Supervisory Circuits with Watchdog
and Manual Reset in 5-Lead SOT-23
Preliminary Technical Data
ADM6316–ADM6322
Rev. PrB
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FEATURES
26 Reset Threshold Options:
2.5V to 5V in 100mV Increments
4 Reset Timeout Options:
1ms, 20ms, 140ms and 1120ms (Min)
4 Watchdog Timeout Options:
6.3ms, 102ms, 1600ms and 25.6s (Typ)
Manual Reset Input
Reset Output Stages
Push-Pull Active-Low
Open-Drain Active-Low
Push-Pull Active-High
Low Power Consumption (3µA)
Guaranteed Reset Output valid to VCC=1V
Power Supply Glitch Immunity
Specified Over Industrial Temperature Range
5-Lead SOT-23 Package
APPLICATIONS
Microprocessor Systems
Computers
Controllers
Intelligent Instruments
Portable Equipment
GENERAL DESCRIPTION
The ADM6316-ADM6322 are supervisory circuits which
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 means of an
external push-button, through a manual reset input. The seven
parts feature different combinations of watchdog input, manual
reset input and output stage configuration, as shown in table 1.
FUNCTIONAL BLOCK DIAGRAM
RESET
GENERATOR
MR
DEBOUNCE
GND
RESET
V
CC
V
REF
V
CC
ADM6316
WATCHDOG
DETECTOR
WDI
Each part is available in a choice of 26 reset threshold options
ranging from 2.5V to 5V in 100mV increments. There are also 4
reset timeout options of 1ms, 20ms, 140ms and 1120ms (min)
and 4 watchdog timeout options of 6.3ms 102ms, 1600ms and
25.6s (typ).
The ADM6316-ADM6322 are available in 5-lead SOT-23
packages and typically consume only 3µA, making them
suitable for use in low power portable applications.
Table 1. Selection Table
Output Stage
Part No. Watchdog Manual Reset RESET RESET
ADM6316 Yes Yes Push-Pull -
ADM6317 Yes Yes - Push-Pull
ADM6318 Yes - Push-Pull Push-Pull
ADM6319 - Yes Push-Pull Push-Pull
ADM6320 Yes Yes Open-Drain -
ADM6321 Yes - Open-Drain Push-Pull
ADM6322 - Yes Open-Drain Push-Pull
ADM6316–ADM6322 Preliminary Technical Data
Rev.PrB | Page 2 of 8
ADM6316-ADM6322—SPECIFICATIONS
Table 2. VCC=Full Operating Range, TA=TMIN to TMAX, unless otherwise noted
Parameter Min Typ Max Units Test Conditions/Comments
SUPPLY
VCC Operating Voltage Range 1 5.5 V
Supply Current 10 20 µA VCC=5.5V
5 12 µA VCC=3.6V
RESET THRESHOLD VOLTAGE
VTH-1.5% VTH V
TH+1.5% V TA=+25°C
VTH-2.5% VTH V
TH+2.5% V TA=-40°C to +85°C
RESET THRESHOLD TEMPERATURE COEFFICIENT 40 ppm/°C
RESET THRESHOLD HYSTERESIS 3 mV
RESET TIMEOUT PERIOD
ADM63__A 1 1.4 2 ms
ADM63__B 20 28 40 ms
ADM63__C 140 200 280 ms
ADM63__D 1120 1600 2240 ms
VCC TO RESET DELAY 40 µs VCC falling at 1mV/µs
PUSH-PULL OUTPUT (ADM6316, ADM6317, ADM6318,
ADM6319, ADM6321, ADM6322)
