AD ADM8616

Low-Voltage Manual Reset & Watchdog
Supervisory Circuits in 4-Lead SC70
ADM8611/ADM8616/ADM8617/ADM8618
Preliminary Technical Data
FUNCTIONAL BLOCK DIAGRAMS
FEATURES
Precision 1.8V to 5V Power Supply Monitoring
9 Reset Threshold Options:
1.58V to 4.63V
140ms (Min) Reset Timeout
Manual Reset Input (ADM8611)
Watchdog Timer (ADM8616–ADM8618)
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 -40°C to +85°C Temperature Range
4-Lead SC70 Package
VCC
ADM8616
VCC
RESET
GENERATOR
VREF
RESET
WATCHDOG
DETECTOR
GND
WDI
APPLICATIONS
Figure 1.
Microprocessor Systems
Computers
Controllers
Intelligent Instruments
Portable Equipment
GENERAL DESCRIPTION
Each part is available in a choice of the following 9 reset
threshold options: 1.58V, 1.67V, 2.19V, 2.32V, 2.63V, 2.93V,
3.08V, 4.38V and 4.63V. The reset timeout periods are 20ms
(min) and 140ms (min) for the ADM8611 and ADM8616–
ADM8618, respectively. The watchdog timeout period is 1.6s
(typ). The parts differ in terms of reset output configuration, as
indicated in table 1.
The ADM8611/ADM8616/ADM8617/ADM8618 are
supervisory circuits which monitor power supply voltage levels
and code execution integrity in microprocessor-based systems.
A power-on-reset signal is generated when the supply voltage
rises to a preset threshold level. The ADM8611’s debounced
manual reset input can be used to initiate a reset by means of an
external push-button or logic signal. The ADM8616–ADM8618
have an on-chip watchdog timer which can reset the
microprocessor if it fails to strobe within a preset timeout
period.
The ADM8611/ADM8616/ADM8617/ADM8618 are available
in 4-lead SC70 packages and typically consume only 3µA,
making them suitable for use in low power portable
applications.
Table 1. Selection Table
Part No.
Manual Reset
Watchdog
ADM8611
ADM8616
ADM8617
ADM8618
Yes
-
Yes
Yes
Yes
Output Stage
RESET
RESET
Push-Pull
Push-Pull
Open-Drain
Push-Pull
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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
www.analog.com
Tel: 781.329.4700
Fax: 781.326.8703
© 2004 Analog Devices, Inc. All rights reserved.
ADM8611/ADM8616/ADM8617/ADM8618
Preliminary Technical Data
ADM8611/ADM8616/ADM8617/ADM8618—SPECIFICATIONS
Table 2. VCC=Full Operating Range, TA=TMIN to TMAX, unless otherwise noted
Parameter
SUPPLY
VCC Operating Voltage Range
Supply Current
Typ
Max
Units
10
5
5.5
20
12
V
µA
µA
4.50
4.63
4.75
V
TA=-40°C to +85°C
ADM861_M
4.25
4.38
4.50
V
TA=-40°C to +85°C
ADM861_T
3.00
3.08
3.15
V
TA=-40°C to +85°C
ADM861_S
2.85
2.93
3.00
V
TA=-40°C to +85°C
ADM861_R
2.55
2.63
2.70
V
TA=-40°C to +85°C
ADM861_Z
2.25
2.32
2.38
V
TA=-40°C to +85°C
ADM861_Y
2.12
2.19
2.25
V
TA=-40°C to +85°C
ADM861_W
1.62
1.67
1.71
V
TA=-40°C to +85°C
1.52
1.58
40
3
30
200
40
1.62
V
ppm/°C
mV
ms
ms
µs
TA=-40°C to +85°C
RESET THRESHOLD VOLTAGE
ADM861_L
ADM861_V
RESET THRESHOLD TEMPERATURE COEFFICIENT
RESET THRESHOLD HYSTERESIS
RESET TIMEOUT PERIOD
Min
1
20
140
VCC TO RESET DELAY
PUSH-PULL OUTPUT (ADM8611, ADM8616, ADM8618)
RESET Output Voltage
40
280
0.3
0.3
0.3
0.4
0.8x VCC
VCC-1.5
5
RESET Rise Time
