AS1902C23 [AMSCO]

Ultra Low-Power uP Supervisory Circuit; 超低功耗高达监控电路


型号：	AS1902C23
厂家：	AMS(艾迈斯)
描述：	Ultra Low-Power uP Supervisory Circuit 超低功耗高达监控电路光电二极管监控
文件：	总9页 (文件大小：76K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

austriamicrosystems

Data Sheet

AS1901, AS1902, AS1903

Ultra Low-Power µP Supervisory Circuit

1 General Description

The AS1901/2/3 family is an ultra low-power supervisory

circuit device.

2 Key Features

Low 230nA (typ) Supply Current

Precision Monitoring of 2.5-, 3-, and 3.3V-Power

Supplies

The device can be used to monitor the supply voltage of

digital systems and microprocessors and initiate a reset

when the voltage goes below a predefined threshold.

The duration of the reset is 5/20/100/500ms (typ.) after

the supply voltage has risen above the threshold.

Supply Voltage Range: 1.0 to 3.6V

Reset Threshold Range: 2.2 to 3.1V

Available in 3 Versions:

The AS1901/2/3 exhibit excellent reliability and can

reduce application costs by eliminating all external com-

ponents.

- AS1901 Push Pull RESETN

- AS1902 Push Pull RESET

- AS1903 Open Drain RESETN

The device is available with different output drivers:

The AS1901 has a push-pull driver with an active low

reset.

4 Time-Out Periods Ranging from 5 to 500ms

Detection Voltage Accuracy: 1.5%

Temperature Range: -40 to +85°C

Package: SOT23-3

The AS1902 uses the same output stage as the

AS1901, but has an active high reset.

The AS1903 has an open drain output with active low

reset.

All devices operate down to a voltage of 1V.

Pin Compatible to MAX6326/6327/6328

The reset thresholds are factory-trimmable between

2.2V and 3.08V in steps of approximately 100mV.

3 Applications

Each device of the AS1901/2/3 family is offered with four

time-out periods of 5/20/100/500ms.

Computers

The extremely low current consumption of only 230nA

(typ) at 3.3V makes the device ideal for use in portable

applications.

Intelligent Instruments

Controllers

All devices are available in a 3-pin SOT23 package.

Critical Microprocessor and Microcontroller

Power Monitoring

Portable/Battery-Powered Equipment

Automotive

Figure 1. Functional Block Diagrams

VCC

VDD

VCC

VDD

VCC

AS1901

AS1902

Microprocessor

AS1903

RESETN,

RESET

GND

RESETN

RESET I/O

GND

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Data Sheet

4 Absolute Maximum Ratings

Stresses beyond those listed in Table 1 may cause permanent damage to the device. These are stress ratings only,

and functional operation of the device at these or any other conditions beyond those indicated in Section 5 Electrical

Characteristics is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device

reliability.

(

Table 1. Absolute Maximum Ratings TA = 25°C Unless Otherwise Noted)

Parameter

VDD to GND

Limits

-0.3 to +5

-0.3 to VDD + 0.3

Unit

Notes

RESET/RESETN to GND

Input Current (VDD)

V/µs

°C

Output Current (RESET, RESETN)

Rate of Rise (VDD)

100

Operating Temperature Range (TA)

Storage Temperature Range

-40 to +85

-65 to +150

°C

The reflow peak soldering temperature (body

temperature) specified is in accordance with

IPC/JEDEC J-STD-020C “Moisture/Reflow

Sensitivity Classification for non-hermetic

Solid State Surface Mount Devices”

Package-Body Peak Temperature

+260

°C

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Data Sheet

5 Electrical Characteristics

VDD = Full Range; TA = -40 to +85ºC; Unless Otherwise Specified

Table 2. Electrical Characteristics

Parameter

VDD Range

Symbol

VDD

Conditions

TA = 0 to +70°C

Min

1.0

1.2

Typ

Max

3.6

Unit

TA = -40 to +85°C

VDD = 3.3V, No Load

3.6

Supply Current (AS1901/2/3)

IDD

230

VTH

430

VTH -

1.5%

VTH +

1.5%

TA = +25°C

VTH

Reset Threshold Voltage

VTH -

2.5%

VTH +

2.5%

TA = -40 to +85°C

VTH

tRD

tTP

VDD = VTH to (VTH - 100mV)

µs

VDD to Reset Delay

tTP -

40%

tTP +

60%

tTP

Reset Active Time-Out Period

RESETN Output Voltage (AS1901/3)

RESETN Output Voltage (AS1901)

ISINK = 1.2mA, VDD = 2.1V, Reset

Asserted

0.4

VOL

VOH

ISINK = 400µA, VDD = 1.2V, Reset

Asserted

0.8 x

VDD

ISOURCE = 1.2mA, VDD = 3.2V

ISOURCE = 500µA, VDD = 2.1V,

Reset Asserted

0.8 x

VDD

ISOURCE = 100µA, VDD = 1.2V,

Reset Asserted

0.8 x

VDD

RESET Output Voltage (AS1902)

RESET Threshold Hysteresis

ISINK = 1.2mA, VDD = 3.2V,

Reset Not Asserted

VOL

VHYST

ILEAK

0.4

0.1

µA

Open-Drain RESETN Output

Leakage Current (AS1903)

Notes:

See Table 5, “Coding of Factory-Trimmed Reset Threshold Voltages,” on page 5.

Guaranteed by design.

See Table 3, “Coding of Factory-trimmed Reset Active Time-Out Period,” on page 5.

