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ADM8616YCYAKSZ-RL7

P1-P3P4-P6P7-P9P10-P12
Low Voltage Supervisory Circuits
with Watchdog in 4-Lead SC70
ADM8616/ADM8617
Rev. B
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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.
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One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 www.analog.com
Fax: 781.461.3113 ©2007 Analog Devices, Inc. All rights reserved.
FEATURES
Precision 1.8 V to 5 V power supply monitoring
9
RESET
threshold options
1.58 V to 4.63 V
4
RESET
timeout options
1 ms, 20 ms, 140 ms, 1120 ms
3 watchdog timeout options
6.3 ms, 102 ms, 1.6 sec
RESET
output stages
Push-pull active-low (ADM8616)
Open-drain active-low (ADM8617)
Low power consumption (5 μA)
Guaranteed reset output valid to V
CC
= 1 V
Power supply glitch immunity
Specified over −40°C to +85°C temperature range
4-lead SC70 package
APPLICATIONS
Microprocessor systems
Computers
Controllers
Intelligent instruments
Portable equipment
FUNCTIONAL BLOCK DIAGRAM
ADM8616
V
CC
V
CC
GND WDI
RESET
RESET
GENERATOR
WATCHDOG
DETECTOR
V
REF
0
4795-001
Figure 1.
GENERAL DESCRIPTION
The ADM8616/ADM8617 are supervisory circuits that 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 ADM8616/ADM8617 have an on-chip watchdog
timer that can reset the microprocessor if it fails to strobe
within a preset timeout period.
Each part is available in the following nine reset threshold
options: 1.58 V, 1.67 V, 2.19 V, 2.32 V, 2.63 V, 2.93 V, 3.08 V,
4.38 V, and 4.63 V. There are four reset timeout options: 1 ms,
20 ms, 140 ms, and 1120 ms. There are also three possible
watchdog timeouts available: 6.3 ms, 102 ms, and 1.6 sec.
The parts differ in terms of reset output configuration. The
ADM8616 is active-low with a push-pull output, while the
ADM8617 is active-low with an open-drain output.
The ADM8616/ADM8617 are available in 4-lead SC70 packages
and typically consume only 5 μA, making them suitable for use
in low power, portable applications.
ADM8616/ADM8617
Rev. B | Page 2 of 12
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
Functional Block Diagram .............................................................. 1
General Description......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 4
ESD Caution.................................................................................. 4
Pin Configuration and Function Descriptions............................. 5
Typical Performance Characteristics ............................................. 6
Circuit Description............................................................................8
RESET Output ...............................................................................8
Watchdog Input .............................................................................8
Application Information...................................................................9
Watchdog Input Current ..............................................................9
Negative-Going V
CC
Transients...................................................9
Ensuring RESET Valid to V
CC
= 0 V...........................................9
Watchdog Software Considerations............................................9
Outline Dimensions ....................................................................... 10
Ordering Guide .......................................................................... 10
REVISION HISTORY
1/07—Rev. A to Rev. B
Changes to Functional Block Diagram.......................................... 1
11/06—Rev. 0 to Rev. A
Changes to Ordering Guide .......................................................... 10
6/05—Revision 0: Initial Version
ADM8616/ADM8617
Rev. B | Page 3 of 12
SPECIFICATIONS
V
CC
= full operating range, T
A
= −40
o
C to +85
o
C, unless otherwise noted.
Table 1.
Parameter Min Typ Max Unit Test Conditions/Comments
SUPPLY
V
CC
Operating Voltage Range 1 5.5 V
Supply Current 10 20 μA V
CC
= 5.5 V
5 12 μA V
CC
= 3.6 V
RESET THRESHOLD VOLTAGE
ADM861xL
4.50 4.63 4.75 V
ADM861xM
4.25 4.38 4.50 V
ADM861xT
3.00 3.08 3.15 V
ADM861xS
2.85 2.93 3.00 V
ADM861xR
2.55 2.63 2.70 V
ADM861xZ
2.25 2.32 2.38 V
ADM861xY
2.12 2.19 2.25 V
ADM861xW
1.62 1.67 1.71 V
ADM861xV
1.52 1.58 1.62 V
RESET THRESHOLD TEMPERATURE COEFFICIENT
40 ppm/°C
RESET THRESHOLD HYSTERESIS
2 × V
TH
mV
RESET TIMEOUT PERIOD
ADM861xxA 1 1.4 2 ms
ADM861xxB 20 28 40 ms
ADM861xxC 140 200 280 ms
ADM861xxD 1120 1600 2240 ms
V
CC
TO RESET DELAY
40 μs V
CC
falling at 1 mV/μs
RESET OUTPUT VOLTAGE
VOL (Open-Drain and Push-Pull) 0.3 V V
CC
≥ 1.0 V, I
SINK
= 50 μA
0.3 V V
CC
≥ 1.2 V, I
SINK
= 100 μA
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
VOH (Push-Pull Only) 0.8 × V
CC
V V
CC
≥ 2.7 V, I
SOURCE
= 500 μA
V
CC
− 1.5
V V
CC
≥ 4.5 V, I
SOURCE
= 800 μA
RESET Rise Time
5 25 ns From 10% to 90% V
CC
, C
L
= 5 pF, V
CC
= 3.3 V
Open-Drain RESET Output Leakage Current
1 μA
WATCHDOG INPUT
Watchdog Timeout Period
ADM861xxxW 4.3 6.3 9.3 ms
ADM861xxxX 71 102 153 ms
ADM861xxxY 1.12 1.6 2.4 sec
WDI Pulse Width 50 ns V
IL
= 0.3 × V
CC
, V
IH
= 0.7 × V
CC
WDI Input Threshold V
VIL 0.3 × V
CC
VIH 0.7 × V
CC
V
WDI Input Current 120 160 μA V
WDI
= V
CC
−20 −15
μA V
WDI
= 0
P1-P3P4-P6P7-P9P10-P12

ADM8616YCYAKSZ-RL7

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Description:
Supervisory Circuits Watchdog Supervisor - IC.
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