Diodes APX809, APX810 User Manual

APX809/810

3-PIN MICROPROCESSOR RESET CIRCUITS

Features

• Precision Monitoring of +2.5V, +3V, +3.3V, and +5V Power-Supply Voltages

• Fully Specified Over Temperature

• Available in three Output Configurations

• Push-Pull

• 200ms Typ Power-On Reset Pulse Width

• 30µA Supply Current (Typ.)

• Guaranteed Reset Valid to V

• No External Components

• SOT23 and SOT23R: Available in “Green” Molding

Compound (No Br, Sb)

• Lead Free Finish/RoHS Compliant (Note 1)

RESET Active Low (APX809)

RESET Active High (APX810)

= +1V

CC

Applications

• Computers

• Controllers

• Intelligent Instruments

• Critical µP and µC Power Monitoring

• Portable/Battery Powered Equipment

• Automotive

Ordering Information

General Description

The APX809/810 are used for microprocessor (µP) supervisory circuits to monitor th e power supplies in µP and digital systems . They provide excellent circuit reliability and low cost by eliminating external components and adjustments when used with +5V, +3.3V, +3.0V powered circuits.

These circuits perform a single function: they assert a reset signal whenever the V threshold, keeping it asserted for at least 240ms after V risen above the reset threshold. Reset thresholds suitable for operation with a variety of supply voltages are available. The APX809/810 have push pull outputs. The APX809 have an active

low

RESET

RESET output. The reset comparator is designed to ignore fast transients on V correct logic state for V the APX809/810 ideal for use in portable equipment. The APX809/810 is available in a 3-pin SOT23 and SOT23R packages.

output, while the APX810 has an active high

CC

supply voltage declines below a preset

CC

, and the outputs are guaranteed to be in the

down to 1V. Low supply current makes

CC

has

APX 8 XX - XX XX G - 7

Enable

09 : Active-Low 10 : Active-High

Voltage

46 : 4.63 44 : 4.38

Package

SA : SOT23 SR : SOT23R

40 : 4.00 31 : 3.08 29 : 2.93 26 : 2.63 23 : 2.25

Device

Package

Code

Packaging

(Note 2)

APX809-XXSAG-7 SA SOT23 3000/Tape & Reel -7 APX810-XXSAG-7 SA SOT23 3000/Tape & Reel -7 APX809-XXSRG-7 SR SOT23R 3000/Tape & Reel -7 APX810-XXSRG-7 SR SOT23R 3000/Tape & Reel -7

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

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

.

APX809/810 Rev. 4 1 of 9 FEBRUARY 2009

www.diodes.com © Diodes Incorporated

Green

G : Green

Packing

7 : Tape & Reel

7” Tape and Reel

Quantity Part Number Suffix

Pin Assignments

APX809/810

3-PIN MICROPROCESSOR RESET CIRCUITS

( Top View )

1

2

APX809 APX810

3

V

CC

RESET

GND

(RESET)

1

2

APX809 APX810

RESET

3

V

CC

(RESET)

GND

SOT23RSOT23

Pin Descriptions

Pin Name Description

GND Ground

RESET

(RESET)

VCC Operating Voltage Input

Reset Output Pin L: for APX809 H: for APX810

Absolute Maximum Ratings

Symbol Parameter Rating Unit

ESD HBM Human Body Model ESD Protection 5 KV

ESD MM Machine Model ESD Protection 500 V

VCC Supply Voltage -0.3 to +6.0 V

V

RESET

ICC Input Current, VCC 20 mA

IO

PD

TOP Operating Junction Temperature Range -40 to +105 °C

TST Storage Temperature Range -65 to +150 °C

APX809/810 Rev. 4 2 of 9 FEBRUARY 2009

RESET,

Output Current, RESET, Continuous Power Dissipation (T

de-rate 4mW/°C above +70°C

RESET (push-pull)

RESET

www.diodes.com © Diodes Incorporated

= +70°C),

A

-0.3 to (V

+ 0.3) V

CC

20 mA

400 mW

T

APX809/810

3-PIN MICROPROCESSOR RESET CIRCUITS

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 Ambi ent Temperature Range -40 85 TR Vcc Rising Time (Vcc = 0~VT) 100 V/ uS

