The TPS3808xxx family of microprocessor supervisory circuits
monitors system voltages from 0.4 V to 5.0 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 TPS3808 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 has a very low
typical quiescent current of 2.4 µA, so it is well-suited to battery-powered applications. It is
available in a small SOT-23 package, and is fully specified over a temperature range of 55°C to
+125°C (TJ).
The TPS3808xxx family of microprocessor supervisory circuits
monitors system voltages from 0.4 V to 5.0 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 TPS3808 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 has a very low
typical quiescent current of 2.4 µA, so it is well-suited to battery-powered applications. It is
available in a small SOT-23 package, and is fully specified over a temperature range of 55°C to
+125°C (TJ).