RESET Output Voltage 0.3 V VCC>=1.0V, ISINK=50µA
0.3 V VCC>=1.2V, ISINK=100µA
0.3 V VCC>=2.7V, ISINK=1.2mA
0.4 V VCC>=4.5V, ISINK=3.2mA
0.8x VCC V VCC>=2.7V, ISOURCE=500µA
V
CC-1.5 V VCC>=4.5V, I SOURCE=800µA
RESET Rise Time 5 25 ns
From 10% to 90% VCC, CL=5pF,
VCC =3.3V
RESET Output Voltage 0.3 V VCC>=2.7V, ISINK=1.2mA
0.4 V VCC>=4.5V, ISINK=3.2mA
0.8x VCC V VCC>=1.8V, ISOURCE=150µA
0.8x VCC V VCC>=2.7V, ISOURCE=500µA
V
CC-1.5 VCC>=4.5V, I SOURCE=800µA
OPEN-DRAIN OUTPUT (ADM6320, ADM6321,
ADM6322)
RESET Output Voltage 0.3 V VCC>=1.0V, ISINK=50µA
0.3 V VCC>=1.2V, ISINK=100µA
0.3 V VCC>=2.7V, ISINK=1.2mA
0.4 V VCC>=4.5V, ISINK=3.2mA
Open-Drain Reset Output Leakage Current 1 µA
WATCHDOG INPUT (ADM6316, ADM6317, ADM6318,
ADM6320, ADM6321)
Watchdog Timeout Period 4.3 6.3 9.3 ms ADM63___W
71 102 153 ms ADM63___X
1.12 1.6 2.4 s ADM63___Y
17.9 25.6 38.4 s ADM63___Z
WDI Pulse Width 50 ns VIL=0.3xVCC, VIH=0.7xVCC,
WDI Input Threshold 0.3xVCC V
0.7xVCC V
WDI Input Current 120 160 µA VWDI= VCC, time average
-20 -15 µA VWDI=0, time average
Preliminary Technical Data ADM6316–ADM6322
Rev.PrB | Page 3 of 8
Parameter Min Typ Max Units Test Conditions/Comments
MANUAL RESET INPUT (ADM6316, ADM6317,
ADM6319, ADM6320, ADM6322)
MR Input Threshold 0.8 V VTH>4.0V
2.0 V VTH>4.0V
0.3xVCC V VTH<4.0V
0.7xVCC V VTH<4.0V
MR Input Pulse Width 1 µs
MR Glitch Rejection 100 ns
MR Pull-up Resistance 35 52 75 k⍀
MR to Reset Delay 230 ns VCC=5V
ABSOLUTE MAXIMUM RATINGS
Table 3. TA = 25°C unless otherwise noted.
Parameter Rating
VCC -0.3V to +6V
RESET (ADM6320, ADM6321, ADM6322) -0.3V to +6V
Output Current (RESET, RESET) 20mA
Operating Temperature Range -40°C to +85°C
Storage Temperature Range -65°C to +125°C
θJA Thermal Impedance, SOT-23 270°C/W
Lead Temperature
Soldering (10 sec) 300°C
Vapour Phase (60 sec) 215°C
Infrared (15 sec) 220°C
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only and functional operation of the device at these or
any other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
ADM6316–ADM6322 Preliminary Technical Data
Rev.PrB | Page 4 of 8
PIN CONFIGURATIONS AND FUNCTIONAL DESCRIPTIONS
1
2
34
5
ADM6316/
ADM6320
TOP VIEW
(Not to Scale)
VCC
RESET
GND
MR WDI
1
2
34
5
ADM6317
TOP VIEW
(Not to Scale)
VCC
RESET
GND
MR WDI
1
2
34
5
ADM6318/
ADM6321
TOP VIEW
(Not to Scale)
VCC
RESET
GND
RESET WDI
1
2
34
5
ADM6319/
ADM6322
TOP VIEW
(Not to Scale)
VCC
RESET
GND
RESET MR
Table 4. Pin Functional Descriptions
Pin No. Name Description
1 RESET (ADM6316/18/19/20/21/22) Active-Low Reset Output, which is asserted whenever VCC is below the reset.threshold, VTH.
Push-Pull Output Stage for ADM6316/18/19.
