AP1701DWG-7 [DIODES]

3-PIN MICROPROCESSOR RESET CIRCUITS; 3引脚微处理器复位电路


型号：	AP1701DWG-7
厂家：	DIODES INCORPORATED
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光电二极管
文件：	总9页 (文件大小：109K)
中文：	中文翻译
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AP1701/2/3/4

3-PIN MICROPROCESSOR RESET CIRCUITS

General Description

Features

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.

•

Precision Monitoring of +2.5V, +3V, +3.3V, and +5V

Power-Supply Voltages

Fully Specified Over Temperature

Available in three Output Configurations

•

Push-PullRESET Low Output (AP1701/3)

These circuits perform a single function: they assert a reset

signal whenever the V_CCsupply voltage declines below a preset

threshold, keeping it asserted for at least 240ms after V_CChas

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

•

Push-Pull RESET High Output (AP1702/4)

200ms Min. Power-On Reset Pulse Width

20µA Supply Current (Typ.)

Guaranteed Reset Valid to V = +1V

Power Supply Transient Immunity

No External Components

Green Package: SC59-3L

Lead Free Finish / RoHS Compliant (Note1)

active low RESET output, while the AP1702/4 has an active

high RESET output. The reset comparator is designed to ignore

fast transients on V_CC, and the outputs are guaranteed to be in

the correct logic state for V_CCdown 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 SC59 package.

Applications

•

Computers

Controllers

Intelligent Instruments

Critical µP and µC Power Monitoring

Portable/Battery Powered Equipment

Automotive

Ordering Information

AP170X X X X X

Lead Free

Enable

Voltage

Package

Packing

A : 4.63

B : 4.38

C : 4.00

D : 3.08

E : 2.93

F : 2.63

G : 2.25

-7 : Taping

: SC59

L : Lead Free

G : Green

1 : Active-Low

2 : Active-High

3 : Active-Low

4 : Active-High

Notes: 1. RoHS revision 13.2.2003. Glass and High Temperature Solder Exemptions Applied, see EU Directive Annex Notes 5 and 7.

Package Packaging

7” Tape and Reel

Device

Code

(Note 2)

Quantity

Part Number Suffix

AP170XXW

SC59

3000/Tape & Reel

-7

Notes: 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.

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3-PIN MICROPROCESSOR RESET CIRCUITS

Pin Assignments

(Top View)

GND

RESET (RESET)

AP1701

AP1702

AP1703

V_CC

AP1704

GND

RESET (RESET)

SC59-3L

Pin Descriptions

Name

Description

GND

Ground

Reset Output Pin

L: for AP1701/3

H: for AP1702/4

RESET

(RESET)

V_CC

Operating Voltage Input

Absolute Maximum Ratings

Symbol

V_CC

Parameter

Terminal Voltage (with respect to GND)

Rating

Unit

-0.3 to +6.0

V_RESET

I_CC

-0.3 to (V_CC+ 0.3)

RESET, RESET (push-pull)

Input Current, V_CC

I_O

Output Current, RESET, RESET

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

de-rate 4mW/°C above +70°C

P_D

320

T_OP

T_ST

Operating Junction Temperature Range

Storage Temperature Range

-40 to +105

-65 to +150

°C

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3-PIN MICROPROCESSOR RESET CIRCUITS

Electrical Characteristics (T_A= 25ºC)

Symbol

Parameter

V_CCRange

Supply Current V_TH+ 1.0V

AP1701/2/3/4A

Conditions

Min.

Typ.

Max. Unit

V_CC

I_CC

T_A= 0^oC to +70^oC

1.0

5.5

µA

4.54

4.29

3.92

3.02

2.87

2.57

2.20

4.63

4.38

4.00

3.08

2.93

2.63

2.25

4.72

4.47

4.08

3.14

2.99

2.68

2.30

AP1701/2/3/4B

AP1701/2/3/4C

AP1701/2/3/4D

AP1701/2/3/4E

AP1701/2/3/4F

AP1701/2/3/4G

Reset Threshold

T_A= 25ºC

V_TH

Reset Threshold

Tempco

ppm/

^oC

T_S

Set-up Time

Reset Active

Timeout Period

V_CC= 0 to (V_TH– 100mV)