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

Range TA = 0oC to +70oC 1.0 5.5 V

CC

ICC Supply Current VTH+ 0.2V 30 40 μA

APX809/810-23

2.21 2.25 2.30 APX809/810-26 2.59 2.63 2.69 APX809/810-29 2.88 2.93 3.00 APX809/810-31 3.02 3.08 3.15

= 0oC-85oC

T

A

APX809/810-40 3.93 4.00 4.08 APX809/810-44 4.31 4.38 4.47 APX809/810-46 4.56 4.63 4.72 APX809/810-23

2.20 2.25 2.30

VTH

Reset Threshold

APX809/810-26 2.57 2.63 2.69 APX809/810-29 2.86 2.93 3.00

T

APX809/810-31 3.00 3.08 3.15

= -40oC-85oC

A

APX809/810-40 3.92 4.00 4.08 APX809/810-44 4.29 4.38 4.47 APX809/810-46 4.54 4.63 4.72

Reset Threshold Tempco 30 ppm/ oC

TS Set-up Time V

T

Reset Active Timeout Period TA = 0oC to +85oC 140 200 280 ms

DELAY

VOL

VOH

VOL

V

OH

θ

JA

θ

JC

Notes: 3. Test condition for SOT23/ SOT23R: Devices mounted on FR-4 substrate PC board, 2oz copper, with minimum recommended pad layout.

TRESE Output Voltag e Lo w

(APX809)

Output Voltage-High

TRESE

(APX809) RESET Output V oltage-Low

(APX810) RESET Output Voltage-High (APX810) Thermal Resistance Junction-to-Ambient

hermal Resistance

Junction-to-Case

= VTH to (VTH – 100mV) 20 μs

CC

V

= V

CC

V

CC

V

CC

V

CC

I

SOURCE

V

CC

I

SOURCE

V

CC

V

CC

-0.2, I

TH

= V

-0.2, I

TH

> 1.0V, I > V

+0.2,

TH

= 500uA

> V

+0.2,

TH

= 800uA

= V

+0.2, I

TH

= V

+0.2, I

TH

1.8V < VCC < VTH -0.2, I

= 150uA

SOURCE

= 1.2mA 0.3

SINK

= 3.2mA 0.4

SINK

= 50uA 0.3

SINK

0.8V

CC

–1.5

V

CC

= 1.2mA 0.3

SINK

= 3.2mA 0.4

SINK

0.8 V

V

CC

SOT23/SOT23R (Note 3) 201 SOT23/SOT23R (Note 3) 56

APX809/810 Rev. 4 3 of 9 FEBRUARY 2009

www.diodes.com © Diodes Incorporated

o

C

V

o

V

C/W C/W

APX809/810

Typical Application Circuit

V

CC

C

IN

100nF

3-PIN MICROPROCESSOR RESET CIRCUITS

V

CC

APX8XX

RESET

(RESET)

GND

Functional Description

A microprocessor’s (µP’s) reset input starts the µP in a known state. The APX809/810 assert reset to prevent code-execution errors during power-up, power-down, or brownout conditions. They assert a reset signal whenever the V declines below a preset threshold, keeping it asserted for at least 240ms after V APX809/810 have a push-pull output stage.

Ensuring a Valid Reset Output Down to V

RESET

exceeds the reset threshold, an internal timer keeps low for the reset timeout period; after this interval,

goes high. If a brownout condition occurs (V

has risen above the reset threshold. The

CC

= 0

CC

is guaranteed to be a logic low for VCC > 1V. Once VCC

RESET reset threshold), RESET goes low. Any time

goes below the reset threshold, the internal timer resets to

V

CC

zero, and V

CC

low for the reset timeout period. When V

longer sinks current—it becomes an open circuit. Therefore,

RESET goes low. The internal timer starts after

returns above t he re set thr eshol d, and

falls below 1V, the APX809

CC

supply voltage

CC

RESET

dips below the

CC

RESET

remains

output no

V

CC

Microprocessor

RESET INPUT

GND

high-impedance CMO S logic inputs c onnected to drift to undetermined voltages.

This presents no problem in most applications since most µP and other circuitry is inoperative with V

applications where pull down resistor to currents to flow to ground, holding not critical; 100k are large enough not to load small enough to pull

RESET must be valid down to 0V, adding a

RESET

RESET is required to remain valid for V

Benefits of Highly Accurate Reset Threshold

Most µP supervisor ICs has reset threshold voltages 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 n ominal supply ±5%, t his leaves a zone of uncertainty where the supply is between 5% and 10% low, and where the reset may or may not be asserted.

below 1V. However, in

CC

causes any stray leakage

RESET low. R1’s value is

to ground. For the APX810 if

CC

RESET can

RESET and

< 1V.

