ADM823RYRT-R7 [ADI]
Supervisory Circuits with Watchdog and Manual Reset in 5-Lead SC70 and SOT-23; 监控电路，带有看门狗和手动复位功能5引脚SC70和SOT -23
| 型号： | ADM823RYRT-R7 |
| 厂家： | 
ADI |
| 描述： | Supervisory Circuits with Watchdog and Manual Reset in 5-Lead SC70 and SOT-23 |
| 文件： | 总10页 (文件大小：176K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Supervisory Circuits with Watchdog and
Manual Reset in 5-Lead SC70 and SOT-23
Preliminary Technical Data
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:
ADM823
V
CC
V
CC
RESET
RESET
GENERATOR
V
REF
DEBOUNCE
MR
RESET
RESET
(ADM823)
WATCHDOG
DETECTOR
, RESET (ADM824/ADM825)
Low power consumption (3 µA)
Guaranteed reset output valid to VCC = 1 V
Power supply glitch immunity
GND
WDI
Figure 1.
Specified over automotive temperature range
5-lead SC70 and SOT-23 packages
APPLICATIONS
Microprocessor systems
Computers
Controllers
Intelligent instruments
Portable equipment
GENERAL DESCRIPTION
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 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.
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
RESET
RESET
Part No.
ADM823
ADM824
ADM825
Watchdog Timer
Manual Reset
Yes
Yes
–
Yes
–
Push-Pull
Push-Pull
Push-Pull
–
Push-Pull
Push-Pull
Yes
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
Fax: 781.326.8703
www.analog.com
© 2004 Analog Devices, Inc. All rights reserved.
ADM823/ADM824/ADM825
Preliminary Technical Data
TABLE OF CONTENTS
Specifications..................................................................................... 3
Typical Performance Characteristics ..............................................7
OUTLINE DIMENSIONS ...............................................................9
Ordering Guides......................................................................... 10
Absolute Maximum Ratings............................................................ 5
ESD Caution.................................................................................. 5
Pin Configurations and Function Descriptions ........................... 6
Rev.PrB | Page 2 of 10
Preliminary Technical Data
SPECIFICATIONS
ADM823/ADM824/ADM825
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,
V
V
CC = 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,
CC = 2.25 V to 2.75 V for ADM82_Y, TA = TMIN to TMAX, unless otherwise noted
Table 2.
Parameter
SUPPLY
Min
Typ
Max
Unit
Test Conditions/Comments
VCC Operating Voltage Range
1
1.2
5.5
24
12
V
V
µA
TA = 0°C to +70°C
TA = TMIN to TMAX
Supply Current
10
5
MR
WDI and
ADM82_L/M
MR
unconnected
µA
WDI and
unconnected
ADM82_T/S/R/Z/Y
RESET THRESHOLD VOLTAGE
ADM82_L
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
4.63
4.38
3.08
2.93
2.63
2.32
2.19
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
V
V
V
V
V
V
V
V
V
V
V
V
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_M
ADM82_T
ADM82_S
ADM82_R
ADM82_Z (SC70 only)
ADM82_Y (SC70 only)
RESET THRESHOLD TEMPERATURE COEFFICIENT
RESET THRESHOLD HYSTERESIS
40
10
5
ppm/°C
mV
mV
ms
µs
ADM82_L/M
ADM82_T/S/R/Z/Y
RESET TIMEOUT PERIOD
VCC TO RESET DELAY
140
200
40
280
VTH – VCC = 100 mV
RESET
0.4
0.3
0.3
V
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
Output Voltage
V
V
VCC − 1.5
0.8 × VCC
V
VCC = VTH max, ISOURCE = 120 µA,
ADM82_L/M
V
VCC = VTH max, ISOURCE = 30 µA,
ADM82_T/S/R/Z/Y
RESET
800
400
µA
µA
RESET
Output Short Circuit Current
= 0 V, VCC = 5.5 V,
ADM82_L/M
RESET
= 0 V, VCC = 5.5 V,
ADM82_T/S/R/Z/Y
RESET Output Voltage
0.4
0.3
V
V
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
0.8 × VCC
V
VCC > = 1.8 V, ISOURCE = 150 µA
Rev.PrB | Page 3 of 10
ADM823/ADM824/ADM825
Preliminary Technical Data
Parameter
Min
Typ
Max
Unit
Test Conditions/Comments
WATCHDOG INPUT (ADM823, ADM824)
Watchdog Timeout Period
WDI Pulse Width
WDI Input Threshold
VIL
1.12
50
1.6
2.40
s
ns
VIL = 0.4 V, VIH = 0.8 × V CC,
0.3 × VCC
160
V
V
µA
µA
VIH
0.7 × VCC
−20
WDI Input Current
120
−15
VWDI = VCC, time average
VWDI = 0, time average
MANUAL RESET INPUT (ADM823, ADM825)
MR
0.3 × VCC
V
Input Threshold
0.7 × VCC
1
V
µs
ns
MR
MR
MR
MR
Input Pulse Width
Glitch Rejection
Pull-up Resistance
to Reset Delay
100
52
35
75
k⍀
ns
500
Rev.PrB | Page 4 of 10
Preliminary Technical Data
ADM823/ADM824/ADM825
ABSOLUTE MAXIMUM RATINGS
TA = 25°C, unless otherwise noted.
