ADM8320WCY29ARJZR7 [ADI]
Supervisory Circuit with Watchdog, Manual Reset, and Active-Low Open-Drain Reset Output;
| 型号： | ADM8320WCY29ARJZR7 |
| 厂家： | 
ADI |
| 描述： | Supervisory Circuit with Watchdog, Manual Reset, and Active-Low Open-Drain Reset Output 光电二极管 |
| 文件： | 总15页 (文件大小：275K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Supervisory Circuits with Watchdog
and Manual Reset in 5-Lead SOT-23
ADM8316/ADM8318/ADM8319/ADM8320/ADM8321/ADM8322
Data Sheet
FEATURES
FUNCTIONAL BLOCK DIAGRAMS
27 reset threshold options
2.5 V to 5 V in 100 mV increments
4 reset timeout options
1 ms, 20 ms, 140 ms, and 1120 ms (minimum)
4 watchdog timeout options
ADM8316
V
CC
V
CC
RESET
GENERATOR
RESET
V
REF
6.3 ms, 102 ms, 1.6 sec, and 25.6 sec (typical)
Manual reset input
Multiple reset output options
DEBOUNCE
MR
WATCHDOG
DETECTOR
Low power consumption
Specified over wide temperature range (−40°C to +125°C)
Qualified for automotive applications
5-lead SOT-23 package
GND
WDI
Figure 1. ADM8316
APPLICATIONS
ADM8320
Automotive infotainment
Microprocessor systems
Computers
RESET
V
CC
RESET
GENERATOR
V
REF
Controllers
Intelligent instruments
Portable equipment
MR
DEBOUNCE
WATCHDOG
DETECTOR
GND
WDI
Figure 2. ADM8320
GENERAL DESCRIPTION
The ADM8316/ADM8318/ADM8319/ADM8320/ADM8321/
ADM8322 are supervisory circuits that monitor power supply
voltage levels and code execution integrity in microprocessor-based
systems. As well as providing power-on reset signals, an on-chip
watchdog timer can reset the microprocessor if it fails to strobe
within a preset timeout period. A reset signal can also be asserted
by an external push-button switch through a manual reset input.
The six devices feature different combinations of watchdog
input, manual reset input, and output stage configuration,
as shown in Table 6.
Each device is available in a choice of 27 reset threshold options
ranging from 2.5 V to 5 V in 100 mV increments. There are also
four reset timeout options of 1 ms, 20 ms, 140 ms, and 1120 ms
(minimum) and four watchdog timeout options of 6.3 ms, 102 ms,
1.6 sec, and 25.6 sec (typical). Not all device options are available
as standard models. See the Ordering Guide for details.
The ADM8316/ADM8318/ADM8319/ADM8320/ADM8321/
ADM8322 are available in 5-lead SOT-23 packages and typically
consume only 10 µA, making them suitable for use in low
power, portable applications.
Rev. C
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ADM8316/ADM8318/ADM8319/ADM8320/ADM8321/ADM8322
TABLE OF CONTENTS
Data Sheet
Features .............................................................................................. 1
Applications....................................................................................... 1
Functional Block Diagrams............................................................. 1
General Description......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 5
ESD Caution.................................................................................. 5
Pin Configurations and Function Descriptions ........................... 6
Typical Performance Characteristics ............................................. 7
Theory of Operation ...................................................................... 10
Circuit Description..................................................................... 10
Push-Pull Reset Output ............................................................. 10
RESET
Output ..................................................... 10
Open-Drain
Manual Reset Input .................................................................... 10
Watchdog Input .......................................................................... 10
Applications Information .............................................................. 11
Watchdog Input Current ........................................................... 11
Negative Going VCC Transients................................................. 11
Ensuring Reset Valid to VCC = 0 V........................................... 11
Watchdog Software Considerations......................................... 11
Device Model Options................................................................... 12
Outline Dimensions....................................................................... 14
Ordering Guide .......................................................................... 15
Automotive Products................................................................. 15
REVISION HISTORY
2/2018—Rev. B to Rev. C
Changes to General Description Section ...................................... 1
Added Note 3, Table 1...................................................................... 4
Changed Options Section to Device Model Options Section .. 12
Changes to Device Model Options Section ................................ 12
Deleted Table 10; Renumbered Sequentially .............................. 13
Changes to Ordering Guide .......................................................... 15
9/2016—Rev. A to Rev. B
Change to Features Section ............................................................. 1
Changes to Table 9 .......................................................................... 12
Changes to Table 10........................................................................ 13
Changes to Ordering Guide .......................................................... 14
9/2015—Rev. 0 to Rev. A
Changes to Table 10........................................................................ 13
10/2013—Revision 0: Initial Version
Rev. C | Page 2 of 15
Data Sheet
ADM8316/ADM8318/ADM8319/ADM8320/ADM8321/ADM8322
SPECIFICATIONS
VCC = (VTH + 1.5%) to 5.5 V, TA = −40°C to +125°C, unless otherwise noted. Typical values are at TA = 25°C.
