HT9200B-14SLF - HOLTEK SEMICONDUCTOR

APX803S

Document number: DS39161 Rev. 2 - 2

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January 2017

APX803S

NEW PRODUCT

3-PIN MICROPROCESSOR RESET CIRCUIT

Description

The APX803S

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 5.0V, 3.3V, 3.0V and

2.5V powered circ uits.

These circuits perf orm a single function: they assert a reset signal on

power up and whenever the VCC

supply voltage declines below a

preset threshold, keeping

it asserted for a fixed period of time after

VCC has risen above the reset threshold. For the APX803S

this period

is a minimum of 1ms while for other APX803S

variants it is at least

140ms. The reset comparator is designed to ignore fast transients on

VCC,

and the outputs are guaranteed to be i n t he correc t logi c st ate for

VCC down to 1V.

The APX803S

is available with different reset thresholds suitable for

operation with a variety of supply voltages. The APX803S has

an

open drain active low

RESET

output and compliment Diodes

APX809S/810S which have push-

pull output stages. Low supply

current m akes the APX803S

ideal for use in portable equipment. The

APX803S is available in two pin out variants of the 3-

pin SOT23

package.

Features

• Precision Monitoring of 2.5V, 3.0V, 3.3V, and 5.0V Power-

Supply

Voltages

• Fully Specified Over Tem perature

• Open-drain

RESET

Active Low

• Power-On/Power Supply Glitch Reset Pulse

 APX803S00 1.7ms (Typ .)

 APX803S05 50ms (Typ.)

 APX803S 240ms (Typ.)

• 10µA Supply Current (Typ.)

• Guaranteed Reset Vali d to VCC = 1V

• Totally Lead-Free & Fully RoHS Compliant (Note 1 & 2)

• Halogen and Antimony Free. “Green” Device (Note 3)

Pin Assignments

(Top View)

1

2

GND

VCC

APX803S

2

3

RESET

SOT23 (SA Package)

(Top View)

1

2

GND

V

CC

APX803S

2

3

RESET

SOT23 (SR Package)

Applications

• Computers

• Controllers

• Intelligent Instruments

• Critical µP and µC Power Monitoring

• Portable/Batt ery Powered Equipment

Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.

2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"

and Lead -free.

3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and

<1000ppm antimony compounds.

APX803S

Document number: DS39161 Rev. 2 - 2

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January 2017

APX803S

NEW PRODUCT

Typical Applications Circuit

APX803S

GND

RESET

V

CC

Microprocessor

V

CC

GND

RESET

INPUT

V

CC

C

IN

100nF

Pin Descriptions

Pin Number Pin Name Description

SOT23 (SA Package) SOT23 (SR Package)

1 2 GND Ground

2 1

RESET

Reset Output Pin

Active Low Open Drain

3 3 VCC Operating Voltage Input

Functional Block Diagram

Absolute Ma ximum Ratings (@TA = +25°C, unless otherwise specif i ed. )

Symbol

Parameter

Rating

Unit

ESD HBM Human Body Model ESD Protection 3 kV

ESD MM

Machine Model ESD Protection

400

V

ESD CDM Charged Device Model ESD Protect i on 1500 V

VCC

Supply Voltage

-0.3 to +6.0

V

VRESET

RESET

(Open Drain) -0.3 to 6 V

ICC Input Current, VCC 20 mA

I

O

Output Current,

RESET

20

mA

θJA Thermal Resistanc e Junction-to-Ambient (SOT23 Package) 232 °C/W

θ

JC

Thermal Resistanc e Junction-to-Case (SOT23 Package)

87

°C/W

TJ Junction Temperature +150 °C

T

ST

Storage Temperature Range

-65 to +150

°C

dVCC/dt

V

CC

Rate of Rise (V

CC

= 0 to V

T

)

100 V/µs

S

APX803S

Document number: DS39161 Rev. 2 - 2

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APX803S

NEW PRODUCT

Recommended Operating Conditions (@TA = +25°C, unless otherwise specified.)

