Analog Devices ADM812TART-REEL-7, ADM812TART-REEL, ADM812SART-REEL-7, ADM812SART-REEL, ADM812RART-REEL-7 Datasheet
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which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
a
ADM811/ADM812
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700 World Wide Web Site: http://www.analog.com
Fax: 781/326-8703 © Analog Devices, Inc., 1999
Microprocessors
Supervisory Circuit in 4-Lead SOT-143
FUNCTIONAL BLOCK DIAGRAM
DEBOUNCE
RESET/RESET
GND
V
CC
MR
V
REF
ADM811/ADM812
RESET
GENERATOR
FEATURES
Superior Upgrade for MAX811/MAX812
Specified Over Temperature
Low Power Consumption (5 A Typ)
Precision Voltage Monitor: +3 V, +3.3 V, +5 V Options
Reset Assertion Down to 1 V V
CC
140 ms Min Power-On Reset
Logic Low RESET Output (ADM811)
Logic High RESET Output (ADM812)
Built-In Manual Reset
APPLICATIONS
Microprocessor Systems
Controllers
Intelligent Instruments
Automotive Systems
Safety Systems
Portable Instruments
GENERAL DESCRIPTION
The ADM811/ADM812 are reliable voltage monitoring devices
suitable for use in most voltage monitoring applications.
The ADM811/ADM812 are designed to monitor five different
voltages, each allowing for a 5% or 10% degradation of standard
PSU voltages before a reset occurs. These voltages have been
selected for the effective monitoring of +3 V, +3.3 V and +5 V
supply voltage levels.
Included in this circuit is a debounced Manual Reset input.
Reset can be activated using an electrical switch (or an input
from another digital device) or by a degradation of the supply
voltage. The Manual Reset function is very useful especially if
the circuit in which the ADM811/ADM812 is operating enters
into a state that can only be detected by the user. Allowing the
user to manually reset a system can reduce the damage or danger that could be otherwise caused by an out-of-control or
locked up system.
V
CC
RESET
RESET
ADM811
V
CC
MR
GND
GND
mP
SYSTEM
100kV
Figure 1. Typical Operating Circuit
–2–
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ADM811/ADM812–SPECIFICATIONS
(VCC = Full Operating Range, TA = T
MIN
to T
MAX
, VCC typ = +5 V
for L/M, +3.3 V for T/S, +3 V for R Models unless otherwise noted)
P
arameter Min Typ Max Units Test Conditions/Comments
SUPPLY
Voltage 1.0 5.5 V T
A
= 0°C to +70°C
1.2 V T
A
= –40°C to +85°C
Current 8 15 µAV
CC
< +5.5 V, ADM81_L/M, I
OUT
= 0 A
510 µAV
CC
< +3.6 V, ADM81_R/S/T, I
OUT
= 0 A
RESET VOLTAGE THRESHOLD
ADM81_L 4.54 4.63 4.72 V T
A
= +25°C
ADM81_L 4.50 4.75 V T
A
= –40°C to +85°C
ADM81_M 4.30 4.38 4.46 V T
A
= +25°C
ADM81_M 4.25 4.50 V T
A
= –40°C to +85°C
ADM81_T 3.03 3.08 3.14 V T
A
= +25°C
ADM81_T 3.00 3.15 V T
A
= –40°C to +85°C
ADM81_S 2.88 2.93 2.98 V T
A
= +25°C
ADM81_S 2.85 3.00 V T
A
= –40°C to +85°C
ADM81_R 2.58 2.63 2.68 V T
A
= +25°C
ADM81_R 2.55 2.70 V T
A
= –40°C to +85°C
RESET THRESHOLD
TEMPERATURE COEFFICIENT 30 ppm/°C
V
CC
TO RESET/RESET DELAY 40 µsV
OD
= 125 mV, ADM81_L/M
20 µsV
OD
= 125 mV, ADM81_R/S/T
RESET ACTIVE TIMEOUT PERIOD 140 560 ms V
CC
= V
TH(MAX)
300 700 ms (ADM811-3T Only)
MANUAL RESET
Minimum Pulsewidth 10 µs
Glitch Immunity 100 ns
RESET/RESET Propagation Delay 0.5 µs
Pull-Up Resistance 10 20 30 kΩ
The Manual Reset Circuit Will Act On
An Input Rising Above 2.3 V V
CC
> V
TH(MAX),
ADM81_L/M
An Input Falling Below 0.8 V V
CC
> V
TH(MAX),
ADM81_L/M
An Input Rising Above 0.7 × V
CC
VV
CC
> V
TH(MAX),
ADM81_R/S/T
An Input Falling Below 0.25 × V
CC
VV
CC
> V
TH(MAX),
ADM81_R/S/T
RESET Output Voltage
Low (ADM812R/S/T) 0.3 V V
CC
= V
TH(MAX)
, I
SINK
= 1.2 mA
Low (ADM812L/M) 0.4 V VCC = V
TH(MAX)
, I
SINK
= 3.2 mA
High (ADM812R/S/T/L/M) 0.8 V
CC
V 1.8 V < V
CC
< V
TH(MIN)
, I
SOURCE
= 150 µA
Low (ADM811R/S/T) 0.3 V VCC = V
TH(MIN)
, I
SINK
= 1.2 mA
Low (ADM811L/M) 0.4 V V
CC
= V
TH(MIN)
, I
SINK
= 3.2 mA
Low (ADM811R/S/T/L/M) 0.3 V VCC > 1.0 V, I
SINK
= 50 µA
High (ADM811R/S/T) 0.8 V
CC
VV
CC
> V
TH(MAX)
, I
SOURCE
= 500 µA
High (ADM811L/M) V
CC
– 1.5 V VCC > V
TH(MAX)
, I
SOURCE
= 800 µA
Specifications subject to change without notice.
ABSOLUTE MAXIMUM RATINGS*
(Typical values are at T
A
= +25°C unless otherwise noted)
Terminal Voltage (With Respect to Ground)
V
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +6 V
All Other Inputs . . . . . . . . . . . . . . . . .–0.3 V to V
CC
+ 0.3 V
Input Current
V
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 mA
MR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 mA
Output Current
RESET, RESET . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 mA
Power Dissipation (T
A
= +70°C)
RT-4, SOT-143 . . . . . . . . . . . . . . . . . . . . . . . . . . . 200 mW
Derate by 4 mW/°C above +70°C
θ
JA
Thermal Impedance . . . . . . . . . . . . . . . . . . . . 330°C/W
Operating Temperature Range . . . . . . . . . . . –40°C to +85°C
Storage Temperature Range . . . . . . . . . . . . –65°C to +160°C
Lead Temperature (Soldering, 10 sec) . . . . . . . . . . . .+300°C
Vapor Phase (60 sec) . . . . . . . . . . . . . . . . . . . . . . . .+215°C
Infrared (15 secs) . . . . . . . . . . . . . . . . . . . . . . . . . . .+220°C
ESD Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 kV
*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.
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