ADM810MART-REEL [ADI]
Microprocessor Supervisory Circuit in 3-Pin SOT-23; 微处理器监控电路的3引脚SOT- 23
| 型号： | ADM810MART-REEL |
| 厂家： | 
ADI |
| 描述： | Microprocessor Supervisory Circuit in 3-Pin SOT-23 |
| 文件： | 总6页 (文件大小：175K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Microprocessor
Supervisory Circuit in 3-Pin SOT-23
a
ADM809/ADM810
FUNCTIONAL BLOCK DIAGRAM
FEATURES
Superior Upgrade for MAX809/MAX810
Specified Over Temperature
Low Power Consumption (17 A)
Precision Voltage Monitor: +3 V, +3.3 V, +5 V Options
Reset Assertion Down to 1 V VCC
140 ms min Power-On Reset
ADM809/ADM810
V
CC
RESET
GENERATOR
240ms
RESET
(RESET)
V
REF
Logic Low RESET Output (ADM809)
Logic High RESET Output (ADM810)
GND
APPLICATIONS
Microprocessor Systems
Computers
Controllers
Intelligent Instruments
Automotive Systems
GENERAL DESCRIPTION
The ADM809/ADM810 supervisory circuits monitor the
power supply voltage in microprocessor systems. They pro-
vide a reset output during power-up, power-down and
brownout conditions. On power-up, an internal timer holds
reset asserted for 240 ms. This holds the microprocessor in a
reset state until conditions have stabilized. The RESET
output remains operational with VCC as low as 1 V. The
ADM809 provides an active low reset signal (RESET) while
the ADM810 provides an active high signal (RESET) output.
V
CC
V
V
CC
CC
RESET
INPUT
µP
SYSTEM
RESET
ADM809
Six reset threshold voltage options are available suitable for
monitoring a variety of supply voltages. Refer to Table I.
GND
GND
The reset comparator features built-in glitch immunity,
making it immune to fast transients on VCC
.
Figure 1. Typical Operating Circuit
The ADM809/ADM810 consumes only 17 µA, making it
suitable for low power portable equipment. It is packaged in
a 3-pin SOT-23 package.
REV. 0
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
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703
World Wide Web Site: http://www.analog.com
© Analog Devices, Inc., 1997
MIN to TMAX, VCC typ = 5 V for L/M/J, 3.3 V
for T/S, 3 V for R Models unless otherwise noted.)
ADM809/ADM810–SPECIFICATIONS (V = Full Operating Range, T = T
CC
A
Parameter
Min
Typ Max
Units
Test Conditions/Comments
VCC Operating Voltage Range
1.0
1.2
5.5
5.5
V
V
TA = 0°C to +70°C
TA = –40°C to +105°C
Supply Current
24
17
60
50
100
100
µA
µA
µA
µA
V
V
V
CC < 5.5 V, ADM8_L/M, TA = –40°C to +85°C
CC < 3.6 V, ADM8_R/S/T, TA = –40°C to +85°C
CC < 5.5 V, ADM8_L/M, TA = +85°C to +105°C
VCC < 3.6 V, ADM8_R/S/T, TA = +85°C to +105°C
RESET THRESHOLD
Reset Voltage Threshold
ADM8_L
4.56
4.5
4.63 4.70
4.75
4.86
4.38 4.45
4.5
4.56
4.00 4.06
4.10
4.20
3.08 3.11
3.15
3.23
2.93 2.96
3.00
3.08
2.63 2.66
2.70
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
TA = +25°C
ADM8_L
ADM8_L
ADM8_M
ADM8_M
ADM8_M
ADM8_ J
ADM8_ J
ADM8_ J
ADM8_T
ADM8_T
ADM8_T
ADM8_S
ADM8_S
ADM8_S
ADM8_R
ADM8_R
ADM8_R
TA = –40°C to +85°C
TA = +85°C to +105°C
TA = +25°C
TA = –40°C to +85°C
TA = +85°C to +105°C
TA = +25°C
TA = –40°C to +85°C
TA = +85°C to +105°C
TA = +25°C
TA = –40°C to +85°C
TA = +85°C to +105°C
TA = +25°C
TA = –40°C to +85°C
