MAX811SEUS-T [ONSEMI]

1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO4, SOT-143, 4 PIN;


型号：	MAX811SEUS-T
厂家：	ONSEMI
描述：	1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO4, SOT-143, 4 PIN 光电二极管
文件：	总8页 (文件大小：52K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

MAX811, MAX812

4-Pin µP Reset Monitors

The MAX811 and MAX812 are cost–effective system supervisor

circuits designed to monitor V in digital systems and provide a reset

signal to the host processor when necessary. A manual reset input is

provided to override the reset monitor, and is suitable for use as a

push–button reset. No external components are required.

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The reset output is driven active within 20 µsec (4 µsec for

F version) of V falling through the reset voltage threshold. RESET

is maintained active for a minimum of 140 msec after V rises above

the reset threshold. The MAX812 has an active–high RESET output

while the MAX811 has an active–low RESET output. The output of

SOT–143

CASE 318A

the MAX811 is guaranteed valid down to V = 1 V. Both devices are

available in a 4–Pin SOT–143 package.

The MAX811/12 are optimized to reject fast transient glitches on

the V line. Low supply current of 7 µA (V = 3.3 V) makes these

devices suitable for battery powered applications.

PIN CONNECTIONS

Features

• Precision V Monitor for 1.8 V, 2.7 V, 3.0 V, 3.3 V, 5.0 V

GND

Nominal Supplies

• Manual Reset Input

• 140 msec Guaranteed Minimum RESET, RESET Output Duration

MAX811 (RESET)

MAX812 (RESET)

• RESET Output Guaranteed to V = 1.0 V (MAX811)

• Low 7 µA Supply Current

• V Transient Immunity

• Small SOT–143–4 Package

• No External Components

ORDERING INFORMATION

See detailed ordering and shipping information in the package

dimensions section on page 6 of this data sheet.

Typical Applications

• Computers

• Embedded Systems

DEVICE MARKING INFORMATION

See general marking information in the device marking

section on page 6 of this data sheet.

• Battery Powered Equipment

• Critical µP Power Supply Monitoring

PROCESSOR

RESET

INPUT

PUSH–

BUTTON

(ACTIVE LOW)

MAX811

GND

Typical Operating Circuit

Semiconductor Components Industries, LLC, 2001

Publication Order Number:

January, 2001 – Rev. 3

MAX811/D

MAX811, MAX812

ABSOLUTE MAXIMUM RATINGS*

Rating

Symbol

Value

Unit

Supply Voltage (V to GND)

–

+6.0

RESET, RESET

–0.3 to (V +0.3)

Input Current, V

°C

Output Current, RESET, RESET

Operating Temperature Range

Storage Temperature Range

–40 to +85

–65 to +150

+260

stg

Lead Temperature (Soldering, 10 sec)

–

*This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational

sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

ELECTRICAL CHARACTERISTICS (V = 5 V for L/M versions, V = 3.3 V for T/S versions, V = 3 V for R version,

= 2.0 V for F version. T = –40°C to +85°C unless otherwise noted. Typical values are at T = +25°C.) (Note 1.)

Characteristics

Range

Test Conditions

Symbol

Min

Typ

Max

Unit

–

1.2

–

5.5

Supply Current

u V , for L, M, R, S, T, F

–

7.0

6.0

µA

t V , for L, M, R, S, T

t V , for F

Reset Threshold

MAX81_L: T = +25°C

4.54

4.50

4.30

4.25

3.03

3.00

2.88

2.85

2.58

2.55

1.71

1.70

4.63

–

4.38

–

3.08

–

2.93

–

2.63

–

1.75

–

4.72

4.75

4.46

4.50

3.14

3.15

2.98

3.00

2.68

2.70

1.79

1.80

T = –40°C to +85°C

MAX81_M: T = +25°C

T = –40°C to +85°C

MAX81_T: T = +25°C

T = –40°C to +85°C

MAX81_S: T = +25°C

T = –40°C to +85°C

MAX81_R: T = +25°C

T = –40°C to +85°C

MAX81_F: T = +25°C

T = –40°C to +85°C

Reset Threshold Tempco

–

ppm/°C

µsec

to Reset Delay

= V to V –125 mV;

L, M, R, S, T, F

–

5.0

–

Reset Active Timeout Period

MR Minimum Pulse Width

MR Glitch Immunity

= V

140

–

280

–

560

–

msec

µsec

TH(MAX)

–

tMR

–

0.1

0.5

–

MR to Reset Propagation Delay

MR Input Threshold

–

u V

2.3

–

0.8

TH(MAX)

MAX81_L/M

–

u V

0.7 V

–

TH(MAX)

MAX81_R/S/T/F

–

0.15 V

MR Pull–up Resistance

–

KΩ

RESET Output Voltage High

(MAX812)

= 150 µA;

v V

0.8 V

SOURCE

TH(MIN)

1. Production testing done at T = +25°C, over temperature limits guaranteed by design.

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MAX811, MAX812

ELECTRICAL CHARACTERISTICS (continued) (V = 5 V for L/M versions, V = 3.3 V for T/S versions, V = 3 V for R version,

= 2.0 V for F version. T = –40°C to +85°C unless otherwise noted. Typical values are at T = +25°C.) (Note 1.)