T_A= 0^oC to +70^oC

100

µs

T_DELAY

240

600

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

V_CC= V_THmin, I_SINK= 3.2mA

0.3

0.4

0.3

RESET Output

Voltage Low

V_OL

V_OH

V_CC> 1.0V, I_SINK= 50uA

V_CC> V_THmax, I_SOURCE= 500uA, AP1701/3

0.8V_CC

RESET Output

Voltage-High

V_CC> V_THmax, I_SOURCE= 800uA

V_CC–1.5

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

Voltage-Low

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

Voltage-High AP1702/4

0.3

0.4

V_OL

V_OH

V_CC= V_THmax, I_SINK= 3.2mA

0.8 V_CC

Typical Application Circuit

V_CC

Cin

0.1uF

V_CC

Microprocessor

AP170X

RESET

INPUT

RESET

(RESET)

GND

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3-PIN MICROPROCESSOR RESET CIRCUITS

Function Description

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 V_CC

supply voltage declines below a preset threshold, keeping it

asserted for at least 240ms after V_CChas risen above the reset

threshold. The AP1701/2/3/4 have a push-pull output stage.

below the reset threshold), RESET goes low. Any time V_CC

goes below the reset threshold, the internal timer resets to zero,

and RESET goes low. The internal timer starts after V_CC

returns above the reset threshold, and RESET remains low

for the reset timeout period.

Applications Information

Negative-Going V_CCTransients

When V_CCfalls below 1V, the AP1701/3 RESET

output no longer sinks current—it becomes an open circuit.

Therefore, high-impedance CMOS logic inputs connected to

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 V_CCtransients

(glitches).

RESET can drift to undetermined voltages.

This presents no problem in most applications since most µP and

other circuitry is inoperative with V_CCbelow 1V. However, in

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

graph was generated using a negative going pulse applied to V_CC

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 V_CC

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 V_CCtransient that goes 100mV below the reset

threshold and lasts 100µs or less will not cause a reset pulse. A

0.1µF bypass capacitor mounted as close as possible to the V_CC

pin provides additional transient immunity.

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 are 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 V_CC< 1V.

Benefits of Highly Accurate Reset Threshold

Most µP supervisor ICs has reset threshold voltages

Ensuring a Valid Reset Output

Down to V_CC= 0

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 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.

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

Once V_CCexceeds 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 (V_CCdips

RESET

Block Diagram

Driver

Delay Circuit

RESET

/ RESET

REF

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3-PIN MICROPROCESSOR RESET CIRCUITS

Performance Characteristics

Threshold

2.928

2.926

2.924

2.922

2.92

-40

80 90

-30 -20 -10

10 20 30 40 50 60 70

-50 -40 -30 -20 -10

10 20 30 40 50 60 70 80 90 100 110 120

Temp ( C )

Iq vs. Temp

Temp

Threshold vs. Temp

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3-PIN MICROPROCESSOR RESET CIRCUITS

Timing Diagram

V_TH

V_CC

T_DELAY

Active Low

T_S

Active High

T_DELAY

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)

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3-PIN MICROPROCESSOR RESET CIRCUITS

Marking Information

(1) SC59-3L

(Top View)

: Identification code

: Year 0-9

: Month A~L

: Lead Free Package

: Green Package

XX Y M X

Device

Package (Note 3)

Identification Code

AP1701AW

AP1701BW

AP1701CW

AP1701DW

AP1701EW

AP1701FW

AP1701GW

AP1702AW

AP1702BW

AP1702CW

AP1702DW

AP1702EW

AP1702FW

AP1702GW

AP1703AW

AP1703BW

AP1703CW

AP1703DW

AP1703EW

AP1703FW

AP1703GW

AP1704AW

AP1704BW

AP1704CW

AP1704DW

AP1704EW

AP1704FW

AP1704GW

SC59

Notes: 3. For Packaging Details, go to our website at http://www.diodes.com/datasheets/ap02007.pdf.

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3-PIN MICROPROCESSOR RESET CIRCUITS

Package Information (All Dimensions in mm)

(1) Package Type: SC59-3L

0.35/0.50

2.70/

3.00

TOP VIEW

1.90

2.90/3.10

1.00/

1.30

0.10/0.20

0.013/0.10

0.95

0.35/0.55

0°/8°

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3-PIN MICROPROCESSOR RESET CIRCUITS

IMPORTANT NOTICE

Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further

notice to any product herein. Diodes Incorporated does not assume any liability arising out of the application or use of any product described herein; neither

does it convey any license under its patent rights, nor the rights of others. The user of products in such applications shall assume all risks of such use and will

agreeto hold DiodesIncorporatedand all the companieswhose productsare represented onour website, harmlessagainst all damages.

LIFE SUPPORT

Diodes Incorporated productsare notauthorizedfor use ascriticalcomponentsin lifesupportdevices or systemswithout theexpressed written approval ofthe

PresidentofDiodesIncorporated.

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AP1701DWG-7 [DIODES]

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