1 Features

? Power-on reset generator with adjustable delay

time: 1.25 ms to 10 s

? Very low quiescent current: 0.6 μA typical

? High threshold accuracy: 1 typical

? Fixed threshold voltages for standard voltage rails

from 0.9 V to 5 V and adjustable voltage down to

0.405 V are available

? Manual reset ( MR) input

? Open-drain RESET output

? Temperature range: –40°C to 125°C

? Small SOT-23-6

2 Applications

? Rack server motherboard

? Electricity meter

? DC-input BLDC motor drive

? AC drive power stage module

? Surgical equipment

? Single board computer

3 Description

The TPS3808E family of microprocessor supervisory

circuits monitors system voltages from 0.4 V to

5 V, asserting an open-drain RESET signal when

the SENSE voltage drops below a preset threshold

or when the manual reset (MR) pin drops to a

logic low. The RESET output remains low for the

user-adjustable delay time after the SENSE voltage

and manual reset (MR) return above the respective

thresholds.

The TPS3808E device uses a precision reference to

achieve 0.5 threshold accuracy. The reset delay

time can be set to 20 ms by disconnecting the CT

pin, 300 ms by connecting the CT pin to VDD using

a resistor, or can be user-adjusted between 1.25 ms

and 10 s by connecting the CT pin to an external

capacitor. The TPS3808E device has a very low

typical quiescent current of 0.6 μA, and is designed

for battery-powered applications. The TPS3808E is

available in the SOT-23-6 , and is fully specified over

a temperature range of –40°C to 125°C (TJ).