Overview
The TPS3808G01DBVTG4, produced by Texas Instruments, is a low-quiescent-current, programmable-delay microprocessor supervisory circuit. This device is designed to monitor system voltages and assert a RESET signal when the voltage drops below a preset threshold or when the manual reset (MR) pin is driven low. The TPS3808G01 is part of the TPS3808 family, which offers high threshold accuracy and adjustable delay times, making it suitable for a wide range of applications, particularly in battery-powered and low-power systems.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Quiescent Current | 2.4 | μA (typical) |
| Threshold Voltage Range | 0.405 V to 5 V | V |
| Threshold Accuracy | ±0.5% (VIT ≤ 3.3 V) | % |
| Reset Delay Time | 1.25 ms to 10 s (user-adjustable) | s |
| Manual Reset (MR) Input | Logic Low | |
| RESET Output | Open-drain | |
| Temperature Range | –40°C to 125°C | °C |
| Package Options | SOT-23, 2-mm × 2-mm WSON |
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
- High threshold accuracy: 0.5% typical for VIT ≤ 3.3 V
- Fixed threshold voltages for standard voltage rails from 0.9 V to 5 V and adjustable voltage down to 0.4 V
- Manual reset (MR) input and open-drain RESET output
- Small SOT-23 and 2-mm × 2-mm WSON packages
- User-adjustable reset delay time using an external capacitor
- Immunity to short negative transients on the SENSE pin
Applications
- DSP or microcontroller applications
- Notebook and desktop computers
- PDAs and hand-held products
- Portable and battery-powered products
- FPGA and ASIC applications
Q & A
- What is the typical quiescent current of the TPS3808G01?
The typical quiescent current is 2.4 μA.
- What is the range of threshold voltages available for the TPS3808G01?
The threshold voltage range is from 0.405 V to 5 V.
- 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, leaving it open, or using an external capacitor to set a delay between 1.25 ms and 10 s.
- What are the package options for the TPS3808G01?
The device is available in SOT-23 and 2-mm × 2-mm WSON packages.
- What is the temperature range for the TPS3808G01?
The device is fully specified over a temperature range of –40°C to 125°C.
- How does the manual reset (MR) input work?
The manual reset (MR) input asserts the RESET signal when driven low.
- What type of output does the RESET pin have?
The RESET output is open-drain.
- Why is the TPS3808G01 suitable for battery-powered applications?
It is suitable due to its very low quiescent current of 2.4 μA typical.
- How can the threshold voltage be adjusted for monitoring any voltage rail?
The threshold voltage can be adjusted using an external resistor divider for the TPS3808G01.
- What is the significance of the SENSE input pin?
The SENSE input pin monitors the system voltage and asserts the RESET signal if the voltage drops below the preset threshold.
