Analog Devices ADM811 2 c Datasheet

Microprocessor Supervisory

DEBOUNCE

RESET/RESET

GND

V

CC

V

REF

ADM811/ADM812

RESET

GENERATOR

MR

Circuit in 4-Lead SOT-143

ADM811/ADM812

FEATURES
Superior Upgrade for MAX811/MAX812
Specified over Temperature
Low Power Consumption (5 ␮A Typ)
Precision Voltage Monitor: 2.5 V, 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 is a reliable voltage monitoring device
suitable for use in most voltage monitoring applications. The
ADM811/ADM812 is designed to monitor six 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 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 is 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.

FUNCTIONAL BLOCK DIAGRAM

MR

V

CC

ADM811

GND

MICROPROCESSOR

RESET

100k⍀

RESET

V

SYSTEM

GND

CC

Figure 1. Typical ADM811 Operating Circuit

REV. C

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reliable. However, no responsibility is assumed by Analog Devices for its
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may result from its use. No license is granted by implication or otherwise
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Tel: [phone] www.analog.com
Fax: [phone] © 2003 Analog Devices, Inc. All rights reserved.

ADM811/ADM812–SPECIFICATIONS

(VCC = Full Operating Range; TA = T

3.3 V for T/S, 3 V for R, 2.5 V for Z Models; unless otherwise noted.)

MIN

to T

; VCC typ = 5 V for L/M,

MAX

Parameter Min Typ Max Unit Test Conditions/Comments

SUPPLY

Voltage 1.0 5.5 V T

1.2 V T

Current 8 15 µAV

510 µAV

= 0°C to 70°C

A

= –40°C to +85°C

A

< 5.5 V, ADM81_L/M, I

CC

< 3.6 V, ADM81_R/S/T/Z, I

CC

OUT

RESET VOLTAGE THRESHOLD

ADM81_L 4.54 4.63 4.72 V T
ADM81_L 4.50 4.75 V T
ADM81_M 4.30 4.38 4.46 V T
ADM81_M 4.25 4.50 V T
ADM81_T 3.03 3.08 3.14 V T
ADM81_T 3.00 3.15 V T
ADM81_S 2.88 2.93 2.98 V T
ADM81_S 2.85 3.00 V T
ADM81_R 2.58 2.63 2.68 V T
ADM81_R 2.55 2.70 V T
ADM81_Z 2.28 2.32 2.35 V T

= 25°C

A

= –40°C to +85°C

A

= 25°C

A

= –40°C to +85°C

A

= 25°C

A

= –40°C to +85°C

A

= 25°C

A

= –40°C to +85°C

A

= 25°C

A

= –40°C to +85°C

A

= 25°C

A

ADM81_Z 2.25 2.38 V TA = –40°C to +85°C

RESET THRESHOLD

TEMPERATURE COEFFICIENT 30 ppm/°C

TO RESET/RESET DELAY 40 µsV

V

CC

20 µsV

RESET ACTIVE TIMEOUT PERIOD 140 560 ms V

= 125 mV, ADM81_L/M

OD

= 125 mV, ADM81_R/S/T/Z

OD

= V

CC

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
An Input Falling Below 0.8 V V
An Input Rising Above 0.7 ⫻ V

CC

VV

An Input Falling Below 0.25 ⫻ VCCVV

CC

CC

CC

CC

> V
> V
> V
> V

TH(MAX),

TH(MAX),

TH(MAX),

TH(MAX),

ADM81_L/M
ADM81_L/M
ADM81_R/S/T/Z
ADM81_R/S/T/Z

RESET/RESET Output Voltage

Low (ADM812R/S/T/Z) 0.3 V V
Low (ADM812L/M) 0.4 V V
High (ADM812R/S/T/Z/L/M) 0.8 ⫻ V

CC

V 1.8 V < VCC < V
Low (ADM811R/S/T/Z) 0.3 V V
Low (ADM811L/M) 0.4 V V
Low (ADM811R/S/T/Z/L/M) 0.3 V V
High (ADM811R/S/T/Z) 0.8 ⫻ V
High (ADM811L/M) V

Specifications subject to change without notice.

