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UM706xS/UM708xS

Supply Voltage Supervisor w/Watchdog Input and Manual Reset

UM706xS SOP8

UM708xS SOP8

General Description

The UM706xS/UM708xS series are cost effective system power supply supervisory circuits

designed to monitor the power supplies in digital systems.

The UM706xS provides power-supply monitoring circuitry that generates a reset output during

as low as 1V. Independent watchdog monitoring circuitry is also provided. This is activated if the

watchdog input has not been toggled within 1.6 seconds. In addition, there is a 1.25V threshold

detector for power-fail warning, low battery detection, or to monitor an additional power supply.

An active low debounced manual reset input is also included.

The UM708xS is the same as the UM706xS, except an active-high reset is substituted for the

watchdog timer. All parts are available in a small outline SOP8 package.

Applications

Features



Applications using DSPs, Microcontrollers

or Microprocessors



Programmable Controls



Computers



Embedded System



Industrial Equipments



Intelligent Instrument



Wireless Communications Systems



Wide Operation Voltage Range of 1V to 5.5V



Correct

Logic

Output

Guaranteed

to



Precision Supply-Voltage Monitor: 2.63V,

2.93V, 3.08V,4.38V,4.63V



200ms Reset Pulse Width



Independent Watchdog Timer-1.6s Timeout

(UM706xS)



Active-high Reset Output (UM708xS)



Voltage

Monitor

for

Power-Fail

or

Low-Battery Warning



Temperature Range: -40°C to +85°C



Supply Current of 80μA (Typ.)

Pin Configurations

Top View

1

2

3

4

5

6

7

8

MR

GND

PFI

PFO

WDI(NC)*

RESET

WDO(RESET)*

UM706xS

( )* for UM708xS

1

2

3

4

5

6

7

8

UM706(708)*

XS

XX

XX: Week Code

( )* for UM708xS