| Number of supplies monitored | 1 |
| Threshold voltage 1 (Typ) (V) | 2.33 |
| Features | Manual reset capable |
| Reset threshold accuracy (%) | 2 |
| Output driver type/reset output | Active-low, Open-drain |
| Time delay (ms) | Programmable |
| Rating | Catalog |
| Watchdog timer WDI (sec) | None |
| Operating temperature range (C) | -40 to 125 |
- Power-On Reset Generator with Adjustable Delay Time: 1.25ms to 10s
- Very Low Quiescent Current: 2.4μA typ
- High Threshold Accuracy: 0.5% typ
- Fixed Threshold Voltages for Standard Voltage Rails from 0.9V to 5V and Adjustable Voltage Down to 0.4V Are Available
- Manual Reset (MR) Input
- Open-Drain RESET Output
- Temperature Range: -40°C to +125°C
- Small SOT23 and 2mm × 2mm QFN Packages
- APPLICATIONS
- DSP or Microcontroller Applications
- Notebook/Desktop Computers
- PDAs/Hand-Held Products
- Portable/Battery-Powered Products
- FPGA/ASIC Applications
PowerPAD Is a trademark of Texas Instruments
All other trademarks are the property of their respective owners
The TPS3818xxx family of microprocessor supervisory circuitsmonitor system voltages from 0.4V to 5.0V, 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 TPS3818 uses a precision reference to achieve 0.5% threshold accuracy for VIT ≤ 3.3V. The reset delay time can be set to 20ms by disconnecting the CT pin, 300ms by connecting the CT pin to VDD using a resistor, or can be user-adjusted between 1.25ms and 10s by connecting the CT pin to an external capacitor. When used with an external capacitor, the TPS3818xxx gives a more accurate delay time than the similar TPS3808xxx device. The TPS3818 has a very low typical quiescent current of 2.4μA so it is well-suited to battery-powered applications. It is available in either a small SOT23 and an ultra-small 2mm × 2mm QFN PowerPAD package, and is fully specified over a temperature range of -40°C to +125°C (TJ).