RESET Output Voltage
25
0.3
0.4
V
V
V
V
0.3
0.3
0.3
0.4
1
V
V
V
V
µA
0.8x VCC
0.8x VCC
VCC-1.5
OPEN-DRAIN OUTPUT (ADM8617)
RESET Output Voltage
Open-Drain Reset Output Leakage Current
Rev. PrB | Page 2 of 7
V
V
V
V
V
V
ns
Test Conditions/Comments
VCC=5.5V
VCC=3.6V
ADM8611
ADM8616–ADM8618
VCC falling at 1mV/µs
VCC>=1.0V, ISINK=50µA
VCC>=1.2V, ISINK=100µA
VCC>=2.7V, ISINK=1.2mA
VCC>=4.5V, ISINK=3.2mA
VCC>=2.7V, ISOURCE=500µA
VCC>=4.5V, I SOURCE=800µA
From 10% to 90% VCC, CL=5pF,
VCC =3.3V
VCC>=2.7V, ISINK=1.2mA
VCC>=4.5V, ISINK=3.2mA
VCC>=1.8V, ISOURCE=150µA
VCC>=2.7V, ISOURCE=500µA
VCC>=4.5V, I SOURCE=800µA
VCC>=1.0V, ISINK=50µA
VCC>=1.2V, ISINK=100µA
VCC>=2.7V, ISINK=1.2mA
VCC>=4.5V, ISINK=3.2mA
Preliminary Technical Data
ADM8611/ADM8616/ADM8617/ADM8618
Parameter
MANUAL RESET INPUT (ADM8611)
MR Input Threshold
Min
Typ
Max
Units
0.3xVCC
100
50
200
V
V
µs
ns
75
k⍀
ns
6.3
102
1.6
25.6
9.3
153
2.4
38.4
ms
ms
s
s
ns
V
V
µA
µA
0.7xVCC
1
MR Input Pulse Width
MR Glitch Rejection
MR Pull-up Resistance
MR to Reset Delay
25
WATCHDOG INPUT (ADM8616, ADM8617, ADM8618)
Watchdog Timeout Period
WDI Pulse Width
WDI Input Threshold
4.3
71
1.12
17.9
50
0.3xVCC
WDI Input Current
-20
120
-15
0.7xVCC
160
Test Conditions/Comments
ADM86___W
ADM86___X
ADM86___Y
ADM86___Z
VIL=0.3xVCC, VIH=0.7xVCC,
VWDI= VCC, time average
VWDI=0, time average
ABSOLUTE MAXIMUM RATINGS
Table 3. TA = 25°C unless otherwise noted.
Parameter
VCC
RESET/RESET
Output Current (RESET, RESET)
Operating Temperature Range
Storage Temperature Range
θJA Thermal Impedance, SC70
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 +150°C
146°C/W
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.
300°C
215°C
220°C
Rev. PrB | Page 3 of 7
ADM8611/ADM8616/ADM8617/ADM8618
Preliminary Technical Data
PIN CONFIGURATIONS AND FUNCTIONAL DESCRIPTIONS
RESET/RESET
4
1
VCC
ADM861x
TOP VIEW
( Not t o Scale)
MR/WDI
2
3 GND
Table 4. Pin Functional Descriptions
Pin No.
1
Name
RESET (ADM8616/ADM8617)
2
RESET (ADM8618)
MR (ADM8611)
WDI
(ADM8616/ADM8617/ADM8618)
3
4
GND
VCC
Description
Active-Low Reset Output, which is asserted whenever VCC is below the reset.threshold, VTH.
Push-Pull Output Stage for ADM8616.
Open-Drain Output Stage for ADM8617.
Active-High, Push-Pull Reset Output.
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.
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.
Ground
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 7
Preliminary Technical Data
ADM8611/ADM8616/ADM8617/ADM8618
OUTLINE DIMENSIONS
2.20
1.80
1.35
1.15
4
1
3
2.40
1.80
2
PIN 1
0.65 BSC
1.00
0.80
0.50 BSC
1.10
0.80
0.18
0.10
0.10 MAX
0.30
0.15
SEATING
0.70 PLANE
0.50
0.10 COPLANARITY
PACKAGE OUTLINE CORRESPONDS IN FULL TO EIAJ SC82
EXCEPT FOR WIDTH OF PIN-2 AS SHOWN
Figure 2. 4-Lead Plastic Surface Mount Package [SC70]
(KS-4)
Dimensions shown in millimeters
Rev. PrA | Page 5 of 7
0.30
0.10
ADM8611/ADM8616/ADM8617/ADM8618
Preliminary Technical Data
ORDERING GUIDE (ADM8611/ADM8616)
Model1
ADM8611LABKS-RL
ADM8611LABKS-RL7
ADM8611MABKS-RL
ADM8611MABKS-RL7
ADM8611TABKS-RL
ADM8611TABKS-RL7
ADM8611SABKS-RL
ADM8611SABKS-RL7
