ADM811RARTZ-REEL7中文资料应用文章市场行情现货热卖使用介绍-中国IC网-芯三七

Microprocessor Supervisory

Circuit in 4-Lead SOT-143 with DSP

ADM811/ADM812

Data Sheet

FEATURES

FUNCTIONAL BLOCK DIAGRAM

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

ADM811/ADM812

V

CC

RESET

GENERATOR

RESET/RESET

GND

V

REF

MR

DEBOUNCE

Power-on reset: 140 ms minimum

RESET

Logic low

output (ADM811)

Figure 1.

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 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.

V

CC

ADM811

MICROPROCESSOR

SYSTEM

MR

RESET

GND

RESET

100kΩ

GND

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.

Figure 2. Typical ADM811 Operating Circuit

Rev. G

Document Feedback

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

rightsof third parties that may result fromits use. Specifications subject to change without notice. No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarks andregisteredtrademarks are the property of their respective owners.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

Technical Support

www.analog.com

ADM811/ADM812

Data Sheet

TABLE OF CONTENTS

Features .............................................................................................. 1

Reset Thresholds ...........................................................................7

Reset Output ..................................................................................7

Manual Reset..................................................................................7

Glitch Immunity............................................................................7

Interfacing to Other Devices............................................................8

Output.............................................................................................8

Benefits of a Very Accurate Reset Threshold ............................8

Applications....................................................................................... 1

Functional Block Diagram .............................................................. 1

General Description ......................................................................... 1

Revision History ............................................................................... 2

Specifications..................................................................................... 3

Absolute Maximum Ratings............................................................ 4

ESD Caution.................................................................................. 4

Pin Configuration and Function Descriptions............................. 5

Typical Performance Characteristics ............................................. 6

Circuit Information.......................................................................... 7

RESET

Ensuring a Valid

/Reset Output Down to V_CC= 0 V....8

Outline Dimensions..........................................................................9

Ordering Guide .......................................................................... 10

REVISION HISTORY

3/13—Rev. F to Rev. G

1/03—Rev. A to Rev. B

Changes to Pin 4 Description; Table 3........................................... 5

Updated Outline Dimensions......................................................... 9

Changes to Ordering Guide .......................................................... 10

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

8/09—Rev. E to Rev. F

Changes to Ordering Guide .......................................................... 10

5/08—Rev. D to Rev. E

Changes to Table 2 ............................................................................ 4

Changes to Outline Dimensions..................................................... 9

Changes to Ordering Guide .......................................................... 10

5/02—Rev. 0 to Rev. A

Deletion of ADM812..........................................................Universal

5/06—Rev. C to Rev. D

Changes to Ordering Guide ............................................................ 9

2/03—Rev. B to Rev. C

Changes Features .............................................................................. 1

Changes to General Description .................................................... 1

Changes to Specifications................................................................ 2

Removed Note 2 from Ordering Guide......................................... 3

Changes to Pin Function Descriptions.......................................... 4

Removed Note from Table I ........................................................... 6

Rev. G | Page 2 of 12

Data Sheet

ADM811/ADM812

SPECIFICATIONS

V_CC= full operating range; T_A= T_MINto T_MAX; V_CCtypical = 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

1.2

5.5

V

T_A= 0°C to 70°C

T_A= −40°C to +85°C

Current

8

5

15

10

µA

V_CC< 5.5 V, ADM81xL/M, I_OUT= 0 mA

V_CC< 3.6 V, ADM81xR/S/T/Z, I_OUT= 0 mA

RESET VOLTAGE THRESHOLD

ADM81xL

ADM81xM

ADM81xT

ADM81xS

ADM81xR

ADM81xZ

4.54

4.50

4.30

4.25

3.03

3.00

2.88

2.85

2.58

2.55

2.28

2.25

4.63

4.38

3.08

2.93

2.63

2.32

4.72

4.75

4.46

4.50

3.14

3.15

2.98

3.00

2.68

2.70

2.35

2.38

V

T_A= 25°C

T_A= −40°C to +85°C

T_A= 25°C

T_A= −40°C to +85°C

T_A= 25°C

T_A= −40°C to +85°C

T_A= 25°C

T_A= −40°C to +85°C

T_A= 25°C

T_A= −40°C to +85°C

T_A= 25°C

T_A= −40°C to +85°C

RESET THRESHOLD TEMPERATURE COEFFICIENT

V_CCTO RESET/RESET DELAY

30

40

20

ppm/°C

µs

V_OD= 125 mV, ADM81xL/M

V_OD= 125 mV, ADM81xR/S/T/Z

V_CC= V_TH(MAX)

