Supervisory Circuits with Watchdog
and Manual Reset in 5-Lead SOT-23
ADM6316/ADM6317/ADM6318/ADM6319/ADM6320/ADM6321/ADM6322
Rev.PrC
Information furnished by Analog Devices is believed to be accurate and reliable.
However, no responsibility is assumed by Analog Devices for its use, nor for any
infringements of patents or other rights of third parties that may result from its use.
Specifications subject to change without notice. No license is granted by implication
or otherwise under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.326.8703
2004 Analog Devices, Inc. All rights reserved.
FEATURES
26 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 (Min)
4 watchdog timeout options:
6.3 ms, 102 ms, 1600 ms, 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 (3 A)
Guaranteed reset output valid to V
CC
= 1 V
Power supply glitch immunity
Specified over industrial temperature range
5-lead SOT-23 package
APPLICATIONS
Microprocessor systems
Computers
Controllers
Intelligent instruments
Portable equipment
FUNCTIONAL BLOCK DIAGRAM
ADM6316
V
CC
V
CC
MR
GND
WDI
RESET
RESET
GENERATOR
WATCHDOG
DETECTOR
DEBOUNCE
V
REF
04533-0-001
Figure 1.
GENERAL DESCRIPTION
The ADM6316/ADM6317/ADM6318/ADM6319/ADM6320/
ADM6321/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.
Each part is available in a choice of 26 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
(min) and four watchdog timeout options of 6.3 ms, 102 ms,
1600 ms, and 25.6s (typ).
The ADM6316-ADM6322 are available in 5-lead SOT-23
packages and typically consume only 3 A, 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
PRELIMINARY TECHNICAL DATA
ADM6316/ADM6317/ADM6318/ADM6319/ADM6320/ADM6321/ADM6322
Rev.PrC | Page 2 of 11
TABLE OF CONTENTS
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 5
ESD Caution.................................................................................. 5
Pin Configurations and Function Descriptions ........................... 6
Typical Performance Characteristics ..............................................7
Outline Dimensions ....................................................................... 10
Ordering Guide .......................................................................... 11
PRELIMINARY TECHNICAL DATA
ADM6316/ADM6317/ADM6318/ADM6319/ADM6320/ADM6321/ADM6322
Rev.PrC | Page 3 of 11
SPECIFICATIONS
V
CC
= full operating range, T
A
= T
MIN
to T
MAX
, unless otherwise noted.
Table 2.
Parameter Min
Typ
Max
Unit
Test
Conditions/Comments
SUPPLY
V
CC
Operating Voltage Range
1
5.5
V
Supply
Current
10 20 A V
CC
= 5.5 V
5
12
A
V
CC
= 3.6 V
RESET THRESHOLD VOLTAGE
V
TH
-
1.5%
V
TH
V
TH
+
1.5%
V T
A
= +25C
V
TH
-
2.5%
V
TH
V
TH
+
2.5%
V T
A
= -40C to +85C
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
V
CC
TO RESET DELAY
40
s
V
CC
falling at 1 mV/s
PUSH-PULL OUTPUT (ADM6316, ADM6317, ADM6318,
ADM6319,
ADM6321,
ADM6322)
RESET Output Voltage
0.3
V
V
CC
> = 1.0 V, I
SINK
= 50 A
0.3
V
V
CC
> = 1.2 V, I
SINK