Open-Drain Output Stage for ADM6320/21/22.
RESET (ADM6317) Active-High, Push-Pull Reset Output.
2 GND Ground
3 MR (ADM6316/17/20) Manual Reset Input. This is an active-low input which, when forced low for at least 1µs,
generates a reset.
Features a 52k⍀ internal pull-up.
RESET (ADM6318/19/21/22) Active-High, Push-Pull Reset Output.
4 WDI (ADM6316/17/18/20/21) 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 floating to disable the watchdog timer.
MR (ADM6319/22) Manual Reset Input.
5 VCC Power Supply Voltage being Monitored
ESD CAUTION
`
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the
human body and test equipment and can discharge without detection. Although this product features
proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy
electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance
degradation or loss of functionality.
Preliminary Technical Data ADM6316–ADM6322
Rev.PrB | Page 5 of 8
TYPICAL PERFORMANCE CHARACTERISTICS
Figure 1. Supply Current vs. Temperature
(ADM6316/ADM6317/ADM6318/ADM6320/ADM6321)
Figure 2. VCC Falling to Reset Propagation Delay vs. Temperature
Figure 3. Manual Reset to Reset Propagation Delay vs. Temperature
(ADM6316/ADM6317/ADM6319/ADM6320/ADM6322)
Figure 4. Normalized Reset Timeout Period vs. Temperature
Figure 5. Normalized Watchdog Timeout Period vs. Temperature
(ADM6316/ADM6317/ADM6318/ADM6320/ADM6321)
Figure 6. Maximum VCC Transient Duration vs. Reset Threshold Overdrive
ADM6316–ADM6322 Preliminary Technical Data
Rev.PrB | Page 6 of 8
Table 5. Reset Threshold Options
Table 6. Reset Timeout Options
Table 7. Watchdog Timeout Options
Table 8. Standard Models
TA=+25°C TA=-40°C to +85°C
Part No. Min Typ Max Min Max
ADM63__50 4.925 5.000 5.075 4.875 5.125
ADM63__49 4.827 4.900 4.974 4.778 5.023
ADM63__48 4.728 4.800 4.872 4.680 4.920
ADM63__47 4.630 4.700 4.771 4.583 4.818
ADM63__46 4.561 4.630 4.699 4.514 4.746
ADM63__45 4.433 4.500 4.568 4.388 4.613
ADM63__44 4.314 4.390 4.446 4.270 4.490
ADM63__43 4.236 4.300 4.365 4.193 4.408
ADM63__42 4.137 4.200 4.263 4.095 4.305
ADM63__41 4.039 4.100 4.162 3.998 4.203
ADM63__40 3.940 4.00 4.060 3.900 4.100
ADM63__39 3.842 3.900 3.959 3.803 3.998
ADM63__38 3.743 3.800 3.857 3.705 3.895
ADM63__37 3.645 3.700 3.756 3.608 3.793
ADM63__36 3.546 3.600 3.654 3.510 3.690
ADM63__35 3.448 3.500 3.553 3.413 3.588
ADM63__34 3.349 3.400 3.451 3.315 3.485
ADM63__33 3.251 3.300 3.350 3.218 3.383
ADM63__32 3.152 3.200 3.248 3.120 3.280
ADM63__31 3.034 3.080 3.126 3.003 3.157
ADM63__30 2.955 3.000 3.045 2.925 3.075
ADM63__29 2.886 2.930 2.974 2.857 3.000
