MAX6808UR36-T中文资料_数据手册_规格书

19-1421; Rev 1; 4/99

Vo lt a g e De t e c t o rs

7/MAX608

Ge n e ra l De s c rip t io n

Fe a t u re s

The MAX6806/MAX6807/MAX6808 precision voltage

detectors are ideal for accurate monitoring of power

supplies in digital systems. They provide circuit reliabili-

ty and reduce total cost by eliminating external compo-

nents and adjustments.

♦ Preset Reset Thresholds: 4.6V and 2.6V

(2.3V also available for MAX6806 only)

♦ ±2% Accurate Reset Thresholds

♦ Reset Output Available in Active-Low (MAX6806),

Active-High (MAX6807), and Open-Drain

(MAX6808) Versions

The MAX6806/MAX6807/MAX6808 assert a reset signal

whenever the supply voltage (V ) falls below the factory-

CC

preset, ±2% accurate threshold. Internal hysteresis

e ns ure s s ta b le s witc hing . The MAX6806/MAX6807/

MAX6808 are available in 4.6V and 2.6V thresholds (2.3V

is also available for the MAX6806 only). The MAX6806 fea-

tures an active-low, push-pull RESET output; the MAX6807

features an active-high, push-pull RESET output; and the

MAX6808 features an active-low, open-drain RESET out-

♦ Immune to Power-Supply Transients

♦ RESET Valid to V

= 1.0V (MAX6806/MAX6808)

CC

♦ 35µA Supply Current

♦ No External Components

♦ Manual Reset Available with 4-Pin SOT143

put. RESET is valid for V

down to 1V (MAX6806/

CC

MAX6808), and RESET (MAX6807) is guaranteed for V

Package

CC

down to 1.2V.

♦ Miniature 3-Pin SC70, 3-Pin SOT23, and 4-Pin

The MAX6806/MAX6807/MAX6808 a re a va ila b le in

3-pin SC70, 3-pin SOT23, and 4-pin SOT143 packages.

The SOT143 package includes a manual-reset input.

SOT143 Packages

Ord e rin g In fo rm a t io n

Ap p lic a t io n s

Computers

PART

TEMP. RANGE

PIN-PACKAGE

MAX6806XR_ _-T

MAX6806UR_ _-T

MAX6806US_ _-T

MAX6807XR_ _-T

MAX6807UR_ _-T

MAX6807US_ _-T

MAX6808XR_ _-T

MAX6808UR_ _-T

MAX6808US_ _-T

-40°C to +85°C

3 SC70

Controllers

3 SOT23

4 SOT143

3 SC70

Intelligent Instruments

Critical µP and µC Power Monitoring

Portable/Battery-Powered Equipment

Automotive

3 SOT23

4 SOT143

3 SC70

Bar-Code Scanners

3 SOT23

4 SOT143

* All devices available in tape-and-reel only, 2500 piece mini-

mum order quantity.

Typical Operating Circuit and Pin Configurations appear at

end of data sheet.

Note: Insert the desired number from the Selector Guide into the

blank to complete the part number. Also see Selector Guide for

top mark.

S e le c t o r Gu id e

NOMINAL

PART

RESET OUTPUT

TOP MARK

†

V

(V)

TH-

MAX6806UR46-T

MAX6806UR26-T

MAX6806UR23-T

MAX6806US46-T

MAX6806US26-T

MAX6806US23-T

FZDP

FZDQ

FZDR

KABT

KABU

KABV

4.6

2.6

2.3

4.6

2.6

2.3

Active-Low, Push-Pull

† Other reset thresholds may be available. Contact factory for availability.

Selector Guide continued at end of data sheet.

________________________________________________________________ Maxim Integrated Products

1

For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.

For small orders, phone 1-800-835-8769.

Vo lt a g e De t e c t o rs

ABSOLUTE MAXIMUM RATINGS

V

CC

to GND ..........................................................-0.3V to +6.0V

Rate of Rise, V

...........................................................100V/µs

CC

RESET, RESET to GND

(MAX6806/MAX6807) ................................-0.3V to (V + 0.3V)

RESET to GND (MAX6808)...................................-0.3V to + 6.0V

MR to GND (SOT143 package only)....................-0.3V to + 6.0V

Continuous Power Dissipation (T = +70°C)

A

SOT23, SOT143 (derate 4mW/°C above +70°C) .........320mW

SC70 (derate 2.17mW/°C above +70°C) .....................174mW

Operating Temperature Range ..........................-40°C to +85°C

Storage Temperature Range .............................-65°C to +160°C

Lead Temperature (soldering, 10sec) .............................+300°C

CC

Input Current, V

...........................................................±20mA

CC

Output Current, RESET, RESET .......................................±20mA

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional

operation of the device at these or any other conditions beyond 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 = +5V, T = -40°C to +85°C, unless otherwise noted. Typical values are at T = +25°C.) (Note 1)

