AD ADM824 Supervisory circuits with watchdog and manual reset in 5-lead sc70 and sot-23 Datasheet

Preliminary Technical Data
Supervisory Circuits with Watchdog and
Manual Reset in 5-Lead SC70 and SOT-23
ADM823/ADM824/ADM825
FEATURES
FUNCTIONAL BLOCK DIAGRAM
Precision 2.5 V to 5 V power supply monitor
7 reset threshold options: 2.19 V to 4.63 V
140 ms (min) reset timeout
Watchdog timer with 1.6s timeout (ADM823, ADM824)
Manual reset input (ADM823, ADM825)
Push-pull output stages:
RESET (ADM823)
RESET, RESET (ADM824/ADM825)
Low power consumption (3 µA)
Guaranteed reset output valid to VCC = 1 V
Power supply glitch immunity
Specified over automotive temperature range
5-lead SC70 and SOT-23 packages
ADM823
VCC
VCC
RESET
GENERATOR
VREF
MR
RESET
DEBOUNCE
GND
04534-0-001
WATCHDOG
DETECTOR
WDI
Figure 1.
APPLICATIONS
Microprocessor systems
Computers
Controllers
Intelligent instruments
Portable equipment
GENERAL DESCRIPTION
The ADM823/ADM824/ADM825 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 three
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 seven reset threshold
options ranging from 2.19 V to 4.63 V. The reset and watchdog
timeout periods are fixed at 140 ms (min) and 1.6s (typ),
respectively.
The ADM823/ADM824/ADM825 are available in 5-lead SC70
and SOT-23 packages and typically consume only 3 µA, making
them suitable for use in low power portable applications.
Table 1. Selection Table
Output Stage
Part No.
ADM823
ADM824
ADM825
Watchdog Timer
Yes
Yes
–
Manual Reset
Yes
–
Yes
RESET
RESET
Push-Pull
Push-Pull
Push-Pull
–
Push-Pull
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 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.
ADM823/ADM824/ADM825
Preliminary Technical Data
TABLE OF CONTENTS
Specifications..................................................................................... 3
Typical Performance Characteristics ..............................................7
Absolute Maximum Ratings............................................................ 5
OUTLINE DIMENSIONS ...............................................................9
ESD Caution.................................................................................. 5
Ordering Guides......................................................................... 10
Pin Configurations and Function Descriptions ........................... 6
Rev.PrB | Page 2 of 10
Preliminary Technical Data
ADM823/ADM824/ADM825
SPECIFICATIONS
VCC = 4.75 V to 5.5 V for ADM82_L, VCC = 4.5 V to 5.5 V for ADM82_M, VCC = 3.15 V to 3.6 V for ADM82_T,
VCC = 3 V to 3.6 V for ADM82_S, VCC = 2.7 V to 3.6 V for ADM82_R, VCC = 2.38 V to 2.75 V for ADM82_Z,
VCC = 2.25 V to 2.75 V for ADM82_Y, TA = TMIN to TMAX, unless otherwise noted
Table 2.
