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Analog Microelectronics, Inc.

1

AME8500 / 8501

Micropower 

µµµµµ

P Reset Family

n

n

n

n

n

 

Features

l

Small packages: SOT-23, SOT-89

l

11 voltage threshold options

l

Tight voltage threshold tolerance ---

±

1.50%

l

4 reset interval options

l

4 output configuration options

l

Wide temperature range -------- -40

o

C to 85

o

C

l

Low temperature coefficient --- 100ppm/

o

C (max)

l

Low quiescent current < 3.0

µ

A

l

Thermal shutdown option (AME8501)

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n

n

n

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General Description

The AME8500 family allows the user to customize the

CPU reset function without any external components.

The user has a large choice of reset voltage thresh-

olds,  reset time intervals, and  output driver configura-

tions, all of which are preset at  the factory.   Each

wafer is trimmed to the customer's specifications.

These circuits monitor the power supply voltage of 

µ

P

based systems.  When the power supply voltage drops

below the voltage threshold  a reset is asserted immedi-

ately (within an interval T

D1

).  The reset remains asserted

after the supply voltage rises above the voltage threshold

for a time interval, T

D2 

.  The reset output may be either

active high (RESET) or active low (RESETB).  The reset

output may be configured as either push/pull or open

drain.  The state of the reset output is guaranteed to be

correct for supply voltages greater than 1V.

The AME8501 includes all the above functionality plus

an overtemperature shutdown function.  When the  ambi-

ent temperature exceeds 80

0

C  a reset is asserted and

remains asserted until the temperature falls  below 60

0

C.

Space saving SOT23 packages and micropower quies-

cent current (<3.0

µ

A) make this family a natural for por-

table battery powered equipment.

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n

n

n

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Applications

l

Portable electronics

l

Power supplies

l

Computer peripherals

l

Data acquisition systems

l

Applications using CPUs

l

Consumer electronics

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Analog Microelectronics, Inc.

2

AME8500 / 8501

Micropower 

µµµµµ

P Reset Family

n

n

n

n

n

 

Pin Configuration

AME8500AEET

AME8501AEET

1: GND

2: Reset/ResetB

3: V

DD

3

1

2

AME8500BEET

AME8501BEET

1: Reset/ResetB

2: GND

3: V

DD

3

1

2

AME8500AEFT

AME8501AEFT

1: GND

2: V

DD

3: Reset/ResetB

3

2

1

AME8500BEFT

AME8501BEFT

1: Reset/ResetB

2: V

DD

3: GND

3

2

1

3

1

2

AME8500CEET

AME8501CEET

1: Reset/ResetB

2: V

DD

3: GND

3

2

1

1: V

DD

2: GND

3: Reset/ResetB

AME8500CEFT

AME8501CEFT

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Analog Microelectronics, Inc.

3

AME8500 / 8501

Micropower 

µµµµµ

P Reset Family

Note: AME8500 without over-temperature thermal shutdown function.

AME8501 with over-temperature thermal shutdown function.

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Ordering Information

AME8500xEET X X XX

( SOT-23)

AME8501xEET X X XX

( SOT-23)

AME8500xEFT X X XX

( SOT-89)

AME8501xEFT X X XX

( SOT-89)

VDD Threshold Voltage (V

TH

)

21: V

TH

=2.1V

24: V

TH

=2.4V

26: V

TH

=2.63V

27: V

TH

=2.7V

28:   V

TH

=2.8V

29: V

TH

=2.93V

31: V

TH

=3.08V

40: V

TH

=4.0V

42: V

TH

=4.20V

44: V

TH

=4.38V

46: V

TH

=4.63V

note: Please contact AME sales dept. for other voltage options.

Reset Time (TD

2NOM

)

A:

T

D

=1.5mS

D:

T

D

=30mS

E:

T

D

=150mS

F:

T

D

=210mS

Output Driver Option

--For example--

*

AME8500AEETAF27  means:

A:

PP

Output is RESETB, push pull 

B:

OD

* Output Driver Chart Explanation:

Reset time is 210mS

C:

PP

PP = Push pull output

V

DD

 threshold voltage is 2.7V

D:

OD

OD = Open drain output

No temperature shutdow n

Polarity

RESET = Active high

RESETB

RESET 

RESET

characteristic of            

RESET or RESETB pin 

Polarity

RESETB

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Analog Microelectronics, Inc.