CC

A

PARAMETER

SYMBOL

CONDITIONS

= 0°C to +70°C

MIN

1.0

TYP

MAX

5.5

UNITS

T

A

Supply Voltage Range

Supply Current

V

CC

V

T

A

= -40°C to +85°C

1.2

5.5

V

= +3.6V, no load

= +5.5V, no load

35

60

CC

I

CC

µA

V

50

80

CC

MAX680_ _ _46

MAX680_ _ _26

MAX680_ _ _23

4.508

2.548

2.254

4.60

2.60

2.30

4.692

2.652

2.346

T

= +25°C,

A

Reset Threshold

V

TH-

V

falling

CC

0.02

V

TH-

0.03

V

TH-

Reset Threshold Hysteresis

V

HYST

T

A

= +25°C, Figure 2

V

7/MAX608

I

= 20µA, V = 1.0V

0.3

0.4

SINK

CC

V

OL

I

= 1.0mA, V = 2.0V

CC

SINK

RESET Output Voltage

(MAX6806/MAX6808)

V

I

= 2.0mA, V = 5.0V

CC

SOURCE

V

OH

0.8V

CC

(MAX6806 only)

V

= 5.5V, RESET deasserted

CC

I

µA

V

RESET Output Leakage Current

OH

(MAX6808 only)

I

= 20µA, V = 1.2V

0.8V

CC

SOURCE

CC

V

OH

RESET Output Voltage

(MAX6807)

I

= 400µA, V = 2.0V

0.8V

CC

SOURCE

CC

V

I

= 3.2mA, V = 5.0V

0.4

OL

SINK CC

V

to Reset Delay (Note 2)

V

falling at 1mV/µs

30

µs

ppm/°C

kΩ

CC

Reset Threshold Tempco

MR Pull-Down Resistance

30

80

R

40

120

0.6

MR

V

IL

MR Input Threshold

V

CC

> V

V

TH+

V

0.7V

CC

IH

Note1: All devices are 100% production tested at T = +25°C, and are guaranteed by design for T = T

to T , as specified.

MAX

A

MIN

Note 2: RESET output for MAX6806/MAX6808, RESET output for MAX6807.

2

_______________________________________________________________________________________

Vo lt a g e De t e c t o rs

7/MAX608

Typ ic a l Op e ra t in g Ch a ra c t e ris t ic s

(T = +25°C, unless otherwise noted.)

A

POWER-DOWN RESET DELAY

vs. TEMPERATURE

SUPPLY CURRENT vs. TEMPERATURE

50

45

40

35

30

25

20

15

10

5

45

V

CC

= V - V = 100mV

CC

FALLING AT 1mV/µS

OD TH-

43

41

39

37

35

33

31

29

27

25

V

= 5.0V

CC

V

CC

= 3.3V

= 1.8V

V

CC

V

CC

= 1.0V

120

0

-60 -45 -30-15 0 15 30 45 60 75 90 105 120135

TEMPERATURE (°C)

-60 -30

0

30

60

90

TEMPERATURE (°C)

NORMALIZED RESET THRESHOLD

vs. TEMPERATURE

POWER-UP RESET DELAY vs. TEMPERATURE

12

11

10

9

1.0100

1.0080

1.0060

1.0040

1.0020

1.0000

0.9980

0.9960

0.9940

0.9920

0.9900

V

= V - V +

OD CC TH

V

CC

RISING (V )

TH+

V

= 50mV

OD

8

7

6

5

4

V

OD

= 100mV

V

CC

FALLING (V )

TH-

V

= 200mV

0

OD

-60 -30

30

60

90

120

-40 -30 -15

0

15 30 45 60 75 85

TEMPERATURE (°C)

P in De s c rip t io n

NAME

FUNCTION

SOT23/SC70

SOT143

Active-Low Reset Output (MAX6806/MAX6808). RESET remains low

while V is below the reset-threshold voltage or while MR is held high.

RESET

CC

1

Active-High Reset Output (MAX6807). RESET remains high while V is

CC

below the reset-threshold voltage or while MR is held high.

RESET

GND

2

3

4

3

2

Ground

V

CC

Supply Voltage Input

—

MR

Active-High Manual Reset Input. Internal 80kΩ resistor to GND.

