Preliminary Technical Data
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 V
CC
=1V
Power Supply Glitch Immunity
Specified Over Industrial Temperature Range
5-Lead SOT-23 Package
Supervisory Circuits with Watchdog
and Manual Reset in 5-Lead SOT-23
ADM6316–ADM6322
FUNCTIONAL BLOCK DIAGRAM
V
CC
ADM6316
V
CC
V
REF
RESET
GENERATOR
RESET
MR
DEBOUNCE
WATCHDOG
DETECTOR
GND
WDI
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.
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
Part No.
ADM6316
ADM6317
ADM6318
ADM6319
ADM6320
ADM6321
ADM6322
Rev. PrB
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 companies.
Watchdog
Yes
Yes
Yes
-
Yes
Yes
-
Manual Reset
Yes
Yes
-
Yes
Yes
-
Yes
Output Stage
RESET
Push-Pull
-
Push-Pull
Push-Pull
Open-Drain
Open-Drain
Open-Drain
RESET
-
Push-Pull
Push-Pull
Push-Pull
-
Push-Pull
Push-Pull
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www.analog.com
Tel: 781.329.4700
Fax: 781.326.8703
© 2004 Analog Devices, Inc. All rights reserved.
ADM6316–ADM6322
ADM6316-ADM6322—SPECIFICATIONS
Table 2. V
CC
=Full Operating Range, T
A
=T
MIN
to T
MAX
, unless otherwise noted
Parameter
SUPPLY
V
CC
Operating Voltage Range
Supply Current
RESET THRESHOLD VOLTAGE
V
TH
-1.5%
V
TH
-2.5%
RESET THRESHOLD TEMPERATURE COEFFICIENT
RESET THRESHOLD HYSTERESIS
RESET TIMEOUT PERIOD
ADM63__A
ADM63__B
ADM63__C
ADM63__D
V
CC
TO RESET DELAY
PUSH-PULL OUTPUT (ADM6316, ADM6317, ADM6318,
ADM6319, ADM6321, ADM6322)
RESET Output Voltage
V
TH
V
TH
40
3
1.4
28
200
1600
40
V
TH
+1.5%
V
TH
+2.5%
Min
1
10
5
Typ
Max
5.5
20
12
Preliminary Technical Data
Units
V
µA
µA
V
V
ppm/°C
mV
ms
ms
ms
ms
µs
Test Conditions/Comments
V
CC
=5.5V
V
CC
=3.6V
T
A
=+25°C
T
A
=-40°C to +85°C
1
20
140
1120
2
40
280
2240
V
CC
falling at 1mV/µs
0.3
0.3
0.3
0.4
0.8x V
CC
V
CC
-1.5
RESET Rise Time
RESET Output Voltage
0.8x V
CC
0.8x V
CC
V
CC
-1.5
OPEN-DRAIN OUTPUT (ADM6320, ADM6321,
ADM6322)
RESET Output Voltage
5
25
0.3
0.4
V
V
V
V
V
V
ns
V
V
V
V
V
CC
>=1.0V, I
SINK
=50µA
V
CC
>=1.2V, I
SINK
=100µA
V
CC
>=2.7V, I
SINK
=1.2mA
V
CC
>=4.5V, I
SINK
=3.2mA
V
CC
>=2.7V, I
SOURCE
=500µA
V
CC
>=4.5V, I
SOURCE
=800µA
From 10% to 90% V
CC
, C
L
=5pF,
V
CC
=3.3V
V
CC
>=2.7V, I
SINK
=1.2mA
V
CC
>=4.5V, I
SINK
=3.2mA
V
CC
>=1.8V, I
SOURCE
=150µA
V
CC
>=2.7V, I
SOURCE
=500µA
V
CC
>=4.5V, I
SOURCE
=800µA
Open-Drain Reset Output Leakage Current
WATCHDOG INPUT (ADM6316, ADM6317, ADM6318,
ADM6320, ADM6321)
Watchdog Timeout Period
0.3
0.3
0.3
0.4
1
V
V
V
V
µA
V
CC
>=1.0V, I
SINK
=50µA
V
CC
>=1.2V, I
SINK
=100µA
V
CC
>=2.7V, I
SINK
=1.2mA
V
CC
>=4.5V, I
SINK
=3.2mA
WDI Pulse Width
WDI Input Threshold
WDI Input Current
4.3
71
1.12
17.9
50
0.3xV
CC
6.3
102
1.6
25.6
9.3
153
2.4
38.4
ms
ms
s
s
ns
V
V
µA
µA
ADM63___W
ADM63___X