4

AME8500 / 8501

Micropower 

µµµµµ

P Reset Family

n

n

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n

n

 

Absolute Maximum Ratings

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Recommended Operating Conditions

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Thermal Information

Caution: Stress above the listed absolute rating may cause permanent damage to the device

Ambient Temperature Range

Junction Temperature

Supply Voltage

Parameter

-40  to +85 

o

C

-40 to +125 

o

C

   Storage Temperature

-65 to 150 

O

C

Rating

1.6 - 5 V

Maximum

Unit

7

V

B

20

mA

20

mA

100

V/

µ

s

Parameter

Supply Voltage

ESD Classification

   Rate of Rise, V

DD

   Output Current, RESET, ResetB

   Input Current, V

DD

Maximum

Unit

325

180

350

650

150

o

C

300

o

C

Parameter

Maximum Lead Temperature ( 10 Sec)

Maximum Junction Temperature

o

C

 

/

 

W

mW

   Thermal Resistance (SOT-89)

   Power Dissipation (SOT-23)

   Power Dissipation (SOT-89)

Thermal Resistance (SOT-23)

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Analog Microelectronics, Inc.

5

AME8500 / 8501

Micropower 

µµµµµ

P Reset Family

Electrical Specifications

T

A

 

=

 

25

o

C unless otherwise noted

PARAMETER

SYMBOL

MIN TYP

MAX

UNITS

1

5.5

1

5.5

3.0

µ

A

5.0

V

THNOM

 

-

 

1.5%

V

THNOM

 

+

 

1.5%

V

THNOM

 

-

 

2.0%

V

THNOM

 

+

 

2.0%

Hysteresis Range

V

HYST

20

mV

RESET Threshold Tempco

30

ppm

RESETB Output Voltage Low     

V

DD

<Vth min

RESET Output Voltage Low      

V

DD

>Vth max

RESETB Output Voltage High

V

DD

>Vth max

RESET Output Voltage High

V

DD

<Vth min

V

DD

 to Reset Delay

T

D1

40

200

µ

S

Version A

0.5

1.5

5

mS

Version D

15

30

50

mS

Version E

80

150

230

mS

Version F

140

210

500

mS

Temperature Shutdown

T

OFF

80

o

Temperature Shutdown Hysteresis

T

HYS

20

o

Note1: The data based on V

TH

=2.7V part type.

0.8V

DD

V

0.5

V

mV

V

TH

V

RANGE

V

I

DD

V

DD

= V

TH

 - 100mV, TA= -40 ~ 85

O

C

V

DD

 Range*

Supply Current

Reset Threshold

V

OL

V

OH

I

SINK

=1.2mA,  

TA= -40~85

O

C

I

SOURCE

=0.5mA,  

TA= -40~85

O

C

V

Release

 - V

TH

, note1

TEST CONDITIONS 

TA=-40~85

O

C

V

DD

 

=

 

3.0V

V

DD

 

=

 

3.0V, TA=-40~85

O

C

TA=-40~85

O

C

Reset Timeout Period*

T

D2

TA= -40 ~ 85

O

C

AME8501 only

AME8501 only

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Analog Microelectronics, Inc.

6

AME8500 / 8501

Micropower 

µµµµµ

P Reset Family

n

n

n

n

 AME8500/01 pin description

V

DD

GND

Positive power supply.  A reset is asserted 

after this voltage drops below a 

predetermined level.  After V

DD

 rises above 

that level the reset output remains asserted 

until the end of the reset timeout period.

Ground

Description

Name

RESETB/

RESET

This pin can be ordered as RESET or 

RESETB.   RESET is active high. RESETB 

is active low.   It is also available with an 

open drain or pushpull output.

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Analog Microelectronics, Inc.

7

AME8500 / 8501

Micropower 

µµµµµ

P Reset Family

n

n

n

n

n

 

Timing Diagram

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n

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n

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Applications information

These devices have a certain immunity to fast

negative going transients.  In the following pages

the graph titled “Glitch Rejection” indicates the

maximum allowable glitch amplitude and dura-

tion to avoid triggering an unintended reset.  As

shown in the graph shorter transients can have

larger amplitudes without triggering resets.

Supply Transients

0

20

40

60

80

100

120

140

0.01

0.1

1

Glitch Rejection

Glitch Duration (

µµµµ

S)

Glitch Amplitude (V)

V

D D

T

D 2

V

T H

RESETB

V

T H

T

D 1

T

D 2

T

D 1

RESET

5 0 %

5 0 %

5 0 %

5 0 %

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Analog Microelectronics, Inc.

