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).
| Number of supplies monitored | 1 |
| Threshold voltage 1 (typ) (V) | 0.405, 3.07 |
| Features | Manual reset capable, Reset time delay, Separate VDD & sense, Undervoltage monitor only |
| Reset threshold accuracy (%) | 0.5 |
| Iq (typ) (mA) | 0.0024 |
| Output driver type/reset output | Active-low, Open-drain |
| Time delay (ms) | 1.25, 20, 300, 1200 |
| Supply voltage (min) (V) | 1.7, 1.8 |
| Supply voltage (max) (V) | 6.5 |
| Rating | HiRel Enhanced Product |
| Watchdog timer WDI (s) | None |
| Operating temperature range (°C) | -55 to 125 |
| SOT-23 (DBV) | 6 | 8.12 mm² 2.9 x 2.8 |
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