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June 2008 Rev C

SP705 Low Power Microprocessor Supervisory Circuits

© 2008 Exar Corporation

SP705-708/813L

Low Power Microprocessor Supervisory Circuits

s Precision Voltage Monitor:

SP705/707/813L at 4.65V

SP706/708 at 4.40V

s RESET Pulse Width - 200ms

s Independent Watchdog Timer - 1.6s

Timeout (SP705/706/813L)

s 60

µA Maximum Supply Current

s Debounced TTL/CMOS Manual Reset Input

s RESET Asserted Down to V

s Voltage Monitor for Power Failure or Low

Battery Warning

s Available in 8-pin PDIP, NSOIC, and

µSOIC packages

s Pin Compatible Enhancement to Industry Standard 705-708/813L Series

s Functionally Compatible to Industry Standard 1232 Series

DESCRIPTION…

The SP705-708/813L series is a family of microprocessor (

µP) supervisory circuits that

integrate myriad components involved in discrete solutions which monitor power-supply and

battery in

µP and digital systems. The SP705-708/813L series will significantly improve

system reliability and operational efficiency when compared to solutions obtained with discrete

components. The features of the SP705-708/813L series include a watchdog timer,

a

µP reset, a Power Fail Comparator, and a manual-reset input. The SP705-708/813L

series is ideal for applications in automotive systems, computers, controllers, and intelligent

instruments. The SP705-708/813L series is an ideal solution for systems in which critical

monitoring of the power supply to the

µP and related digital components is demanded.

Part

RESET

RESET

Manual

PFI

Number

Threshold

Active

RESET

Watchdog

Accuracy

SP705

4.65 V

LOW

YES

YES

4%

SP706

4.40 V

LOW

YES

YES

4%

SP707

4.65 V

LOW and HIGH

YES

NO

4%

SP708

4.40 V

LOW and HIGH

YES

NO

4%

SP813L

4.65 V

HIGH

YES

YES

4%

Now available in Lead Free