Parameter
SUPPLY
VCC Operating Voltage Range
Min
1
1.2
Supply Current
RESET THRESHOLD VOLTAGE
ADM82_L
ADM82_M
ADM82_T
ADM82_S
ADM82_R
ADM82_Z (SC70 only)
ADM82_Y (SC70 only)
4.56
4.50
4.31
4.25
3.04
3.00
2.89
2.85
2.59
2.55
2.28
2.25
2.16
2.13
RESET THRESHOLD TEMPERATURE COEFFICIENT
RESET THRESHOLD HYSTERESIS
RESET TIMEOUT PERIOD
VCC TO RESET DELAY
RESET Output Voltage
Typ
140
Max
Unit
Test Conditions/Comments
5.5
TA = 0°C to +70°C
TA = TMIN to TMAX
WDI and MR unconnected
ADM82_L/M
WDI and MR unconnected
ADM82_T/S/R/Z/Y
10
24
V
V
µA
5
12
µA
4.63
4.70
4.75
4.45
4.50
3.11
3.15
2.96
3.00
2.66
2.70
2.35
2.38
2.22
2.25
0.4
V
V
V
V
V
V
V
V
V
V
V
V
V
V
ppm/°C
mV
mV
ms
µs
V
0.3
V
0.3
V
4.38
3.08
2.93
2.63
2.32
2.19
40
10
5
200
40
280
VCC − 1.5
V
0.8 × VCC
V
RESET Output Short Circuit Current
RESET Output Voltage
0.8 × VCC
Rev.PrB | Page 3 of 10
800
µA
400
µA
0.4
V
0.3
V
V
TA = 25°C
TA = TMIN to TMAX
TA = 25°C
TA = TMIN to TMAX
TA = 25°C
TA = TMIN to TMAX
TA = 25°C
TA = TMIN to TMAX
TA = 25°C
TA = TMIN to TMAX
TA = 25°C
TA = TMIN to TMAX
TA = 25°C
TA = TMIN to TMAX
ADM82_L/M
ADM82_T/S/R/Z/Y
VTH – VCC = 100 mV
VCC = VTH min, ISINK = 3.2 mA,
ADM82_L/M
VCC = VTH min, ISINK = 1.2 mA,
ADM82_T/S/R/Z/Y
TA = 0°C to 70°C, VCC = 1 V,
VCC falling, ISINK = 50 µA
VCC = VTH max, ISOURCE = 120 µA,
ADM82_L/M
VCC = VTH max, ISOURCE = 30 µA,
ADM82_T/S/R/Z/Y
RESET = 0 V, VCC = 5.5 V,
ADM82_L/M
RESET = 0 V, VCC = 5.5 V,
ADM82_T/S/R/Z/Y
VCC = VTH max, ISINK = 3.2 mA,
ADM824L/M, ADM825L/M
VCC = VTH max, ISINK = 1.2 mA,
ADM824T/S/R/Z/Y,
ADM825T/S/R/Z/Y
VCC > = 1.8 V, ISOURCE = 150 µA
ADM823/ADM824/ADM825
Parameter
WATCHDOG INPUT (ADM823, ADM824)
Watchdog Timeout Period
WDI Pulse Width
WDI Input Threshold
VIL
VIH
WDI Input Current
Preliminary Technical Data
Min
Typ
Max
Unit
Test Conditions/Comments
1.12
50
1.6
2.40
s
ns
VIL = 0.4 V, VIH = 0.8 × V CC,
V
V
µA
µA
VWDI = VCC, time average
VWDI = 0, time average
0.3 × VCC
0.7 × VCC
−20
120
−15
MANUAL RESET INPUT (ADM823, ADM825)
MR Input Threshold
MR Input Pulse Width
MR Glitch Rejection
MR Pull-up Resistance
MR to Reset Delay
160
0.3 × VCC
V
V
µs
ns
75
k⍀
ns
0.7 × VCC
1
35
100
52
500
Rev.PrB | Page 4 of 10
Preliminary Technical Data
ADM823/ADM824/ADM825
ABSOLUTE MAXIMUM RATINGS
TA = 25°C, unless otherwise noted.
Table 3.
Parameter
VCC
Output Current (RESET, RESET)
Operating Temperature Range
Storage Temperature Range
θJA Thermal Impedance
SC70
SOT-23
Lead Temperature
Soldering (10 sec)
Vapor Phase (60 sec)
Infrared (15 sec)
Rating
–0.3 V to +6 V
20 mA
–40°C to +125°C
–65°C to +150°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.
146°C/W
270°C/W
300°C
215°C
220°C
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 5 of 10
ADM823/ADM824/ADM825
Preliminary Technical Data
PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS
RESET 1
VCC
GND 2
TOP VIEW
(Not to Scale)
MR 3
4
WDI
04534-0-002
GND 2
5
RESET 1
VCC
ADM824
Figure 2. ADM823 Pin Configuration
RESET 3
5
VCC
4
MR
ADM825
GND 2
TOP VIEW
(Not to Scale)
4
WDI
Figure 3. ADM824 Pin Configuration
RESET 3
TOP VIEW
(Not to Scale)
04534-0-004
5
ADM823
04534-0-003
RESET 1
Figure 4. ADM825 Pin Configuration
Table 4. Pin Function Descriptions
Pin. No.
1
2
3
Mnemonic
RESET
GND
MR (ADM823)
4
RESET (ADM824/ADM825)
WDI (ADM823/ADM824)
5
MR (ADM825)
VCC
Description
Push-Pull Active-Low Reset Output. Asserted whenever VCC is below the reset threshold, VTH.
