum capacitance
of less than 200 pF. To clock the WDI input in the active mode the drive device must be able to source or sink at least 200 mA when active.
TYPICAL ELECTRICAL OPERATING 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
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CAT823, CAT824, CAT825
FUNCTIONAL DESCRIPTION
Processor RESET
Manual RESET
The CAT823−825 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 (and RESET if available) 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
(and RESET) are pulled active. RESET (and RESET if
available) 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 CAT823 and CAT825 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 52 kW resistor and must be pulled low to cause
the reset outputs to go active. Internally, this input is
debounced and timed such that RESET (and 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)
RESET
MR
Supply
Voltage
CAT825
VCC
GND
RESET
Figure 4. Pushbutton RESET
tPB
MR
tPDLY
VIH
VIL
tRP
RESET
VOH
VOL
RESET
Figure 5. Timing Diagram – Pushbutton RESET
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CAT823, CAT824, CAT825
Watchdog Timer
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 7). 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.
The CAT823 and CAT824 provide a Watchdog input
(WDI). The watchdog timer function forces RESET (and
RESET in the CAT824) signals active when the WDI input
does not have a transition from low−to−high or high−to−low
within 1.12 seconds. Timeout of the watchdog starts when
RESET (RESET on the CAT824) becomes inactive. If a
transition occurs on the WDI input pin prior to the watchdog
time−out, the watchdog timer is reset and begins to time−out
again. If the watchdog timer is allowed to time−out, then the
reset output(s) will go active for tRP and once released will
repeat the watchdog timeout process.
Figure 6 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
WDI
MR
Supply
Voltage
PIC
μC
GND
CAT823
VCC
RESET
DECODER
ADDRESS
MCLR
Figure 6. Watchdog Timer
VCC
Tristate
VCC
RESET
GND
mC
150 kW
CAT823
OUTPUT
MR
WDI
110 kW
Figure 7. Watchdog Disable Circuit
INVALID
STROBE
VALID
STROBE
INDETERMINATE
STROBE
WDI
tWD
MIN.
RESET
Figure 8. Timing Diagram – Strobe Input
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MAX.
CAT823, CAT824, CAT825
VCC
VRST (MAX)
VRST
VRST (MIN)
tRD
RESET
VOH
RESET Slews with VCC
VOL
RESET (CAT824 & CAT825)
Figure 9. Timing Diagram – Power Down
VRST (MAX)
VRST
VRST (MIN)
VCC
tRP
RESET
VOH
RESET
VOL
RESET (CAT824 & CAT825)
Figure 10. Timing Diagram – Power Up
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CAT823, CAT824, CAT825
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 0 V.
Application Notes
mP’s with Bidirectional Reset Pins
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 CAT82_L/M is 1.5 mA (and by the CAT82_T/R/S/Z/Y
is 800 mA) allowing the processor to pull the output low even
when the CAT82x is pulling it high.
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.
These issues can usually be remedied by the proper location
of bypass capacitance on the circuit board.
MR
WDI
CAT823
VCC
100 kW
GND
RESET
mC
RESET
Figure 11. RESET Valid to 0 Volts VCC
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CAT823, CAT824, CAT825
PACKAGE DIMENSIONS
SC−70, 5 Lead, 1.25x2
CASE 419AC−01
ISSUE O
SYMBOL
D
e
e
E1 E
MIN
MAX
A
0.80
1.10
A1
0.00
0.10
A2
0.80
1.00
b
0.15
0.30
c
0.10
0.18
D
1.80
2.00
2.20
E
1.80
2.10
2.40
E1
1.15
1.25
1.35
0.65 BSC
e
0.26
L
TOP VIEW
NOM
0.36
L1
0.42 REF
L2
0.15 BSC
0.46
θ
0º
8º
θ1
4º
10º
q1
A2 A
q
q1
b
L
L1
A1
SIDE VIEW
c
END VIEW
Notes:
(1) All dimensions are in millimeters. Angles in degrees.
(2) Complies with JEDEC MO-203.
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L2
CAT823, CAT824, CAT825
PACKAGE DIMENSIONS
TSOT−23, 5 LEAD
CASE 419AE−01
ISSUE O
SYMBOL
D
MIN
NOM
A
e
E1
MAX
1.00
A1
0.01
0.05
0.10
A2
0.80
0.87
0.90
b
0.30
c
0.12
E
0.45
0.15
D
2.90 BSC
E
2.80 BSC
E1
1.60 BSC
e
0.95 TYP
L
0.30
L1
0.40
0.20
0.50
0.60 REF
L2
0.25 BSC
0º
θ
8º
TOP VIEW
A2 A
b
q
L
A1
c
L1
SIDE VIEW
END VIEW
Notes:
(1) All dimensions are in millimeters. Angles in degrees.
