Datasheet ASM1811 Datasheet (Alliance Semiconductor)

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February 2005

rev 1.4

General Description

The ASM1811 is a voltage supervisory device with a low-power,

5V µP Reset, active LOW, open-drain output. Maximum supply

current over temperature is a low 20µA.

The ASM1811 generates an active LOW reset signal whenever

the monitored supply is out of tolerance. A precision reference

and comparator circuit monitor power supply (V

Tolerance level options are 5%, 10% and 15%. When an out-of-

tolerance condition is detected, an internal power-fail signal is

generated which forces an active LOW reset signal. After V

returns to an in-tolerance condition, the reset signal remains

active for 150ms to allow the power supply and system

microprocessor to stabilize.

The ASM1811 is designed with a open-drain output stage and

operates over the extended industrial temperature range.

Devices are available in low cost TO-92 and compact surface

mount SOT-23 packages.

Low Power 5V µP Reset Active LOW, Open - Drain Output

) level.

CC

Applications

• Set-top boxes

• Cellular phones

•PDAs

• Energy management systems

• Embedded control systems

• Printers

• Single board computers

Typical Operating Circuit

CC

V

ASM1811

CC

RESET

ASM1811

Microprocessor

RESET

Other low power products in this family include the ASM1810/

12/15/16/17, ASM1233D and ASM1233M.

Key Features

• Low Supply Current

•20 µA maximum (5.5 V)

• Automatically restarts a microprocessor after power failure

• 150ms reset delay after V

dition

• Active LOW power-up reset

• Precision temperature-compensated voltage reference and

comparator

• Eliminates external components

• Low cost TO-92 and compact surface mount SOT-23 pack-

ages

• Operating temperature -40°C to +85°C

returns to an in-tolerance con-

CC

Block Diagram

V

V

2

CC

CC

Supply

Supply

Tolerance

Tolerance

Bias

Bias

+

+

-

-

Reference

Reference

GND

ASM1811

Delay

Delay

150ms

150ms

Typical

Typical

GND

5.5KΩ

1

RESET

3

Alliance Semiconductor

2575 Augustine Drive . Santa Clara, CA 95054 . Tel: [phone] . Fax: [phone] . www.alsc.com

Notice: The information in this document is subject to change without notice

February 2005

rev 1.4

Pin Configuration

RESET

ASM1811

TO-92

SOT-23

ASM1811

1

Pin Description

SOT-23 TO-92

Pin # Pin #

1 1 RESET

22

3 3 GND Ground

ASM1811-R

V

2

CC

GND

3

2

1

Pin Name Description

Active LOW reset output

V

CC

Power supply input

3

Low Power 5V µP Reset

Notice: The information in this document is subject to change without notice

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February 2005

rev 1.4

Application Information

Operation - Power Monitor

The ASM1811 detects out-of-tolerance power supply

conditions. It resets a processor during power-up, power-

down and issues a reset to the system processor when the

monitored power supply voltage is below the reset threshold.

When an out-of-tolerance V

RESET signal is asserted. On power-up, RESET is kept

active (LOW) for approximately 150ms after the power supply

voltage has reached the selected tolerance. This allows the

power supply and microprocessor to stabilize before RESET

is released.

voltage is detected, the

CC

V

CC

RESET

V

CCTP

(MAX)

V

CCTP

ASM1811

t

F

V

(MIN)

CCTP

~

t

RPD

~

t

R

V

V

(MIN)

V

CCTP

~

~

V

CC

~

RESET

Figure 1: Timing Diagram: Power-Up

~

CCTP

t

RPU

CCTP

(MAX)

V

OL

Figure 2: Timing Diagram: Power-Down

V

OH

Low Power 5V µP Reset

Notice: The information in this document is subject to change without notice

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February 2005

rev 1.4

Absolute Maximum Ratings

Parameter Min Max Unit

ASM1811

Voltage on V

Voltage on RESET

Operating Temperature Range -40 85 °C

Soldering Temperature (for 10 sec) 260 °C

Storage Temperature -55 125 °C

CC

-0.5 7 V

V

-0.5

CC

+ 0.5

V

ESD rating

HBM

MM

NOTE: These are stress ratings only and functional use is not implied. Exposure to absolute maximum ratings for prolonged
periods of time may affect device reliability.

2

200

KV

V

Electrical Characteristics

Unless otherwise noted, VCC = 1.2V to 5.5V and specifications are over the operating temperature range of -40°C to +85°C. All voltages are

referenced to ground

Supply Voltage

Parameter Symbol Conditions Min Typ Max Unit

V

CC

1.2 5.5 V

Operating Current

Trip Point (ASM1811R-5) V

V

CC

Trip Point (ASM1811R-10) V

V

CC

Trip Point (ASM1811R-15) V

V

CC

Internal Pull-up Resistor

Output Capacitance

RESET Active Time

VCC Detect to RESET Low t

VCC Slew Rate

(MAX) to V

(V

CCTP

V

Slew Rate

CC

(V

(MIN) to V

CCTP

Detect to RESET High t

V

CC

Note: The tF value is for reference in defining values for t

CCTP

CCTP

(MIN)

(MAX)

I

CC

CCTP

CCTP

CCTP

R

C

OUT

t

RESET

RPD

t

t

RPU

VCC < 5.5V, RESET output open

P

F

R

tr = 5µs

Low Power 5V µP Reset

820µA

4.50 4.62 4.75 V

4.25 4.35 4.49 V

4.00 4.13 4.24 V

3.5 5.5 7.5 kΩ

100 150 250 ms

25µs

300 µs

0ns

100 150 300 ms

and should not be considered for proper operation or use.

