The TPS3808 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
The TPS3808 device uses a precision reference to achieve 0.5% threshold accuracy for
VIT ≤ 3.3 V. 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 TPS3808 device has a
very low typical quiescent current of 2.4 µA, so it is well-suited to battery-powered applications.
It is available in the SOT-23 and 2-mm × 2-mm WSON packages, and is fully specified over a
temperature range of 40°C to 125°C (TJ).
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