CC

– 1.5 V VCC > V

CC

VV

= V

CC

= V

CC

= V

CC

= V

CC

> 1.0 V, I

CC

> V

CC

TH(MAX)

TH(MAX)

TH(MIN)

TH(MIN)

TH(MAX)

TH(MAX)

, I
, I

TH(MIN)

, I

SINK

, I

SINK

SINK

, I
, I

= 1.2 mA

SINK

= 3.2 mA

SINK

, I
= 1.2 mA
= 3.2 mA

= 50 µA

SOURCE

SOURCE

SOURCE

= 500 µA
= 800 µA

= 0 mA

= 0 mA

OUT

= 150 µA

REV. C–2–

ADM811/ADM812

ABSOLUTE MAXIMUM RATINGS*

(Typical values are at TA = 25°C, unless otherwise noted.)

Terminal Voltage (With Respect to Ground)

V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +6 V

CC

All Other Inputs . . . . . . . . . . . . . . . . . –0.3 V to V

+ 0.3 V

CC

Input Current

V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 mA

CC

MR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 mA

Output Current

RESET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 mA

Power Dissipation (T

= 70°C)

A

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.

RT-4, (SOT-143) . . . . . . . . . . . . . . . . . . . . . . . . . . 200 mW

Derate by 4 mW/°C above 70°C

Thermal Impedance . . . . . . . . . . . . . . . . . . . . . 330°C/W

θ

JA

ORDERING GUIDE

Reset Temperature Branding

Model* Threshold (V) Range Information Quantity (K)

ADM811LART-REEL 4.63 –40°C to +85°C MBV 10
ADM811LART-REEL-7 4.63 –40°C to +85°C MBV 3
ADM811MART-REEL 4.38 –40°C to +85°C MBT 10
ADM811MART-REEL-7 4.38 –40°C to +85°C MBT 3
ADM811TART-REEL 3.08 –40°C to +85°C MBG 10
ADM811TART-REEL-7 3.08 –40°C to +85°C MBG 3
ADM811-3TART-REEL 3.08 –40°C to +85°CMB3 10
ADM811-3TART-REEL-7 3.08 –40°C to +85°CMB3 3
ADM811SART-REEL 2.93 –40°C to +85°C MBE 10
ADM811SART-REEL-7 2.93 –40°C to +85°C MBE 3
ADM811RART-REEL 2.63 –40°C to +85°CMBB 10
ADM811RART-REEL-7 2.63 –40°C to +85°CMBB 3
ADM811ZART-REEL 2.32 –40°C to +85°C MBZ 10
ADM811ZART-REEL-7 2.32 –40°C to +85°C MBZ 3
ADM812LART-REEL 4.63 –40°C to +85°C MCV 10
ADM812LART-REEL-7 4.63 –40°C to +85°C MCV 3
ADM812MART-REEL 4.38 –40°C to +85°C MCT 10
ADM812MART-REEL-7 4.38 –40°C to +85°C MCT 3
ADM812TART-REEL 3.08 –40°C to +85°C MCG 10
ADM812TART-REEL-7 3.08 –40°C to +85°C MCG 3
ADM812SART-REEL 2.93 –40°C to +85°C MCE 10
ADM812SART-REEL-7 2.93 –40°C to +85°C MCE 3
ADM812RART-REEL 2.63 –40°C to +85°CMCB 10
ADM812RART-REEL-7 2.63 –40°C to +85°CMCB 3
ADM812ZART-REEL 2.32 –40°C to +85°C MCZ 10
ADM812ZART-REEL-7 2.32 –40°C to +85°C MCZ 3

*Only available in reels.

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
ADM811/ADM812 feature 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. C

–3–