Characteristics

Symbol

Test Conditions

Min

Typ

Max

Unit

RESET Output Voltage Low

(MAX812)

MAX812F only, I

= 500 µA,

–

0.2

SINK

= V

TH(MAX)

MAX812R/S/T only, I

= 1.2 mA,

–

0.3

0.4

SINK

= V

TH(MAX)

MAX812L/M only, I

= 3.2 mA,

SINK

= V

TH(MAX)

RESET Output Voltage Low

(MAX811)

MAX811R/S/T only, I

= 1.2 mA,

–

0.3

SINK

= V

TH(MIN)

MAX811F only, I

= 500 µA,

SINK

= V

TH(MIN)

MAX811L/M only, I

= 3.2 mA,

–

0.4

SINK

= V

TH(MIN)

= 50 µA, V u 1.0 V

MAX811L/M only,

–

TBD

–

SINK

RESET Output Voltage High

(MAX811)

–1.5

= 800 µA,

SOURCE

u V

TH(MAX)

MAX811R/S/T/F only,

0.8 V

–

= 500 µA,

SOURCE

u V

TH(MAX)

1. Production testing done at T = +25°C, over temperature limits guaranteed by design.

2. RESET output for MAX811, RESET output for MAX812.

PIN DESCRIPTION

Number

Symbol

GND

Description

Ground

RESET output remains low while V is below the reset voltage threshold, and for at least

RESET (MAX811)

140 msec min. after V rises above reset threshold.

RESET (MAX812)

RESET output remains high while V is below the reset voltage threshold, and for at least

140 msec min. after V rises above reset threshold.

Manual Reset input generates a reset when MR is below V .

Supply voltage

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MAX811, MAX812

APPLICATIONS INFORMATION

will be suitable for most applications). Similarly, a pull–up

resistor to V is required for the MAX812 to ensure a valid

V_CCTransient Rejection

high RESET for V below 1.1 V.

The MAX811/12 provides accurate V monitoring and

reset timing during power–up, power–down, and

brownout/sag conditions, and rejects negative–going

transients (glitches) on the power supply line. Figure 1

shows the maximum transient duration vs. maximum

negative excursion (overdrive) for glitch rejection. Any

combination of duration and overdrive that lays under the

curve will not generate a reset signal. Combinations above

the curve are detected as a brownout or power–down.

Transient immunity can be improved by adding a capacitor

MAX811

RESET

in close proximity to the V pin of the MAX811/12.

100 K

GND

Overdrive

Figure 2. Ensuring RESET Valid to V_CC= 0 V

Duration

Processors with Bidirectional I/O Pins

400

320

240

160

Some µP’s (such as Motorola’s 68HC11) have

bi–directional reset pins. Depending on the current drive

capability of the processor pin, an indeterminate logic level

may result if there is a logic conflict. This can be avoided by

adding a 4.7 kΩ resistor in series with the output of the

MAX811/12 (Figure 3). If there are other components in the

system which require a reset signal, they should be buffered

so as not to load the reset line. If the other components are

required to follow the reset I/O of the µP, the buffer should

be connected as shown with the solid line.

T = +25°C

MAX811/12

BUFFERED

RESET TO

100

1000

BUFFER

OTHER

Reset Comparator Overdrive, [V

–V ](mV)

CCTP

SYSTEM

COMPONENTS

Figure 1. Maximum Transient Duration vs.

Overdrive for Glitch Rejection at 25°C

RESET Signal Integrity During Power–Down

The MAX811 RESET output is valid to V = 1.0 V.

MAX811

m P

4.7 K

Below this voltage the output becomes an “open circuit’’ and

does not sink current. This means CMOS logic inputs to the

µP will be floating at an undetermined voltage. Most digital

systems are completely shutdown well above this voltage.

However, in situations where RESET must be maintained

RESET

GND

RESET

GND

valid to V = 0 V, a pull–down resistor must be connected

from RESET to ground to discharge stray capacitances and

hold the output low (Figure 2). This resistor value, though

not critical, should be chosen such that it does not

appreciably load RESET under normal operation (100 kΩ

Figure 3. Interfacing to Bidirectional Reset I/O

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MAX811, MAX812

TYPICAL CHARACTERISTICS

= 5 V

= 3 V

= 1 V

–40

–20

–40

–20

Temperature (°C)

Figure 4. Supply Current vs. Temperature

(No Load, MAX81xR/S/T/F)

Figure 5. Supply Current vs. Temperature

(No Load, MAX81xL/M)

= 20 mV

L/M

= 100 mV

= 200 mV

= 20 mV

R/S/T

= 200 mV

= 20 mV

= 100 mV

–40

–20

–40

–20

Temperature (°C)

Figure 6. Power–Down Reset Delay vs.