= 100 A
0.3
V
V
CC
> = 2.7 V, I
SINK
= 1.2 mA
0.4
V
V
CC
> = 4.5 V, I
SINK
= 3.2 mA
0.8 V
CC
V
V
CC
> = 2.7 V, I
SOURCE
= 500 A
V
CC
- 1.5
V
V
CC
> = 4.5 V, I
SOURCE
= 800 A
RESET Rise Time
5
25
ns
From 10% to 90% V
CC
, C
L
= 5 pF,
V
CC
= 3.3 V
RESET
Output
Voltage
0.3
V
V
CC
> = 2.7 V, I
SINK
= 1.2 mA
0.4
V
V
CC
> = 4.5 V, I
SINK
= 3.2 mA
0.8 V
CC
V
V
CC
> = 1.8 V, I
SOURCE
= 150 A
0.8 V
CC
V
V
CC
> = 2.7 V, I
SOURCE
= 500 A
V
CC
1.5
V
CC
> = 4.5 V, I
SOURCE
= 800 A
OPEN-DRAIN OUTPUT (ADM6320, ADM6321,
ADM6322)
RESET Output Voltage
0.3
V
V
CC
> = 1.0 V, I
SINK
= 50 A
0.3
V
V
CC
> = 1.2 V, I
SINK
= 100 A
0.3
V
V
CC
> = 2.7 V, I
SINK
= 1.2 mA
0.4
V
V
CC
> = 4.5 V, I
SINK
= 3.2 mA
Open-Drain Reset Output Leakage Current
1
A
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
V
IL
= 0.3 V
CC
, V
IH
= 0.7 V
CC
,
PRELIMINARY TECHNICAL DATA
ADM6316/ADM6317/ADM6318/ADM6319/ADM6320/ADM6321/ADM6322
Rev.PrC | Page 4 of 11
Parameter Min
Typ
Max
Unit
Test
Conditions/Comments
WDI Input Threshold
0.3 V
CC
V
0.7
V
CC
V
WDI Input Current
120
160
A
V
WDI
= V
CC
, time average
-20 -15
A V
WDI
= 0, time average
MANUAL RESET INPUT (ADM6316, ADM6317,
ADM6319, ADM6320, ADM6322)
MR Input Threshold
0.8
V
V
TH
> 4.0 V
2.0
V
V
TH
> 4.0 V
0.3 V
CC
V
V
TH
<4.0 V
0.7
V
CC
V
V
TH
< 4.0 V
MR Input Pulse Width
1
s
MR Glitch Rejection
100
ns
MR Pull-up Resistance
35 52 75 k
MR to Reset Delay
230
ns
V
CC
= 5V
PRELIMINARY TECHNICAL DATA
ADM6316/ADM6317/ADM6318/ADM6319/ADM6320/ADM6321/ADM6322
Rev.PrC | Page 5 of 11
ABSOLUTE MAXIMUM RATINGS
T
A
= 25C, unless otherwise noted.
Table 3.
Parameter
Rating
V
CC
0.3 V to +6 V
RESET (ADM6320, ADM6321, ADM6322)
0.3 V to +6 V
Output Current (RESET, RESET)
20 mA
Operating Temperature Range
40C to +85C
Storage Temperature Range
65C to +125C
JA
Thermal Impedance, SOT-23
270C/W
Lead Temperature
Soldering (10 sec)
300C
Vapour Phase (60 sec)
215C
Infrared (15 sec)
220C
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.
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/ADM6317/ADM6318/ADM6319/ADM6320/ADM6321/ADM6322
Rev.PrC | Page 6 of 11
PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS
ADM6316/
ADM6320
TOP VIEW
(Not to Scale)
RESET
1
GND
2
MR
3
V
CC
WDI
5
4
04533-0-002
Figure 2. ADM6316/ADM6320 Pin Configuration
ADM6317
TOP VIEW
(Not to Scale)
RESET
1
GND
2
MR
3
V
CC
WDI
5
4
04533-0-003
Figure 3. ADM6317 Pin Configuration
ADM6318/
ADM6321
TOP VIEW
(Not to Scale)
RESET
1
GND
2
RESET
3
V
CC
WDI
5
4
04533-0-004
Figure 4. ADM6318/ADM6321 Pin Configuration
ADM6319/
ADM6322
TOP VIEW
(Not to Scale)
RESET
1
GND
2
RESET
3
V
CC
MR
5
4
04533-0-004
Figure 5. ADM6319/ADM6322 Pin Configuration
Table 4. Pin Function Descriptions
Pin No.
Mnemonic
Description
1
RESET (ADM6316/ADM6318/
ADM6319/ADM6320/ADM6321/
ADM6322)
Active-Low Reset Output. Asserted whenever V
CC
is below the reset threshold, V
TH
.
Push-Pull Output Stage for the ADM6316/ADM6318/ADM6319.
Open-Drain Output Stage for the ADM6320/ADM6321/ADM6322.