Symbol

Parameter

Min

Max

Unit

VCC

Supply Voltage

1.0

5.5

V

RESET

Output Voltage

0 5.5 V

T

A

Operating Ambient Temperature Range

-40

+85

°C

Electrical Characteristics (Typical values are @ TA = +25°C, unless otherwise specified.)

Symbol Parameter Test Conditions Min Typ. Max Unit

ICC

Supply Current

VTH + 0.2V

— 10 15 μA

VTH Reset Threshold

APX803SXX-23

TA = +25°C

2.21 2.25 2.30

V

APX803SXX-26 2.59 2.63 2.67

APX803SXX-29 2.89 2.93 2.97

APX803SXX-31 3.04 3.08 3.13

APX803SXX-40 3.94 4.00 4.06

APX803SXX-44 4.31 4.38 4.45

APX803SXX-46 4.56 4.63 4.70

—

Reset Threshold Tempco

TA

= -40°C to +85°C

— 30 — ppm/°C

tS VCC to

RESET

Delay VCC = VTH to (VTH – 100mV) — 20 — µs

tDELAY Reset Active

Timeout Period

APX803S-XX VCC ≥ 1.02 x VTH 140 240 280 ms APX803S05-XX 20 50 70

APX803S00-XX 1 1.7 3.3

VOL

RESET

Output Voltage Low

VCC = VTH -0.2V, ISINK = 1.2mA — — 0.3 V

VCC = VTH -0.2V, ISINK = 3.5mA

— — 0.4

VCC > 1 .0V, ISINK = 50µA — — 0.3

IOH

RESET

Output High Leakage Current VCC > VTH +0.2V — — 1 µA

APX803S

Document number: DS39161 Rev. 2 - 2

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APX803S

NEW PRODUCT

Performance Characteristics

-40 -20 020 40 60 80

2.88

2.90

2.92

2.94

2.96

2.98

3.00

Reset Threshold Voltage (V)

Temperature (

O

C)

V

CC_Rise

V

CC_Fall

APX803S

Reset Threshold Voltage vs. Temperature

-40 -20 020 40 60 80

1.4

1.6

1.8

2.0

2.2

2.4

2.6

Reset Active Timeout Period (ms)

Temperature (

O

C)

APX803S-29

Reset Active Timeout Period vs. Temperature

-40 -20 020 40 60 80

0

2

4

6

8

10

12

Suuply Current (µA)

Temperature (

O

C)

VCC = 3.3 V

Supply Current vs. Tem perature

123456

0

2

4

6

8

10

12

Supply Current (µA)

Supply Voltage (V)

Supply Current vs. Supply Voltage

T

A

= 25

O

C

0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5

0

10

20

30

40

50

60

Output Sink Current (m A)

Supply Voltage (V)

T

A

= - 40

O

C

T

A

= 25

O

C

T

A

= 85

O

C

APX803S-29

V

DS

=0.5V

Output Sink Current vs. Supply Voltage

0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5

0

10

20

30

40

50

60

70

80

Output Sink Current (mA )

VDS (V)

V

CC

= 1.5 V

V

CC

= 2.0 V

V

CC

= 2.5 V

V

CC

= 2.8 V

APX803S-29

Output Sink Current vs. VDS

APX803S

Document number: DS39161 Rev. 2 - 2

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APX803S

NEW PRODUCT

Timing Diagram

Vth

/RESET

RESET

T

Delay

T

Delay

T

Delay

T

Delay

Vcc

Vth

Functional Description

Microprocessors (µPs) and microcontroll ers (µ C) have a reset input to ensure that it st arts up in a known state. The APX803S drive the µP’s reset

input to prevent code-executi on errors during power-up, power-do wn, or brownout condit ions. T hey assert a reset signal whenever the VCC supply

voltage declines below a preset threshold and keep it asserted for a fixed period of time after VCC has risen above the reset threshold. For the

APX803S00 this period is a minimum of 1ms while for other APX803S variants it is at least 140ms. The APX803S has an open-drain output stage.