ADM8611RABKS-RL
ADM8611RABKS-RL7
ADM8611ZABKS-RL
ADM8611ZABKS-RL7
ADM8611YABKS-RL
ADM8611YABKS-RL7
ADM8611WABKS-RL
ADM8611WABKS-RL7
ADM8611VABKS-RL
ADM8611VABKS-RL7
ADM8616LAKS-RL
ADM8616LAKS-RL7
ADM8616MAKS-RL
ADM8616MAKS-RL7
ADM8616TAKS-RL
ADM8616TAKS-RL7
ADM8616SAKS-RL
ADM8616SAKS-RL7
ADM8616RAKS-RL
ADM8616RAKS-RL7
ADM8616ZAKS-RL
ADM8616ZAKS-RL7
ADM8616YAKS-RL
ADM8616YAKS-RL7
ADM8616WAKS-RL
ADM8616WAKS-RL7
ADM8616VAKS-RL
ADM8616VAKS-RL7
Reset Threshold (V)
4.63
4.63
4.38
4.38
3.08
3.08
2.93
2.93
2.63
2.63
2.32
2.32
2.19
2.19
1.67
1.67
1.58
1.58
4.63
4.63
4.38
4.38
3.08
3.08
2.93
2.93
2.63
2.63
2.32
2.32
2.19
2.19
1.67
1.67
1.58
1.58
Temperature Range
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
Rev. PrB | Page 6 of 7
Quantity
10k
3k
10k
3k
10k
3k
10k
3k
10k
3k
10k
3k
10k
3k
10k
3k
10k
3k
10k
3k
10k
3k
10k
3k
10k
3k
10k
3k
10k
3k
10k
3k
10k
3k
10k
3k
Package Type
SC70-4
SC70-4
SC70-4
SC70-4
SC70-4
SC70-4
SC70-4
SC70-4
SC70-4
SC70-4
SC70-4
SC70-4
SC70-4
SC70-4
SC70-4
SC70-4
SC70-4
SC70-4
SC70-4
SC70-4
SC70-4
SC70-4
SC70-4
SC70-4
SC70-4
SC70-4
SC70-4
SC70-4
SC70-4
SC70-4
SC70-4
SC70-4
SC70-4
SC70-4
SC70-4
SC70-4
Branding
N0F
N0F
N0F
N0F
N0F
N0F
N0F
N0F
N0F
N0F
N0F
N0F
N0F
N0F
N0F
N0F
N0F
N0F
N0G
N0G
N0G
N0G
N0G
N0G
N0G
N0G
N0G
N0G
N0G
N0G
N0G
N0G
N0G
N0G
N0G
N0G
Preliminary Technical Data
ADM8611/ADM8616/ADM8617/ADM8618
ORDERING GUIDE (ADM8617/ADM8618)
Model
ADM8617LACYKS-RL
ADM8617LACYKS-RL7
ADM8617MACYKS-RL
ADM8617MACYKS-RL7
ADM8617TACYKS-RL
ADM8617TACYKS-RL7
ADM8617SACYKS-RL
ADM8617SACYKS-RL7
ADM8617RACYKS-RL
ADM8617RACYKS-RL7
ADM8617ZACYKS-RL
ADM8617ZACYKS-RL7
ADM8617YACYKS-RL
ADM8617YACYKS-RL7
ADM8617WACYKS-RL
ADM8617WACYKS-RL7
ADM8617VACYKS-RL
ADM8617VACYKS-RL7
ADM8618LACYKS-RL
ADM8618LACYKS-RL7
ADM8618MACYKS-RL
ADM8618MACYKS-RL7
ADM8618TACYKS-RL
ADM8618TACYKS-RL7
ADM8618SACYKS-RL
ADM8618SACYKS-RL7
ADM8618RACYKS-RL
ADM8618RACYKS-RL7
ADM8618ZACYKS-RL
ADM8618ZACYKS-RL7
ADM8618YACYKS-RL
ADM8618YACYKS-RL7
ADM8618WACYKS-RL
ADM8618WACYKS-RL7
ADM8618VACYKS-RL
ADM8618VACYKS-RL7
1
Reset Threshold (V)
4.63
4.63
4.38
4.38
3.08
3.08
2.93
2.93
2.63
2.63
2.32
2.32
2.19
2.19
1.67
1.67
1.58
1.58
4.63
4.63
4.38
4.38
3.08
3.08
2.93
2.93
2.63
2.63
2.32
2.32
2.19
2.19
1.67
1.67
1.58
1.58
Temperature Range
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
Entries in bold type are standard models. Contact factory for availability of non-standard models.
© 2004 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective companies.
Printed in the U.S.A.
PR04795-0-3/04(PrA)
Rev. PrA | Page 7 of 7
Quantity
10k
3k
10k
3k
10k
3k
10k
3k
10k
3k
10k
3k
10k
3k
10k
3k
10k
3k
10k
3k
10k
3k
10k
3k
10k
3k
10k
3k
10k
3k
10k
3k
10k
3k
10k
3k
Package Type
SC70-4
SC70-4
SC70-4
SC70-4
SC70-4
SC70-4
SC70-4
SC70-4
SC70-4
SC70-4
SC70-4
SC70-4
SC70-4
SC70-4
SC70-4
SC70-4
SC70-4
SC70-4
SC70-4
SC70-4
SC70-4
SC70-4
SC70-4
SC70-4
SC70-4
SC70-4
SC70-4
SC70-4
SC70-4
SC70-4
SC70-4
SC70-4
SC70-4
SC70-4
SC70-4
SC70-4
Branding
N0H
N0H
N0H
N0H
N0H
N0H
N0H
N0H
N0H
N0H
N0H
N0H
N0H
N0H
N0H
N0H
N0H
N0H
N0J
N0J
N0J
N0J
N0J
N0J
N0J
N0J
N0J
N0J
N0J
N0J
N0J
N0J
N0J
N0J
N0J
N0J