Preliminary Technical Data
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 V
CC
=1V
Power Supply Glitch Immunity
Specified Over -40°C to +85°C Temperature Range
4-Lead SC70 Package
Low-Voltage Manual Reset & Watchdog
Supervisory Circuits in 4-Lead SC70
ADM8611/ADM8616/ADM8617/ADM8618
FUNCTIONAL BLOCK DIAGRAMS
V
CC
ADM8616
V
CC
V
REF
RESET
GENERATOR
RESET
WATCHDOG
DETECTOR
GND
WDI
APPLICATIONS
Microprocessor Systems
Computers
Controllers
Intelligent Instruments
Portable Equipment
Figure 1.
GENERAL DESCRIPTION
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.
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 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.
ADM8611
ADM8616
ADM8617
ADM8618
Manual Reset
Yes
-
-
-
Watchdog
-
Yes
Yes
Yes
Output Stage
RESET
Push-Pull
Push-Pull
Open-Drain
Push-Pull
RESET
Rev. PrB
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Specifications subject to change without notice. No license is granted by implication
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Fax: 781.326.8703
© 2004 Analog Devices, Inc. All rights reserved.
ADM8611/ADM8616/ADM8617/ADM8618
ADM8611/ADM8616/ADM8617/ADM8618—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
ADM861_L
ADM861_M
ADM861_T
ADM861_S
ADM861_R
ADM861_Z
ADM861_Y
ADM861_W
ADM861_V
RESET THRESHOLD TEMPERATURE COEFFICIENT
RESET THRESHOLD HYSTERESIS
RESET TIMEOUT PERIOD
V
CC
TO RESET DELAY
PUSH-PULL OUTPUT (ADM8611, ADM8616, ADM8618)
RESET Output Voltage
Min
1
10
5
4.50
4.25
3.00
2.85
2.55
2.25
2.12
1.62
1.52
4.63
4.38
3.08
2.93
2.63
2.32
2.19
1.67
1.58
40
3
30
200
40
Typ
Max
5.5
20
12
4.75
4.50
3.15
3.00
2.70
2.38
2.25
1.71
1.62
Preliminary Technical Data
Units
V
µA
µA
V
V
V
V
V
V
V
V
V
ppm/°C
mV
ms
ms
µs
V
V
V
V
V
V
ns
V
V
V
V
Test Conditions/Comments
V
CC
=5.5V
V
CC
=3.6V
T
A
=-40°C to +85°C
T
A
=-40°C to +85°C
T
A
=-40°C to +85°C
T
A
=-40°C to +85°C
T
A
=-40°C to +85°C
T
A
=-40°C to +85°C
T
A
=-40°C to +85°C
T
A
=-40°C to +85°C
T
A
=-40°C to +85°C
20
140
40
280
ADM8611
ADM8616–ADM8618
V
CC
falling at 1mV/µs
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
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
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 (ADM8617)
RESET Output Voltage
5
25
0.3
0.4
Open-Drain Reset Output Leakage Current
0.3
0.3
0.3
0.4
1
V
V
V
V
µA
Rev. PrB | Page 2 of 7
Preliminary Technical Data
Parameter
MANUAL RESET INPUT (ADM8611)
MR Input Threshold
MR Input Pulse Width
MR Glitch Rejection
MR Pull-up Resistance
MR to Reset Delay
WATCHDOG INPUT (ADM8616, ADM8617, ADM8618)
Watchdog Timeout Period
Min
Typ
ADM8611/ADM8616/ADM8617/ADM8618
Max
0.3xV
CC
0.7xV
CC
1
25
100
50
200
6.3
102
1.6
25.6
75
Units
V
V
µs
ns
k
ns
ms
ms
s
s
ns
V
V
µA
µA
ADM86___W
ADM86___X
ADM86___Y
ADM86___Z
V
IL
=0.3xV
CC
, V
IH
=0.7xV
CC
,
Test Conditions/Comments
WDI Pulse Width
WDI Input Threshold
WDI Input Current
4.3
71
1.12
17.9
50
0.3xV
CC
9.3
153
2.4
38.4
-20
120
-15
0.7xV
CC
160
V
WDI
= V
CC
, time average
V
WDI
=0, time average
ABSOLUTE MAXIMUM RATINGS
Table 3. T
A
= 25°C unless otherwise noted.
Parameter
V
CC
RESET/RESET
Output Current (RESET, RESET)
Operating Temperature Range
Storage Temperature Range
θ
JA
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
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 7
ADM8611/ADM8616/ADM8617/ADM8618
PIN CONFIGURATIONS AND FUNCTIONAL DESCRIPTIONS
RESET/RESET
1
4
Preliminary Technical Data
V
CC
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
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 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
OUTLINE DIMENSIONS
1.35
1.15
4
ADM8611/ADM8616/ADM8617/ADM8618
2.20
1.80
3
2.40
1.80
1
2
PIN 1
0.65 BSC
1.00
0.80
0.50 BSC
1.10
0.80
0.18
0.10
0.30
0.10
0.10 MAX
0.30
0.15
SEATING
0.70 PLANE
0.50
0.10 COPLANARITY
P
ACKAGE 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
Embedded System
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