Table 1.
Parameter
Min
Typ
Max
Unit
Test Conditions/Comments
SUPPLY
VCC Operating Voltage Range1
VCC that Guarantees Valid Output
Supply Current (WDI Floating)
0.9
0.9
5.5
V
V
µA
µA
10
10
VTH
20
18
VCC = 5.5 V
VCC = 3.6 V
RESET THRESHOLD VOLTAGE2, 3
VTH − 1%
VTH − 1.5% VTH
20
VTH + 1%
VTH + 1.5%
V
V
TA = 25°C
TA = −40°C to +125°C
RESET THRESHOLD TEMPERATURE COEFFICIENT
RESET THRESHOLD HYSTERESIS
RESET TIMEOUT PERIOD3
ppm/°C
mV
2.5 × VTH
See Table 7
Reset Timeout Option A
Reset Timeout Option B
Reset Timeout Option C
Reset Timeout Option D
1
20
140
1120
1.4
28
200
1600
90
1.8
36
260
2080
ms
ms
ms
ms
µs
VCC TO RESET DELAY, tRD
VCC falling at 1 mV/µs
PUSH-PULL OUTPUT (ADM8316, ADM8318, ADM8319,
ADM8321, ADM8322)
RESET Output Voltage
0.2
0.2
0.2
0.3
V
VCC ≥ 0.9 V, ISINK = 25 µA
VCC ≥ 1.2 V, ISINK = 100 µA
VCC ≥ 2.7 V, ISINK = 1.2 mA
VCC ≥ 4.5 V, ISINK = 3.2 mA
VCC ≥ 2.7 V, ISOURCE = 500 µA
VCC ≥ 4.5 V, ISOURCE = 800 µA
V
V
V
V
0.9 × VCC
0.9 × VCC
V
RESET Rise Time
50
100
ns
From 10% to 90% VCC, CL = 5 pF,
VCC = 3.3 V
RESET Output Voltage
0.2
0.3
V
V
V
V
VCC ≥ 2.7 V, ISINK = 1.2 mA
VCC ≥ 4.5 V, ISINK = 3.2 mA
VCC ≥ 2.7 V, ISOURCE = 500 µA
VCC ≥ 4.5 V, ISOURCE = 800 µA
0.9 × VCC
0.9 × VCC
OPEN-DRAIN OUTPUT (ADM8320, ADM8321, ADM8322)
RESET Output Voltage
0.2
0.2
0.2
0.3
1
V
VCC ≥ 0.9 V, ISINK = 25 µA
VCC ≥ 1.2 V, ISINK = 100 µA
VCC ≥ 2.7 V, ISINK = 1.2 mA
VCC ≥ 4.5 V, ISINK = 3.2 mA
V
V
V
µA
Open-Drain Reset Output Leakage Current
WATCHDOG INPUT (ADM8316, ADM8318, ADM8320,
ADM8321)
3
Watchdog Timeout Period, tWD
See Table 8
Watchdog Timeout Option W
Watchdog Timeout Option X
Watchdog Timeout Option Y
Watchdog Timeout Option Z
WDI Pulse Width
4.5
72
1.12
18.0
50
6.3
102
1.6
8.1
ms
ms
sec
sec
ns
132
2.24
33.2
25.6
VIL = 0.3 × VCC, VIH = 0.7 × VCC
WDI Input Threshold
WDI Input Current
0.3 × VCC
0.7 × VCC
100
V
µA
35
Rev. C | Page 3 of 15
ADM8316/ADM8318/ADM8319/ADM8320/ADM8321/ADM8322
Data Sheet
Parameter
Min
Typ
Max
Unit
Test Conditions/Comments
MANUAL RESET INPUT (ADM8316, ADM8319, ADM8320,
ADM8322)
VIL
0.8
V
VIH
2.0
1
V
MR Input Pulse Width
MR Glitch Rejection
MR Pull-Up Resistance
MR to Reset Delay
µs
ns
kΩ
ns
100
75
35
125
350
VCC = 5 V
1 The device switches from undervoltage reset to normal operation when 1.5 V < VCC < 2.5 V.
2 The device monitors VCC through an internal factory trimmed voltage divider that programs the nominal reset threshold. Factory-trimmed reset thresholds are
available in approximately 100 mV increments from 2.5 V to 5 V.