TA = +85°C to +105°C
TA = +25°C
TA = –40°C to +85°C
TA = +85°C to +105°C
4.40
4.31
4.25
4.16
3.93
3.89
3.80
3.04
3.00
2.92
2.89
2.85
2.78
2.59
2.55
2.50
2.76
Reset Threshold Temperature Coefficient
VCC to Reset Delay
30
20
ppm/°C
µs
VCC = VTH to (VTH –100 mV)
Reset Active Timeout Period
140
100
240 560
840
ms
ms
TA = –40°C to +85°C
TA = +85°C to +105°C
RESET Output Voltage Low (ADM809)
0.3
0.4
0.3
V
V
V
VCC = VTH min, ISINK = 1.2 mA, ADM809R/S/T
VCC = VTH min, ISINK = 3.2 mA, ADM809L/M
VCC >1.0 V, ISINK = 50 µA
RESET Output Voltage High (ADM809)
0.8 VCC
VCC–1.5
V
V
VCC > VTH max, ISOURCE = 500 µA, ADM809R/S/T
VCC > VTH max, ISOURCE = 800 µA, ADM809L/M
RESET Output Voltage Low (ADM810)
0.3
0.4
V
V
VCC = VTH min, ISINK = 1.2 mA, ADM810R/S/T
VCC = VTH min, ISINK = 3.2 mA, ADM810L/M
RESET Output Voltage High (ADM810) 0.8 VCC
V
1.8 V < VCC < VTH min, ISOURCE = 150 µA
ABSOLUTE MAXIMUM RATINGS*
(TA = +25°C unless otherwise noted)
Power Dissipation, RT-3 SOT-23 . . . . . . . . . . . . . . . . 320 mW
Derate by 4 mW/°C above +70°C
θJA Thermal Impedance . . . . . . . . . . . . . . . . . . . . . . . 333°C/W
Lead Temperature (Soldering, 10 sec) . . . . . . . . . . . . +300°C
Vapor Phase (60 sec) . . . . . . . . . . . . . . . . . . . . . . . . +215°C
Infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . . . +220°C
Storage Temperature Range . . . . . . . . . . . . . –65°C to +150°C
VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +6 V
RESET, RESET . . . . . . . . . . . . . . . . . . –0.3 V to Vcc + 0.5 V
Input Current
VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 mA
Output Current
*Stresses above those listed under Absolute Maximum Ratings may cause perma-
nent damage to the device. This is a stress rating only; functional operation of the
device at these or any other conditions above those listed in the operational sections
of this specification is not implied. Exposure to absolute maximum ratings for
extended periods of time may affect device reliability.
RESET, RESET . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 mA
Rate of Rise, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 V/µs
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 the ADM809/ADM810 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.
WARNING!
ESD SENSITIVE DEVICE
REV. 0
–2–
ADM809/ADM810
PIN FUNCTION DESCRIPTION
V
V
V
V
REF
REF
REF
REF
V
Pin Mnemonic
Function
CC
1
2
GND
0 V. Ground reference for all signals.
RESET
t1
t1
RESET (ADM809) Active Low Logic Output. RESET
remains low while VCC is below the
reset threshold, and remains low for
240 ms (typ) after VCC rises above
the reset threshold
t1 = RESET TIME = 240ms TYP.
= RESET VOLTAGE THRESHOLD
V
REF
Figure 2. Power Fail Reset Timing
2
3
RESET (ADM810) Active High Logic Output. RESET
remains high while VCC is below the
reset threshold, and remains high for
240 ms (typ) after VCC rises above
the reset threshold.
Table I. Reset Threshold Options
RESET
Model
Threshold
ADM809LART
ADM809MART
ADM809JART
ADM809TART
ADM809SART
ADM809RART
4.63 V
4.38 V
4.00 V
3.08 V
2.93 V
2.63 V
VCC
Supply voltage being monitored.
