Overview
The TPS3808G19DBVR, produced by Texas Instruments, is a microprocessor supervisory circuit 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. This device is part of the TPS3808 family, which offers adjustable delay times and high threshold accuracy, making it suitable for a wide range of applications, including battery-powered devices and high-reliability systems.
The TPS3808G19DBVR is available in small SOT-23 and 2-mm × 2-mm WSON packages, and it operates over a temperature range of –40°C to 125°C. It features a very low quiescent current of 2.4 μA, which is beneficial for power-sensitive designs.
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 | 5 | μA | |
| Low-Level Output Voltage (VOL) | 1.3 V ≤ VDD < 1.8 V, IOL = 0.4 mA | 0.3 | V | ||
| Low-Level Output Voltage (VOL) | 1.8 V ≤ VDD ≤ 6.5 V, IOL = 1 mA | 0.4 | V | ||
| RESET Delay Time (td) | CT = Open | 12 | 20 | 28 | ms |
| RESET Delay Time (td) | CT = VDD | 180 | 300 | 420 | ms |
| Propagation Delay (MR to RESET) | VIH = 0.7 VDD, VIL = 0.3 VDD | 150 | ns | ||
| Threshold Voltage (VIT) | For TPS3808G19 | 1.77 V | V |
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: Can be pulled up to a voltage higher than VDD (up to 6.5 V).
- Temperature Range: –40°C to 125°C.
- Package Options: SOT-23 and 2-mm × 2-mm WSON packages.
Applications
- DSP and Microcontroller Applications: Suitable 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: Ideal for battery-powered devices requiring low quiescent current.
- Portable and Battery-Powered Products: Enhances reliability in power-sensitive designs.
- FPGA and ASIC Applications: Used to monitor and reset field-programmable gate arrays and application-specific integrated circuits.
Q & A
- What is the typical quiescent current of the TPS3808G19DBVR?
The typical quiescent current is 2.4 μA.
- What is the range of adjustable delay times for the TPS3808G19DBVR?
The delay time can be adjusted from 1.25 ms to 10 s.
- What are the available package options for the TPS3808G19DBVR?
The device is available in SOT-23 and 2-mm × 2-mm WSON packages.
- What is the threshold voltage for the TPS3808G19DBVR?
The threshold voltage (VIT) for the TPS3808G19 is 1.77 V.
- How does the manual reset (MR) input function?
The MR input allows for manual assertion of the RESET signal by driving it low.
- What is the temperature range for the TPS3808G19DBVR?
The device operates over a temperature range of –40°C to 125°C.
- How is the RESET delay time set?
The RESET delay time can be set by connecting the CT pin to VDD, leaving it open, or using an external capacitor.
- What type of capacitor should be used for the CT pin?
A low-leakage type capacitor, such as a ceramic capacitor, should be used.
- How does the RESET output function?
The RESET output remains high (unasserted) as long as SENSE is above its threshold and MR is logic high. It is asserted low when either condition is not met.
- What are some typical applications for the TPS3808G19DBVR?
Typical applications include DSP and microcontroller systems, notebook and desktop computers, PDAs, hand-held products, and FPGA/ASIC applications.