3 Not all device options are available as standard models. See the Ordering Guide for details.
Rev. C | Page 4 of 15
Data Sheet
ADM8316/ADM8318/ADM8319/ADM8320/ADM8321/ADM8322
ABSOLUTE MAXIMUM RATINGS
TA = 25°C, unless otherwise noted.
Stresses at or above those listed under Absolute Maximum
Ratings may cause permanent damage to the product. This is a
stress rating only; functional operation of the product at these
or any other conditions above those indicated in the operational
section of this specification is not implied. Operation beyond
the maximum operating conditions for extended periods may
affect product reliability.
Table 2.
Parameter
Rating
VCC
−0.3 V to +6 V
−0.3 V to (VCC + 0.3 V)
20 mA
All Other Pins
Output Current (RESET, RESET)
Operating Temperature Range
Storage Temperature Range
θJA Thermal Impedance, SOT-23
Lead Temperature
−40°C to +125°C
−65°C to +150°C
270°C/W
ESD CAUTION
Soldering (10 sec)
Vapor Phase (60 sec)
Infrared (15 sec)
300°C
215°C
220°C
Rev. C | Page 5 of 15
ADM8316/ADM8318/ADM8319/ADM8320/ADM8321/ADM8322
PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS
Data Sheet
1
2
3
RESET
GND
MR
5
V
CC
ADM8316/
ADM8320
TOP VIEW
(Not to Scale)
4
WDI
Figure 3. ADM8316/ADM8320 Pin Configuration
Table 3. ADM8316/ADM8320 Pin Function Descriptions
Pin No.
Mnemonic
Description
1
RESET
Active Low Reset Output. Asserted whenever VCC is below the reset threshold, VTH. This pin is a push-pull
output stage for the ADM8316 and an open-drain output stage for the ADM8320.
2
3
GND
MR
Ground.
Manual Reset Input. This is an active low input that, when forced low for greater than the glitch filter time,
generates a reset. It features a 75 kΩ internal pull-up resistor.
4
5
WDI
VCC
Watchdog Input. Generates a reset if the logic level on the pin remains low or high for the duration of the
watchdog timeout. The timer is cleared if a logic transition occurs on this pin or if a reset is generated. Leave
this pin floating to disable the watchdog timer.
Power Supply Voltage Being Monitored.
RESET
GND
1
2
3
5
4
V
CC
ADM8318/
ADM8321
TOP VIEW
(Not to Scale)
RESET
WDI
Figure 4. ADM8318/ADM8321 Pin Configuration
Table 4. ADM8318/ADM8321 Pin Function Descriptions
Pin No.
Mnemonic
Description
1
RESET
Active Low Reset Output. Asserted whenever VCC is below the reset threshold, VTH. This pin is a push-pull
output stage for the ADM8318 and an open-drain output stage for the ADM8321.
2
3
4
GND
RESET
WDI
Ground.
Active High Push-Pull Reset Output.
Watchdog Input. Generates a reset if the logic level on the pin remains low or high for the duration of the
watchdog timeout. The timer is cleared if a logic transition occurs on this pin or if a reset is generated. Leave
this pin floating to disable the watchdog timer.
5
VCC
Power Supply Voltage Being Monitored.
RESET
GND
1
2
3
5
4
V
CC
ADM8319/
ADM8322
TOP VIEW
(Not to Scale)
RESET
MR
Figure 5. ADM8319/ADM8322 Pin Configuration
Table 5. ADM8319/ADM8322 Pin Function Descriptions
Pin No.
Mnemonic
Description
1
RESET
Active low Reset Output. Asserted whenever VCC is below the reset threshold, VTH. This pin is a push-pull
output stage for the ADM8319 and an open-drain output stage for the ADM8322.
2
3
4
GND
RESET
MR
Ground.
Active High Push-Pull Reset Output.
Manual Reset Input. This is an active low input that, when forced low for greater than the glitch filter time,
generates a reset. It features a 75 kΩ internal pull-up resistor.
5
VCC
Power Supply Voltage Being Monitored.