Ground.
Manual Reset Input. This is an active-low input which, when forced low for at least 1µs, generates
a reset. It features a 52 k⍀ internal pull-up.
Active-High, Push-Pull Reset Output.
Watchdog Input. Generates a reset if the voltage 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.
Manual Reset Input.
Power Supply Voltage Being Monitored.
Rev.PrB | Page 6 of 10
Preliminary Technical Data
ADM823/ADM824/ADM825
TYPICAL PERFORMANCE CHARACTERISTICS
10.0
100
9.5
90
9.0
80
VCC TO RESET DELAY (µs)
8.5
ADM823L
7.0
6.5
6.0
ADM824Y
5.5
5.0
4.5
ADM825R
3.5
–40
–20
0
20
40
60
TEMPERATURE (°C)
80
100
120
30
20
–20
0
20
40
60
TEMPERATURE (°C)
80
100
120
340
65
60
55
50
45
40
35
30
25
20
0
0.5
1.0
1.5
2.0
2.5 3.0
VCC (V)
3.5
4.0
4.5
5.0
5.5
300
280
260
240
220
200
180
160
140
120
100
–40
04534-0-006
15
10
320
–20
0
20
40
60
TEMPERATURE (°C)
80
100
120
04534-0-009
MANUAL RESET TO RESET DELAY (ns)
75
70
ICC (µA)
40
0
–40
80
Figure 9. Manual Reset to Reset Propagation Delay vs. Temperature
(ADM823/ADM825)
Figure 6. Supply Current vs. Supply Voltage
1.05
250
1.04
240
1.03
230
RESET TIMEOUT
1.02
1.01
1.00
0.99
0.98
220
210
200
190
0.97
180
0.96
0.95
–40
–20
0
20
40
60
TEMPERATURE (°C)
80
100
120
04534-0-007
NORMALIZED RESET THRESHOLD
50
Figure 8. Reset Comparator Propagation Delay vs. Temperature (VCC Falling)
Figure 5. Supply Current vs. Temperature
5
0
60
10
04534-0-005
4.0
70
Figure 7. Normalized Reset Threshold vs. Temperature
170
–40
–20
0
20
40
60
TEMPERATURE (°C)
80
100
Figure 10. Reset Timeout Period vs. Temperature
Rev.PrB | Page 7 of 10
120
04534-0-010
ICC (µA)
7.5
04534-0-008
8.0
ADM823/ADM824/ADM825
Preliminary Technical Data
2.0
190
1.8
180
MR MINIMUM PULSE WIDTH (ns)
1.4
1.2
1.0
0.8
0.6
0.4
160
150
140
130
120
–40
–20
0
25
60
TEMPERATURE
85
04534-0-011
0
125
100
–50
Figure 11. Watchdog Timeout Period vs. Temperature
(ADM823/ADM824)
3.8
140
3.6
MINIMUM PULSE WIDTH (ns)
120
VTH = 4.9V
80
60
40
0
10
100
3.4
NEGATIVE PULSE
3.2
3.0
2.8
2.6
2.4
POSITIVE PULSE
2.2
VTH = 2.93V
100
OVER DRIVE VOD (mV)
1000
04534-0-012
20
50
TEMPERATURE (°C)
Figure 13. Manual Reset Minimum Pulse Width vs. Temperature
(ADM823/ADM825)
160
100
0
04534-0-013
110
0.2
MAXIMUM TRANSIENT DURATION (µs)
170
Figure 12. Maximum VCC Transient Duration vs. Reset Threshold Overdrive
Rev.PrB | Page 8 of 10
2.0
–40
10
60
TEMPERATURE (°C)
110
160
Figure 14. Watchdog Input Minimum Pulse Width vs. Temperature
(ADM823/ADM824)
04534-0-014
TIMEOUT PERIOD (s)
1.6
Preliminary Technical Data
ADM823/ADM824/ADM825
OUTLINE DIMENSIONS
2.00 BSC
5
4
1.25 BSC
2.10 BSC
1
2
3
PIN 1
0.65 BSC
1.00
0.90
0.70
1.10 MAX
0.22
0.08
0.30
0.15
0.10 MAX
0.46
0.36
0.26
8°
4°
0°
