Datasheet ASM1810 Datasheet (Alliance Semiconductor)

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February 2005

rev 1.4

Low Power, 5V µP Reset

- Active LOW, Push-Pull Output

General Description

The ASM1810 is a voltage supervisor with low-power, 5V µP

active LOW Reset, Push-Pull output. Maximum supply current

over temperature is a low 20µA.

The ASM1810 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.

) level.

CC

ASM1810

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-

CC

age

• Push-Pull output for minimum current drain

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

returns to an in-tolerance con-

CC

The ASM1810 is designed with a push-pull 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.

Other low power products in this family include the ASM1811/

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

Typical Operating Circuit

V

CC

ASM1810

Microprocessor

RESET

GND

RESET

Applications

• Set-top boxes

• Cellular phones

•PDAs

• Energy management systems

• Embedded control systems

• Printers

• Single board computers

Block Diagram

V

V

2

CC

CC

ASM1810

Supply

Supply

Tolerance

Tolerance

Bias

Bias

Reference

Reference

+

+

-

-

ASM1810

Delay

Delay

150ms

150ms

Typical

Typical

1

RESET

RESET

3

GND

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

1

ASM1810

TO-92

SOT-23

ASM1810

V

CC

Pin Description

SOT-23 TO-92

Pin # Pin #

11RESET

22

3 3 GND Ground

ASM1810-R

2

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

ASM1810

Operation - Power Monitor

The ASM1810 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

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

voltage is detected, the RESET signal is

CC

is released.

ASM1810

Microprocessor

RESET

RESET

100kΩ

t

R

V

(MIN)

V

CCTP

~

~

V

CC

~

RESET

Figure 2: Timing Diagram: Power-Up

~

CCTP

V

t

RPU

CCTP

(MAX)

V

OH

Figure 1: RESET Valid to 0V V

Output Conditions

The ASM1810 active LOW reset signal is valid as long as V

remains above 1.2V. However the RESET output on the

ASM1810 uses a push-pull drive stage that can maintain a valid

output below 1.2V. To sink current with V

resistor can be connected from the reset pin (RESET) to

Ground (see Figure 1). This configuration will give a valid value

on the RESET

power up and down, this configuration will draw current when

the RESET is in the high state. A value of 100kΩ should be

adequate to maintain a valid connection.

output with VCC approaching 0V. During both

CC

below 1.2V, a

CC

CC

t

V

CCTP

F

t

RPD

V

OL

V

CC

V

(MAX)

CCTP

RESET

Figure 3: Timing Diagram: Power-Down

V

CCTP

(MIN)

~

~

Low Power, 5V µP Reset

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

3 of 9

February 2005

rev 1.4

Absolute Maximum Ratings

ASM1810

Parameter Min Max Unit

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

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

Electrical Characteristics

Unless otherwise noted VCC = 1.25V to 5.5V and specifications are over the operating temperature range of -400c to +850c. All voltages are referenced to ground

Parameter Symbol Conditions Min Typ Max Unit

Supply voltage

Output voltage

Output Current

V

CC

V

OH

I

OH

I

< 500 µA VCC - 0.5V VCC - 0.1V

OUT

Output = 2.4V, VCC > 2.7V

1.2 5.5 V

350 µA

V

KV

V

V

Output Current

Operating Current

V

Trip Point (ASM1810R-5) V

CC

VCC Trip Point (ASM1810R-10) V

Trip Point (ASM1810R-15) V

V

CC

Output Capacitance

Detect to RESET Low t

V

CC

VCC Slew Rate

(V

(MAX) to V

CCTP

Slew Rate

V

CC

(V

(MIN) to V

CCTP

V

Detect to RESET High t

CC

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

CCTP

CCTP

(MIN)

(MAX)

I

OL

I

CC

CCTP

CCTP

CCTP

C

OUT

RPD

t

F

t

R

RPU

and should not be considered fo r proper operation or use.

RPD

Output = 0.4V, VCC > 2.7V

VCC < 5.5V, RESET output open

tr = 5µs

Low Power, 5V µP Reset

+10 mA

820µA

4.50 4.62 4.75 V

4.25 4.37 4.49 V

4.00 4.12 4.24 V

10 pF

25µs

300 µs

0ns

100 150 300 ms

4 of 9

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

February 2005

rev 1.4

Family Selection Guide

ASM1810

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

ASM1810

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

o

8

o

0

o

8

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

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

ASM1810

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

7 of 9

February 2005

rev 1.4

Ordering Information

ASM1810

Device Summary

RESET

Part ** Number

TIN - LEAD DEVICES

ASM1810R-5 4.62 5 150 LOW RALL

ASM1810R-10 4.37 10 150 LOW RBLL

ASM1810R-15 4.12 15 150 LOW RCLL

LEAD FREE DEVICES

ASM1810R-5F 4.62 5 150 LOW KALL

ASM1810R-10F 4.37 10 150 LOW KBLL

ASM1810R-15F 4.12 15 150 LOW KCLL

Part ** Number

TIN - LEAD DEVICES

ASM1810-5 4.62 5 150 LOW ASM1810-5

ASM1810-10 4.37 10 150 LOW ASM1810-10

Output

Voltage (V)

RESET
Output

Voltage (V)

RESET

Tolerance (%)

RESET

Tolerance (%)

RESET

Time (ms)

RESET

Time (ms)

Push-Pull

Output

Stage

Push-Pull

Output

Stage

SOT-23

Package

TO-92

Package

RESET

Polarity

RESET

Polarity

Package Marking

Package Marking

ASM1810-15 4.12 15 150 LOW ASM1810-15

LEAD FREE DEVICES

ASM1810-5F 4.62 5 150 LOW ASM1810-5F

ASM1810-10F 4.37 10 150 LOW ASM1810-10F

ASM1810-15F 4.12 15 150 LOW ASM1810-15F

** Add /T to Part Number for Tape and Reel (i.e ASM18xx-x/T)
LL - Lot Code

Low Power, 5V µP Reset

8 of 9

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

ASM1810

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: ASM1810
Document Version: 1.4