8

AME8500 / 8501

Micropower 

µµµµµ

P Reset Family

0

0.4

0.8

1.2

1.6

2

0

1

2

3

4

5

I

D D

 vs. V

D D

I

DD

 (

µµµµ

A)

V

D D

 (V)

8 5

O

C

-40

O

C

0

O

C

37

38

39

40

41

42

43

-40

-20

0

20

40

60

80

100

TD1 Delay vs. Temperature

TD2 Delay (

µµµµ

S)

Temperature (

O

C)

0

0.1

0.2

0.3

0.4

0.5

-40

-20

0

20

40

60

80

100

Threshold Hysteresis vs.

Temperature

Hysteresis (% of V

TH

)

Temperature (

O

C)

190

195

200

205

210

215

220

-45

-5

25

55

85

115

Te m pe ra ture   (

0

C)

Reset Time (mS)

Reset Time vs. Temperature

A M E 8 5 0 0 A E E T A F 2 6

2.630

2.632

2.634

2.636

2.638

2.640

2.642

2.644

2.646

2.648

2.650

-45

-5

25

55

85

115

Temperature (

0

C)

Reset Vth (V)

Reset Vth vs. Temperature

A M E 8 5 0 0 A E E T A F 2 6

2.10

2.15

2.20

2.25

2.30

2.35

-45

-5

25

55

85

115

Temperature (

0

C)

Supply Current @ 5V (uA)

I

D D

 vs. Temperatrue

A M E 8 5 0 0 A E E T A F 2 6

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Analog Microelectronics, Inc.

9

AME8500 / 8501

Micropower 

µµµµµ

P Reset Family

0.220

0.225

0.230

0.235

0.240

0.245

0.250

0.255

0.260

0.265

-45

-5

25

55

85

115

Temperature (

0

C)

Reset VOL @ 0.8mA (V)

Reset VOL vs. Temperature

A M E 8 5 0 0 A E E T A F 2 6

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Analog Microelectronics, Inc.

10

AME8500 / 8501

Micropower 

µµµµµ

P Reset Family

n

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Package Dimension

SOT-23

SOT-89

MIN

MAX

MIN

MAX

A

1.40

1.60

0.0551

0.0630

A

1

0.89

-

0.0350

-

b

0.36

0.52

0.0142

0.0205

b

1

0.41

0.56

0.0161

0.0220

C

0.35

0.44

0.0138

0.0173

D

4.40

4.60

0.1732

0.1811

D

1

1.35

1.83

0.0531

0.0720

HE

-

4.25

-

0.1673

E

2.29

2.60

0.0902

0.1024

e

2.90

3.10

0.1142

0.1220

H

0.35

0.70

0.0138

0.0276

S1

1.40

1.60

0.0551

0.0630

SYMBOLS

MILLIMETERS

INCHES

MIN

MAX

MIN

MAX

A

1.00

1.40

0.0394

0.0551

A

1

0.00

0.15

0.0000

0.0059

A

2

0.70

1.25

0.0276

0.0492

b

0.35

0.50

0.0138

0.0197

C

0.09

0.25

0.0035

0.0098

D

2.70

3.10

0.1063

0.1220

E

1.40

1.80

0.0551

0.0709

e

H

2.60

3.00

0.1024

0.1181

L

0.35

0.55

0.0138

0.0197

θ1

θ1

θ1

θ1

0

o

9

o

0

o

9

o

1.90 BSC

0.0748 BSC

SYMBOLS

MILLIMETERS

INCHES

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Life Support Policy:

These products of Analog Microelectronics, Inc. are not authorized for use as critical components in life-

support devices or systems, without the express written approval of  the president

of  Analog Microelectronics, Inc.

Analog Microelectronics, Inc. reserves the right to make changes in the circuitry and specifications of its

devices and advises its customers to obtain the latest version of relevant information.

©

 

Analog Microelectronics, Inc. , December 2001

Document: 2007-DS8500/8501-F

Corporate Headquarters

Asia Pacific Headquarters

Analog Microelectronics, Inc.

AME, Inc.

3100 De La Cruz Blvd. Suite 201

2F, No. 187 Kang-Chien Road, Nei-Hu District

Santa Clara, CA. 95054-2046

Taipei 114, Taiwan, R.O.C.

Tel : (408) 988-2388

Tel : 886 2 2627-8687

Fax: (408) 988-2489

Fax : 886 2 2659-2989

www.analogmicro.com

E-Mail: info@analogmicro.com