ADM63___Y
ADM63___Z
V
IL
=0.3xV
CC
, V
IH
=0.7xV
CC
,
-20
120
-15
0.7xV
CC
160
V
WDI
= V
CC
, time average
V
WDI
=0, time average
Rev.PrB | Page 2 of 8
Preliminary Technical Data
Parameter
MANUAL RESET INPUT (ADM6316, ADM6317,
ADM6319, ADM6320, ADM6322)
MR Input Threshold
Min
Typ
Max
Units
ADM6316–ADM6322
Test Conditions/Comments
0.8
2.0
0.3xV
CC
0.7xV
CC
MR Input Pulse Width
MR Glitch Rejection
MR Pull-up Resistance
MR to Reset Delay
1
35
100
52
230
75
V
V
V
V
µs
ns
k
ns
V
TH
>4.0V
V
TH
>4.0V
V
TH
<4.0V
V
TH
<4.0V
V
CC
=5V
ABSOLUTE MAXIMUM RATINGS
Table 3. T
A
= 25°C unless otherwise noted.
Parameter
V
CC
RESET (ADM6320, ADM6321, ADM6322)
Output Current (RESET, RESET)
Operating Temperature Range
Storage Temperature Range
θ
JA
Thermal Impedance, SOT-23
Lead Temperature
Soldering (10 sec)
Vapour Phase (60 sec)
Infrared (15 sec)
Rating
-0.3V to +6V
-0.3V to +6V
20mA
-40°C to +85°C
-65°C to +125°C
270°C/W
300°C
215°C
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.
Rev.PrB | Page 3 of 8
ADM6316–ADM6322
PIN CONFIGURATIONS AND FUNCTIONAL DESCRIPTIONS
RESET
GND
MR
1
2
3
5
V
CC
RESET 1
GND
4
WDI
MR
2
3
ADM6317
(Not to Scale)
Preliminary Technical Data
ADM6316/
ADM6320
(Not to Scale)
5
V
CC
TOP VIEW
TOP VIEW
4
WDI
RESET
GND
RESET
1
2
3
ADM6318/
ADM6321
(Not to Scale)
5
V
CC
RESET
GND
1
2
3
ADM6319/
ADM6322
(Not to Scale)
5
V
CC
TOP VIEW
TOP VIEW
4
WDI
RESET
4
MR
Table 4. Pin Functional Descriptions
Pin No.
1
Name
RESET (ADM6316/18/19/20/21/22)
2
3
RESET (ADM6317)
GND
MR (ADM6316/17/20)
4
RESET (ADM6318/19/21/22)
WDI (ADM6316/17/18/20/21)
MR (ADM6319/22)
5
V
CC
Description
Active-Low Reset Output, which is asserted whenever V
CC
is below the reset.threshold, V
TH
.
Push-Pull Output Stage for ADM6316/18/19.
Open-Drain Output Stage for ADM6320/21/22.
Active-High, Push-Pull Reset Output.
Ground
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.
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 floating to disable the watchdog timer.
Manual Reset Input.
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.
`
Rev.PrB | Page 4 of 8
Preliminary Technical Data
TYPICAL PERFORMANCE CHARACTERISTICS
ADM6316–ADM6322
Figure 1. Supply Current vs. Temperature
(ADM6316/ADM6317/ADM6318/ADM6320/ADM6321)
Figure 4. Normalized Reset Timeout Period vs. Temperature
Figure 2. V
CC
Falling to Reset Propagation Delay vs. Temperature
Figure 5. Normalized Watchdog Timeout Period vs. Temperature
(ADM6316/ADM6317/ADM6318/ADM6320/ADM6321)
Figure 3. Manual Reset to Reset Propagation Delay vs. Temperature
(ADM6316/ADM6317/ADM6319/ADM6320/ADM6322)
Figure 6. Maximum V
CC
Transient Duration vs. Reset Threshold Overdrive
Rev.PrB | Page 5 of 8
PCB Design
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