µs

RESET ACTIVE TIMEOUT PERIOD

140

300

560

700

ms

ADM811-3T only

MANUAL RESET

Minimum Pulse Width

Glitch Immunity

RESET/RESET Propagation Delay

Pull-Up Resistance

10

µs

ns

µs

kΩ

100

0.5

20

10

30

The Manual Reset Circuit Acts On

An Input Rising Above

An Input Falling Below

An Input Rising Above

An Input Falling Below

RESET/RESET Output Voltage

Low (ADM812R/S/T/Z)

Low (ADM812L/M)

High (ADM812R/S/T/Z/L/M)

Low (ADM811R/S/T/Z)

Low (ADM811L/M)

Low (ADM811R/S/T/Z/L/M)

High (ADM811R/S/T/Z)

High (ADM811L/M)

2.3

V

V_CC> V_TH(MAX), ADM81xL/M

V_CC> V_TH(MAX), ADM81xR/S/T/Z

0.8

0.7 × V_CC

0.25 × V_CC

0.3

0.4

V

V_CC= V_TH(MAX), I_SINK= 1.2 mA

V_CC= V_TH(MAX), I_SINK= 3.2 mA

1.8 V < V_CC< V_TH(MIN), I_SOURCE= 150 µA

V_CC= V_TH(MIN),I_SINK= 1.2 mA

V_CC= V_TH(MIN), I_SINK= 3.2 mA

V_CC> 1.0 V, I_SINK= 50 µA

0.8 × V_CC

0.3

0.4

0.3

0.8 × V_CC

V_CC× 1.5

V_CC> V_TH(MAX), I_SOURCE= 500 µA

V_CC> V_TH(MAX), I_SOURCE= 800 µA

Rev. G | Page 3 of 12

ADM811/ADM812

Data Sheet

ABSOLUTE MAXIMUM RATINGS

Typical values are at T_A= 25°C, unless otherwise noted.

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.

Table 2.

Parameter

Rating

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

MR

20 mA

ESD CAUTION

Output Current

RESET

20 mA

Power Dissipation (T_A= 70°C)

RA-4 (SOT-143)

200 mW

Derate by 4 mW/°C Above 70°C

θ_JAThermal Impedance

Operating Temperature Range

Storage Temperature Range

Lead Temperature (Soldering, 10 sec)

Vapor Phase (60 sec)

Infrared (15 sec)

330°C/W

−40°C to +85°C

−65°C to +160°C

300°C

215°C

220°C

ESD Rating

3 kV

Rev. G | Page 4 of 12

Data Sheet

ADM811/ADM812

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

GND

1

4

V

CC

ADM811/

ADM812

TOP VIEW

(Not to Scale)

RESET/RESET

2

3

MR

Figure 3. Pin Configuration

Table 3. Pin Function Descriptions

Pin No.

Mnemonic

Description

1

2

GND

RESET

Ground Reference For All Signals, 0 V.

Active Low Logic Output. RESET remains low while V_CCis below the reset threshold or when MR is low;

RESET then remains low for at least 140 ms (at least 300 ms for the ADM811-3T) after V_CCrises above the

reset threshold.

(ADM811)

RESET (ADM812)

Active High Logic Output. RESET remains high while V_CCis below the reset threshold or when MR is low;

RESET then remains high for 240 ms (typical) after V_CCrises above the reset threshold.

3

4

MR

V_CC

Manual Reset. This active low debounced input ignores input pulses of 100 ns or less (typical) and is

guaranteed to accept input pulses of greater than 10 µs. Leave floating when not used.

Monitored Supply Voltage of 2.5 V, 3 V, 3.3 V, or 5 V. A 0.1 µF decoupling capacitor between V_CCand the

GND pin is recommended.

