Datasheet ASM1233M Datasheet (Alliance Semiconductor)

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October 2003

rev 1.0

General Description

The ASM1233M is a voltage supervisor with low-power, 5V µP

Reset, with an active LOW, open-drain output. Maximum supply

current over temperature is a low 20µA.

The ASM1233M generates an active LOW reset signal

whenever the monitored supply is out of tolerance. A precision

reference and comparator circuit monitor power supply (V

level. Tolerance level options are 5% ,and 10% for a 5V power

supply. The tolerance is 15% for the 3.3V, ASM1233M. When

an out-of-tolerance condition is detected, an internal power-fail

signal is generated which forces an active LOW reset signal.

After V

remains active for 350ms to allow the power supply and system

microprocessor to stabilize.

The ASM1233M is designed with a open-drain output stage and

operates over the extended industrial temperature range.

Devices are available in compact surface mount SO-8

packages and 3-lead TO-92 packages.

returns to an in-tolerance condition, the reset signal

Low Power, 5V/3.0V, µP Reset, Active LOW, Open-Drain Output

Applications

• Set-top boxes

• Cellular phones

•PDAs

• Energy management systems

• Embedded control systems

• Printers

• Single board computers

)

Typical Operating Circuit

ASM1233M

RESET

ASM1233M

Microprocessor

RESET

Other low power products in this family include the ASM1810/

11/12/15/16/17 and ASM1233D.

Key Features

• Low Supply Current

•20 µA maximum (5.5 V)

•15µA maximum (3.6 V)

• Automatically restarts a microprocessor after power failure

• 350ms reset delay after V

dition

• Active LOW power-up reset, 5kΩ internal pull-up

• Precision temperature-compensated voltage reference and

comparator

• Eliminates external components

• Low-cost TO-92 package

• Compact surface mount SO-8 package

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

returns to an in-tolerance con-

Alliance Semiconductor

2575 Augustine Drive . Santa Clara, CA 95054 . Tel: 408.855.4900 . Fax: 408.855.4999 . www.alsc.com

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

GND

Block Diagram

ASM1233M

5.0kΩ

Supply

Tolerance

Bias

Delay

Reference

Delay

150ms

Typical

GND

RESET

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October 2003

rev 1.0

Pin Configuration

ASM1233M

RESET

GND

Pin Description

Pin #

SO-8 TO-92

1 1 RESET Active LOW reset output

SO-8

ASM1233M-X

Pin Name Description

Power supply input

TO-92*

ASM1233M-X

3, 5, 6, 7 and 8 - NC No Connection.

4 3 GND Ground.

* See Ordering Information

Low Power, 5V/3.0V, µP Reset, Active LOW, Open-Drain Output

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

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Application Information

Operation - Power Monitor

The ASM1233M detects out-of-tolerance power supply

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

down and generates a reset to the system processor when

the monitored power supply voltage is below the reset

threshold. When an out-of-tolerance V

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

active (LOW) for approximatley 350ms after the power supply

voltage has reached the selected tolerance. This allows the

power supply and microprocessor to stablize before RESET

is released.

(MIN)

CCTP

voltage is detected,

CCTP

(MAX)

CCTP

RPD

(MAX)

CCTP

RESET

Figure 2: Timing Diagram: Power-Down

ASM1233M

(MIN)

CCTP

RESET

Figure 1: Timing Diagram: Power-Up

RPU

Low Power, 5V/3.0V, µP Reset, Active LOW, Open-Drain Output

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

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Absolute Maximum Ratings

Parameter Min Max Unit

ASM1233M

Voltage on V

Voltage on RESET -0.5 VCC + 0.5 V

Operating Temperature Range -40 85 °C

Soldering Temperature (for 10 sec) 260 °C

Storage Temperature -55 125 °C

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.

-0.5 7 V

Low Power, 5V/3.0V, µP Reset, Active LOW, Open-Drain Output

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

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ASM1233M

rev 1.0

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.

Parameter Symbol Conditions Min Typ Max Unit

Supply Voltage

Output Voltage

Output Current

Operating Current

Trip Point (ASM1233M-5) V

VCC Trip Point (ASM1233M-55) V

VCC Trip Point (ASM1233M-3) V

Voltage High Trip Level ASM1233M-5 ASM1233M-55

Voltage Low Trip Level ASM1233M-5 ASM1233M-55

Voltage High Trip Level ASM1233M-3

CCTP

HTL

LTL

HTL

1.2 5.5 V

< 500 µA VCC - 0.5V VCC - 0.1V

OUT

Output = 0.4V, VCC >= 2.7V

VCC < 5.5V, RESET output open

VCC < =3.6V, RESET output

open

+8 mA

4.25 4.375 4.49 V

4.5 4.625 4.75 V

2.64 2.72 2.8 V

820µA

615µA

4.75

4.00 V

3.14 V

OUT

RPD

RPU

tr = 5µs

Internal Pull-up Resistor

Output Capacitance

Detect to RESET Low t

Slew Rate

- V

LTL

HTL

)

HTL

Slew Rate

LTL

VCC Detect to RESET High t

Note: A 1kΩ resistor maybe required in some applications for proper operation of the microprocessor reset control circuit.

