1 Features

1• Pin-to-pin compatible with LP3470

• 5-Pin SOT-23 package

• Open-drain RESET output

• Programmable reset time-out period using an

external capacitor

• Immune to short VCC transients

• ±1% Reset threshold accuracy (typical)

• Ultra-low quiescent current (0.3 μA typical)

• RESET valid down to VCC = 0.95 V

2 Applications

• Critical μP and μC power monitoring

• Intelligent instruments

• Computers

• Portable and battery-powered equipment

• Building automation: building security system,

video surveillance

• Factory automation: field transmitters, position

and proximity sensors

• Motor drives

3 Description

The LP3470A device is a micropower voltage

supervisory circuit designed to monitor voltages

within 1% of reset threshold overtemperature and is

pin-to-pin compatible with existing TI device LP3470.

The LP3470A device provides accurate, nano-power

voltage monitoring with programmable delay.

The LP3470A asserts a reset signal whenever the

VCC supply voltage falls below a reset threshold. The

reset time-out period is adjustable using an external

capacitor. Reset remains asserted for an interval

(programmed by an external capacitor) after VCC has

risen above the threshold voltage plus hysteresis.

For information on available reset threshold voltage

options, see Mechanical, Packaging, and Orderable

Information.