ASM705/706/707/708

April 2008

ASM813L

rev 1.6

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

PulseCore Semiconductor Corporation

1715 S. Bascom Ave Suite 200 Campbell, CA 95008

• Tel: 408-879-9077 • Fax: 408-879-9018

www.pulsecoresemi.com

Low Power µP Supervisor Circuits

General Description

The ASM705 / 706 / 707 / 708 and ASM813L are cost

effective CMOS supervisor circuits that monitors power-

supply and battery voltage level, and µP/µC operation.

The family offers several functional options. Each device

generates a reset signal during power-up, power-down and

during brownout conditions. A reset is generated when

the supply drops below 4.65V (ASM705/707/813L) or

4.40V (ASM706/708). For 3V power supply applications,

refer to the ASM705P/R/S/T data sheet. In addition, the

ASM705/706/813L feature a 1.6 second watchdog timer.

The ASM707/708 have both active-HIGH and active-LOW

reset outputs but no watchdog function. The ASM813L

has the same pin-out and functions as the ASM705 but has

an active-HIGH reset output. A versatile power-fail circuit

has a 1.25V threshold, useful in low battery detection and

for monitoring non-5V supplies. All devices have a manual

reset (MR) input. The watchdog timer output will trigger

a reset if connected to MR.

All devices are available in 8-pin DIP, SO and MicroSO

packages.

Features

•

Precision power supply monitor

• 4.65V threshold (ASM705/707/813L)

• 4.40V threshold (ASM706/708)

•

Debounced manual reset input

•

Voltage monitor

• 1.25V threshold

• Battery monitor / Auxiliary supply monitor

•

Watchdog timer (ASM705/706/813L)

•

200ms reset pulse width

•

Active HIGH reset output (ASM707/708/813L)

•

MicroSO package

Application

•

Computers and embedded controllers

•

Portable/Battery-operated systems

•

Intelligent instruments

•

Wireless communication systems

•

PDAs and hend-held equipment

•

Automative Systems

•

Safety Systems

Typical Operating Circuit