Diodes APX811, APX812 User Manual

APX811/812

4-Pin Microprocessor Supervisor With Manual Reset

Features

• Precision Monitor of(2.5V/3.0V/3.3V/5.0V) power supply voltage

• Full specified over temperature

• Manual reset input

• Available in four output configuration

• Push-pull

• Push-pull RESET Acti ve high(APX812)

• Power-on reset generator with fixed delay time 200ms

• SOT143: Available in “Green” Molding Compound

(No Br, Sb)

• Lead Free Finish/RoHS Compliant (Note 1)

Active low(APX811)

RESET

Applications

• Computers

• Controllers

• Intelligent Instruments

• Critical uP and UC power Monitoring

• Portable/Battery powered Equipment

• Automotive

Typical Application Circuit

General Description

The APX811/812 are used for microprocessor supervisory circuit to monitor the power supplies in These circuit perform a single function: they assert a reset signal whenever the Vcc supply voltage declines below a preset threshold, keeping it asserted for at least 240ms after Vcc has risen above the reset threshold. Reset thresholds suitable for operation with a variety of supply voltages are available. The APX811/812 have push-pull outputs.

The APX811 has an active low APX812 has an active high RESET output.

The APX811/812 devices incorporate a manual reset input, A low level at

The APX811/2 are t argeted at 2.5V, 3V, 3.3V a nd 5V powered systems and are available with different threshold voltages to meet the exact needs of the system. They ar e available in the space saving SOT143 package and operate over the whole industrial temperature range, -40 to 85°C.

causes RESET to become active.

MR

output, while the

RESET

MR

.

Vcc

(Manual Reset)

Push Botton

Vcc

APX811/APX812

MR

GND

RESET

(RESET)

Vcc

MCU

RESET Input

GND

APX811/812 Rev. 2 1 of 10 OCTOBER 2009 DS31960 www.diodes.com © Diodes Incorporated

Ordering Information

APX811/812

4-Pin Microprocessor Supervisor With Manual Reset

APX 8 XX - XX U G - 7

Enable

11 : Active-Low 12 : Active-High

Voltage

46 : 4.63 44 : 4.38 40 : 4.00

31 : 3.08 29 : 2.93 26 : 2.63 23 : 2.25

Package

U : SOT143

Green

G : Green

Packing

7 : Tape & Reel

Device

APX811-XXUG-7 U SOT143 3000/Tape & Reel -7 APX812-XXUG-7 U SOT143 3000/Tape & Reel -7

Notes: 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Pl ease visit our website at

http://www.diodes.com/datasheets/ap02001.pdf

http://www.diodes.com/products/lead_free.html

2. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at

Package

Code

Packaging

(Note 2)

.

Quantity Part Number Suffix

7” Tape and Reel

Pin Assignments

( Top View )

4

GND

1

Vcc

MR

3

RESET

(RESET)

2

SOT143

Pin Descriptions

Pin Name Description

GND Ground

RESET

(RESET)

VCC Operating Voltage Input

MR

APX811/812 Rev. 2 2 of 10 OCTOBER 2009 DS31960 www.diodes.com © Diodes Incorporated

Reset output Pin L: for APX811 H: for APX812

Manual reset (Active Low)

Block Diagram

APX811/812

4-Pin Microprocessor Supervisor With Manual Reset

Vcc

Delay Circuit

Driver

RESET

Vref

MR

Absolute Maximum Ratings

Symbol Parameter Rating Unit

ESD HBM Human Body Model ESD protection 3 kV

ESD MM Machine Model ESD Protection 500 V

VCC Supply voltage -0.3~7 V

V

RESET -0.3 to (Vcc+0.3) V

RESET

ICC Input Current, Vcc 20 mA

IO Output current 20 mA

PD Power dissipation 320 mW

Recommended Operating Conditions

Symbol Parameter Min Max Unit

VCC Supply Voltage 1.1 5.5 V

VIN Input Voltage 0 (VCC+0.3) V

TA Operating Ambient Temperature -40 85

APX811/812 Rev. 2 3 of 10 OCTOBER 2009 DS31960 www.diodes.com © Diodes Incorporated

o

C

T

APX811/812

4-Pin Microprocessor Supervisor With Manual Reset

Electrical Characteristics (T

= 25ºC)

A

T

= -40 to 85

A

o

C unless otherwise note. Typical values are at TA=+25 oC.