Rev. G | Page 5 of 12

ADM811/ADM812

Data Sheet

TYPICAL PERFORMANCE CHARACTERISTICS

12

10

9

8

7

6

5

4

3

2

1

0

I

@ V = 5.5V

CC

DD

I

@ V = 5.5V

CC

10

DD

8

I

@ V = 3V

CC

DD

I

@ V = 3V

CC

DD

6

4

I

@ V = 1V

CC

DD

2

I

@ V = 1V

CC

DD

0

–40

–20

0

20

30

50

70

85

100

120

–40

–20

0

20

30

50

70

85

100

120

TEMPERATURE (°C)

Figure 4. Supply Current vs. Temperature (ADM81xR/S/T/Z)

Figure 7. Supply Current vs. Temperature (ADM81xL/M)

1000

900

800

700

600

500

400

300

200

100

0

800

700

600

500

400

300

200

100

0

V

= 20mV

OD

V

= 20mV

OD

V

= 125mV

OD

V

= 200mV

20

OD

V

= 125mV

OD

V

= 200mV

OD

–40

–20

0

30

50

70

85

100

120

–40

–20

0

20

30

50

70

85

100

120

TEMPERATURE (°C)

RESET

Delay vs. Temperature (ADM81xL/M)

Figure 5. Power-Down

Delay vs. Temperature (ADM81xR/S/T/Z)

Figure 8. Power-Down

299

294

279

274

269

264

259

254

249

244

1.007

1.006

1.005

1.004

1.003

1.002

1.001

1.000

0.999

0.998

0.997

0.996

0.995

ADM81xL/M

ADM81xR/S/T/Z

–40

–20

0

20

30

50

70

85

100

120

–40

–20

0

20

30

50

70

85

100

120

TEMPERATURE (°C)

Figure 9. RESET Threshold Deviation vs. Temperature

Figure 6. Power-Up RESET Timeout vs. Temperature

Rev. G | Page 6 of 12

Data Sheet

ADM811/ADM812

CIRCUIT INFORMATION

This allows time for the power supply and microprocessor to

stabilize.

RESET THRESHOLDS

A reset output is provided to the microprocessor whenever the

RESET

The ADM811 provides an active low reset output (

while the ADM812 provides an active high output (RESET).

RESET

)

V

_CCinput 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).

During power-down of the ADM811, the

output

remains valid (low) with V_CCas low as 1 V. This ensures that

the microprocessor is held in a stable shutdown condition as

the supply falls and also ensures that no spurious activity can

occur via the microprocessor as it powers up.

Table 4. Reset Threshold Options

Model

Reset Threshold (V)

ADM811LART

ADM811MART

ADM811TART

ADM811-3TART

ADM811SART

ADM811RART

ADM811ZART

ADM812LART

ADM812MART

ADM812TART

ADM812SART

ADM812RART

ADM812ZART

4.63

4.38

3.08

2.93

2.63

2.32

4.63

4.38

3.08

2.93

2.63

2.32

MANUAL RESET

The ADM811/ADM812 are equipped with a manual reset

input. This input is designed to operate in a noisy environment

where unwanted glitches could be induced. These glitches could

be produced by the bouncing action of a switch contact, or where a

manual reset switch may be located some distance away from

the circuit (the cabling of which can pick up noise).

The manual reset input is guaranteed to ignore logically valid

inputs that are faster than 100 ns and to accept inputs longer in

duration than 10 µs.

GLITCH IMMUNITY

The ADM811/ADM812 contain internal filtering circuitry

providing glitch immunity from fast transient glitches on the

power supply line.

RESET OUTPUT

On power-up and after V_CCrises above the reset threshold, an

internal timer holds the reset output active for 240 ms (typical).

This is intended as a power-on reset signal for the processor. It

allows time for both the power supply and the microprocessor

to stabilize after power-up. If a power supply brownout or

interruption occurs, the reset output is similarly activated and

remains active for 240 ms (typical) after the supply recovers.

V

REF

V

REF

CC

t₁

RESET

t₁= RESET TIME = 250ms TYPICAL

= RESET VOLTAGE THRESHOLD

V

REF

RESET

Figure 10. Power Fall

Timing

Rev. G | Page 7 of 12

ADM811/ADM812

Data Sheet

INTERFACING TO OTHER DEVICES

V

CC

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 V_CC(this is guar-

anteed only while V_CCis greater than 1 V). This enables the part

to be used with both 3 V and 5 V, or any nominal voltage within

ADM811

RESET

GND

the minimum and maximum specifications for V_CC

.

RESET

Figure 11. Ensuring a Valid

Output Down to V_CC= 0 V

BENEFITS OF A VERY ACCURATE RESET

THRESHOLD

Because the ADM811/ADM812 can operate effectively even

when there are large degradations of the supply voltages, the

possibility of a malfunction during a power failure is greatly

reduced. Another advantage of the ADM811/ADM812 is its

very accurate internal voltage reference circuit. Combined,

these benefits produce an exceptionally reliable microprocessor

supervisory circuit.