_______________________________________________________________________________________

3

Vo lt a g e De t e c t o rs

Ma n u a l Re s e t In p u t

Many applications require manual-reset capabilities,

allowing an operator, a test technician, or external logic

circuitry to initiate a reset. A logic high on MR asserts a

reset and remains asserted while MR is high. This input

has an 80kΩ pull-down resistor, so the input may be left

unconnected if not used. Connect a normally open

_______________De t a ile d De s c rip t io n

Re s e t Ou t p u t

The MAX6806 voltage detector features an active-low,

push-pull RESET output, while the MAX6807 features

an active-high, push-pull RESET output. Unlike micro-

processor (µP) supervisory circuits that offer a reset

timeout period, the MAX6806 and MAX6807 RESET

goes high and RESET goes low virtually immediately

momentary switch from MR to V to create a manual-

CC

reset function. If MR is driven from long cables or if the

device is used in a noisy environment, connecting a

0.1µF capacitor from MR to ground provides noise

immunity.

once V

exceeds the reset threshold. If a brownout

CC

occurs (V

falls below the reset threshold), RESET

CC

goes low and RESET goes high. RESET is guaranteed

to be a logic low for V ≥ 1V and RESET is guaran-

CC

Hys t e re s is

The MAX6806/MAX6807/MAX6808 feature internal hys-

teresis that creates two trip points: one for the rising

supply voltage and one for the falling supply voltage

(Figure 2). The hysteresis prevents the output from oscil-

teed to be a logic high for V

≥ 1.2V.

CC

The MAX6808 features an active-low, open-drain RESET

output. The output sinks current when V falls below

CC

the reset threshold. Connect a pull-up resistor from

RESET to any supply voltage up to 6V (Figure 1). Select

a resistor value large enough to provide a logic low and

small enough to provide a logic high while supplying all

input and leakage currents connected to the RESET

line. A 100kΩ resistor is sufficient in applications driving

high-impedance loads.

lating (chattering) when V

is near the reset threshold.

CC

Re s e t Th re s h o ld Ac c u ra c y

The MAX6806/MAX6807/MAX6808 are ideal for sys -

tems using a 5V ±5%, 3V ±5%, or 2.5V ±5% power

supply with ICs specified for 5V ±10%, 3V ±10%, or

2.5V ±10%, respectively. The reset is guaranteed to

assert after the power supply falls out of regulation, but

before power drops below the minimum specified oper-

ating voltage range for the system ICs.

The manual reset input (MR, 4-pin SOT143 package)

can also initiate a reset (see Manual Reset Input sec-

tion).

7/MAX608

+3.3V

+5.0V

V

TH+

V

= V - V

HYST

HYST TH+ TH-

V

TH-

V

CC

V

CC

100k

V

OH

5V SYSTEM

MAX6808

RESET

(MAX6806/MAX6808)

V

OL

RESET

V

OH

GND

RESET

(MAX6807)

V

OL

Figure 2. Input and Output Waveforms with V Varied

Figure 1. The MAX6808 open-drain RESET output allows use

CC

with multiple supplies.

4

_______________________________________________________________________________________

Vo lt a g e De t e c t o rs

7/MAX608

En s u rin g a Va lid Re s e t Ou t p u t Do w n t o

Ap p lic a t io n s In fo rm a t io n

V

= Gro u n d

CC

fa lls b e low 1V, the MAX6806/MAX6808

Ne g a t ive -Go in g V

Tra n s ie n t s

CC

Whe n V

CC

In addition to asserting a reset signal during power-up,

power-down, and brown-out conditions, the MAX6806/

MAX6807/MAX6808 are immune to short-duration, neg-

RESET output no longer sinks current—it becomes an

open circuit. Therefore, high-impedance CMOS logic

inputs connected to RESET can drift to undetermined

voltages. This presents no problem in most applica-

ative-going V transients.

CC

tions, since most circuitry is inoperative when V

is

CC

Figure 3 displays typical transient durations vs. reset-

comparator overdrive for which the MAX6806/MAX6807/

MAX6808 do not generate a reset pulse. The graph was

below 1V. In applications where RESET must be valid

down to ground, add a pull-down resistor to RESET so

any stray leakage currents flow to ground, holding

RESET low (Figure 4). Select R1 to be large enough not

to loa d RESET a nd s ma ll e noug h to p ull RESET to

ground. For most applications, 100kΩ will not load

RESET a nd will p ull RESET to g round . Simila rly, if

RESET (MAX6807) must be valid below 1.2V, add a

pull-up resistor to RESET.

generated using a negative-going pulse applied to V

,

CC

starting 0.5V above the actual reset threshold and end-

ing below it by the magnitude indicated (reset-compara-

tor overdrive). The graph indicates the maximum pulse

width a negative-going V

transient can have without

CC

causing a reset pulse. As the magnitude of the transient

increases (goes further below the reset threshold), the

maximum allowable pulse width decreases. A 0.1µF

capacitor mounted as close as possible to V

pro-

CC

vides additional transient immunity.