3.5 5.0 7.5 kΩ

10 pF

210µs

300 µs

0ns

200 350 500 ms

Low Power, 5V/3.0V, µP Reset, Active LOW, Open-Drain Output

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

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Family Selection Guide

ASM1233M

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/3.0V, µP Reset, Active LOW, Open-Drain Output

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

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Package Information

ASM1233M

Plastic SO-8 (8-Pin)

Inches Millimeters

Min Max Min Max

Plastic SO-8 (8-Pin)

A 0.053 0.069 1.35 1.75

A1 0.004 0.010 0.10 0.25

B 0.013 0.020 0.33 0.51

C 0.007 0.010 0.19 0.25

e 0.050 1.27

E 0.150 0.157 3.80 4.00

H 0.228 0.244 5.80 6.20

L 0.016 0.050 0.40 1.27

D 0.189 0.197 4.80 2.00

0° - 8°

TO-92 (3-Pin)

Section

A-A

A 0.175 0.195 4.45 4.95

B 0.170 0.192 4.32 4.96

C 0.500 0.610 12.70 15.49

D 0.016 0.022 0.406 0.559

E 0.095 0.105 2.41 2.67

F 0.045 0.60 1.14 1.52

G 0.45 0.060 1.14 1.52

H 0.085 0.095 2.16 2.41

Bottom View

Inches Millimeters

Min Max Min Max

Plastic SO-8 (8-Pin)

TO-92* (3-Pin)

Section

A-A

I 0.130 0.155 3.30 3.94

J 0.014 0.020 0.35 0.51

K 0.093 0.115 2.36 2.92

L 45° 60° 45° 60°

M 0.118 Typical 3.00

Low Power, 5V/3.0V, µP Reset, Active LOW, Open-Drain Output

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

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Ordering Information

ASM1233M

Device Summary

RESET

Part Number

ASM1233M-55 4.625 5 350  LOW

ASM1233M-5 4.375 10 350  LOW

ASM1233M-3 2.720 15 350  LOW

ASM1233MS-55 4.625 5 350 LOW

ASM1233MS-5 4.375 10 350 LOW

ASM1233MS-3 2.720 15 350 LOW

* Add /S to Part Number for straight (unformed) leads. (i.e. ASM1233xx-x/S) ** Internal 5kΩ resistor pull-up

Output

Vol tage (V)

RESET

Tol era nce

(%)

RESET

Time (ms)

Open-Drain

Output

Stage**

TO-92

Package*

SO-8

Package

RESET

Polarity

Low Power, 5V/3.0V, µP Reset, Active LOW, Open-Drain Output

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

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ASM1233M

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

© Copyright 2003 Alliance Semiconductor Corporation. All rights reserved. Our three-point logo, our name and Intelliwatt are trademarks or registered trademarks of Alliance. All other brand and product names may be the trademarks of their respective companies. Alliance reserves the right to make changes to this document and its products at any time without notice. Alliance assumes no responsibility for any errors that may appear in this document. The data contained herein represents Alliance's best data and/or estimates at the time of issuance. Alliance reserves the right to change or correct this data at any time, without notice. If the product described herein is under development, significant changes to these specifications are possible. The information in this product data sheet is intended to be general descriptive information for potential customers and users, and is not intended to operate as, or provide, any guarantee or warrantee to any user or customer. Alliance does not assume any responsibility or liability arising out of the application or use of any product described herein, and disclaims any express or implied warranties related to the sale and/or use of Alliance products including liability or warranties related to fitness for a particular purpose, merchantability, or infringement of any intellectual property rights, except as express agreed to in Alliance's Terms and Conditions of Sale (which are available from Alliance). All sales of Alliance products are made exclusively according to Alliance's Terms and Conditions of Sale. The purchase of products from Alliance does not convey a license under any patent rights, copyrights; mask works rights, trademarks, or any other intellectual property rights of Alliance or third parties. Alliance does not authorize its products for use as critical components in life-supporting systems where a malfunction or failure may reasonably be expected to result in significant injury to the user, and the inclusion of Alliance products in such life-supporting systems implies that the manufacturer assumes all risk of such use and agrees to indemnify Alliance against all claims arising from such use.