Table 3.
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.
Parameter
Rating
VCC
–0.3 V to +6 V
20 mA
RESET
Output Current (RESET,
)
Operating Temperature Range
Storage Temperature Range
–40°C to +125°C
–65°C to +150°C
θJA Thermal Impedance
SC70
146°C/W
270°C/W
SOT-23
Lead Temperature
Soldering (10 sec)
Vapor Phase (60 sec)
Infrared (15 sec)
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
GND
MR
1
2
3
5
V
RESET
GND
1
2
3
5
V
RESET
GND
1
2
3
5
V
CC
CC
CC
ADM823
ADM824
ADM825
TOP VIEW
TOP VIEW
TOP VIEW
(Not to Scale)
(Not to Scale)
(Not to Scale)
4
WDI
RESET
4
WDI
RESET
4
MR
Figure 2. ADM823 Pin Configuration
Figure 3. ADM824 Pin Configuration
Figure 4. ADM825 Pin Configuration
Table 4. Pin Function Descriptions
Pin. No. Mnemonic
Description
1
2
3
RESET
GND
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.
.
MR
(ADM823)
RESET (ADM824/ADM825)
WDI (ADM823/ADM824)
Active-High, Push-Pull Reset Output.
4
5
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.
MR
VCC
Manual Reset Input.
(ADM825)
Power Supply Voltage Being Monitored.
Rev.PrB | Page 6 of 10
Preliminary Technical Data
ADM823/ADM824/ADM825
TYPICAL PERFORMANCE CHARACTERISTICS
10.0
9.5
9.0
8.5
100
90
80
70
60
50
40
30
20
10
0
ADM823L
8.0
7.5
7.0
6.5
6.0
ADM824Y
–20
5.5
5.0
4.5
4.0
3.5
ADM825R
40
–40
0
20
60
80
100
120
–40
–20
0
20
40
60
80
100
120
TEMPERATURE (°C)
TEMPERATURE (°C)
Figure 5. Supply Current vs. Temperature
Figure 8. Reset Comparator Propagation Delay vs. Temperature (VCC Falling)
80
75
70
65
60
55
50
45
40
35
30
25
20
15
10
5
340
320
300
280
260
240
220
200
180
160
140
120
100
0
–40
–20
0
20
40
60
80
100
120
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
(V)
TEMPERATURE (°C)
V
CC
Figure 9. Manual Reset to Reset Propagation Delay vs. Temperature
(ADM823/ADM825)
Figure 6. Supply Current vs. Supply Voltage
1.05
1.04
1.03
1.02
1.01
1.00
0.99
0.98
0.97
0.96
0.95
250
240
230
220
210
200
190
180
170
–40
–20
0
20
40
60
80
100
120
–40
–20
0
20
40
60
80
100
120
TEMPERATURE (°C)
TEMPERATURE (°C)
Figure 7. Normalized Reset Threshold vs. Temperature
Figure 10. Reset Timeout Period vs. Temperature
Rev.PrB | Page 7 of 10
ADM823/ADM824/ADM825
Preliminary Technical Data
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
190
180
170
160
150
140
130
120
110
100
–40
–20
0
25
60
85
125
–50
0
50
100
TEMPERATURE
TEMPERATURE (°C)
Figure 11. Watchdog Timeout Period vs. Temperature
(ADM823/ADM824)
Figure 13. Manual Reset Minimum Pulse Width vs. Temperature
(ADM823/ADM825)
160
140
120
100
80
3.8
3.6
3.4
