Overview
The TPS3808G01 is a low-quiescent-current, programmable-delay microprocessor supervisory circuit from Texas Instruments. This device is designed to monitor system voltages and assert a RESET signal when the voltage drops below a specified threshold or when the manual reset (MR) pin is driven low. The TPS3808G01 is particularly suited for battery-powered applications due to its very low typical quiescent current of 2.4 μA.
The device is available in SOT-23 and 2-mm × 2-mm WSON packages and is fully specified over a temperature range of –40°C to 125°C. It offers adjustable delay times and threshold voltages, making it versatile for various applications.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Input Supply Range (VDD) | 1.7 | 6.5 | V | |
| Supply Current (IDD) at VDD = 3.3 V, RESET not asserted | 2.4 | 5.0 | μA | |
| Supply Current (IDD) at VDD = 6.5 V, RESET not asserted | 2.7 | 6.0 | μA | |
| Low-level Output Voltage (VOL) | 0.3 | 0.4 | V | |
| Power-up Reset Voltage (VPOR) | 0.8 | V | ||
| Threshold Voltage Accuracy (VIT) | -2% | ±1% | +2% | % |
| Hysteresis on VIT Pin (VHYS) | 1.5% | 3.0% | % | |
| MR Internal Pullup Resistance (R_MR) | 70 kΩ | 90 kΩ | kΩ | |
| Input Current at SENSE Pin (ISENSE) | -25 nA | 25 nA | nA |
Key Features
- Power-on reset generator with adjustable delay time: 1.25 ms to 10 s
- Very low quiescent current: 2.4 μA typical, making it suitable for battery-powered applications
- Adjustable threshold voltage using external resistor divider (TPS3808G01)
- Factory-set threshold voltages from 0.82 V to 3.3 V or from 4.4 V to 5 V
- User-selectable reset delay times: 20 ms, 300 ms, or user-defined using an external capacitor
- SENSE input with built-in hysteresis for smooth reset assertions and de-assertions
- Immunity to short negative transients on the SENSE pin
- Available in SOT-23 and 2-mm × 2-mm WSON packages
- Operating temperature range: –40°C to 125°C
Applications
- Battery-powered devices and systems
- Microprocessor and microcontroller systems requiring power-on reset and voltage monitoring
- Industrial control systems
- Medical devices
- Aerospace and defense systems
- Automotive electronics
Q & A
- What is the typical quiescent current of the TPS3808G01?
The typical quiescent current is 2.4 μA.
- How can the reset delay time be adjusted on the TPS3808G01?
The reset delay time can be adjusted by connecting the CT pin to VDD for a 300-ms delay, leaving the CT pin open for a 20-ms delay, or using an external capacitor for a user-defined delay between 1.25 ms and 10 s.
- What is the operating temperature range of the TPS3808G01?
The operating temperature range is –40°C to 125°C.
- How can the threshold voltage be adjusted on the TPS3808G01?
The threshold voltage can be adjusted using an external resistor divider for the TPS3808G01, or it can be factory-set for other versions.
- What is the purpose of the SENSE input on the TPS3808G01?
The SENSE input monitors any system voltage and asserts the RESET signal if the voltage drops below the specified threshold.
- What is the hysteresis on the VIT pin of the TPS3808G01?
The hysteresis on the VIT pin is 1.5% to 3.0%.
- What is the internal pullup resistance of the MR pin?
The internal pullup resistance of the MR pin is 70 kΩ to 90 kΩ.
- How does the TPS3808G01 handle short negative transients on the SENSE pin?
The device is relatively immune to short negative transients on the SENSE pin, with sensitivity dependent on threshold overdrive.
- What are the available package options for the TPS3808G01?
The device is available in SOT-23 and 2-mm × 2-mm WSON packages.
- What is the power-up reset voltage of the TPS3808G01?
The power-up reset voltage is 0.8 V.
