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SP810

3 Pin Microprocessor Supervisor Circuit

Signal Processing Technologies 

SP809 / SP810

3 Pin Microprocessor Supervisor Circuit

FEATURES

■ Ultra Low Supply Current 1µA (typ.)

■ Guaranteed Reset valid to VCC = 0.9V

■ 140 ms Min. Power-On Reset Pulse Width

■ Internally Fixed Threshold 2.3V, 2.6V, 2.9V,

3.1V, 4.0V, 4.4V, 4.6V

■ Tight Voltage Threshold Tolerance: 1.5%

■ Offered in a 3 Pin SOT-23 Package

VCC

SP809

3 Pin SOT-23

GND

RESET

Now Available in Lead Free Packaging

Part Number

SP809N

SP809

SP810

Output Type

Open-Drain Active Low

Push-Pull Active Low

Push-Pull Active High

APPLICATIONS

■ Portable Electronic Devices

■ Electrical Power Meter

■ Digital Still Camera

■ µP Power Monitoring

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.

TYPICAL APPLICATION CIRCUIT

VCC

VCC

RESET

(RESET)

VCC

µP

RESET

GND

GND

Push-Pull output

Date: 5/02/06 Rev B

SP809/810, 3 Pin Microprocessor Supervisor Circuit

1

© Copyright 2006 Sipex Corporation

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