RESET (ADM6317)
Active-High, Push-Pull Reset Output.
2 GND
Ground.
3
MR (ADM6316/ADM6317/
ADM6320)
Manual Reset Input. This is an active-low input which, when forced low for at least 1 s,
generates a reset. It features a 52 k internal pull-up.
RESET (ADM6318/ADM6319/
ADM6321/ADM6322)
Active-High, Push-Pull Reset Output.
4
WDI
(ADM6316/ADM6317/
ADM6318/ADM6320/ADM6321)
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/ADM6322)
Manual Reset Input.
5 V
CC
Power Supply Voltage Being Monitored.
PRELIMINARY TECHNICAL DATA
ADM6316/ADM6317/ADM6318/ADM6319/ADM6320/ADM6321/ADM6322
Rev.PrC | Page 7 of 11
TYPICAL PERFORMANCE CHARACTERISTICS
04533-0-006
TEMPERATURE (C)
40
20
0
20
40
60
80
I
CC
(
A)
10.0
9.0
9.5
8.0
7.5
8.5
7.0
6.5
6.0
5.5
5.0
4.5
4.0
3.5
V
CC
= 5V
V
CC
= 3V
V
CC
= 1.5V
Figure 6. Supply Current vs. Temperature
(ADM6316/ADM6317/ADM6318/ADM6320/ADM6321)
04533-0-007
V
CC
(V)
5.5
0
2.0
1.5
1.0
0.5
2.5
3.0
3.5
4.0
4.5
5.0
I
CC
(
A)
80
70
75
60
55
65
50
45
40
35
30
20
10
25
15
5
0
Figure 7. Supply Current vs. Supply Voltage
04533-0-008
TEMPERATURE (C)
40
40
20
0
20
60
80
N
OR
M
A
L
IZED
R
ESET TH
R
ESH
OLD
1.05
1.03
1.04
1.01
1.00
1.02
0.99
0.98
0.97
0.96
0.95
Figure 8. Normalized Reset Threshold vs. Temperature
04533-0-009
TEMPERATURE (C)
40
40
20
0
20
60
80
V
CC
TO RESET DELAY (
s)
100
80
90
60
50
70
40
30
20
10
0
Figure 9. V
CC
Falling to Reset Propagation Delay vs. Temperature
04533-0-010
TEMPERATURE (C)
40
40
20
0
20
60
80
MANUAL RE
S
E
T TO RE
S
E
T DE
LAY
(ns
)
340
300
320
260
240
280
220
200
180
160
140
120
100
Figure 10. Manual Reset to Reset Propagation Delay vs. Temperature
(ADM6316/ADM6317/ADM6319/ADM6320/ADM6322)
04533-0-011
TEMPERATURE (C)
40
40
20
0
20
60
80
N
OR
M
A
L
IZED
R
ESET TIM
E
OU
T
1.20
1.10
1.15
1.00
0.95
1.05
0.90
0.85
0.80
Figure 11. Normalized Reset Timeout Period vs. Temperature
PRELIMINARY TECHNICAL DATA
ADM6316/ADM6317/ADM6318/ADM6319/ADM6320/ADM6321/ADM6322
Rev.PrC | Page 8 of 11
04533-0-012
TEMPERATURE (C)
40
60
40
80
20
0
20
NORMALIZE
D
WATCHDOG TIME
OUT
1.20
1.15
1.10
1.05
1.00
0.95
0.90
Figure 12. Normalized Watchdog Timeout Period vs. Temperature
(ADM6316/ADM6317/ADM6318/ADM6320/ADM6321)
04533-0-013
OVER DRIVE VOD (mV)
1000
10
100
MAX
I
MUM TRANS
IE
NT DURATION (
s)
160
120
140
100
60
80
40
20
0
V
TH
= 4.9V
V
TH
= 2.93V
Figure 13. Maximum V
CC
Transient Duration vs. Reset Threshold Overdrive
04533-0-014
TEMPERATURE (C)
50
0
50
MR MINIMUM P
U
LS
E
WIDTH (ns
)
190
160
180
170
150
130
140
120
110
100
Figure 14. Manual Reset Minimum Pulse Width vs. Temperature
(ADM6316/ADM6317/ADM6319/ADM6320/ADM6322)
04333-0-015
TEMPERATURE (C)
