ASM161JCUS/T ALSC [Alliance Semiconductor Corporation], ASM161JCUS/T Datasheet

ASM161JCUS/T

Manufacturer Part Number

ASM161JCUS/T

Description

uP Supervisory Circuit

Manufacturer

ALSC [Alliance Semiconductor Corporation]

Datasheet

1.ASM161JCUST.pdf (9 pages)

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October 2003

rev 1.0

General Description

The ASM161 and ASM162 are cost effective, low power

supervisory

microprocessor, microcontroller and digital systems. If the

power supply drops below the reset threshold level, a reset is

asserted and remains asserted for atleast 800ms after V

risen above the reset threshold. An improved manual reset

architecture gives the system designer additional flexibility.

The debounced manual reset input is negative edge triggered.

The reset pulse period generated by a MR transition is a

minimum of 800 ms and a maximum of 2 sec duration. In

addition, The MR input signal is blocked for an additional 49µS

minimum after the reset pulse ends. During the MR disable

period, the microcontroller is guaranteed a time period free of

additional manual reset signals. During this period DRAM

contents can be refreshed or other critical system tasks

undertaken. Low power consumption makes the ASM161/162

ideal for use in portable and battery operated equipments. With

3V supplies power consumption is 8µW typically and 30µW

maximum. The ASM161 has an open-drain, active-LOW

RESET output and requires an external pull-up resistor. The

ASM162 has an active HIGH RESET output.

The ASM161/162 are offered in compact 4-pin SOT-143

packages. No external components are required to trim

threshold voltage for monitoring different supply voltages. With

six different factory set, reset, threshold ranges from 2.63V to

4.63V, the ASM161/162 are suitable for monitoring 5V, 3.6V

and 3.0V supplies. The ASM161/162 are available in

temperature ranges 0

Part Suffix

Reset Threshold

circuits

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

Voltage (V)

to 70

that

4.63

4.38

4.00

3.08

2.93

2.63

c and -40

monitor

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

c to +85

power

supplies

µP Supervisory Circuit

Alliance Semiconductor

has

Key Features

•

Applications

•

Typical Operating Circuit

Edge triggered manual reset input

single pulse output

49µS minimum MR disable period after reset

CMOS/TTL logic or switch interface

Debounced input

Low supply current extends battery life

Long reset period

Two reset polarity options

Pinout matches the AS811/812

Small 4-Pin SOT-143 package

Two temperature ranges: 0

PDAs

Appliances

Computers and embedded controllers

Wireless communication systems

Battery operated and intelligent instruments

Automotive systems

Safety systems

•

• 4.5µA / 10µA typ/max at 3.6V

• ASM161: Active LOW, open-drain

• ASM162: Active HIGH

• 0.8 sec minimum, 2 sec maximum

6µA / 15µA typ/max at 5.5V

(ASM162)

ASM161

GND

(RESET)

RESET

ASM161 / ASM162

to 70

20k for

ASM161

only

c and -40

(RESET)

RESET

c to +85

GND

µP

Related parts for ASM161JCUS/T

ASM161JCUS/T Summary of contents

Page 1

October 2003 rev 1.0 General Description The ASM161 and ASM162 are cost effective, low power supervisory circuits that monitor microprocessor, microcontroller and digital systems. If the power supply drops below the reset threshold level, a reset is asserted and remains ...

Page 2

October 2003 rev 1.0 Block Diagram - 4 Voltage V CC Divider + Bandgap Reference 3 MR Debounce MR * Non-retriggerable, edge 1 triggered manual reset GND Pin Configuration SOT-143 GND 1 ASM161 RESET 2 RESET is open drain Pin ...

Page 3

October 2003 rev 1.0 Detailed Descriptions The reset function ensures the microprocessor is properly reset and powers up into a known condition after a power failure. Reset Timing A reset is generated whenever the supply voltage is below the threshold ...

Page 4

October 2003 rev 1.0 Absolute Maximum Ratings Parameter Pin Terminal Voltage with respect to Ground V CC RESET, RESET and MR Input Current at V and MR CC Rate of Rise Power Dissipation (T = 70°C) A ...

Page 5

October 2003 rev 1.0 Electrical Characteristics Unless otherwise noted over the full range and 162 X E devices. Typical values Parameter Symbol Input Voltage ( ...

Page 6

October 2003 rev 1.0 Parameter Symbol Input Threshold Delay to MR Retrig- t MRD ger MR pull-up resistance Low RESET output volt age (ASM161) RESET Output Leak- I ...

Page 7

October 2003 rev 1.0 Package Dimensions Plastic SOT - 143 (4 pin) Notice: The information in this document is subject to change without notice Plastic SOT - 143 (4Pin ...

Page 8

... October 2003 rev 1.0 Ordering Information Reset 1 Threshold Part Number (V) ASM161LCUS/T 4.63 ASM161MCUS/T 4.38 ASM161JCUS/T 4.00 ASM161TCUS/T 3.08 ASM161SCUS/T 2.93 ASM161RCUS/T 2.63 ASM162LCUS/T 4.63 ASM162MCUS/T 4.38 ASM162JCUS/T 4.00 ASM162TCUS/T 3.08 ASM162SCUS/T 2.93 ASM162RCUS/T 2.63 ASM161LEUS/T 4.63 ASM161MEUS/T 4.38 ASM161JEUS/T 4.00 ASM161TEUS/T 3.08 ASM161SEUS/T 2.93 ASM161REUS/T 2.63 ASM162LEUS/T 4.63 ASM162MEUS/T 4.38 ASM162JEUS/T 4.00 ASM162TEUS/T 3.08 ASM162SEUS/T 2.93 ASM162REUS/T 2.63 Notes: 1. Tape and Reel packaging is indicated by the /T designation. ...

Page 9

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 ...

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