Rev. C | Page 6 of 15
Data Sheet
ADM8316/ADM8318/ADM8319/ADM8320/ADM8321/ADM8322
TYPICAL PERFORMANCE CHARACTERISTICS
14
13
12
100
90
80
70
60
50
40
30
20
10
0
V
= 5.0V
11
10
9
CC
V
= 3.0V
CC
V
= 5V
TH
8
V
= 2.93V
= 2.5V
TH
TH
V
= 1.5V
CC
7
6
V
5
4
3
2
1
0
–40
–20
0
20
40
60
80
100
120
–40
–20
0
20
40
60
80
100
120
TEMPERATURE (°C)
TEMPERATURE (°C)
Figure 6. Supply Current (ICC) vs. Temperature
Figure 9. VCC to Reset Delay vs. Temperature
12
500
450
400
350
300
250
200
150
100
50
10
8
V
= 2.5V
TH
V
= 2.93V
TH
6
V
= 5V
TH
4
2
0
0
–40
–20
0
20
40
60
80
100
120
0
0.4 0.8 1.2 1.6 2.0 2.4 2.8
3.2 3.6 4.0 4.4 4.8 5.2 5.6
V
(V)
TEMPERATURE (°C)
CC
Figure 10. Manual Reset to Reset Propagation Delay vs. Temperature
Figure 7. Supply Current (ICC) vs. Supply Voltage (VCC
)
1.20
1.15
1.10
1.05
1.00
0.95
0.90
0.85
0.80
1.05
1.04
1.03
1.02
1.01
1.00
0.99
0.98
0.97
0.96
0.95
–40
–20
0
20
40
60
80
100
120
–40
–20
0
20
40
60
80
100
120
TEMPERATURE (°C)
TEMPERATURE (°C)
Figure 11. Normalized Reset Timeout vs. Temperature
Figure 8. Normalized Reset Threshold vs. Temperature
Rev. C | Page 7 of 15
ADM8316/ADM8318/ADM8319/ADM8320/ADM8321/ADM8322
Data Sheet
1.20
1.15
1.10
1.05
1.00
0.95
0.90
9
8
7
6
5
4
3
2
1
0
NEGATIVE PULSE
POSITIVE PULSE
–40
–20
0
20
40
60
80
100
120
–40
–20
0
20
40
60
80
100
120
TEMPERATURE (°C)
TEMPERATURE (°C)
Figure 12. Normalized Watchdog Timeout vs. Temperature
Figure 15. Watchdog Input Minimum Pulse Width vs. Temperature
160
0.308
RESET ASSERTED ABOVE CURVE
I
I
= 3.2mA
= 800µA
SINK
SINK
140
120
100
80
0.258
0.208
0.158
0.108
0.058
0.008
V
= 2.93V
TH
V
= 5V
TH
V
= 4.63V
TH
60
40
20
0
10
100
OVERDRIVE VOLTAGE (mV)
1000
1.1
1.3
1.5
1.7
1.9
2.1
2.3
2.5
2.7
2.9
V
VOLTAGE (V)
CC
RESET
RESET
Open-Drain VOL Voltage vs. VCC Voltage (VTH = 3 V)
Figure 13. Maximum VCC Transient Duration vs.
Threshold Overdrive
Figure 16.
850
840
830
820
810
0.30
0.25
0.20
0.15
0.10
0.05
0
I
I
= 3.2mA
= 800µA
SINK
SINK
V
= 2.93V
800
790
780
770
760
750
740
730
720
710
700
690
680
670
660
650
TH
V
= 2.5V
TH
V
= 5V
TH
–40
–20
0
20
40
60
80
100
120
1.1 1.3 1.5 1.7 1.9 2.1 2.3 2.5 2.7 2.9 3.1 3.3 3.5 3.7 3.9
TEMPERATURE (°C)
V
VOLTAGE (V)
CC
MR
Figure 14. Manual Reset ( ) Minimum Pulse Width vs. Temperature
RESET
Push-Pull VOL Voltage vs. VCC Voltage (VTH = 4 V)
Figure 17.
Rev. C | Page 8 of 15
Data Sheet
ADM8316/ADM8318/ADM8319/ADM8320/ADM8321/ADM8322
25
24
23
22
21
20
19
18
17
16
3.5
I
I
= 3.2mA
= 800µA
SOURCE
SOURCE
3.0
2.5
2.0
1.5
1.0
0.5
0
2.6 2.8 3.0 3.2 3.4 3.6 3.8 4.0 4.2 4.4 4.6 4.8 5.0 5.2 5.4
1.1
1.3
1.5
1.7
1.9
2.1
2.3
2.5
2.7
2.9
V
VOLTAGE (V)
V
VOLTAGE (V)
CC
CC
RESET
Push-Pull Rise Time vs. VCC Voltage
RESET
Figure 19.
