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ADM811MARTZ-REEL7

P1-P3P4-P6P7-P9P10-P12
Microprocessor Supervisory
Circuit in 4-Lead SOT-143 with DSP
Data Sheet
ADM811/ADM812
Rev. H Document Feedback
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FEATURES
Superior upgrade for MAX811/MAX812
Specified over temperature
Low power consumption: 5 μA typical
Precision voltage monitor: 2.5 V, 3 V, 3.3 V, 5 V options
Reset assertion down to 1 V
CC
Power-on reset: 140 ms minimum
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
FUNCTIONAL BLOCK DIAGRAM
RESET
GENERATOR
DEBOUNCE
V
REF
RESET/RESET
GND
V
CC
MR
ADM811/ADM812
0
0092-001
Figure 1.
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 six different voltages,
each allowing a 5% or 10% degradation of standard PSU voltages
before a reset occurs. These voltages have been selected for the
effective monitoring of 2.5 V, 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 are operating enters
into a state that can only be detected by the user. Allowing the
user to reset a system manually can reduce the damage or
danger that could otherwise be caused by an out-of-control
or locked system.
ADM811
GND
V
CC
MR RESET
MICROPROCESSOR
SYSTEM
GND
V
CC
RESET
100kΩ
0
0092-002
Figure 2. Typical ADM811 Operating Circuit
ADM811/ADM812 Data Sheet
Rev. H | 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 ............................................................ 5
ESD Caution .................................................................................. 5
Pin Configuration and Function Descriptions ............................. 6
Typical Performance Characteristics ............................................. 7
Circuit Information .......................................................................... 8
Reset Thresholds ...........................................................................8
Reset Output ..................................................................................8
Manual Reset ..................................................................................8
Glitch Immunity ............................................................................8
Interfacing to Other Devices ............................................................9
Output .............................................................................................9
Benefits of a Very Accurate Reset Threshold ............................9
Ensuring a Valid
RESET
/Reset Output Down to V
CC
= 0 V....9
Outline Dimensions ....................................................................... 10
Ordering Guide .......................................................................... 10
REVISION HISTORY
3/16—Rev. G to Rev. H
Changed ADM81x to ADM811/ADM812 ................. Throughout
Change RESET/
RESET
Output Voltage Parameter, Table 1 ......... 3
Changes to Ordering Guide .......................................................... 10
3/13—Rev. F to Rev. G
Changes to Pin 4 Description; Table 3 ........................................... 5
Updated Outline Dimensions ......................................................... 9
Changes to Ordering Guide .......................................................... 10
8/09—Rev. E to Rev. F
Changes to Ordering Guide .......................................................... 10
5/08—Rev. D to Rev. E
Changes to Table 2 ............................................................................ 4
Updated Outline Dimensions ......................................................... 9
Changes to Ordering Guide .......................................................... 10
5/06—Rev. C to Rev. D
Changes to Ordering Guide ............................................................ 9
2/03—Rev. B to Rev. C
Changes to Features Section ............................................................ 1
Changes to General Description Section ....................................... 1
Changes to Specifications Section ................................................... 2
Removed Note 2 from Ordering Guide .......................................... 3
Changes to Pin Function Descriptions ........................................... 4
Removed Note from Table I ............................................................ 6
1/03—Rev. A to Rev. B
Added ADM812 ................................................................. Universal
Changes to Specifications ................................................................. 2
Changes to Ordering Guide ............................................................. 3
Changes to Pin Configuration ......................................................... 4
Changes to Pin Function Description ............................................ 4
Additions to Table I ........................................................................... 6
Changes to Manual Reset section .................................................... 6
5/02—Rev. 0 to Rev. A
Deleted ADM812 ................................................................ Universal
4/99—Revision 0: Initial Version
Data Sheet ADM811/ADM812
Rev. H | Page 3 of 12
SPECIFICATIONS
V
CC
= full operating range; T
A
= T
MIN
to T
MAX
; V
CC
typical = 5 V for L/M models, 3.3 V for T/S models, 3 V for R model, 2.5 V for Z
models, unless otherwise noted.
Table 1.
Parameter Min Typ Max Unit 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 µA
V
CC
< 5.5 V, ADM811L/ADM812L/ADM811M/ADM812M,
I
OUT
= 0 mA
5 10 µA
V
CC
< 3.6 V, ADM811R/ADM812R/ADM811S/ADM812S/
ADM811T/ADM812T/ADM811Z/ADM812Z, I
OUT
= 0 mA
RESET VOLTAGE THRESHOLD
ADM811L/ADM812L 4.54 4.63 4.72 V T
A
= 25°C
ADM811L/ADM812L 4.50 4.75 V T
A
= −40°C to +85°C
ADM811M/ADM812M 4.30 4.38 4.46 V T
A
= 25°C
ADM811M/ADM812M 4.25 4.50 V T
A
= −40°C to +85°C
ADM811T/ADM812T 3.03 3.08 3.14 V T
A
= 25°C
ADM811T/ADM812T 3.00 3.15 V T
A
= −40°C to +85°C
ADM811S/ADM812S
2.88
2.93
2.98
V
T
A
= 25°C
ADM811S/ADM812S 2.85 3.00 V T
A
= −40°C to +85°C
ADM811R/ADM812R 2.58 2.63 2.68 V T
A
= 25°C
ADM811R/ADM812R 2.55 2.70 V T
A
= −40°C to +85°C
ADM811Z/ADM812Z 2.28 2.32 2.35 V T
A
= 25°C
ADM811Z/ADM812Z 2.25 2.38 V T
A
= −40°C to +85°C
RESET THRESHOLD TEMPERATURE
COEFFICIENT
30 ppm/°C
V
CC
TO RESET/RESET DELAY
40 µs V
OD
= 125 mV, ADM811L/ADM812L/ADM811M/ADM812M
20 µs
V
OD
= 125 mV, ADM811R/ADM812R/ADM811S/ADM812S/
ADM811T/ADM812T/ADM811Z/ADM812Z
RESET ACTIVE TIMEOUT PERIOD 140 560 ms V
CC
= V
TH(MAX)
300 700 ms ADM811-3T only
MANUAL RESET
Minimum Pulse Width 10 µs
Glitch Immunity 100 ns
RESET/RESET Propagation Delay
0.5 µs
Pull-Up Resistance 10 20 30 kΩ
The Manual Reset Circuit Acts On
An Input Rising Above 2.3 V V
CC
> V
TH(MAX)
, ADM811L/ADM812L/ADM811M/ADM812M
An Input Falling Below 0.8 V V
CC
> V
TH(MAX)
, ADM811L/ADM812L/ADM811M/ADM812M
An Input Rising Above 0.7 × V
CC
V
V
CC
> V
TH(MAX)
, ADM811R/ADM812R/ADM811S/ADM812S/
ADM811T/ADM812T/ADM811Z/ADM812Z
An Input Falling Below
0.25 × V
CC
V
V
CC
> V
TH(MAX)
, ADM811R/ADM812R/ADM811S/ADM812S/
ADM811T/ADM812T/ADM811Z/ADM812Z
P1-P3P4-P6P7-P9P10-P12

ADM811MARTZ-REEL7

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Manufacturer:
Analog Devices Inc.
Description:
Supervisory Circuits 5V CMOS MPU IC Logic Low Reset Bar Output
Lifecycle:
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