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Interfacing to Microprocessors with Bi-Directional Reset Pins

Data Sheet

6 Operation

6.1 Interfacing to Microprocessors with Bi-Directional Reset Pins

The device has an open drain RESETN output, which enables easy interfacing to microprocessors (µP) with bi-direc-

tional reset pins, such as the Motorola 68HC11. The RESETN pin of the microcontroller (µC) can be connected directly

to the µP supervisor's RESETN output with a single pull-up resistor (see Figure 1 on page 1).

6.2 Operating Characteristics

Supply Current vs. Temperature,

VCC=3.3V

Pow er-Dow n Reset Delay

vs. Temperature, VOD = 10mV

0.5

200

0.4

0.3

150

100

0.2

0.1

-40

-20

-40

-20

Temperature (°C)

Maximum Transient Duration

vs. Reset Threshold Overdrive

Power-Up Reset Timeout

vs. Temperature

400

200

300

200

100

160

120

100

1000

-40

-20

Reset Threshold Overdrive

Vth-Vcc (mV)

Temperature (°C)

6.3 Negative-Going VDD Transients

The device is optimized to ignore short-duration, negative-going VDD transients (glitches) in order to avoid incorrect

resets.

In the graph Maximum Transient Duration vs. Reset Threshold Overdrive (page 4), the conditions are shown, for which

the reset pulses are not generated. In the graph the maximum pulse width that a negative VDD transient may have

when a reset signal is generated. As the amplitude of the transient increases, the maximum allowable pulse width

decreases.

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Data Sheet

7 Options

Table 3. Coding of Factory-trimmed Reset Active Time-Out Period

tTP in Milliseconds

Device

Suffix

Min

Typ

Max

AS190x_xx

100

500

160

800

300

Table 4. Output Variants

Device

Output Functionality

Active Low (RESETN)

Active High (RESET)

Open Drain (RESETN)

AS1901xxx

AS1902xxx

AS1903xxx

Table 5. Coding of Factory-Trimmed Reset Threshold Voltages

Reset Threshold Voltage, VTH in V

Device

Suffix

TA = +25°C

Typ

TA = -40 to +85°C

Min

Max

Min

Max

AS190xx__

2.167

2.285

2.364

2.463

2.591

2.660

2.758

2.886

2.955

3.034

2.2

2.233

2.355

2.436

2.538

2.669

2.741

2.842

2.974

3.045

3.126

2.145

2.262

2.340

2.438

2.564

2.633

2.730

2.857

2.925

3.003

2.255

2.378

2.460

2.563

2.696

2.768

2.870

3.003

3.075

3.157

2.32

2.4

2.5

2.63

2.7

2.8

2.93

3.0

3.08

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Pin Assignments

Data Sheet

8 Pinout and Packaging

8.1 Pin Assignments

Figure 2. Pin Assignments (Top View)

Top View

GND

AS1901

AS1902

AS1903

VDD

RESETN,

RESET

SOT23-3

8.2 Pin Descriptions

Table 6. Pin Descriptions

Pin Number

Pin Name

Description

Ground

AS1901/AS1903

AS1902

GND

Active-low reset output. RESETN remains low while VDD is

below the reset threshold and for tTP after VDD rises above

the reset threshold. RESETN is open-drain on the AS1903

and push-pull on the AS1901.

RESETN

Active-high reset output. RESET remains high while VDD is

below the reset threshold and for tTP after VDD rises above

the reset threshold.

RESET

VDD

Supply voltage.

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Package Drawings and Markings

Data Sheet

8.3 Package Drawings and Markings

The device is available in a 3-pin SOT-23 package.

Figure 3. 3-Pin SOT-23 Package.

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Data Sheet

9 Ordering Information

The device is available in the following standard versions.

Standard Part

AS1901C23

AS1901C26

AS1901C31

AS1902C23

AS1902C26

AS1902C31

AS1903C23

AS1903C26

AS1903C31

Threshold

Duration

100ms

Marking

ASBA

ASBD

ASBI

2.32

2.63

3.08

2.32

2.63

3.08

2.32

2.63

3.08

ASBK

ASBN

ASBS

ASBU

ASBX

ASB3

Non-standard versions require a minimum order of 30,000 units. Contact austriamicrosystems for availability of non-

standard versions.

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Data Sheet

Copyrights

lated, stored, or used without the prior written consent of the copyright owner.

All products and companies mentioned are trademarks or registered trademarks of their respective companies.

Disclaimer

Devices sold by austriamicrosystems AG are covered by the warranty and patent indemnification provisions appearing

in its Term of Sale. austriamicrosystems AG makes no warranty, express, statutory, implied, or by description regarding

the information set forth herein or regarding the freedom of the described devices from patent infringement. austriami-

crosystems AG reserves the right to change specifications and prices at any time and without notice. Therefore, prior

to designing this product into a system, it is necessary to check with austriamicrosystems AG for current information.

This product is intended for use in normal commercial applications. Applications requiring extended temperature

range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or life-

sustaining equipment are specifically not recommended without additional processing by austriamicrosystems AG for

each application.

The information furnished here by austriamicrosystems AG is believed to be correct and accurate. However,

austriamicrosystems AG shall not be liable to recipient or any third party for any damages, including but not limited to

personal injury, property damage, loss of profits, loss of use, interruption of business or indirect, special, incidental or

consequential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the tech-

nical data herein. No obligation or liability to recipient or any third party shall arise or flow out of

austriamicrosystems AG rendering of technical or other services.

Contact Information

Headquarters

austriamicrosystems AG

A-8141 Schloss Premstaetten, Austria

Tel: +43 (0) 3136 500 0

Fax: +43 (0) 3136 525 01

e-mail: info@austriamicrosystems.com

For Sales Offices, Distributors and Representatives, please visit:

http://www.austriamicrosystems.com

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