Figure 18.
Push-Pull VOH Voltage vs. VCC Voltage (VTH = 3 V)
Rev. C | Page 9 of 15
ADM8316/ADM8318/ADM8319/ADM8320/ADM8321/ADM8322
Data Sheet
THEORY OF OPERATION
CIRCUIT DESCRIPTION
OPEN-DRAIN RESET OUTPUT
The ADM8316/ADM8318/ADM8319/ADM8320/ADM8321/
ADM8322 provide microprocessor supply voltage supervision
by controlling the microprocessor reset input. Code execution
errors are avoided during power-up, power-down, and brownout
conditions by asserting a reset signal when the supply voltage
is below a preset threshold and by allowing supply voltage
stabilization with a fixed timeout reset delay after the supply
voltage rises above the threshold. In addition, problems with
microprocessor code execution can be monitored and corrected
with a watchdog timer (ADM8316/ADM8318/ADM8320/
ADM8321). If the user detects a problem with system operation, a
manual reset input is available (ADM8316/ADM8319/ADM8320/
ADM8322) to reset the microprocessor, for example, by means
of an external push-button switch.
The ADM8320/ADM8321/ADM8322 have an active low, open-
drain reset output. This output structure requires an external
pull-up resistor to connect the reset output to a voltage rail no
higher than VCC. A resistor that complies with the logic low and
logic high voltage level requirements of the microprocessor
RESET
while supplying input current and leakage paths on the
line is recommended. A 10 kΩ resistor is adequate in most
situations.
MANUAL RESET INPUT
The ADM8316/ADM8319/ADM8320/ADM8322 feature a manual
MR
reset input ( ), which when driven low, asserts the reset output.
MR
When
for the duration of the reset active timeout period before
MR
transitions from low to high, the reset remains asserted
PUSH-PULL RESET OUTPUT
deasserting. The
so that the input is always high when unconnected. An external
MR
input has a 75 kΩ, internal pull-up resistor
The ADM8316 features an active low push-pull reset output,
whereas the ADM8321/ADM8322 have active high push-pull
reset outputs. The ADM8318/ADM8319 feature dual active low
and active high push-pull reset outputs. For active low and active
high outputs, the reset signal is guaranteed to be valid for VCC
down to 0.9 V.
push-button switch can be connected between
and ground
so that the user can generate a reset. Debounce circuitry for this
purpose is integrated on chip. Noise immunity is provided on
MR
the
input, and fast, negative going transients of up to 100 ns
MR
(typical) are ignored. A 0.1 µF capacitor between
provides additional noise immunity.
and ground
The reset output is asserted when VCC is below the reset threshold
MR
(VTH), when
is driven low, or when WDI is not serviced
WATCHDOG INPUT
within the watchdog timeout period (tWD). The reset output
remains asserted for the duration of the reset active timeout
period (tRP) after VCC rises above the reset threshold, after
transitions from low to high, or after the watchdog timer times
out. Figure 20 illustrates the behavior of the reset outputs.
The ADM8316/ADM8318/ADM8320/ADM8321 feature a
watchdog timer that monitors microprocessor activity. A timer
circuit is cleared with every low-to-high or high-to-low logic
transition on the watchdog input pin (WDI), which detects pulses
as short as 50 ns. If the timer counts through the preset watchdog
timeout period (tWD), a reset is asserted. The microprocessor is
required to toggle the WDI pin to avoid asserting the reset pin.
Failure of the microprocessor to toggle WDI within the timeout
period, therefore, indicates a code execution error, and the reset
pulse generated restarts the microprocessor in a known state.
MR
V
CC
V
V
TH
TH
V
CC
1V
0V
V
CC
RESET
RESET
tRP
tRD
0V
V
CC
As well as logic transitions on WDI, the watchdog timer is also
cleared by a reset assertion due to an undervoltage condition on
tRP
1V
0V
tRD
MR
V
CC or due to
being pulled low. When a reset asserts, the
Figure 20. Reset Timing Diagram
watchdog timer clears and does not begin counting again until
the reset deassserts. The watchdog timer can be disabled by
leaving WDI floating or by tristating the WDI driver.