80

T = +25°C

A

70

V

CC

V

CC

60

50

40

30

R1

100k

MAX6806

MAX6807

MAX680 46

RESET

R1

100k

20

GND

10

100

1000

RESET COMPARATOR OVERDRIVE, V - V (mV)

TH-

CC

Figure 3. Maximum Transient Duration without Causing a

Reset Pulse vs. Reset Comparator Overdrive

Figure 4. RESET / RESET Valid to V = Ground Circuit

CC

_______________________________________________________________________________________

5

Vo lt a g e De t e c t o rs

In t e rfa c in g t o µP s w it h

Bid ire c t io n a l Re s e t P in s

µPs with bidirectional reset pins (such as the Motorola

68HC11 series) can contend with push-pull RESET out-

puts, resulting in indeterminate logic levels. Use the

MAX6808 with the open-drain RESET when interfacing

to this type of controller.

V

CC

V

CC

V

CC

4.7k

µP

MAX6808

RESET

GND

Figure 5. Interfacing to µPs with Bidirectional Reset I/O

7/MAX608

S e le c t o r Gu id e (c o n t in u e d )

NOMINAL

PART*

RESET OUTPUT

TOP MARK

†

V

(V)

TH-

MAX6806XR46-T

MAX6806XR26-T

MAX6806XR23-T

MAX6807UR46-T

MAX6807UR26-T

MAX6807US46-T

MAX6807US26-T

MAX6807XR46-T

MAX6807XR26-T

MAX6808UR46-T

MAX6808UR26-T

MAX6808US46-T

MAX6808US26-T

MAX6808XR46-T

MAX6808XR26-T

AAA

AAB

4.6

Active-Low, Push-Pull

2.6

2.3

4.6

2.6

4.6

2.6

4.6

2.6

4.6

2.6

4.6

2.6

4.6

2.6

AAC

FZDS

FZDT

KABW

KABX

AAD

Active-High, Push-Pull

AAE

FZDU

FZDV

KABY

KABZ

AAF

Active-Low, Open-Drain

AAG

† Other reset thresholds may be available. Contact factory for availability.

6

_______________________________________________________________________________________

Vo lt a g e De t e c t o rs

7/MAX608

P in Co n fig u ra t io n s

TOP VIEW

GND

(RESET)/RESET

1

4

(RESET)/RESET

1

2

MAX6806

MAX6807

MAX6808

MAX6806

MAX6807

MAX6808

3

V

CC

GND

MR

2

3

V

CC

SOT23/SC70

SOT143

( ) ARE FOR MAX6807

Typ ic a l Op e ra t in g Circ u it

V

CC

V

CC

V

CC

MAX6806

MAX6807

MAX6808

µP

RESET

INPUT

(RESET)/RESET

GND

( ) ARE FOR MAX6807

___________________Ch ip In fo rm a t io n

TRANSISTOR COUNT: 72

_______________________________________________________________________________________

7

Vo lt a g e De t e c t o rs

P a c k a g e In fo rm a t io n

7/MAX608

8

_______________________________________________________________________________________

Vo lt a g e De t e c t o rs

7/MAX608

P a c k a g e In fo rm a t io n (c o n t in u e d )

_______________________________________________________________________________________

9

Vo lt a g e De t e c t o rs

P a c k a g e In fo rm a t io n (c o n t in u e d )

7/MAX608

10 ______________________________________________________________________________________

Vo lt a g e De t e c t o rs

7/MAX608

NOTES

______________________________________________________________________________________ 11

Vo lt a g e De t e c t o rs

NOTES

7/MAX608

Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are

implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.

12 ____________________Ma x im In t e g ra t e d P ro d u c t s , 1 2 0 S a n Ga b rie l Drive , S u n n yva le , CA 9 4 0 8 6 4 0 8 -7 3 7 -7 6 0 0

Printed USA

is a registered trademark of Maxim Integrated Products.

型号	制造商	描述	价格	文档
MAX6808UR46+	MAXIM	Power Supply Support Circuit, Fixed, 1 Channel, +4.6VV, CMOS, PDSO3, SOT-23, 3 PIN	获取价格
MAX6808UR46+T	MAXIM	Power Supply Support Circuit, Fixed, 1 Channel, PDSO3, SOT-23, 3 PIN	获取价格
MAX6808UR46-T	MAXIM	Voltage Detector	获取价格
MAX6808UR46-T	ROCHESTER	1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO3, SOT-23, 3 PIN	获取价格
MAX6808US23-T	MAXIM	Analog IC	获取价格
MAX6808US26+	MAXIM	Voltage Detectors	获取价格
MAX6808US26+T	MAXIM	Power Supply Support Circuit, Fixed, 1 Channel, +2.6VV, CMOS, PDSO4, SOT-143, 4 PIN	获取价格
MAX6808US26-T	MAXIM	Voltage Detector	获取价格
MAX6808US26-T	ROCHESTER	1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO4, SOT-143, 4 PIN	获取价格
MAX6808US32-T	MAXIM	Analog IC	获取价格

MAX6808UR36-T

MAX6808UR36-T 概述

MAX6808UR36-T 数据手册

MAX6808UR36-T 相关器件

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