Diodes APX803/D User Manual

APX803/D

3-PIN MICROPROCESSOR RESET CIRCUIT

Description

The APX803/D is used for microprocessor (µP) supervisory circuits to monitor the 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 on power up and whenever the V declines below a preset threshold, keeping it asserted for a fixed period of time after V threshold. For the APX803D this period is a minimum of 1ms while for other APX803 variants it is at least 140ms. The reset comparator is designed to ignore fast transients on V the outputs are guaranteed to be in the correct logic state for V

down to 1V.

CC

The APX803 is available with different reset thresholds suitable for operation with a variety of supply voltages, however the APX803D is available with a 2.93V threshold voltage. The APX803/D have an open collector active low output and compliment Diodes APX809/10 which have pushpull output stages.. Low supply current makes the APX803/D ideal for use in portable equipment. The APX803/D are available in two pin out variants of the 3-pin SOT23 package.

has risen above the reset

CC

supply voltage

CC

, and

CC

RESET

Pin Assignments

GND

RESET

GND

1

2

1

2

( Top View )

APX803

SOT23

( Top View )

APX803

SOT23R

3

V

CC

3

V

CC

Features

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

• Fully Specified Over Temperature

• Open-drain

• Power-On/power supply glitch Reset Pulse

• APX803D 2ms (Typ)

• APX803 200ms (Typ)

• 30µA Supply Current (Typ.)

• Guaranteed Reset Valid to VCC = +1V

• No External Components

• SOT23 and SOT23R: Available in “Green” Molding Compound (No Br, Sb)

• Lead Free Finish/ RoHS Compliant (Note 1)

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

RESET

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

APX803

Document number: DS32132 Rev. 2 - 2

Active Low

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Applications

• Computers

• Controllers

• Intelligent Instruments

• Critical µP and µC Power Monitoring

• Portable/Battery Powered Equipment

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Typical Application Circuit

C

IN

100nF

APX803/D

3-PIN MICROPROCESSOR RESET CIRCUIT

V

CC

Pin Descriptions

Pin Name Description

GND Ground

Reset Output Pin

RESET

Active Low Open Drain

VCC Operating Voltage Input

V

CC

APX803

GND

RESET

V

CC

Microprocessor

RESET INPUT

GND

Functional Block Diagram

V

CC

APX803

Document number: DS32132 Rev. 2 - 2

V

REF

Delay timeOscillator

APX803/D

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RESET

RESETRESET

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APX803/D

Absolute Maximum Ratings

Symbol Parameter Rating Unit

ESD HBM Human Body Model ESD Protection 2 kV

ESD MM Machine Model ESD Protection 200 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

Recommended Operating Conditions

RESET (open drain)

Output Current, Continuous Power Dissipation (T

rate 4mW/°C above +70°C

RESET

= +70°C), de-

A

3-PIN MICROPROCESSOR RESET CIRCUIT

-0.3 to 6 V

20 mA

400 mW

Symbol Parameter Min Max Unit

VCC Supply Voltage 1.1 5.5 V

VIN Input Voltage 0 (VCC+0.3) V

V

RESET

TA Operating Ambient Temperature Range -40 85 °C

dVCC/dt VCC Rate of rise (VCC = 0~VT)

RESET output voltage

0 5.5 V

100 V/µs

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APX803/D

T

Electrical Characteristics (T

TA= -40 to 85°C unless otherwise note. Typical values are at TA=+25 °C.

Symbol Parameter Test Conditions Min Typ. Max Unit

ICC Supply Current V

APX803-23 APX803-26 2.59 2.63 2.66 APX803-29 2.89 2.93 2.96

Reset Threshold

VTH

Reset Threshold hysteresis V Reset Threshold Tempco 30 ppm/°C

tS VCC to RESET delay V

DELAY

VOL

Reset Active Timeout Period

TRESE Output Voltage Low

t

APX803D-29 2.89 2.93 2.96 APX803-31 3.04 3.08 3.13 APX803-40 3.94 4.00 4.06 APX803-44 4.31 4.38 4.45 APX803-46 4.56 4.63 4.70

APX803-XX APX803D-29 1 3.3

= 25°C)

A

T

V

+ 0.2V 30 40 μA

TH

= 25oC

A

– V

TH-H

CC

A

CC

TH-L

= VTH to (VTH – 100mV) 20 µs

= 0oC to +85oC

= V

-0.2, I

TH

= V

-0.2, I

TH

> 1.0V, I

3-PIN MICROPROCESSOR RESET CIRCUIT

2.21 2.25 2.30

40 mV

140 200 280

= 1.2mA 0.3

SINK

= 3.5mA 0.4

SINK

= 50uA 0.3

SINK

V

ms

V V

IOH

θ

JA

θ

JC

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

3. Final datasheet limits to be determined by characterization and correlation.

TRESE Output High leakage

current Thermal Resistance Junction-to-

Ambient

hermal Resistance

Junction-to-Case

V

> V

CC

+0.2 1 µA

TH

SOT23/SOT23R (Note 2) 201 °C/W

SOT23/SOT23R (Note 2) 56 °C/W

APX803

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V

Typical Performance Characteristics

APX803/D

3-PIN MICROPROCESSOR RESET CIRCUIT

RE SE T Threshold Voltage vs. Temperature

5.0

4.5

4.0

3.5

3.0

2.5

RESET Threshold Voltage(

2.0

-50-250 255075100

APX803-26

Temperature (°C)

Figure 1

RE SE T Timeout Period vs. Temperature

250

APX803

240 230 220 210 200 190 180 170 160

RESET Timeout Period(ms)

150

-50-250 255075100

Temperature (°C)

RE SET Threshold Voltage vs. Temperature

5.0

4.5

4.0

3.5

3.0

2.5

RESET Threshold Voltage(V

2.0

-50 -25 0 25 50 75 100

APX803-44

Temperature (°C)

Figure 2

RE SE T Timeout Period vs. Temperature

3.00

APX803D

2.80

2.60

2.40

2.20

2.00

1.80

1.60

1.40

1.20

RESET Timeout Period(ms)

1.00

-50 -25 0 25 50 75 100

Temperature ( °C)

Figure 3

Supply Current vs. Temperature

30

Vcc=3. 3V

29 28 27 26 25 24 23 22

Vcc Supply Current(uA)

21 20

-50 -25 0 25 50 75 100

Temperature (°C)

40 35 30 25 20 15 10

Supply Current(uA )

5 0

0123456

Figure 5

APX803

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Figure 4

Supply Current vs. Vcc

Vcc(V)

Figure 6

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V

3-PIN MICROPROCESSOR RESET CIRCUIT

Typical Performance Characteristics (Continued)

APX803/D

Nch Driver Sink Current vs. Vcc

60

APX803- 26 VDS=0.5V

50

40

30

20

Sink Current I sink(mA )

10

0

0.0 0.5 1.0 1.5 2.0 2.5 3.0

25ºC

-40ºC

85ºC

Vcc(V)

Figure 7 Figure 8

80 70 60 50 40 30 20 10

Nch Driv er Output Current(mA)

0

Nch Driver Output C urrent vs . V

APX803-26

cc= 2.5V

cc= 2.0V

cc= 1.5V

0.0 0.5 1.0 1.5 2.0 2.5 3.0

VDS(V)

DS

Nch Driver S ink Cu rr en t vs. Vcc

60

A PX 803- 44 VDS=0.5V

50

25ºC

40

30

20

10

Sink Current Is i nk (m A )

0

0.0 1.0 2.0 3.0 4.0 5.0

-40ºC

85ºC

Vcc(V)

Nch Driver Output Current vs. V

100

APX803-44

90 80 70 60 50 40 30 20 10

Nch Driver Out p ut Current(mA)

0

0.00.51.01.52.02.53.03.54.0

Vcc= 2.0V

Vcc= 1.5V

VDS(V)

Vcc= 3.0V

Vcc= 2.5V

DS

Vcc= 4.0V

cc= 3.5V

Figure 9 Figure 10

APX803

Document number: DS32132 Rev. 2 - 2

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Timing Diagram

Vth

Vcc

Vth

T

Delay

/RESET

Vth

T

Delay

RESET

Functional Description

Microprocessors (µPs) and microcontrollers (µC) have a reset input to ensure that it starts up in a known state. The APX803/D drive the µP’s reset input to prevent code-execution errors during power-up, power-down, or brownout conditions. They assert a reset signal whenever the V preset threshold and keep it asserted for a fixed period of time after V the APX803D this period is a minimum of 1ms while for other APX803 variants it is at least 140ms. The APX803/D have an open-drain output stage.

Ensuring a Valid Reset Output Down to V

RESET

Once V keeps

this interval, occurs (V

RESET

threshold, the internal timer resets to zero, and goes low. The internal timer starts after V above the reset threshold, and the reset timeout period.

CC

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

exceeds the reset threshold, an internal timer

CC

RESET

CC

goes low. Any time VCC goes below the reset

supply voltage declines below a

CC

has risen above the reset threshold. For

CC

= 0

low for the reset timeout period; after

RESET

dips below the

goes high. If a brownout condition

RESET

reset threshold),

RESET

remains low for

CC

RESET

returns

APX803/D

3-PIN MICROPROCESSOR RESET CIRCUIT

T

Delay

T

Delay

When VCC falls below 1V, the APX803/D output no longer sinks current — it becomes an open

circuit. Therefore, high-impedance CMOS logic inputs connected to

RESET

This presents no problem in most applications since most µP and other circuitry is inoperative with VCC below 1V.

Interfacing to µP with Bidirectional Reset Pins

Since the RESET output on the APX803/D is open drain, this device interfaces easily with μP/µC that have bidirectional reset pins, such as the Motorola 68HC11. Connecting the μP supervisor’s RESET output directly to the microcontroller’s (μC’s) RESET pin with a single pullup resistor allows either device to assert reset.

Supervising and monitoring Multiple Supplies

Generally, the pull-up resistor connected to the APX803/D will connect to the supply voltage that is being monitored at the IC’s V may use the APX803/D open-drain output to level-shift from the monitored supply to reset the µP powered by a different supply voltage or monitor multiple supplies that will be fed into 1 µC/µP reset input.

can drift to undetermined voltages.

pin. However, some systems

CC

RESET

APX803

Document number: DS32132 Rev. 2 - 2

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Ordering Information

APX803/D

3-PIN MICROPROCESSOR RESET CIRCUIT

APX 8 03 - XX XX G - 7

Output type

03 : Active-Low, Open Drain

Voltage

46 : 4.63 44 : 4.38 40 : 4.00

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

Package

SA : SOT23 SR : SOT23R

Green

G : Green

Packing

7 : Tape & Reel

APX 8 03 D - 29 XX G - 7

Output type

03 : Active-Low, Open Drain

Device Package Code

APX803-XXSAG-7 SA SOT23 3000/Tape & Reel -7 APX803-XXSRG-7 SR SOT23R 3000/Tape & Reel -7 APX803D-29SAG-7 SA SOT23 3000/Tape & Reel -7 APX803D-29SRG-7 SR SOT23R 3000/Tape & Reel -7

Notes: 4. 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.

Voltage

29 : 2.93

Packaging

(Note 4)

Package

SA : SOT23 SR : SOT23R

Green

G : Green

7” Tape and Reel

Quantity Part Number Suffix

Packing

7 : Tape & Reel

APX803

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Marking Information

(1) SOT23 and SOT23R

APX803/D

3-PIN MICROPROCESSOR RESET CIRCUIT

( Top View )

XX

3

Y W

X

XX : Identification code

: Year 0~9

Y

W

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

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

X

1 2

: A~Z : Green

Device Package Identification Code

APX803-46SA SOT23 V3 APX803-44SA SOT23 V4 APX803-40SA SOT23 V5 APX803-31SA SOT23 V6 APX803-29SA SOT23 V7 APX803-26SA SOT23 V8 APX803-23SA SOT23 V9 APX803-46SR SOT23R S3 APX803-44SR SOT23R S4 APX803-40SR SOT23R S5 APX803-31SR SOT23R S6 APX803-29SR SOT23R S7 APX803-26SR SOT23R S8 APX803-23SR SOT23R S9

APX803D-29SA SOT23 VN

APX803D-29SR SOT23R SN

APX803

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3-PIN MICROPROCESSOR RESET CIRCUIT

Package Outline Dimensions (All Dimensions in mm)

(1) Package Type: SOT23 and SOT23R

APX803/D

Notes: 5. 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

APX803

Document number: DS32132 Rev. 2 - 2

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APX803/D

3-PIN MICROPROCESSOR RESET CIRCUIT

IMPORTANT NOTICE

DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION).

Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further notice to this document and any product described herein. Diodes Incorporated does not assume any liability arising out of the application or use of this document or any product described herein; neither does Diodes In corporated convey any license under its patent or trademark rights, nor the rights of others. Any Customer or user of this documen t or products described herein 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 Diodes Incorporated website, harmless against all damages.

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Products described herein may be covered by one or more United States, international or foreign p atents pending. Product names and markings noted herein may also be covered by one or more United States, international or foreign trademarks.

LIFE SUPPORT

Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express written approval of the Chief Executive Officer of Diodes Incorporated. As used herein:

A. Life support devices or systems are devices or systems which:

1. are intended to implant into the body, or

2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the labeling can be reasonably expected to result in significant injury to the user.

B. A critical component is any component in a life support device or system whose failure to perform can b e reasonably expected

to cause the failure of the life support device or to affect its safety or effectiveness.

Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support dev ices or systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any use of Diodes Incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or systems-related information or support that may be provided by Diodes Incorporated. Further, Customers must fully indemnify Diodes Incorporated and its representatives against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or systems.

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APX803

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