V
CC
V
TH
V
CC
1V
0V
V
CC
RESET
WDI
tRP
tWD
tRP
0V
V
CC
0V
Figure 21. Watchdog Timing Diagram
Rev. C | Page 10 of 15
Data Sheet
ADM8316/ADM8318/ADM8319/ADM8320/ADM8321/ADM8322
APPLICATIONS INFORMATION
WATCHDOG INPUT CURRENT
WATCHDOG SOFTWARE CONSIDERATIONS
To minimize the watchdog input current, leave WDI low for
the majority of the watchdog timeout period. When driven
high, WDI can draw as much as 100 µA. Pulsing WDI low to
high to low at a low duty cycle reduces the effect of the large
input current. When WDI is unconnected, a window comparator
disconnects the watchdog timer from the reset output circuitry
so that a reset is not asserted when the watchdog timer times out.
In implementing the microprocessor watchdog strobe code, quickly
switching WDI low to high and then high to low (minimizing WDI
high time) is desirable for current consumption reasons. However,
a more effective way of using the watchdog function can be
considered.
A low to high to low WDI pulse within a given subroutine
prevents the watchdog from timing out. However, if the sub-
routine becomes stuck in an infinite loop, the watchdog cannot
detect this because the subroutine continues to toggle WDI. A
more effective coding scheme for detecting this error involves
using a slightly longer watchdog timeout. In the program that
calls the subroutine, WDI is set high. The subroutine sets WDI
low when it is called. If the program executes without error, WDI
is toggled high and low with every loop of the program. If the
subroutine enters an infinite loop, WDI is kept low, the watchdog
times out, and the microprocessor is reset (see Figure 23).
NEGATIVE GOING VCC TRANSIENTS
To avoid unnecessary resets caused by fast power supply transients,
the ADM8316/ADM8318/ADM8319/ADM8320/ADM8321/
ADM8322 are equipped with glitch rejection circuitry. The typical
performance characteristic in Figure 13 plots VCC transient
duration vs. reset threshold overdrive. The curves show
combinations of reset threshold overdrive and duration for
which a reset is not generated for 5 V, 4.63 V, and 2.93 V reset
threshold devices. For example, with the 2.93 V threshold, a
transient that goes 100 mV below the threshold and lasts 80 µs
typically does not cause a reset, but if the transient is any larger
in reset threshold overdrive or duration, a reset generates. An
optional 0.1 µF bypass capacitor mounted near VCC provides
additional glitch rejection.
START
SET WDI
HIGH
RESET
PROGRAM
CODE
ENSURING RESET VALID TO VCC = 0 V
Both active low and active high reset outputs are guaranteed to
be valid for VCC as low as 0.9 V. However, by using an external
resistor with push-pull configured reset outputs, valid outputs
for VCC as low as 0 V are possible. For an active low reset output, a
INFINITE LOOP:
WATCHDOG
TIMES OUT
SUBROUTINE
SET WDI
LOW
RESET
resistor connected between
and ground pulls the output
low when it is unable to sink current. For an active high reset
output, a resistor connected between RESET and VCC pulls the
output high when it is unable to source current. Use a large
resistance, such as 100 kΩ, so that it does not overload the
reset output when VCC is greater than 0.9 V.
RETURN
Figure 23. Watchdog Flow Diagram
V
CC
V
CC
V
CC
RESET
RESET
100kΩ
ADM8316
MICROPROCESSOR
I/O
ADM8318/
ADM8319/
ADM8321/
ADM8322
ADM8316/
ADM8318/
ADM8319
MR
WDI
RESET
RESET
100kΩ
Figure 24. Typical Application Circuit
Figure 22. Ensuring Reset Valid to VCC = 0 V
Rev. C | Page 11 of 15
ADM8316/ADM8318/ADM8319/ADM8320/ADM8321/ADM8322
DEVICE MODEL OPTIONS
Data Sheet
The ADM8316/ADM8318/ADM8319 and ADM8320/ADM8321/ADM8322 include many device options; however, not all options are
released for sale. Released options are called standard models and are listed in the Ordering Guide. For the most up to date list of standard
models, refer to the Analog Devices website at www.analog.com/supervisory. Contact an Analog Devices sales representative for information
on nonstandard models, and be aware that samples and production units have long lead times.
Table 6. Selection Table
Output Stage
RESET
Device No.