PIN CONFIGURATION
ADM810LART
ADM810MART
ADM810JART
ADM810TART
ADM810SART
ADM810RART
4.63 V
4.38 V
4.00 V
3.08 V
2.93 V
2.63 V
GND
1
2
ADM809/
ADM810
V
3
CC
TOP VIEW
(Not to Scale)
RESET, RESET
RESET, RESET
ORDERING GUIDE
Reset
Threshold
Temperature
Range
Brand
Information
Model*
Quantity
ADM809LART-REEL
ADM809LART-REEL-7
ADM809MART-REEL
ADM809MART-REEL-7
ADM809JART-REEL
ADM809JART-REEL-7
ADM809TART-REEL
ADM809TART-REEL-7
ADM809SART-REEL
ADM809SART-REEL-7
ADM809RART-REEL
ADM809RART-REEL-7
4.63 V
4.63 V
4.38 V
4.38 V
4.00 V
4.00 V
3.08 V
3.08 V
2.93 V
2.93 V
2.63 V
2.63 V
–40°C to +105°C
–40°C to +105°C
–40°C to +105°C
–40°C to +105°C
–40°C to +105°C
–40°C to +105°C
–40°C to +105°C
–40°C to +105°C
–40°C to +105°C
–40°C to +105°C
–40°C to +105°C
–40°C to +105°C
9LXX
9LXX
9MXX
9MXX
9JXX
10K
3K
10K
3K
10K
3K
10K
3K
10K
3K
10K
3K
9JXX
9TXX
9TXX
9SXX
9SXX
9RXX
9RXX
ADM810LART-REEL
ADM810LART-REEL-7
ADM810MART-REEL
ADM810MART-REEL-7
ADM810JART-REEL
ADM810JART-REEL-7
ADM810TART-REEL
ADM810TART-REEL-7
ADM810SART-REEL
ADM810SART-REEL-7
ADM810RART-REEL
ADM810RART-REEL-7
4.63 V
4.63 V
4.38 V
4.38 V
4.00 V
4.00 V
3.08 V
3.08 V
2.93 V
2.93 V
2.63 V
2.63 V
–40°C to +105°C
–40°C to +105°C
–40°C to +105°C
–40°C to +105°C
–40°C to +105°C
–40°C to +105°C
–40°C to +105°C
–40°C to +105°C
–40°C to +105°C
–40°C to +105°C
–40°C to +105°C
–40°C to +105°C
ALXX
ALXX
AMXX
AMXX
AJXX
10K
3K
10K
3K
10K
3K
10K
3K
10K
3K
10K
3K
AJXX
ATXX
ATXX
ASXX
ASXX
ARXX
ARXX
*Only available in Reels.
REV. 0
–3–
ADM809/ADM810
—Typical Performance Characteristics
200
180
160
140
120
100
30
V
= V – V
V
= V – V
TH CC
OD
TH
CC
OD
180
160
V
= 5V
CC
V
= 10mV
V
= 10mV
25
20
15
10
5
OD
OD
140
120
100
80
V
= 3V
CC
V
= 20mV
OD
80
60
40
V
= 20mV
OD
60
V
= 100mV
V
= 100mV
= 200mV
40
20
0
OD
OD
V
= 1V
C
CC
20
0
V
V
= 200mV
OD
OD
40
TEMPERATURE
0
–40
–20
0
20
60
C
80 85
–40
–20
0
20
40
60
C
80 85
–40
–20
0
20
40
60
80 85
TEMPERATURE
TEMPERATURE
Figure 4. Power-Down RESET Delay
vs. Temperature ADM8_L/M
Figure 5. Power-Down RESET Delay
vs. Temperature ADM8_T/S/R
Figure 3. Supply Current vs. Tem-
perature (ADM8_L/M/R/S/T) (No Load)
1.002
1.0015
1.001
1.0005
1.0
240
239.5
239
SUPPLY VOLTAGE
5V
PK TO PK
238.5
T
238
237.5
RESET OUTPUT
VOLTAGE
1
237
ADM809T
ADM809R
236.5
T
236
2
0.9995
0.999
235.5
235
2.00V CH2
CH1
CH1
2.00V M 200ms
2.00V
–40
–20
0
20
40
60
80 85
–40
–20
0
20
40
60
80 85
TEMPERATURE
C
TEMPERATURE
C
Figure 7. Normalized RESET Voltage
Threshold vs. Temperature
Figure 6. Power-Down RESET Delay
vs. Temperature ADM8_R
Figure 8. RESET Output Voltage vs.