Symbol Parameter Test Conditions Min Typ. Max Unit

VCC V

ICC Supply Current

Range 1.0 5.5 V

CC

V

th

+ 0.2V

30 40 µA

2.22 2.25 2.28 V

2.59 2.63 2.67 V

2.89 2.93 2.98 V

Reset threshold T

Vth

=25

A

o

C.

3.03 3.08 3.13 V

3.94 4.00 4.06 V

4.31 4.38 4.45 V

4.56 4.63 4.70 V

Set-up Time

t

s

VOL

VOH

VOL

V

OH

θ

JA

θ

JC

Notes: 3. Test condition for SOT143: Device mounted on FR-4 substrate, 1"*1", 2oz, copper, single-sided, PC boards.

TRESE Output Vol tage Low

(APX811)

Output Voltage-High

TRESE

(APX811)

RESET Output Voltage-Low (APX812)

RESET Output Voltage-High (APX812)

Thermal Resistance Junction-to-Ambient

hermal Resistance

Junction-to-Case

V

= Vth to (Vth – 100mV)

CC

V

= V

CC

V

= V

CC

V

> 1.0V, I

CC

V

> V

CC

I

SOURCE

V

> V

CC

I

SOURCE

V

= V

CC

V

= V

CC

-0.2, I

th

-0.2, I

th

+0.2,

th

= 500uA

+0.2,

th

= 800uA

+0.2, I

th

+0.2, I

th

= 1.2mA

SINK

= 3.2mA

SINK

= 50uA 0.3

SINK

= 1.2mA

SINK

= 3.2mA

SINK

1.8V < VCC < Vth -0.2, I

= 150uA

SOURCE

SOT143 (Note 3) 240 SOT143 (Note 3) 71

20 µs

0.3

0.4

0.8V

CC

V

–1.5

CC

0.3

0.4

0.8 V

CC

V

o

C/W

o

C/W

Timing requirements (T

=25oC)

A

Symbol Parameter Test Conditions Min Typ. Max Unit

tW Pulse Width

at

MR

> V

V

CC

+0.2V, VIL=0.3×VCC, VIH=0.7×VCC

th-

100 - - ns

APX811/812 Rev. 2 4 of 10 OCTOBER 2009 DS31960 www.diodes.com © Diodes Incorporated

APX811/812

4-Pin Microprocessor Supervisor With Manual Reset

Switching Characteristics (T

=25oC)

A

Symbol Parameter Test Conditions Min Typ. Max Unit

V

> V

+0.2V,

th-

> V

+0.2V,

th-

=0.3×VCC,

=0.7×VCC

= V

-0.2V,

th-

= V

+0.2V

th-

> V

+0.2V,

th-

=0.3×VCC,

=0.7×VCC

= V

-0.2V,

th-

= V

+0.2V

th-

140 200 280 ms

- - 0.1 µs

- - 25 µs

- - 0.1 µs

- - 25 µs

t

Delay Time APX811/812

t

d

Propagation (Delay) Time,

PHL

High-to-low-level Output

Propagation (Delay) Time,

PLH

Low-to-high-level Output

MR

to

RESET

delay (APX811/812)

to RESET delay

V

CC

MR to RESET delay

(APX811/812) V

to RESET delay

CC

(APX811/812)

CC

See timing diagram V

CC

V

IL

V

IH

V

IL

V

IH

V

CC

V

IL

V

IH

V

IL

V

IH

Timing Diagram

RESET vs. Vcc Timing Diagram

Vcc

/RESET

RESET

/RESET

Vcc

/MR

Vth

d

t

td

RESET vs. /MR Timing Diagram

td

APX811/812 Rev. 2 5 of 10 OCTOBER 2009 DS31960 www.diodes.com © Diodes Incorporated

)

4-Pin Microprocessor Supervisor With Manual Reset

Typical Performance Characteristics

APX811/812

RESE T Timeout Period v s. Temperature

250

240

230

220

210

200

190

180

170

160

RESET Timeout Period (ms

150

-40℃ -25℃ 0℃ 25℃ 50℃ 85℃ 105℃ 125℃

Temperature

RE SE T Threshold Voltage vs. Temperature

3.2

3.15

3.1

3.05

3

2.95

2.9

2.85

RESET Thershold Vo l tage (V

2.8

-40℃ -25℃ 0℃ 25℃ 50℃ 85℃ 105℃ 125℃

Temperature

Vcc Supp ly Curren t vs. Temp er at ure

(Vcc=3.3V Vth = 2. 93V )