ADM8316
ADM8318
ADM8319
ADM8320
ADM8321
ADM8322
Watchdog
Yes
Yes
No
Yes
Manual Reset
RESET
No
Push-pull
Push-pull
No
Yes
No
Yes
Yes
No
Yes
Push-pull
Push-pull
Push-pull
Open-drain
Open-drain
Open-drain
Yes
No
Push-pull
Push-pull
Table 7. Reset Timeout Options
Suffix
Minimum
Typical
1.4
28
Maximum
1.8
36
Unit
ms
ms
A
B
1
20
C
D
140
1120
200
1600
260
2080
ms
ms
Table 8. Watchdog Timeout Options
Suffix
Minimum
Typical
6.3
102
1.6
25.6
Maximum
8.1
132
2.24
33.2
Unit
ms
ms
sec
sec
W
X
Y
4.5
72
1.12
18.0
Z
Rev. C | Page 12 of 15
Data Sheet
ADM8316/ADM8318/ADM8319/ADM8320/ADM8321/ADM8322
Table 9. Reset Voltage Threshold Options
TA = 25°C
Typical
TA = −40°C to +125°C
Maximum
5.075
Reset Threshold Number
Minimum
4.950
4.851
4.752
4.653
4.584
4.455
4.346
4.257
4.158
4.059
3.960
3.861
3.762
3.663
3.564
3.465
3.366
3.267
3.168
3.148
3.049
2.970
2.901
2.772
2.673
2.604
2.475
Maximum
5.050
4.949
4.848
4.747
4.676
4.545
4.434
4.343
4.242
4.141
4.040
3.939
3.838
3.737
3.636
3.535
3.434
3.333
3.232
3.212
3.111
3.030
2.959
2.828
2.727
2.656
2.525
Minimum
4.925
4.826
4.728
4.629
4.560
4.432
4.324
4.235
4.137
4.038
3.940
3.841
3.743
3.644
3.546
3.447
3.349
3.250
3.152
3.132
3.033
2.955
2.886
2.758
2.659
2.590
2.462
Unit
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
3N
31
30
29
28
27
26
25
5.000
4.900
4.800
4.700
4.630
4.500
4.390
4.300
4.200
4.100
4.00
3.900
3.800
3.700
3.600
3.500
3.400
3.300
3.200
3.180
3.080
3.000
2.930
2.800
2.700
2.630
2.500
4.974
4.872
4.771
4.700
4.568
4.456
4.365
4.263
4.162
4.060
3.959
3.857
3.756
3.654
3.553
3.451
3.350
3.248
3.228
3.127
3.045
2.974
2.842
2.741
2.670
2.538
Rev. C | Page 13 of 15
ADM8316/ADM8318/ADM8319/ADM8320/ADM8321/ADM8322
OUTLINE DIMENSIONS
Data Sheet
3.00
2.90
2.80
5
1
4
3
3.00
2.80
2.60
1.70
1.60
1.50
2
0.95 BSC
1.90
BSC
1.30
1.15
0.90
0.20 MAX
0.08 MIN
1.45 MAX
0.95 MIN
0.55
0.45
0.35
0.15 MAX
0.05 MIN
10°
5°
0°
SEATING
PLANE
0.60
BSC
0.50 MAX
0.35 MIN
COMPLIANT TO JEDEC STANDARDS MO-178-AA
Figure 25. 5-Lead Small Outline Transistor Package [SOT-23]
(RJ-5)
Dimensions shown in millimeters
ADM83
W
ARJZR7
ORDERING QUANTITY
R7: 3000-PIECE REEL, RoHS COMPLIANT
GENERIC NUMBER
(16 TO 22)
Z: RoHS COMPLIANT
W: AUTOMOTIVE QUAL
PACKAGE CODE
RJ: 5-LEAD SOT-23
RESET TIMEOUT PERIOD
TEMPERATURE RANGE
A: –40°C TO +125°C
A: 1ms (MIN)
B: 20ms (MIN)
C: 140ms (MIN)
D: 1120ms (MIN)
RESET THRESHOLD NUMBER
(25 TO 50)
WATCHDOG TIMEOUT PERIOD
W: 6.3ms (TYP)
X: 102ms (TYP)
Y: 1.6sec (TYP)
Z: 25.6sec (TYP)
Figure 26. Ordering Code Structure
Rev. C | Page 14 of 15
Data Sheet
ADM8316/ADM8318/ADM8319/ADM8320/ADM8321/ADM8322
ORDERING GUIDE
Typical
Reset
Minimum
Watchdog
Temperature
Range
Threshold Reset Timeout Timeout
(V)
Package
Description
Package Ordering Marking
Option Quantity Code
Model1, 2, 3, 4
(ms)
1
20
(sec)
1.6
ADM8316WAY27ARJZR7
ADM8316WBX30ARJZR7
ADM8316WBX46ARJZR7
−40°C to +125°C 2.7
−40°C to +125°C
−40°C to +125°C 4.63
5-Lead SOT-23 RJ-5
5-Lead SOT-23 RJ-5
5-Lead SOT-23 RJ-5