(2) Complies with JEDEC MO-193.
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L2
CAT823, CAT824, CAT825
ORDERING INFORMATION
Order Number
NiPdAu
Top Mark
Inputs
Outputs
Voltage
NiPdAu
MR
WDI
RESET
CAT823LTDI−GT3
4.63 V
ETA
*
*
*
CAT823MTDI−GT3
4.38 V
ETA
*
*
*
CAT823TTDI−GT3
3.08 V
ETA
*
*
*
CAT823STDI−GT3
2.93 V
ETA
*
*
*
CAT823RTDI−GT3
2.63 V
ETA
*
*
*
CAT823ZTDI−GT3
2.32 V
ETA
*
*
*
CAT823YTDI−GT3
2.19 V
ETA
*
*
*
CAT823LSDI−GT3
4.63 V
ETA
*
*
*
CAT823MSDI−GT3
4.38 V
ETA
*
*
*
CAT823TSDI−GT3
3.08 V
ETA
*
*
*
CAT823SSDI−GT3
2.93 V
ETA
*
*
*
CAT823RSDI−GT3
2.63 V
ETA
*
*
*
CAT823ZSDI−GT3
2.32 V
ETA
*
*
*
CAT823YSDI−GT3
2.19 V
ETA
*
*
*
CAT824LTDI−GT3
4.63 V
EFA
*
*
*
CAT824MTDI−GT3
4.38 V
EFA
*
*
*
CAT824TTDI−GT3
3.08 V
EFA
*
*
*
CAT824STDI−GT3
2.93 V
EFA
*
*
*
CAT824RTDI−GT3
2.63 V
EFA
*
*
*
CAT824ZTDI−GT3
2.32 V
EFA
*
*
*
CAT824YTDI−GT3
2.19 V
EFA
*
*
*
CAT824UTDI−GT3
2.00 V
EFA
*
*
*
CAT824LSDI−GT3
4.63 V
EFA
*
*
*
CAT824MSDI−GT3
4.38 V
EFA
*
*
*
CAT824TSDI−GT3
3.08 V
EFA
*
*
*
CAT824SSDI−GT3
2.93 V
EFA
*
*
*
CAT824RSDI−GT3
2.63 V
EFA
*
*
*
CAT824ZSDI−GT3
2.32 V
EFA
*
*
*
CAT824YSDI−GT3
2.19 V
EFA
*
*
*
5.
6.
7.
8.
RESET
Package
Quantity
per Reel
TSOT−23−5
3,000
SC−70−5
TOST−23−5
3,000
SC−70−5
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.
9. For detailed information and a breakdown of device nomenclature and numbering systems, please see the ON Semiconductor Device
Nomenclature document, TND310/D, available at www.onsemi.com
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11
CAT823, CAT824, CAT825
ORDERING INFORMATION
Order Number
NiPdAu
Top Mark
Inputs
Voltage
NiPdAu
MR
CAT825LTDI−GT3
4.63 V
ECA
CAT825MTDI−GT3
4.38 V
CAT825TTDI−GT3
WDI
Outputs
RESET
RESET
*
*
*
ECA
*
*
*
3.08 V
ECA
*
*
*
CAT825STDI−GT3
2.93 V
ECA
*
*
*
CAT825RTDI−GT3
2.63 V
ECA
*
*
*
CAT825ZTDI−GT3
2.32 V
ECA
*
*
*
CAT825YTDI−GT3
2.19 V
ECA
*
*
*
CAT825LSDI−GT3
4.63 V
ECA
*
*
*
CAT825MSDI−GT3
4.38 V
ECA
*
*
*
CAT825TSDI−GT3
3.08 V
ECA
*
*
*
CAT825SSDI−GT3
2.93 V
ECA
*
*
*
CAT825RSDI−GT3
2.63 V
ECA
*
*
*
CAT825ZSDI−GT3
2.32 V
ECA
*
*
*
CAT825YSDI−GT3
2.19 V
ECA
*
*
*
Package
Quantity
per Reel
TSOT−23−5
3,000
SC−70−5
5.
6.
7.
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.
9. For detailed information and a breakdown of device nomenclature and numbering systems, please see the ON Semiconductor Device
Nomenclature document, TND310/D, available at www.onsemi.com
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
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