ENSURING A VALID RESET/RESET

OUTPUT DOWN TO V_CC= 0 V

RESET

When V_CCfalls below 0.8 V, the

/RESET of the ADM811/

ADM812 no longer sinks current. Therefore, a high impedance

RESET

CMOS logic input connected to

undetermined logic levels. To eliminate this problem, a 100 kΩ

RESET

/RESET can drift to

resistor should be connected from

/RESET to ground.

Rev. G | Page 8 of 12

Data Sheet

ADM811/ADM812

OUTLINE DIMENSIONS

3.04

2.90

2.80

1.92 BSC

0.20

BSC

2.64

2.10

4

3

2

1.40

1.30

1.20

1

1.72 REF

1.07

0.90

0.75

1.22

0.80

0.20

0.08

0.100

0.013

8°

0°

0.60

0.50

0.40

0.89

0.76

0.50

0.30

SEATING

PLANE

0.54 REF

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

ADM811/ADM812

Data Sheet

ORDERING GUIDE

Reset

Threshold (V)

Temperature

Range

Ordering

Quantity

Package

Description

Package

Model^{1, 2}

Option

RA-4

Branding

MBV

M4J

MBT

MBT #

MBG

MBG #

MB3

M4E

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-REEL7

ADM812MART-REEL

ADM812MART-REEL7

ADM812MARTZ-REEL

ADM812MARTZ-REEL7

ADM812TART-REEL7

ADM812TARTZ-REEL

ADM812TARTZ-REEL7

ADM812SART-REEL

ADM812SART-REEL7

ADM812SARTZ-REEL

ADM812SARTZ-REEL7

ADM812RART-REEL7

ADM812RARTZ-REEL

ADM812RARTZ-REEL7

ADM812ZART-REEL

ADM812ZART-REEL7

ADM812ZARTZ-REEL

ADM812ZARTZ-REEL7

4.63

4.38

3.08

2.93

2.63

2.32

4.63

4.38

3.08

2.93

2.63

2.32

–40°C to +85°C

10,000

3,000

10,000

3,000

10,000

3,000

10,000

3,000

10,000

3,000

10,000

3,000

10,000

3,000

10,000

3,000

10,000

3,000

10,000

3,000

10,000

3,000

10,000

3,000

10,000

3,000

10,000

3,000

10,000

3,000

10,000

3,000

10,000

3,000

10,000

3,000

10,000

3,000

4-Lead SOT-143

M4E

MBE

MBE #

MBB

M4N

MBZ

M6G

MCV

M5D

MCT

M6D

MCG

M68

MCE

M67

MCB

M6F

MCZ

M69

¹Available only in reels.

²Z = RoHS Compliant Part. RoHS-compliant parts may have # branded on either the top or bottom of the device.

Rev. G | Page 10 of 12

Data Sheet

NOTES

ADM811/ADM812

Rev. G | Page 11 of 12

ADM811/ADM812

NOTES

Data Sheet

registered trademarks are the property of their respective owners.

D00092-0-3/13(G)

Rev. G | Page 12 of 12

型号:	ADM811RARTZ-REEL7
是否无铅：	不含铅
是否Rohs认证：	符合
生命周期：	Active
IHS 制造商：	ROCHESTER ELECTRONICS INC
零件包装代码：	SOT-143
包装说明：	LSOP,
针数：	4
Reach Compliance Code：	unknown
风险等级：	5.11
Is Samacsys：	N
其他特性：	RESET THRESHOLD VOLTAGE IS 2.63V; BUILT-IN MANUAL RESET
可调阈值：	NO
模拟集成电路 - 其他类型：	POWER SUPPLY SUPPORT CIRCUIT
JESD-30 代码：	R-PDSO-G4
JESD-609代码：	e3
长度：	2.9 mm
湿度敏感等级：	1
信道数量：	1
功能数量：	1
端子数量：	4
最高工作温度：	85 °C
最低工作温度：	-40 °C
封装主体材料：	PLASTIC/EPOXY
封装代码：	LSOP
封装形状：	RECTANGULAR
封装形式：	SMALL OUTLINE, LOW PROFILE
峰值回流温度（摄氏度）：	260
座面最大高度：	1.22 mm
最大供电电压 (Vsup)：	5.5 V
最小供电电压 (Vsup)：	1 V
标称供电电压 (Vsup)：	3 V
表面贴装：	YES
温度等级：	INDUSTRIAL
端子面层：	MATTE TIN
端子形式：	GULL WING
端子节距：	1.92 mm
端子位置：	DUAL
处于峰值回流温度下的最长时间：	40
宽度：	1.3 mm
Base Number Matches：	1

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