ADM63__28 2.758 2.800 2.842 2.730 2.870
ADM63__27 2.660 2.700 2.741 2.633 2.768
ADM63__26 2.591 2.630 2.669 2.564 2.696
ADM63__25 2.463 2.500 2.538 2.438 2.563
Suffix Min Typ Max Units
A 1 1.6 2 ms
B 20 30 40 ms
C 140 200 280 ms
D 1.12 1.60 2.24 s
Suffix Min Typ Max Units
W 4.3 6.3 9.3 ms
X 71 102 153 ms
Y 1.12 1.6 2.4 s
Z 17.9 25.6 38.4 s
Model Reset Threshold (V) Minimum Reset Timeout (ms) Typical Watchdog Timeout (s)
ADM6316LARJ29CY 2.93 140 1.6
ADM6316LARJ46CY 4.63 140 1.6
ADM6318LHARJ46CY 4.63 140 1.6
ADM6319LHARJ46C 4.63 140 1.6
ADM6320PARJ29CY 2.93 140 1.6
ADM6320PARJ46CY 4.63 140 1.6
ADM6321HPARJ46CY 4.63 140 1.6
ADM6322HPARJ46C 4.63 140 1.6
Preliminary Technical Data ADM6316–ADM6322
Rev.PrB | Page 7 of 8
OUTLINE DIMENSIONS
PIN 1
1.60 BSC 2.80 BSC
1.90
BSC
0.95 BSC
1 3
4 5
2
0.22
0.08
10
5
0
0.50
0.3
0.15 MAX SEATING
PLANE
1.45 MAX
1.30
1.15
0.90
2.90 BSC
0.$
0.45
0.3
COMPLIANT TO JEDEC STANDARDS MO-178AA
Figure 7. 5-Lead Small Outline Transistor Package [SOT-23]
(RJ-5)
Dimensions shown in millimeters
ADM6316–ADM6322 Preliminary Technical Data
Rev.PrB | Page 8 of 8
ORDERING GUIDE
ADM63__ __ A RJ __ __ __
Generic No.
(16 - 22)
Output Configuration:
L: Active-Low
H: Active-High
P: Open-Drain
Temperature Range:
A: -40 C to +85C
Package Code:
RJ: 5-Lead SOT-23
Reset Threshold No.
(25 - 50)
Reset Timeout Period
A: 1ms (min)
B: 20ms (min)
C: 140ms (min)
D: 1120ms (min)
Watchdog Timeout Period
W: 6.3ms (typ)
X: 102ms (typ)
Y: 1.6s (typ)
Z: 25s (typ)
Figure 8. Ordering Code Structure
1 Contact factory for availability of non-standard models (See table 8 for list of standard models)
Model1 Temperature Range Quantity Package Type Branding
ADM6316__ARJ __ _ _ -RL -40°C to +85°C 10k SOT-23-5 N00
ADM6316__ARJ __ _ _ -R7 -40°C to +85°C 3k SOT-23-5 N00
ADM6317__ARJ __ _ _ -RL -40°C to +85°C 10k SOT-23-5 N01
ADM6317__ARJ __ _ _ -R7 -40°C to +85°C 3k SOT-23-5 N01
ADM6318__ARJ __ _ _ -RL -40°C to +85°C 10k SOT-23-5 N02
ADM6318__ARJ __ _ _ -R7 -40°C to +85°C 3k SOT-23-5 N02
ADM6319__ARJ __ _ _ -RL -40°C to +85°C 10k SOT-23-5 N03
ADM6319__ARJ __ _ _ -R7 -40°C to +85°C 3k SOT-23-5 N03
ADM6320__ARJ __ _ _ -RL -40°C to +85°C 10k SOT-23-5 N04
ADM6320__ARJ __ _ _ -R7 -40°C to +85°C 3k SOT-23-5 N04
ADM6321__ARJ __ _ _ -RL -40°C to +85°C 10k SOT-23-5 N05
ADM6321__ARJ __ _ _ -R7 -40°C to +85°C 3k SOT-23-5 N05
ADM6322__ARJ __ _ _ -RL -40°C to +85°C 10k SOT-23-5 N06
ADM6322__ARJ __ _ _ -R7 -40°C to +85°C 3k SOT-23-5 N06
© 2004 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective companies.
Printed in the U.S.A. PR04533-0-3/04(PrB)
A: -40°C to +85°C