Supply Voltage
400
350
300
250
200
150
ADM8_L/M
100
ADM8_R/S/T
50
0
1
10
100
1000
RESET COMPARATOR OVERDRIVE, V – V (mV)
TH CC
Figure 9. Maximum Transient Dura-
tion Without Causing a RESET Pulse
vs. RESET Comparator Overdrive
REV. 0
–4–
ADM809/ADM810
INTERFACING TO OTHER DEVICES OUTPUT
The ADM809/ADM810 Series is designed to integrate with as
many devices as possible and therefore has a standard output
dependant on VCC. This enables the part to be used in both 3 V
and 5 V or any nominal voltage within the minimum and maxi-
mum specifications for VCC. Because of this design approach,
interfacing this device to other devices is simplified.
THE BENEFITS OF A VERY ACCURATE RESET
THRESHOLD
In other microprocessor supervisory circuits, tolerances in sup-
ply voltages lead to an overall increase in RESET tolerance
levels due to the deterioration of the microprocessor RESET
circuit’s power supply. The possibility of a malfunction during
a power failure is greatly reduced because the ADM809 and
ADM810 series can operate effectively even when there are
large degradations of the supply voltages. Another advantage of
the ADM809 and ADM810 series is its very accurate internal
voltage reference circuit. These benefits combine to produce an
exceptionally reliable Voltage Monitor Circuit.
ENSURING A VALID RESET OUTPUT DOWN TO VCC = 0 V
When VCC falls below 0.8 V, ADM809’s RESET no longer
sinks current. A high impedance CMOS logic input connected
to RESET may, therefore, drift to undetermined logic levels. To
eliminate this problem a 100 kΩ resistor should be connected
from RESET to ground.
INTERFACING TO MICROPROCESSORS WITH
MULTIPLE INTERRUPTS
V
In a number of cases it is necessary to interface many interrupts
from different devices (i.e., thermal, attitude and velocity sen-
sors). The ADM809 and ADM810 can easily be integrated into
existing interrupt-handling circuits (Figure 11) or used as a
stand-alone device.
CC
V
CC
ADM809
RESET
PRIORITY ENCODER
4 LINE BCD
TO µP
74LS147
V
CC
V
CC
GND
ADM809
OTHER SENSING
RESET
DEVICES
Figure 10. Ensuring a Valid RESET Output Down to
VCC = 0 V
GND
Figure 11. Interfacing to µPs with Multiple Interrupts
REV. 0
–5–
ADM809/ADM810
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
Surface Mount Package
RT-3
0.1200 (3.048)
0.1102 (2.799)
3
0.0550 (1.397)
0.0470 (1.194)
0.1040 (2.642)
0.0827 (2.101)
1
2
PIN 1
0.0236 (0.599)
0.0177 (0.450)
0.0413 (1.049)
0.0374 (0.950)
0.0807 (2.050)
0.0701 (1.781)
0.0059 (0.150)
0.0034 (0.086)
0.0440 (1.118)
0.0320 (0.813)
0.0040 (0.102)
0.0005 (0.013)
0.0210 (0.533)
0.0146 (0.371)
0.0100 (0.254)
0.027 (0.686)
REF
SEATING
PLANE
0.0050 (0.127)
–6–
REV. 0
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