SEATING
PLANE
0.10 COPLANARITY
COMPLIANT TO JEDEC STANDARDS MO-203AA
Figure 15. 5-Lead Plastic Surface-Mount Package [SC-70]
(KS-5)
Dimensions shown in millimeters
2.90 BSC
5
4
2.80 BSC
1.60 BSC
1
2
3
PIN 1
0.95 BSC
1.90
BSC
1.30
1.15
0.90
1.45 MAX
0.15 MAX
0.50
0.30
0.22
0.08
SEATING
PLANE
10°
5°
0°
COMPLIANT TO JEDEC STANDARDS MO-178AA
Figure 16. 5-Lead Small Outline Transistor Package [SOT-23]
(RJ-5)
Dimensions shown in millimeters
Rev.PrB | Page 9 of 10
0.60
0.45
0.30
ADM823/ADM824/ADM825
Preliminary Technical Data
ORDERING GUIDES
Table 5. ADM823 Ordering Guide
Model
ADM823LYKS-R7
ADM823LYRT-R7
ADM823MYKS-R7
ADM823MYRT-R7
ADM823TYKS-R7
ADM823TYRT-R7
ADM823SYKS-R7
ADM823SYRT-R7
ADM823RYKS-R7
ADM823RYRT-R7
ADM823ZYKS-R7
ADM823YYKS-R7
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
2.19
Temperature Range
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
Quantity
3k
3k
3k
3k
3k
3k
3k
3k
3k
3k
3k
3k
Package Type
SC70-5
SOT-23-5
SC70-5
SOT-23-5
SC70-5
SOT-23-5
SC70-5
SOT-23-5
SC70-5
SOT-23-5
SC70-5
SC70-5
Branding
N07
N07
N07
N07
N07
N07
N07
N07
N07
N07
N07
N07
Temperature Range
–40°C to +85°C
–40°C to +125°C
–40°C to +85°C
–40°C to +125°C
–40°C to +85°C
–40°C to +125°C
–40°C to +85°C
–40°C to +125°C
–40°C to +85°C
–40°C to +125°C
–40°C to +85°C
–40°C to +85°C
Quantity
3k
3k
3k
3k
3k
3k
3k
3k
3k
3k
3k
3k
Package Type
SC70-5
SOT-23-5
SC70-5
SOT-23-5
SC70-5
SOT-23-5
SC70-5
SOT-23-5
SC70-5
SOT-23-5
SC70-5
SC70-5
Branding
N08
N08
N08
N08
N08
N08
N08
N08
N08
N08
N08
N08
Package Type
SC70-5
SOT-23-5
SC70-5
SOT-23-5
SC70-5
SOT-23-5
SC70-5
SOT-23-5
SC70-5
SOT-23-5
SC70-5
SC70-5
Branding
N09
N09
N09
N09
N09
N09
N09
N09
N09
N09
N09
N09
Table 6. ADM824 Ordering Guide
Model1
ADM824LYKS-R7
ADM824LYRT-R7
ADM824MYKS-R7
ADM824MYRT-R7
ADM824TYKS-R7
ADM824TYRT-R7
ADM824SYKS-R7
ADM824SYRT-R7
ADM824RYKS-R7
ADM824RYRT-R7
ADM824ZYKS-R7
ADM824YYKS-R7
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
2.19
All of the ADM824 models are nonstandard. Contact factory for availability of nonstandard models.
Table 7. ADM825 Ordering Guide
Model1
ADM825LYKS-R7
ADM825LYRT-R7
ADM825MYKS-R7
ADM825MYRT-R7
ADM825TYKS-R7
ADM825TYRT-R7
ADM825SYKS-R7
ADM825SYRT-R7
ADM825RYKS-R7
ADM825RYRT-R7
ADM825ZYKS-R7
ADM825YYKS-R7
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
2.19
Temperature Range
–40°C to +85°C
–40°C to +125°C
–40°C to +85°C
–40°C to +125°C
–40°C to +85°C
–40°C to +125°C
–40°C to +85°C
–40°C to +125°C
–40°C to +85°C
–40°C to +125°C
–40°C to +85°C
–40°C to +85°C
© 2004 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
PR04534-0-6/04(PrB)
Rev.PrB | Page 10 of 10
Quantity
3k
3k
3k
3k
3k
3k
3k
3k
3k
3k
3k
3k
Similar pages