Ensuring a Valid Reset Output Down to VCC = 0

RESET

is guaranteed to be a logic low for VCC > 1V. Once VCC exceeds the reset threshold, an internal t imer keeps

RESET

low for the reset

timeout period; after this interval,

RESET

goes high. If a brownout condition occurs (VCC dips below the

RESET

reset thres hold),

RESET

goes

low. Any time VCC goes below the reset threshold, the internal timer resets to zero, and

RESET

goes low. The internal timer starts after VCC

returns above the reset threshold, and

RESET

rema ins low for the reset timeout period.

When VCC fal ls below 1V, the APX803S

RESET

output no longer s inks current — it becomes an open circuit. Therefore, high-im pedance CMOS

logic inputs connected to

RESET

can drift to undetermined voltages.

This presents no problem in most applicati ons since most µP and other circuitry is i noperative with VCC below 1V.

Interfacing to µP with Bidirectional RESET Pins

Since the RESET output on the APX803S is open drain, this device interfaces easily with μP/µC that has bidirectional RESET pi ns, such as the

Motorola 68HC11.

Connecting the μP supervisor’s RESET output directly to the microcontroller’s (μC’s) RESET pin with a single pull-up resistor all ows either device

to assert reset.

Supervising and Monitoring Mul t iple Su ppl ies

Generally, the pull-up resistor connected to the APX803S will connect to the supply voltage that is being monitored at the IC’s VCC pin. However,

some systems may use the APX803S open-drain output to level-shift from the monitored supply to reset the µP powered by a different supply

voltage or monitor multipl e suppl i es that will be fed into 1 µC/µP reset input.

tDELAY

VTH

tDELAY

APX803S

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APX803S

NEW PRODUCT

Functional Description (Cont.)

Selection of Voltage Divider Value (Take APX803S00-29SA-7 as example)

APX803S

RESET

Microprocessor

RESET

INPUT

R1

R2

R3

V

IN

V

CC

V

CC

GND GND

When VCC just rises up to the VTH value (2.93V in this case), the internal oscillator will start working, which may pull some considerable current

from the source voltage, such as 60µA or s o. T ake above topology as real applicat ion example, bel ow equation required t o meet t o make sure the

IC boot up smoothly. Given VCC = 13.2V and R3 = 100kΩ, an appropriate R1/R2 value combination would be R1 = 15.6kΩ and R2 = 7.3kΩ.

Note: RIN is defined as equivalent input resistance of APX803S00-29, 51.4kΩ derived by 2.93V/57µA in this case.

Ordering Information

APX803S X - X X - X

Packing

Voltage

SA/SR : SOT23 7 : Tape & Reel

03: Active Low,

Open Drain

Reset Active

Timeout Period

Output Type

Blank : 240ms

00 : 1.7ms

05 : 50ms

23 : 2.25V

⁞

46 : 4.63V

Package

Part Number Package Code Packaging

(Note 4)

7” Tape and Reel

Quantity

Part Number Suffix

APX803SXX-XXSA-7 SA SOT23 3000/Tape & Reel -7

APX803SXX-XXSR-7 SR SOT23 3000/Tape & Reel -7

Note: 4. Pad layout as shown in Di odes Incorporated’s package outline PDFs, which can be found on our website at

http://www.diodes.com/package-outlines.html.

APX803S

Document number: DS39161 Rev. 2 - 2

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APX803S

NEW PRODUCT

Marking Information

(1) SOT23

12

3

XX YW X

( Top View )

XX : Identification code

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

X : Internal code

Y : Year 0~9

a~z : 27~52 week; z represents

52 and 53 week

Device

Package

Identification Code

APX803S-46SA

SOT23

V3

APX803S-44SA

SOT23

V4

APX803S-40SA

SOT23

V5

APX803S-31SA

SOT23

V6

APX803S-29SA

SOT23

V7

APX803S-26SA

SOT23

V8

APX803S-23SA

SOT23

V9

APX803S-46SR

SOT23

S3

APX803S-44SR

SOT23

S4

APX803S-40SR

SOT23

S5

APX803S-31SR

SOT23

S6

APX803S-29SR

SOT23

S7

APX803S-26SR

SOT23

S8

APX803S-23SR

SOT23

S9

APX803S00-46SA SOT23 VA

APX803S00-44SA SOT23 VB

APX803S00-40SA SOT23 VC

APX803S00-31SA

SOT23

VD

APX803S00-29SA

SOT23

VE

APX803S00-26SA

SOT23

VF

APX803S00-23SA

SOT23

VG

APX803S00-46SR

SOT23

VH

APX803S00-44SR

SOT23

VJ

APX803S00-40SR

SOT23

VK

APX803S00-31SR

SOT23

VM

APX803S00-29SR

SOT23

VS

APX803S00-26SR

SOT23

VT

APX803S00-23SR

SOT23

VU

APX803S05-46SA

SOT23

VV

APX803S05-44SA

SOT23

VW

APX803S05-40SA

SOT23

VX

APX803S05-31SA

SOT23

VY

APX803S05-29SA

SOT23

VZ

APX803S05-26SA SOT23 WA

APX803S05-23SA SOT23 WB

APX803S05-46SR SOT23 WC

APX803S05-44SR

SOT23

WD

APX803S05-40SR

SOT23

WE

APX803S05-31SR

SOT23

WF

APX803S05-29SR

SOT23

WG

APX803S05-26SR

SOT23

WH

APX803S05-23SR

SOT23

WZ

APX803S

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APX803S

NEW PRODUCT

Package Ou t lin e Dim en sio ns

Please se e http://www.diodes.com/package-outlines.html for the latest version.

SOT23

Dim

Min

Max

Typ

A

0.37

0.51

0.40

B

1.20

1.40

1.30

C

2.30

2.50

2.40

D

0.89

1.03

0.915

F

0.45

0.60

0.535

G

1.78

2.05

1.83

H

2.80

3.00

2.90

J

0.013

0.10

0.05

K

0.890

1.00

0.975

K1

0.903

1.10

1.025

L

0.45

0.61

0.55

L1

0.25

0.55

0.40

M

0.085

0.150

0.110

a

0°

8°

--

All Dimensions in mm

Suggested Pad Layout

Please see http://www.diodes.com/package-outlines.html for the latest version.

SOT23

Dimensions

Value (in mm)

C

2.0

X

0.8

X1

1.35

Y

0.9

Y1

2.9

J

K1 K

L1

GAUGE PLANE

0.25

H

L

M

All 7°

A

CB

D

G

F

a

X

Y

Y1 C

X1

APX803S

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APX803S

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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 Incorporated convey any license under its patent or

trademark rights, nor t he rights of others. Any Customer or user of this document or products desc ribed herein in such applic ations s hall 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, harml ess against all damages.

Diodes Incorporated does not warrant or accept any li ability whatsoever in respect of any products purchased through unauthorized sales channel.

Should Customers purchase or use Diodes Incorporated products for any unintended or unauthorized application, Customers shall indemnify and

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indirect l y, any claim of personal injury or death associated with such unintended or unauthori zed appli cat i on.

Products descri bed herein may be covered by one or more United Stat es, international or forei gn patents pending. Pr oduct names and m arkings

noted herein may also be covered by one or more United States, international or forei gn trademarks.

This document is written i n English but may be translated into multiple l anguages for reference. Only the English version of this document is the

final and determinative f orm at released by Diodes I ncorporat ed.

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Diodes Incorporated products are specificall y not authorized for use as critical components in life support devic es or systems without the express

written approval of the Chief Executive Off icer of Diodes I ncorporated. 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 signific ant injury to the user.

B. A critical component is any component in a life support device or system whose fail ure to perform can be 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 t he safety and regulatory ramif ications of their l ife support devices or systems, and

acknowledge and agree that they are solely responsible for all legal, regulatory and safety -related requirem ents concerning their products and any

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