Overview
The TPS3808G15DBVTG4 is a microprocessor supervisory circuit from Texas Instruments, designed to monitor system voltages and provide a power-on reset (POR) signal. This device is part of the TPS3808 family, which offers adjustable delay times and high threshold accuracy. It is particularly suited for applications requiring low quiescent current, making it ideal for battery-powered devices.
The TPS3808G15DBVTG4 can monitor system voltages from 0.4 V to 5 V and asserts an open-drain RESET signal when the SENSE voltage drops below a preset threshold or when the manual reset (MR) pin is driven low. The device features a precision reference for high threshold accuracy and a user-adjustable reset delay time.
Key Specifications
| Parameter | Test Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| VDD Input Supply Range | –40°C < TJ < 125°C | 1.7 | 6.5 | V | |
| Supply Current (IDD) | VDD = 3.3 V, RESET not asserted, MR, RESET, CT open | 2.4 | 2.4 | 5 | μA |
| Low-Level Output Voltage (VOL) | 1.3 V ≤ VDD < 1.8 V, IOL = 0.4 mA | 0.3 | V | ||
| Threshold Accuracy (VIT) | VIT ≤ 3.3 V | –1.5% | ±0.5% | 1.5% | % |
| Hysteresis on VIT Pin (VHYS) | Fixed versions | 1% | 2.5% | % | |
| MR Internal Pullup Resistance (R_MR) | 70 | 90 | 90 | kΩ | |
| Input Current at SENSE Pin (ISENSE) | VSENSE = VIT | –25 | 25 | nA | |
| Temperature Range (TJ) | –40 | 125 | °C |
Key Features
- Power-on Reset Generator: Adjustable delay time from 1.25 ms to 10 s.
- Low Quiescent Current: Typical 2.4 μA, making it suitable for battery-powered applications.
- High Threshold Accuracy: ±0.5% typical for VIT ≤ 3.3 V.
- Fixed and Adjustable Threshold Voltages: Available for standard voltage rails from 0.9 V to 5 V and adjustable down to 0.4 V.
- Manual Reset (MR) Input: Allows for manual assertion of the RESET signal.
- Open-Drain RESET Output: Compatible with various logic levels.
- Compact Packages: Available in SOT-23 and 2-mm × 2-mm WSON packages.
- Wide Temperature Range: Fully specified over –40°C to 125°C.
Applications
- DSP and Microcontroller Applications: Ideal for monitoring and resetting digital signal processors and microcontrollers.
- Notebook and Desktop Computers: Used in power management and reset circuits.
- PDAs and Hand-Held Products: Suitable for battery-powered devices requiring low quiescent current.
- Portable and Battery-Powered Products: Enhances reliability in portable electronics.
- FPGA and ASIC Applications: Provides robust reset functionality for field-programmable gate arrays and application-specific integrated circuits.
Q & A
- What is the typical quiescent current of the TPS3808G15DBVTG4?
The typical quiescent current is 2.4 μA.
- What is the range of the adjustable delay time for the RESET signal?
The adjustable delay time ranges from 1.25 ms to 10 s.
- What are the available package types for the TPS3808G15DBVTG4?
The device is available in SOT-23 and 2-mm × 2-mm WSON packages.
- What is the temperature range for the TPS3808G15DBVTG4?
The device is fully specified over a temperature range of –40°C to 125°C.
- How can the reset delay time be adjusted?
The reset delay time can be adjusted by connecting the CT pin to VDD, leaving it open, or using an external capacitor.
- What is the purpose of the manual reset (MR) input?
The MR input allows for manual assertion of the RESET signal.
- What is the threshold accuracy for VIT ≤ 3.3 V?
The threshold accuracy is ±0.5% typical for VIT ≤ 3.3 V.
- How does the device 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 types of applications is the TPS3808G15DBVTG4 suitable for?
It is suitable for DSP, microcontroller, notebook, desktop, PDA, hand-held, portable, and battery-powered applications, as well as FPGA and ASIC applications.
- How is the RESET output configured?
The RESET output is an open-drain configuration.