RPD

10 pF

4 of 9

Notice: The information in this document is subject to change without notice

February 2005

rev 1.4

Family Selection Guide

ASM1811

Part # RESET Voltage (V)

ASM1810 4.620, 4.370, 4.120 150 Push-Pull LOW

ASM1811 4.620, 4.350, 4.130 150 Open-Drain LOW

ASM1812 4.620, 4.350, 4.130 150 Push-Pull HIGH

ASM1815 3.060, 2.880, 2.550 150 Push-Pull LOW

ASM1816 3.060, 2.880, 2.550 150 Open-Drain LOW

ASM1817 3.060, 2.880, 2.550 150 Push-Pull HIGH

ASM1233D 4.625, 4.375, 4.125 350 Open-Drain LOW

ASM1233M 4.625, 4.375, 2.720 350 Open-Drain LOW

RESET Time

(ms)

Output Stage RESET Polarity

Low Power 5V µP Reset

Notice: The information in this document is subject to change without notice

5 of 9

February 2005

rev 1.4

Package Dimension

Plastic SOT-23 (3-Pin)

D

B

ASM1811

E

H

S

A

A1

Inches Millimeters

Min Max Min Max

Plastic SOT-23 (3-Pin)

A 0.030 0.046 0.75 1.17

A1 0.002 0.006 0.05 0.15

B 0.012 0.020 0.30 0.50

e

e1

a

C

L

C 0.003 0.008 0.08 0.20

D 0.110 0.120 2.80 3.04

E 0.047 0.055 1.20 1.40

e 0.037 BSC 0.95 BSC

e1 0.075 BSC 1.9 BSC

H 0.083 0.104 2.10 2.64

L 0.016 0.024 0.40 0.60

a

SNA NA

o

0

o

8

o

0

o

8

Low Power 5V µP Reset

Notice: The information in this document is subject to change without notice

6 of 9

February 2005

rev 1.4

ASM1811

To-92 (3-Pin)

Dimensions in Inches Dimensions in Millimeters

Min Max Min Max

TO-92

A 0.175 0.185 4.445 4.699

b 0.016 0.020 0.406 0.508

C 0.014 0.016 0.356 0.406

φD 0.175 0.185 4.445 4.699

E 0.138 0.144 3.505 3.658

e 0.098 0.102 2.489 2.591

e1 0.045 0.055 1.143 1.397

j 0.168 0.174 4.269 4.420

L 0.500 0.585 12.7 14.86

s 0.095 0.099 2.413 2.515

Low Power 5V µP Reset

Notice: The information in this document is subject to change without notice

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February 2005

rev 1.4

Ordering Information

ASM1811

Device Summary

RESET

Part *** Number

TIN - LEAD DEVICES

ASM1811R-5 4.62 5 150 LOW RDLL

ASM1811R-10 4.35 10 150 LOW RELL

ASM1811R-15 4.13 15 150 LOW RFLL

LEAD FREE DEVICES

ASM1811R-5F 4.62 5 150 LOW KDLL

ASM1811R-10F 4.35 10 150 LOW KELL

ASM1811R-15F 4.13 15 150 LOW KFLL

Part *** Number

TIN - LEAD DEVICES

ASM1811-5 4.62 5 150 LOW ASM1811-5

Output

Volta ge

(V)

RESET
Output

Volta ge

(V)

RESET

Tolerance

(%)

RESET

Tolerance

(%)

RESET

Time

(ms)

RESET

Time

(ms)

Open-Drain **

Output Stage

Open-Drain **

Output Stage

SOT-23

Package

TO-92

Package

RESET

Polarity

RESET

Polarity

Package
Marking

Package
Marking

ASM1811-10 4.35 10 150 LOW ASM1811-10

ASM1811-15 4.13 15 150 LOW ASM1811-15

LEAD FREE DEVICES

ASM1811-5F 4.62 5 150 LOW ASM1811-5F

ASM1811-10F 4.35 10 150 LOW ASM1811-10F

ASM1811-15F 4.13 15 150 LOW ASM1811-15F

** Internal 5.5kΩ resistor pull-up
** *Add /T to Part Number for Tape and Reel (i.e ASM18xx-x/T)
LL- Lot Code

Low Power 5V µP Reset

Notice: The information in this document is subject to change without notice

8 of 9

ASM1811

Alliance Semiconductor Corporation
2575, Augustine Drive,
Santa Clara, CA 95054
Tel: 408 - 855 - 4900
Fax: 408 - 855 - 4999
www.alsc.com

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Part Number: ASM1811
Document Version: 1.4