APX81129UG - DIODES Incorporated

APX811/812

4-Pin Microprocessor Supervisor With Manual Reset

APX811/812 Rev. 2 1 of 10 OCTOBER 2009

DS31960 www.diodes.com © Diodes Incorporated

• 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

RESET Active low(APX811)

• Push-pull RESET Active hi gh(APX812)

• Power-on reset generator with fixed d elay time 200ms

• SOT143: Available in “Green” Molding Compound

(No Br, Sb)

• Lead Free Finish/RoHS Compliant (Note 1)

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 RESET output, while the

APX812 has an active high RESET output.

The APX811/812 dev i ces inco rporate a manual reset input, MR .

A low level at MR causes RESET to become active.

The APX811/2 are targeted at 2.5V, 3V, 3.3V and 5V powered

systems and are available with different threshold voltages to

meet the exact needs of the system. They are available in the

space saving SOT143 package and operate over the whole

industrial temperature range, -40 to 85°C.

• Computers

• Controllers

• Intelligent Instruments

• Critical uP and UC power Monitoring

• Portable/Battery powered Equipment

• Automotive

Typical Application Circuit

Vcc

MCU

MR RESET

(RESET)

RESET Input

GND

APX811/APX812

Vcc

GND

Vcc

(Manual Reset)

Push Botton

Features General Description

Applications

APX811/812

4-Pin Microprocessor Supervisor With Manual Reset

APX811/812 Rev. 2 2 of 10 OCTOBER 2009

DS31960 www.diodes.com © Diodes Incorporated

APX 8 XX - XX U G - 7

Voltage Package Packing

7 : Tape & Reel

Enable Green

G : Green

U : SO T143

46 : 4.63

44 : 4.38

40 : 4.00

31 : 3.08

29 : 2.93

26 : 2.63

23 : 2.25

11 : Active-Low

12 : Active-High

7” Tape and Reel

Device Package

Code Packaging

(Not e 2) Quantity Part Number Suffix

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. 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.

1

2

4

MR

3

GND

( Top View )

Vcc

(RESET)

SOT143

RESET

Pin Name Description

GND Ground

RESET

(RESET)

Reset output Pin

L: for APX811

H: for APX812

VCC Operating Voltage Input

MR Manual reset (Active Low)

Ordering Information

Pin Assignments

Pin Descriptions

APX811/812

4-Pin Microprocessor Supervisor With Manual Reset

APX811/812 Rev. 2 3 of 10 OCTOBER 2009

DS31960 www.diodes.com © Diodes Incorporated

Block Diagram

Vcc RESET

MR

Vref

Delay Circuit Driver

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

VRESET RESET -0.3 to (Vcc+0.3) V

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 oC

APX811/812

4-Pin Microprocessor Supervisor With Manual Reset

APX811/812 Rev. 2 4 of 10 OCTOBER 2009

DS31960 www.diodes.com © Diodes Incorporated

Electrical Characteristics (TA = 25ºC)

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

Symbol Parameter Test Conditions Min Typ. Max Unit

VCC V

CC Range 1.0 5.5 V

ICC Supply Current Vth + 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

3.03 3.08 3.13 V

3.94 4.00 4.06 V

4.31 4.38 4.45 V

Vth Reset threshold TA =25 oC.

4.56 4.63 4.70 V

ts Set-up Time VCC = Vth to (Vth – 100mV) 20 µs

VCC = Vth -0.2, ISINK = 1.2mA 0.3

VCC = Vth -0.2, ISINK = 3.2mA 0.4

VOL TRESE Outp ut Vol tage Lo w

(APX811) VCC > 1.0V, ISINK = 50uA 0.3 V

VCC > Vth +0.2,

ISOURCE = 500uA 0.8VCC

VOH TRESE Output Voltage-High

(APX811) VCC > Vth +0.2,

ISOURCE = 800uA VCC –1.5

V

VCC = Vth +0.2 , ISINK = 1.2mA 0.3

VOL RESET Output Voltage-Low

(APX812) VCC = Vth +0.2 , ISINK = 3.2mA 0.4

V

VOH RESET Output Voltage-High

(APX812) 1.8V < VCC < Vth -0.2,

ISOURCE = 150uA 0.8 VCC V

θJA Thermal Resistance

Junction-to-Ambient SOT143 (Note 3) 240 oC/W

θJC

T

hermal Resistance

Junction-to-Case SOT143 (Note 3) 71 oC/W

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

Timing requirements (TA=25oC)

Symbol Parameter Test Conditions Min Typ. Max Unit

tW Pulse Width at MR VCC> Vth-+0.2V , VIL=0.3

×

VCC, VIH=0.7

×

VCC 100 - - ns

APX811/812

4-Pin Microprocessor Supervisor With Manual Reset

APX811/812 Rev. 2 5 of 10 OCTOBER 2009

DS31960 www.diodes.com © Diodes Incorporated

Switching Characteristics (TA=25oC)

Symbol Parameter Test Conditions Min Typ. Max Unit

td Delay Time APX811/812 VCC> Vth-+0.2V,

See timing diagram 140 200 280 ms

MR to RESET

delay (APX811/812)

VCC> Vth-+0.2V,

VIL=0.3

×

VCC,

VIH=0.7

×

VCC - - 0.1 µs

tPHL Propagation ( Delay) Time,

High-to-low-level Output VCC to RESET delay VIL= Vth--0.2V,

VIH= Vth-+0.2V - - 25 µs

MR to RESET delay

(APX811/812)

VCC> Vth-+0.2V,

VIL=0.3

×

VCC,

VIH=0.7

×

VCC - - 0.1 µs

tPLH Propagation ( Delay) Time,

Low-to-high-level Outp ut VCC to RESET delay

(APX811/812) VIL= Vth--0.2V,

VIH= Vth-+0.2V - - 25 µs

Timing Diagram

Vth

/RESET

Vth

RESET

td

Vcc

RESET vs. Vcc Timing Diagram

tdtd

td

/MR

Vcc

Vth

/RESET

RESET vs. /MR Timing Diagram

td

APX811/812

4-Pin Microprocessor Supervisor With Manual Reset

APX811/812 Rev. 2 6 of 10 OCTOBER 2009

DS31960 www.diodes.com © Diodes Incorporated

Typical Performance Characteristics

RESET Timeout Period vs. Temperature

150

160

170

180

190

200

210

220

230

240

250

-40℃ -25℃ 0℃ 25℃ 50℃ 85℃ 105℃ 125℃

Temperature

RESET Ti meou t Perio d (ms

)

RESE T Threshold Voltage vs. Temperature

2.8

2.85

2.9

2.95

3

3.05

3.1

3.15

3.2

-40℃ -25℃ 0℃ 25℃ 50℃ 85℃ 105℃ 125℃

Temperature

RESET T h ersho l d Vo l tage (V

)

V cc S up ply Current vs. T emperature

(V cc= 3.3V V th=2. 93V )

25

26

27

28

29

30

31

32

33

34

35

-40℃ -25℃ 0℃ 25℃ 50℃ 85℃ 105℃ 125℃

Temperature

Vcc Supply Current (µA

)

Supply C urreny v s. Vcc

0

5

10

15

20

25

30

35

40

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

Vcc

Supply Current (µA

)

APX811/812

4-Pin Microprocessor Supervisor With Manual Reset

APX811/812 Rev. 2 7 of 10 OCTOBER 2009

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 VCC supply voltage declines below a

preset threshold or the MR pin is brought low, keeping it asserted for at least 240ms after VCC has risen above the reset threshold. 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 VCC > 1V. Once VCC exceeds the

reset threshold, an internal timer keeps RESET output low (and RESET high for the APX812) for the reset timeout period. After this

interval, the APX811’s RESET output goes high (APX812’s RESET output goes low). If a brownout condition occurs (VCC dips below the

reset threshold), the APX811’s RESET output goes low (APX812’s RESET output goes high). Any time VCC goes below the reset

threshold, the internal timer resets to zero, and RESET goes low (RESET goes high). The internal timer starts after VCC returns above

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

Ensuring a Valid Reset Output Down to VCC = 0

When VCC falls below 1V, the APX811 RESET no longer sinks current-— it becomes an open circuit. Therefore, high-impedance

CMOS logic inputs connected to RESET can drift to undetermined voltages. This presents no problem in most applications since most

µP and oth er ci r cuit ry is inop er ativ e with VCC below 1V. However, in applications where RESET mu st be val id down to 0V, a d ding a pull

down resistor to RESET causes any stray leakage currents to flow to ground, holding RESET low. R1’s value is not critical; 100k is

large enough not to load RESET and small enough to pull RESET to ground.

For the APX812 if RESET is required to remain valid for VCC < 1V then a 100kΩ pull-up resistor between RESET and VCC is

recommended.

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 nominal supp ly ±5%, this leav es a zone of uncertainty where the supp ly is betw een 5% and 10% low , and where th e reset may or may

not be asserted.

APX811/812

4-Pin Microprocessor Supervisor With Manual Reset

APX811/812 Rev. 2 8 of 10 OCTOBER 2009

Marking Information

(1) SOT143

1 2

3

XX Y W

X

( Top View )

XX : Identification code

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

X : A~Z : Green

Y : Year 0~9

a~z : 27~52 week; z represents

52 and 53 week

4

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

APX811/812

4-Pin Microprocessor Supervisor With Manual Reset

APX811/812 Rev. 2 9 of 10 OCTOBER 2009

Package Information (All Dimensions in mm)

(1) P ackage Type: SOT143

1.20/1.40

2.28/2.48

2.80/3.0

1.58/1.83

1.78/2.03

0.89/1.0

0.37/0.51

0.77/0.93

0.013/0.10

0.46/0.6

0.085/0.18

8°typ.

0.45/0.6

APX811/812

4-Pin Microprocessor Supervisor With Manual Reset

APX811/812 Rev. 2 10 of 10 OCTOBER 2009

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