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).