40
10
60
MINIMUM P
U
LS
E
WIDTH (
n
s
)
3.8
3.2
3.6
3.4
3.0
2.6
2.8
2.4
2.2
2.0
NEGATIVE PULSE
POSITIVE PULSE
Figure 15. Watchdog Input Minimum Pulse Width vs. Temperature
(ADM6316/ADM6317/ADM6318/ADM6320/ADM6321)
PRELIMINARY TECHNICAL DATA
ADM6316/ADM6317/ADM6318/ADM6319/ADM6320/ADM6321/ADM6322
Rev.PrC | Page 9 of 11
Table 5. Reset Threshold Options
Table 6. Reset Timeout Options
Suffix Min
Typ
Max
Unit
A 1
1.6
2
ms
B
20 30 40 ms
C
140 200 280 ms
D
1.12 1.60 2.24 s
Table 7. Watchdog Timer Operations
Suffix Min
Typ
Max
Unit
W
4.3 6.3 9.3 ms
X 71
102
153
ms
Y 1.12
1.6
2.24
s
Z
17.9 25.6 38.4 s
Table 8. Standard Models
T
A
= +25C
T
A
= -40C to +85C
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
Model
Reset Threshold (V)
Minimum Reset Timeout (ms)
Typical Watchdog Timeout (s)
ADM6316CY29ARJ 2.93
140
1.6
ADM6316CY46ARJ 4.63
140
1.6
ADM6318CY46ARJ 4.63
140
1.6
ADM6319C46ARJ 4.63
140
1.6
ADM6320CY29ARJ 2.93
140
1.6
ADM6320CY46ARJ 4.63
140
1.6
ADM6321CY46ARJ 4.63
140
1.6
ADM6322C46ARJ 4.63
140
1.6
PRELIMINARY TECHNICAL DATA
ADM6316/ADM6317/ADM6318/ADM6319/ADM6320/ADM6321/ADM6322
Rev.PrC | Page 10 of 11
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
0.30
0.15 MAX
SEATING
PLANE
1.45 MAX
1.30
1.15
0.90
2.90 BSC
0.60
0.45
0.30
COMPLIANT TO JEDEC STANDARDS MO-178AA
Figure 16. 5-Lead Small Outline Transistor Package [SOT-23]
(RJ-5)
Dimensions shown in millimeters
PRELIMINARY TECHNICAL DATA
ADM6316/ADM6317/ADM6318/ADM6319/ADM6320/ADM6321/ADM6322
Rev.PrC | Page 11 of 11
ORDERING GUIDE
ADM63__ __ __ __ A RJ - __
Generic No.
(16 - 22)
Temperature Range:
A: -40 C to +85
C
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)
Ordering Quantity:
RL7: 10,000 piece Reel
RL: 3,000 piece Reel
Figure 17. Ordering Code Structure
1
Complete the ordering code by inserting reset timeout, watchdog timeout (ADM6316/17/18/20/21) and reset threshold suffixes from tables 5 to 7.
2
Contact the factory for the availability of nonstandard models. See Table 8 for a list of standard models.
Model
12
Temperature
Range
Quantity
Package Option
Branding
ADM6316 _ _ __ ARJ-RL7
-40C to +85C
3k
SOT-23-5
N00
ADM6317 _ _ __ ARJ-RL7
-40C to +85C
3k
SOT-23-5
N01
ADM6318 _ _ __ ARJ-RL7
-40C to +85C
3k
SOT-23-5
N02
ADM6319 _ __ ARJ-RL7
-40C to +85C
3k
SOT-23-5
N03
ADM6320 _ _ __ ARJ-RL7
-40C to +85C
3k
SOT-23-5
N04
ADM6321 _ _ __ ARJ-RL7
-40C to +85C
3k
SOT-23-5
N05
ADM6322 _ __ ARJ-RL7
-40C to +85C
3k
SOT-23-5
N06
2004 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
A: -40C to +85C
PRELIMINARY TECHNICAL DATA
PR04533-0-6/04(PrC)
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