35

34

33

32

31

30

29

28

27

Vcc Supply Current (µA

26

25

-40℃ -25℃ 0℃ 25℃ 50℃ 85℃ 105℃ 125℃

Temperature

Supply Curreny vs. Vcc

40

35

30

25

20

15

10

Supply Current (µA

5

0

1.5V 2.5V 3.3V 4.0V 5.0V 5.5V

Vcc

APX811/812

4-Pin Microprocessor Supervisor With Manual Reset

Application Information

A microprocessor’s (µP’s) reset input starts the µP in a known state. The APX811/812 asserts reset to prevent code-execution errors during power-up, power-down, or brownout conditions. They assert a reset signal whenever the V

preset threshold or the APX811/812 have a push-pull output stage.

The APX811/812 reset output is guaranteed to be logic low for the APX811 and high the APX812 for V reset threshold, an internal timer keeps

interval, the APX811’s reset threshold), the APX811’s threshold, the internal timer resets to zero, and the reset threshold, and

Ensuring a Valid Reset Output Down to V

When V CMOS logic inputs connected to µP and other circuit ry is i nop er ativ e with V down resistor to large enough not to load

For the APX812 if RESET is required to remain valid for V recommended.

Benefits of Highly Accurate Reset Threshold

Most µP supervisor ICs has reset threshold vol tages between 5% and 10% below the value of nominal supply voltages. This ensures a reset will not occur within 5% of the nominal supply, but will occur when the supply is 10% below nominal. When using ICs rated at only the nominal supply ±5%, this leaves a zone of unce rtainty where the supply is be tween 5% a nd 10% low, and w here the reset may or may not be asserted.

falls below 1V, the APX811

CC

RESET

pin is brought low, keeping it asserted for at least 240ms after VCC has risen above the reset threshold. The

MR

output low (and R ESET high for the APX812) for the reset timeout period. After this

RESET

output goes high (APX812’s RESET output goes low). If a brownout condition occurs (VCC dips below the

RESET

output goes low (APX812’s RESET output goes high). Any time VCC goes below the reset

RESET

goes low (RESET goes high). The internal timer starts after VCC returns above

RESET

remains low (RESET remains high) for the reset timeout period.

RESET

= 0

CC

no longer sinks current-— it becomes an open circuit. Therefore, high-impedance

RESET

can drift to undetermined voltages. This presents no problem in most applications since most

RESET

below 1V. However, in applications where

CC

causes any stray leakage currents to flow to ground, holding

and small enough to pull

RESET

to ground.

RESET

< 1V then a 100kΩ pull-up resistor between RESET and VCC is

CC

RESET

supply voltage declines below a

CC

> 1V. Once VCC exceeds the

CC

must be valid down to 0V, ad di ng a pul l

low. R1’s value is not critical; 100k is

Marking Information

(1) SOT143

( Top View )

APX811/812

4-Pin Microprocessor Supervisor With Manual Reset

Y W

3

XX : Identification code

: Year 0~9

Y

: Week : A~Z : 1~26 week;

X

W

a~z : 27~52 week; z represents

4

XX

52 and 53 week

: A~Z : Green

1 2

Device Package Identification Code

APX811-46U SOT143 C2 APX811-44U SOT143 C3 APX811-40U SOT143 C4 APX811-31U SOT143 C5 APX811-29U SOT143 C6 APX811-26U SOT143 C7 APX811-23U SOT143 C8 APX812-46U SOT143 C9 APX812-44U SOT143 CA APX812-40U SOT143 CB APX812-31U SOT143 CC APX812-29U SOT143 CD APX812-26U SOT143 CE APX812-23U SOT143 CF

X

4-Pin Microprocessor Supervisor With Manual Reset

Package Information (All Dimensions in mm)

(1) Package Type: SOT143

APX811/812

0.77/0.93

1.78/2.03

1.58/1.83

2.80/3.0

0.37/0.51

0.45/0.6

2.28/2.48

1.20/1.40

0.085/0.18

0.89/1.0

0.013/0.10

0.46/0.6

.

p

y

t

°

8

APX811/812

4-Pin Microprocessor Supervisor With Manual Reset

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IMPORTANT NOTICE

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Diodes APX811, APX812 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual