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

RESET

GND

1

2

2

1

2

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

V

CC

CC

APX803

Document number: DS32132 Rev. 2 - 2

V

V

REF

REF

Delay timeOscillator

Delay timeOscillator

APX803/D

APX803/D

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RESET

RESETRESET

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© Diodes Incorporated

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

APX803

Document number: DS32132 Rev. 2 - 2

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© Diodes Incorporated

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

T

V

V

+ 0.2V 30 40 μA

TH

= 25oC

A

– V

TH-H

CC

A

CC

CC

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

Document number: DS32132 Rev. 2 - 2

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© Diodes Incorporated