Overview
The TPS3825-33DBVT, produced by Texas Instruments, is part of the TPS382x family of voltage supervisors. These devices are designed to provide circuit initialization and timing supervision, primarily for DSP and processor-based systems. During power-on, the RESET output asserts when the supply voltage (VDD) becomes greater than 1.1 V and remains active low as long as VDD is less than the threshold voltage (VIT−). The device includes an internal timer that delays the return of the output to the inactive state to ensure proper system reset.
The TPS3825-33DBVT is particularly suited for systems that require precise power-up and power-down sequencing, offering features such as a power-on reset generator, manual reset input, and a watchdog timer.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage Range | 2.5 V, 3 V, 3.3 V, 5 V | V |
| Reset Delay Time | 200 ms | ms |
| Watchdog Timer Options | 200 ms, 1.6 s | ms, s |
| Supply Current (Typical) | 15 μA | μA |
| Operating Temperature Range | −40°C to 85°C (−40°C to 125°C for TPS3823A-33) | °C |
| Package Type | 5-pin SOT-23 | |
| Reset Output Type | Active-low, Active-high, Open-drain | |
| Manual Reset Input | Available |
Key Features
- Power-on Reset Generator: With a fixed delay time of 200 ms (or 25 ms for TPS3820).
- Manual Reset Input: Available for manual system reset.
- Reset Output Options: Active-low, active-high, and open-drain outputs.
- Supply Voltage Supervision: Monitors supply voltage and keeps RESET active low if VDD is below the threshold voltage.
- Watchdog Timer: Offers watchdog time-out options of 200 ms and 1.6 s.
- Low Power Consumption: Typical supply current of 15 μA.
- Compact Package: 5-pin SOT-23 package.
- Broad Temperature Range: Operates from −40°C to 85°C (−40°C to 125°C for TPS3823A-33).
Applications
- DSPs, Microcontrollers, and Microprocessors: For circuit initialization and timing supervision.
- Industrial Equipment: For reliable power-on and power-down sequencing.
- Programmable Controls: Ensures proper system reset and watchdog functionality.
- Automotive Systems: For robust voltage supervision and reset generation.
- Portable and Battery-Powered Equipment: Due to its low power consumption.
- Intelligent Instruments and Wireless Communications Systems: For precise power management.
- Notebook and Desktop Computers: For reliable system initialization and supervision.
Q & A
- What is the primary function of the TPS3825-33DBVT?
The primary function is to provide circuit initialization and timing supervision, particularly for DSP and processor-based systems.
- What are the available reset delay times for the TPS382x family?
The reset delay times are 200 ms (TPS3823, TPS3824, TPS3825, and TPS3828) and 25 ms (TPS3820).
- What types of reset outputs are available for the TPS3825-33DBVT?
The device offers active-low, active-high, and open-drain reset outputs.
- What is the typical supply current of the TPS3825-33DBVT?
The typical supply current is 15 μA.
- What is the operating temperature range of the TPS3825-33DBVT?
The operating temperature range is −40°C to 85°C (−40°C to 125°C for TPS3823A-33).
- What package type is the TPS3825-33DBVT available in?
The device is available in a 5-pin SOT-23 package.
- Does the TPS3825-33DBVT have a manual reset input?
- What are some common applications for the TPS3825-33DBVT?
- How does the watchdog timer function in the TPS3825-33DBVT?
The watchdog timer issues a reset signal if the WDI input is not periodically triggered within the specified time-out interval.
- Is the TPS3825-33DBVT still in production?
No, the TPS3825-33DBVT is no longer in production. New designs should consider an alternate product.
