©

1999 IMP, Inc.

408-432-9100/www.impweb.com

1

Applications

N Computers and embedded controllers

N Battery-operated systems

N Intelligent instruments

N Wireless communication systems

N PDAs and handheld equipment

Block Diagrams

IMP705/6/7/8, 8

3L

RESET

RESET

V

CC

0.25mA

RESET

Generator

4.65V (IMP707)

4.40V (IMP708)

+

–

+

MR

IMP707

IMP708

PFO

GND

1.25V

–

+

PFI

705_02.eps

1.25V

–

+

MR

WDI

IMP705

IMP706

IMP813L

WDO

RESET

(RESET)

(IMP813L)

PFO

GND

V

CC

0.25mA

RESET

Generator

4.65V (IMP705/813L)

4.40V (IMP706)

+

–

+

PFI

Timebase

Watchdog

Timer

Transition

Detector

705_01.eps

Lo

cuits

– W

hdog timer

– Br

ection

– P

or

The IMP705/706/707/708 and IMP813L CMOS supervisor circuits

monitor power-supply and battery voltage level, and

µP/µC operation.

Compared to pin-compatible devices offered by Maxim Integrated

Products, IMP devices feature 60 percent lower maximum supply current.

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 (IMP705/707/813L) or 4.40V (IMP706/708). For 3V power supply

applications, refer to the IMP705P/R/S/T data sheet. In addition, the

IMP705/706/813L feature a 1.6 second watchdog timer. The IMP707/708

have both active-HIGH and active-LOW reset outputs but no watchdog

function. The IMP813L has the same pin-out and functions as the IMP705

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

1.25V threshold, useful in checking battery levels and 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.

Key Features

N Improved replacements for the Maxim

MAX705/6/7/8, MAX813L

– 140µA maximum supply current

– 60% improvement

N Precision power supply monitor

– 4.65V threshold (IMP705/707/813L)

– 4.40V threshold (IMP706/8)

N Debounced manual reset input

N Voltage monitor

– 1.25V threshold

– Battery monitor/Auxiliary supply monitor

N Watchdog timer (IMP705/706/813L)

N 200ms reset pulse width

N Active HIGH reset output (IMP707/708/813L)

N MicroSO package