Datasheet

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Microprocessor Supervisory

Circuit in 4-Lead SOT-143 with DSP

Data Sheet

ADM811/ADM812

Rev. G 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

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

REF

RESET/RESET

GND

ADM811/ADM812

00092-001

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

MR RESET

MICROPROCESSOR

SYSTEM

GND

RESET

100kΩ

00092-002

Figure 2. Typical ADM811 Operating Circuit

Summary of content (12 pages)

PAGE 1
Microprocessor Supervisory Circuit in 4-Lead SOT-143 with DSP ADM811/ADM812 Data Sheet FEATURES FUNCTIONAL BLOCK DIAGRAM ADM811/ADM812 VCC RESET GENERATOR VREF MR RESET/RESET DEBOUNCE 00092-001 Superior upgrade for MAX811/MAX812 Specified over temperature Low power consumption: 5 µA typical Precision voltage monitor: 2.5 V, 3 V, 3.
PAGE 2
ADM811/ADM812 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Reset Thresholds ...........................................................................7 Applications ....................................................................................... 1 Reset Output ..................................................................................7 Functional Block Diagram ......................................
PAGE 3
Data Sheet ADM811/ADM812 SPECIFICATIONS VCC = full operating range; TA = TMIN to TMAX; VCC 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 SUPPLY Voltage Min Typ 1.0 1.
PAGE 4
ADM811/ADM812 Data Sheet ABSOLUTE MAXIMUM RATINGS −0.3 V to +6 V −0.3 V to VCC + 0.3 V Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; 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.
PAGE 5
Data Sheet ADM811/ADM812 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS 4 ADM811/ ADM812 VCC TOP VIEW RESET/RESET 2 (Not to Scale) 3 MR 00092-003 GND 1 Figure 3. Pin Configuration Table 3. Pin Function Descriptions Pin No. 1 2 Mnemonic GND RESET (ADM811) RESET (ADM812) 3 MR 4 VCC Description Ground Reference For All Signals, 0 V. Active Low Logic Output.
PAGE 6
ADM811/ADM812 Data Sheet TYPICAL PERFORMANCE CHARACTERISTICS 12 10 IDD @ VCC = 5.5V 9 10 7 8 IDD @ VCC = 3V IDD (µA) IDD (µA) IDD @ VCC = 5.
PAGE 7
Data Sheet ADM811/ADM812 CIRCUIT INFORMATION RESET THRESHOLDS A reset output is provided to the microprocessor whenever the VCC input is below the reset threshold. The actual reset threshold depends on whether an L, M, T, S, R, or Z suffix is used (see Table 4). Table 4. Reset Threshold Options Reset Threshold (V) 4.63 4.38 3.08 3.08 2.93 2.63 2.32 4.63 4.38 3.08 2.93 2.63 2.32 The ADM811 provides an active low reset output (RESET) while the ADM812 provides an active high output (RESET).
PAGE 8
ADM811/ADM812 Data Sheet INTERFACING TO OTHER DEVICES VCC OUTPUT The ADM811/ADM812 are designed to integrate with as many devices as possible. One feature of the ADM811/ADM812 is the reset output, which is directly proportional to VCC (this is guaranteed only while VCC is greater than 1 V). This enables the part to be used with both 3 V and 5 V, or any nominal voltage within the minimum and maximum specifications for VCC. VCC ADM811 GND 00092-011 RESET Figure 11.
PAGE 9
Data Sheet ADM811/ADM812 OUTLINE DIMENSIONS 3.04 2.90 2.80 1.92 BSC 0.20 BSC 4 1.40 1.30 1.20 3 1 2.64 2.10 2 1.72 REF 1.07 0.90 0.75 0.100 0.013 0.89 0.76 0.50 0.30 0.20 0.08 SEATING PLANE 8° 0° 0.54 REF 0.60 0.50 0.40 COMPLIANT TO JEDEC STANDARDS TO-253-AA Figure 12. 4-Lead Small Outline Transistor Package [SOT-143] (RA-4) Dimensions shown in millimeters Rev. G | Page 9 of 12 03-13-2012-B 1.22 0.
PAGE 10
ADM811/ADM812 Data Sheet ORDERING GUIDE Model 1, 2 ADM811LART-REEL ADM811LART-REEL7 ADM811LARTZ-REEL ADM811LARTZ-REEL7 ADM811MART-REEL7 ADM811MARTZ-REEL ADM811MARTZ-REEL7 ADM811TART-REEL7 ADM811TARTZ-REEL ADM811TARTZ-REEL7 ADM811-3TART-REEL7 ADM811-3TARTZ-RL ADM811-3TARTZ-RL7 ADM811SART-REEL ADM811SART-REEL7 ADM811SARTZ-REEL ADM811SARTZ-REEL7 ADM811RART-REEL7 ADM811RARTZ-REEL ADM811RARTZ-REEL7 ADM811ZART-REEL ADM811ZART-REEL7 ADM811ZARTZ-REEL ADM811ZARTZ-REEL7 ADM812LART-REEL7 ADM812LARTZ-REEL ADM812LARTZ
PAGE 11
Data Sheet ADM811/ADM812 NOTES Rev.