APX809/810 Rev. 4 4 of 9 FEBRUARY 2009

Block Diagram

V

REF

APX809/810

3-PIN MICROPROCESSOR RESET CIRCUITS

Driver

Delay Circuit

RESET

/ RESET

APX809/810 Rev. 4 5 of 9 FEBRUARY 2009

APX809/810

Performance Characteristics

3-PIN MICROPROCESSOR RESET CIRCUITS

RESET Time out Period vs. Temperature

250

240

230

220

210

200

190

180

170

160

RESET Tim eout Period (mS)

150

-40℃ -25℃ 0℃ 25℃ 50℃ 85℃ 105℃ 125℃

Temperature

Figure 1 Figure 2

Vcc Supply Curre nt vs. Tem pera ture

(Vcc=3.3V Vth=2.93V)

35

34

33

32

31

30

29

28

27

Vcc Supply Current (uA)

26

25

-40℃ -25℃ 0℃ 25℃ 50℃ 85℃ 105℃ 125℃

Temperature

RESET Threshold Volta ge vs. Tem pera ture

3.2

3.15

3.1

3.05

3

2.95

2.9

2.85

RESET Thershold Voltage (V)

2.8

-40℃ -25℃ 0℃ 25℃ 50℃ 85℃ 105℃ 125℃

Temperature

Supply Current vs. Vcc

40 35 30 25 20 15 10

Supply Current (uA)

5 0

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

Vcc

Figure 3 Figure 4

APX809/810 Rev. 4 6 of 9 FEBRUARY 2009

APX809/810

3-PIN MICROPROCESSOR RESET CIRCUITS

Timing Diagram

Vth

Vcc

Vth

T

Delay

/RESET

Vth

T

Delay

RESET

APX809/810 Rev. 4 7 of 9 FEBRUARY 2009

T

Delay

T

Delay

Marking Information

(1) SOT23/SOT23R

( Top View )

APX809/810

3-PIN MICROPROCESSOR RESET CIRCUITS

XX

3

Y W

XX : Identification code

Y

: Year 0~9

W

X

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

a~z : 27~52 week; z represents 52 and 53 week

X

1 2

Device Package Identification Code

APX809-46SA SOT23 X2 APX809-44SA SOT23 X3 APX809-40SA SOT23 X4 APX809-31SA SOT23 X5 APX809-29SA SOT23 X6 APX809-26SA SOT23 X7 APX809-23SA SOT23 X8 APX810-46SA SOT23 XA APX810-44SA SOT23 XB APX810-40SA SOT23 XC APX810-31SA SOT23 XD APX810-29SA SOT23 XE APX810-26SA SOT23 XF APX810-23SA SOT23 XG APX809-46SR SOT23R Y2 APX809-44SR SOT23R Y3 APX809-40SR SOT23R Y4 APX809-31SR SOT23R Y5 APX809-29SR SOT23R Y6 APX809-26SR SOT23R Y7 APX809-23SR SOT23R Y8 APX810-46SR SOT23R YA APX810-44SR SOT23R YB APX810-40SR SOT23R YC APX810-31SR SOT23R YD APX810-29SR SOT23R YE APX810-26SR SOT23R YF APX810-23SR SOT23R YG

: A~Z : Green

APX809/810 Rev. 4 8 of 9 FEBRUARY 2009

APX809/810

3-PIN MICROPROCESSOR RESET CIRCUITS

Package Information (All Dimensions in mm)

(1) Package Type: SOT23/SOT23R

Notes: 4. Package outline dimensions as shown on Diodes Inc. package outline dimensions document AP02002, which can be found on our website at http://www.diodes.com/datasheets/ap02002.pdf

IMPORTANT NOTICE

Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further notice to any product herein. Diodes Incorporated does not assume any liability arising out of the application or use of any product described herein; neither does it convey any license under its patent rights, nor the rights of others. The user of products in such applications shall assume all risks of such use and will agree to hold Diodes Incorporated and all the companies whose products are represented on our website, harmless against all damages.

LIFE SUPPORT

Diodes Incorporated products are not authorized for use as critical components in life support devices or systems without the expressed written approval of the President of Diodes Incorporated.

APX809/810 Rev. 4 9 of 9 FEBRUARY 2009

Diodes APX809, APX810 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual