AP1701EW [ANACHIP]

3-Pin Microprocessor Reset Circuits; 3引脚微处理器复位电路


型号：	AP1701EW
厂家：	ANACHIP CORP
描述：	3-Pin Microprocessor Reset Circuits 3引脚微处理器复位电路电源电路电源管理电路微处理器复位电路
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AP1701/2/3/4

3-Pin Microprocessor Reset Circuits

Features

General Description

- Precision Monitoring of +3V, +3.3V, and +5V

Power-Supply Voltages

The AP1701/2/3/4 are 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.

- Fully Specified Over Temperature

- Available in Three Output Configurations

- Push-Pull RESET Low Output (AP1701/3)

- Push-Pull RESET High Output (AP1702/4)

- 140ms min Power-On Reset Pulse Width

- 12µA Supply Current

These circuits 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 140ms after VCC has risen

above the reset threshold. Reset thresholds

suitable for operation with a variety of supply

voltages are available. The AP1701/2/3/4 have

push pull outputs. The AP1701/3 have an active low

RESET output, while the AP1702/4 has an active

high RESET output. The reset comparator is

designed to ignore fast transients on VCC, and the

outputs are guaranteed to be in the correct logic

state for VCC down to 1V. Low supply current

makes the AP1701/2/3/4 ideal for use in portable

equipment. The AP1701/2/3/4 is available in a 3-pin

SOT23 package.

- Guaranteed Reset Valid to VCC = +1V

- Power Supply Transient Immunity

- No External Components

- 3-pin SOT23 package

Applications

- Computers

- Controllers

- Intelligent Instruments

- Critical µP and µC Power Monitoring

- Portable/Battery Powered Equipment

- Automotive

Pin Assignments

Pin Descriptions

(Top View)

Name

Description

GND

Ground

GND

Reset output pin

L: for AP1701/3

H: for AP1702/4

AP1701

AP1702

RESET

V_CC

(RESET)

V_CC

Operating voltage input

RESET (RESET)

SOT-23

(Top View)

RESET (RESET)

GND

AP1703

AP1704

V_CC

SOT-23

This datasheet contains new product information. Anachip Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of

this product. No rights under any patent accompany the sale of the product.

Rev.1.0 May. 7, 2004

1/8

AP1701/2/3/4

3-Pin Microprocessor Reset Circuits

Ordering Information

AP170X X X X

Enable

Voltage

Package

W:SOT23

Lead Free

Blank : Normal

L : Lead Free Package

A: 4.63

B: 4.38

C: 4.00

D: 3.08

E: 2.93

F: 2.63

1: Active-Low

2: Active-High

3: Active-Low

4: Active-High

Absolute Maximum Ratings

Symbol

V_CC

Parameter

Terminal Voltage (with respect to GND)

Rating

-0.3 to +6.0

Unit

V_RESET

I_CC

I_O

-0.3 to (V_CC+ 0.3)

RESET, RESET (push-pull)

Input Current, V_CC

100

V/µS

Output Current, RESET, RESET

Rate of Rise, V_CC

V_R

Continuous Power Dissipation (T_A= +70°C),

P_D

320

de-rate 4mW/°C above +70°C

T_OP

T_ST

T_LEAD

Operating Temperature Range

Storage Temperature Range

Lead Temperature (soldering, 10s)

-40 to +105

-65 to +150

+300

°C

Anachip Corp.

www.anachip.com.tw

Rev.1.0 May.7, 2004

2/8

AP1701/2/3/4

3-Pin Microprocessor Reset Circuits

Electrical Characteristics (T_A=25ºC)

Symbol

V_CC

Parameter

V_CCRange

Conditions

Min.

1.0

Typ.

Max.

5.5

Unit

T_A= 0^oC to +70^oC

V_CC< 5.5V

V_CC< 3.6V

µA

I_CC

Supply Current

AP1701/2/3/4A

AP1701/2/3/4B

AP1701/2/3/4C

AP1701/2/3/4D

AP1701/2/3/4E

AP1701/2/3/4F

4.54

4.29

3.92

3.02

2.87

2.57

4.63

4.38

4.00

3.08

2.93

2.63

4.72

4.47

4.08

3.14

2.99

2.68

Reset Threshold

T_A=25ºC

V_TH

Reset Threshold

Tempco

ppm/^oC

µs

V_CCto Reset Delay V_CC= V_THto (V_TH– 100mV)

T_DELAY

Reset Active

T_A= 0^oC to +70^oC

100

240

380

Timeout Period

V_CC= V_THmin, I_SINK= 1.2mA, AP1701/3

0.3

0.4

0.3

RESET Output

Voltage Low

V_OL

V_CC= V_THmin, I_SINK= 3.2mA

V_CC> 1.0V, I_SINK= 50uA

V_CC

AP1701/3

V_CC> V_THmax, I_SOURCE= 800uA

> V_THmax, I_SOURCE= 500uA,

0.8V_CC

RESET Output

Voltage-High

V_OH

V_CC–1.5

V_CC= V_THmax, I_SINK= 1.2mA, AP1702/4

V_CC= V_THmax, I_SINK= 3.2mA

0.3

0.4

RESET Output

Voltage-Low

V_OL

V_OH

RESET Output

1.8V < V_CC< V_THmin, I_SOURCE= 150uA,

0.8 V_CC

Voltage-High

AP1702/4

Application Circuit

VCC

Microprocessor

AP170X

RESET

INPUT

RESET

(RESET)

GND

Anachip Corp.

www.anachip.com.tw

Rev.1.0 May.7, 2004

3/8

AP1701/2/3/4

3-Pin Microprocessor Reset Circuits

Function Description

When VCC falls below 1V, the AP1701/3 RESET

output 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 other circuitry is inoperative with VCC

below 1V. However, in applications where RESET

must be valid down to 0V, adding 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 AP1702/4 if RESET is required to

remain valid for VCC < 1V.

A microprocessor’s (µP’s) reset input starts the µP

in a known state. The AP1701/2/3/4 assert 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, keeping it

asserted for at least 140ms after VCC has risen

above the reset threshold. The AP1701/2/3/4 have

a push-pull output stage.

Applications Information

Negative-Going VCC Transients

In addition to issuing a reset to the µP during

power-up, power-down, and brownout conditions,

the AP1701/2/3/4 are relatively immune to

short-duration negative-going VCC transients

(glitches).

The AP1701/2/3/4 do not generate a reset pulse.

The graph was generated using a negative going

pulse applied to VCC, starting 0.5V above the

actual reset threshold and ending below it by the

magnitude indicated (reset comparator overdrive).

The graph indicates the maximum pulse width a

negative going VCC transient can have without

causing a reset pulse. As the magnitude of the

transient increases (goes farther below the reset

threshold), the maximum allowable pulse width

decreases. Typically, a VCC transient that goes

100mV below the reset threshold and lasts 20µs or

less will not cause a reset pulse. A 0.1µF bypass

capacitor mounted as close as possible to the VCC

pin provides additional transient immunity.

Benefits of Highly Accurate Reset Threshold

Most µP supervisor ICs have reset threshold

voltages between 5% and 10% below the value of

nominal sup-ply 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 supply

±5%, this leaves a zone of uncertainty where the

supply is between 5% and 10% low, and where the

reset may or may not be asserted.

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 timer keeps RESET low for the reset

timeout period; after this interval, RESET goes

high. If a brownout condition occurs (VCC dips

below the reset threshold), 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 remains low for

the reset timeout period.

Anachip Corp.

www.anachip.com.tw

Rev.1.0 May.7, 2004

4/8

AP1701/2/3/4

3-Pin Microprocessor Reset Circuits

Function Block

Driver

Delay Circuit

RESET

/ RESET

REF

Performance Characteristics

Threshold

2.928

2.926

2.924

2.922

2.92

-40

80 90

-30 -20 -10

30 40 50 60 70

²⁰Temp

-50 -40 -30 -20 -10

30 40 50 60 70 80 90 100 110 120

²T⁰emp ( C )

Iq v.s Temp

Threshold v.s. Temp

Anachip Corp.

www.anachip.com.tw

Rev.1.0 May.7, 2004

5/8

AP1701/2/3/4

3-Pin Microprocessor Reset Circuits

Timing Diagram

V_TH

V_CC

Active Low

Active High

Giltch Immunity

3500

3000

2500

2000

1500

1000

500

3000

900

270

140

100 200 300 400 500 600 700 800 900 1000 1100

RESET COMPARATOR OVERDRIVE(mV)

Anachip Corp.

www.anachip.com.tw

Rev.1.0 May.7, 2004

6/8

AP1701/2/3/4

3-Pin Microprocessor Reset Circuits

Marking Information

(Top View)

Blank: normal

L: Lead Free Package

XX Y M X

Identification code

( See appendix )

Month: A~L

Year:0~9

SOT23-3L

Appendix

Part

Identification

Part

Identification

Number

AP1701A

AP1701B

Code

Number

AP1703A

AP1703B

Code

AP1701C

AP1701D

AP1701E

AP1701F

AP1702A

AP1702B

AP1702C

AP1702D

AP1702E

AP1702F

AP1703C

AP1703D

AP1703E

AP1703F

AP1704A

AP1704B

AP1704C

AP1704D

AP1704E

AP1704F

Anachip Corp.

www.anachip.com.tw

Rev.1.0 May.7, 2004

7/8

AP1701/2/3/4

3-Pin Microprocessor Reset Circuits

Package Information

Package Type: SOT23-3L

Dimensions In Millimeters

Dimensions In Inches

Symbol

Min.

Nom.

Max.

Min.

Nom.

Max.

1.00

0.00

1.00

0.35

0.10

2.70

1.40

1.70

2.40

0.30

1.20

1.40

0.10

1.30

0.50

0.25

3.10

1.80

2.30

3.00

0.55

0.039

0.000

0.039

0.014

0.004

0.106

0.055

0.067

0.094

0.012

0.047

0.055

0.004

0.051

0.020

0.010

0.122

0.071

0.091

0.118

0.022

1.15

0.045

0.175

2.90

1.60

2.00

2.70

0.007

0.114

0.063

0.079

0.106

Anachip Corp.

www.anachip.com.tw

Rev.1.0 May.7, 2004

8/8

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