5-Lead SOT-23 RJ-5
5-Lead SOT-23 RJ-5
5-Lead SOT-23 RJ-5
5-Lead SOT-23 RJ-5
5-Lead SOT-23 RJ-5
5-Lead SOT-23 RJ-5
5-Lead SOT-23 RJ-5
5-Lead SOT-23 RJ-5
5-Lead SOT-23 RJ-5
5-Lead SOT-23 RJ-5
5-Lead SOT-23 RJ-5
5-Lead SOT-23 RJ-5
5-Lead SOT-23 RJ-5
5-Lead SOT-23 RJ-5
5-Lead SOT-23 RJ-5
5-Lead SOT-23 RJ-5
3,000
3,000
3,000
3,000
3,000
3,000
3,000
3,000
3,000
3,000
3,000
3,000
3,000
3,000
3,000
3,000
3,000
3,000
3,000
LMT
LMT
LMT
LTG
3
0.102
0.102
0.0063
25.6
1.6
N/A5
0.102
1.6
20
ADM8316WDW49ARJZR7 −40°C to +125°C 4.9
1120
1120
140
20
ADM8316WDZ30ARJZR7
ADM8318WCY46ARJZR7
ADM8319WB31ARJZR7
−40°C to +125°C
3
LTF
−40°C to +125°C 4.63
−40°C to +125°C 3.08
ADM8320WBX3NARJZR7 −40°C to +125°C 3.18
LMW
LMV
LUT
20
ADM8320WCY29ARJZR7
ADM8320WCZ29ARJZR7
ADM8320WCZ33ARJZR7
−40°C to +125°C 2.93
−40°C to +125°C 2.93
−40°C to +125°C 3.3
140
140
140
1
1
1
140
20
140
140
140
LMX
LMX
LMX
LMY
LMY
LMY
LMY
LUS
1.6
25.6
0.0063
0.102
1.6
ADM8321WAW30ARJZR7 −40°C to +125°C
3
3
3
ADM8321WAX30ARJZR7
ADM8321WAY30ARJZR7
ADM8321WCY46ARJZR7
ADM8322WB26ARJZRL7
ADM8322WC26ARJZR7
ADM8322WC46ARJZR7
ADM8322WC31ARJZR7
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C 4.63
−40°C to +125°C 2.63
−40°C to +125°C 2.63
−40°C to +125°C 4.63
−40°C to +125°C 3.08
1.6
N/A5
N/A5
N/A5
N/A5
LUS
LMZ
LMZ
1 The ADM8316/ADM8318/ADM8319 and ADM8320/ADM8321/ADM8322 include many device options; however, not all options are released for sale. Released options are
called standard models and are listed in the Ordering Guide. For the most up to date list of standard models, refer to the Analog Devices website at www.analog.com/supervisory.
Contact an Analog Devices sales representative for information on nonstandard models, and be aware that samples and production units have long lead times.
2 If ordering nonstandard models, complete the ordering code shown in Figure 26 by inserting the reset timeout, watchdog timeout, and reset threshold
(ADM8316/ADM8318/ADM8320/ADM8321) suffixes from Table 7 to Table 9. No watchdog timeout is available for ADM8319/ADM8322.
3 Z = RoHS Compliant Part.
4 W = Qualified for Automotive Applications.
5 N/A means not applicable.
AUTOMOTIVE PRODUCTS
The ADM8316W/ADM8318W/ADM8319W/ADM8320W/ADM8321W/ADM8322W models are available with controlled manufacturing to
support the quality and reliability requirements of automotive applications. Note that these automotive models may have specifications
that differ from the commercial models; therefore, designers should review the Specifications section of this data sheet carefully. Only the
automotive grade products shown are available for use in automotive applications. Contact your local Analog Devices account representative for
specific product ordering information and to obtain the specific Automotive Reliability reports for these models.
©2013–2018 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
D11779-0-2/18(C)
Rev. C | Page 15 of 15
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