NEGATIVE PULSE
3.2
3.0
2.8
2.6
V
= 4.9V
TH
60
40
POSITIVE PULSE
2.4
2.2
2.0
20
V
= 2.93V
TH
0
10
100
1000
–40
10
60
110
160
OVER DRIVE VOD (mV)
TEMPERATURE (°C)
Figure 12. Maximum VCC Transient Duration vs. Reset Threshold Overdrive
Figure 14. Watchdog Input Minimum Pulse Width vs. Temperature
(ADM823/ADM824)
Rev.PrB | Page 8 of 10
Preliminary Technical Data
OUTLINE DIMENSIONS
ADM823/ADM824/ADM825
2.00 BSC
2
5
1
4
3
1.25 BSC
2.10 BSC
PIN 1
0.65 BSC
1.10 MAX
1.00
0.90
0.70
0.22
0.08
0.46
0.36
0.26
8°
4°
0°
0.30
0.15
0.10 M
AX
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
3
2.80 BSC
1.60 BSC
2
PIN 1
0.95 BSC
1.90
BSC
1.30
1.15
0.90
1.45 MAX
0.22
0.08
10°
5°
0.15 MAX
0.50
0.30
0.60
0.45
0.30
SEATING
PLANE
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
ADM823/ADM824/ADM825
Preliminary Technical Data
ORDERING GUIDES
Table 5. ADM823 Ordering Guide
Model
Reset Threshold (V)
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
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
Branding
N07
N07
N07
N07
N07
N07
N07
N07
N07
N07
N07
N07
ADM823LYKS-R7
ADM823LYRT-R7
ADM823MYKS-R7
ADM823MYRT-R7
ADM823TYKS-R7
ADM823TYRT-R7
ADM823SYKS-R7
ADM823SYRT-R7
ADM823RYKS-R7
ADM823RYRT-R7
ADM823ZYKS-R7
ADM823YYKS-R7
4.63
4.63
4.38
4.38
3.08
3.08
2.93
2.93
2.63
2.63
2.32
2.19
3k
3k
3k
3k
3k
3k
3k
3k
3k
3k
3k
3k
SC70-5
Table 6. ADM824 Ordering Guide
Model1
Reset Threshold (V)
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
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
Branding
N08
N08
N08
N08
N08
N08
N08
N08
N08
N08
N08
N08
ADM824LYKS-R7
ADM824LYRT-R7
ADM824MYKS-R7
ADM824MYRT-R7
ADM824TYKS-R7
ADM824TYRT-R7
ADM824SYKS-R7
ADM824SYRT-R7
ADM824RYKS-R7
ADM824RYRT-R7
ADM824ZYKS-R7
ADM824YYKS-R7
4.63
4.63
4.38
4.38
3.08
3.08
2.93
2.93
2.63
2.63
2.32
2.19
3k
3k
3k
3k
3k
3k
3k
3k
3k
3k
3k
3k
SC70-5
1 All of the ADM824 models are nonstandard. Contact factory for availability of nonstandard models.
Table 7. ADM825 Ordering Guide
Model1
Reset Threshold (V)
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
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
Branding
N09
N09
N09
N09
N09
N09
N09
N09
N09
N09
N09
N09
ADM825LYKS-R7
ADM825LYRT-R7
ADM825MYKS-R7
ADM825MYRT-R7
ADM825TYKS-R7
ADM825TYRT-R7
ADM825SYKS-R7
ADM825SYRT-R7
ADM825RYKS-R7
ADM825RYRT-R7
ADM825ZYKS-R7
ADM825YYKS-R7
4.63
4.63
4.38
4.38
3.08
3.08
2.93
2.93
2.63
2.63
2.32
2.19
3k
3k
3k
3k
3k
3k
3k
3k
3k
3k
3k
3k
SC70-5
©
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
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