Temperature (MAX81xF)

Figure 7. Power–Down Reset Delay vs.

Temperature (MAX81xL/M/R/S/T)

1.003

1.002

1.001

250

245

MAX81xL/M

1.000

0.999

0.998

0.997

240

235

MAX81xR/S/T/F

0.996

0.995

0.994

230

225

–40

–15

–40

–20

Temperature (°C)

Figure 8. Power–Up Reset Timeout vs.

Temperature

Figure 9. Normalized Reset Threshold vs.

Temperature

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MAX811, MAX812

MARKING DIAGRAM

= Part Number Code and

and

Temperature Range (two–digit code)

= Year and Quarter Code

= Lot ID Number

ORDERING INFORMATION

Threshold

Voltage

Marking

Package

(Qty/Reel)

and

Device

MAX811LEUS–T*

MAX811MEUS–T*

MAX811TEUS–T

MAX811SEUS–T*

MAX811REUS–T*

MAX811FEUS–T

4.63

4.38

3.08

2.93

2.63

1.75

3000 Units Tape and Reel

MAX812LEUS–T*

MAX812MEUS–T*

MAX812TEUS–T

MAX812SEUS–T*

MAX812REUS–T*

MAX812FEUS–T

4.63

4.38

3.08

2.93

2.63

1.75

*Default: Contact your ON Semiconductor sales representative for other threshold voltage options.

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MAX811, MAX812

PACKAGE DIMENSIONS

SOT–143

CASE 318A–05

ISSUE R

NOTES:

1. DIMENSIONING AND TOLERANCING PER ANSI

Y14.5M, 1982.

2. CONTROLLING DIMENSION: MILLIMETER.

MILLIMETERS

INCHES

MIN

0.110

DIM MIN

MAX

0.120

0.055

0.045

0.020

0.037

0.080

0.004

0.006

0.024

0.033

0.098

2.80

1.20

0.84

0.39

0.79

1.78

0.013

0.08

0.46

0.445

0.72

2.11

3.04

1.39 0.047

1.14 0.033

0.50 0.015

0.93 0.031

2.03 0.070

0.10 0.0005

0.15 0.003

0.60 0.018

0.60 0.0175

0.83 0.028

2.48 0.083

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MAX811, MAX812

ON Semiconductor and

are trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes

without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular

purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability,

including without limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets and/or

specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be

validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights nor the rights of others.

SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications

intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or

death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold

SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable

attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim

alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer.

PUBLICATION ORDERING INFORMATION

NORTH AMERICA Literature Fulfillment:

CENTRAL/SOUTH AMERICA:

Literature Distribution Center for ON Semiconductor

P.O. Box 5163, Denver, Colorado 80217 USA

Spanish Phone: 303–308–7143 (Mon–Fri 8:00am to 5:00pm MST)

Email: ONlit–spanish@hibbertco.com

Phone: 303–675–2175 or 800–344–3860 Toll Free USA/Canada

Fax: 303–675–2176 or 800–344–3867 Toll Free USA/Canada

Email: ONlit@hibbertco.com

Toll–Free from Mexico: Dial 01–800–288–2872 for Access –

then Dial 866–297–9322

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Phone: 303–675–2121 (Tue–Fri 9:00am to 1:00pm, Hong Kong Time)

Toll Free from Hong Kong & Singapore:

Fax Response Line: 303–675–2167 or 800–344–3810 Toll Free USA/Canada

N. American Technical Support: 800–282–9855 Toll Free USA/Canada

001–800–4422–3781

EUROPE: LDC for ON Semiconductor – European Support

German Phone: (+1) 303–308–7140 (Mon–Fri 2:30pm to 7:00pm CET)

Email: ONlit–german@hibbertco.com

French Phone: (+1) 303–308–7141 (Mon–Fri 2:00pm to 7:00pm CET)

Email: ONlit–french@hibbertco.com

Email: ONlit–asia@hibbertco.com

JAPAN: ON Semiconductor, Japan Customer Focus Center

4–32–1 Nishi–Gotanda, Shinagawa–ku, Tokyo, Japan 141–0031

Phone: 81–3–5740–2700

Email: r14525@onsemi.com

English Phone: (+1) 303–308–7142 (Mon–Fri 12:00pm to 5:00pm GMT)

Email: ONlit@hibbertco.com

ON Semiconductor Website: http://onsemi.com

EUROPEAN TOLL–FREE ACCESS*: 00–800–4422–3781

For additional information, please contact your local

Sales Representative.

*Available from Germany, France, Italy, UK, Ireland

MAX811/D

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MAX811SEUS-T [ONSEMI]

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