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SP810

3 Pin Microprocessor Supervisor Circuit

Exar Corporation 

February 2011

SP809 / SP810

3 Pin Microprocessor Supervisor Circuit

Rev. 2.0.0

GENERAL DESCRIPTION

The SP809/SP810 are low power

microprocessor (μP) supervisory circuits used

to monitor power supplies in μP and digital

systems.

They provide applications with benefits of

circuit reliability and low cost by eliminating

external components. If the VCC supply

voltage falls below preset threshold then a

reset signal is asserted for at least 140ms

after VCC has risen above the reset threshold.

Both the SP809 and SP810 were designed with

a reset comparator to help identify invalid

signals, which last less than 140ms. The only

difference between them is that they have an

active-low RESET output and active-high

RESET output, respectively. Low supply

current (1μA) makes SP809/SP810 ideal for

portable equipment.

The devices are available in 3 pin SOT-23

package.

APPLICATIONS

• Portable Electronic Devices

• Electrical Power Meters

• Digital Still Cameras

• µP Power Monitoring

FEATURES

• Ultra Low Supply Current 1µA (typ)

• Guaranteed Reset valid to VCC = 0.9V

• 140ms Power-On Reset Pulse Width

• Internally Fixed Threshold

2.3V, 2.6V, 2.9V, 3.1V, 4.4V, 4.6V

• 1.5% Voltage Threshold Tolerance

• 3 Pin SOT-23 Package

Part Number

SP809N

SP809

SP810

Output Type

Open Drain Active Low

Push-Pull Low

Push-Pull Active High

TYPICAL APPLICATION DIAGRAM

Fig. 1: SP809 / SP810 Application Diagram

Exar Corporation

48720 Kato Road, Fremont CA 94538, USA

www.exar.com

Tel. +1 510 668-7000 – Fax. +1 510 668-7001

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