Overview
The TPS3839K33DBZT is an ultralow power, supply voltage supervisor circuit produced by Texas Instruments. This device is designed to monitor the input supply voltage and assert an active-low reset signal whenever the voltage drops below a specified threshold. The TPS3839 series is particularly useful in applications requiring high reliability and low power consumption, such as battery-powered devices, industrial control systems, and automotive electronics.
Key Specifications
| Parameter | Test Conditions | MIN | TYP | MAX | UNIT |
|---|---|---|---|---|---|
| VDD (Input supply voltage) | 0.9 | 6.5 | V | ||
| V(POR) (Minimum VDD voltage for valid output) | IOL = 1 µA | 0.6 | V | ||
| IDD (Supply current into VDD pin) | Output not connected | 150 | 500 | nA | |
| VOL (Low-level output voltage at RESET pin) | VDD = 1.2 V to 2.8 V, IOL = 0.5 mA | 0.4 | V | ||
| Operating ambient temperature (TA) | -40 | 85 | °C | ||
| Storage temperature (Tstg) | -65 | 150 | °C |
Key Features
- Ultralow Power Consumption: The TPS3839K33DBZT has a supply current as low as 150 nA, making it ideal for battery-powered applications.
- Voltage Transient Rejection: The device is designed to ignore fast transients on the VDD pin, ensuring reliable operation in noisy environments.
- Active-Low Reset Output: The RESET signal is asserted whenever the VDD supply voltage drops below the specified threshold and remains asserted for approximately 200 ms after the voltage rises above the threshold.
- Manual Reset Input (for TPS3831): Although the TPS3839 does not have this feature, the TPS3831 variant includes a manual reset input (MR) that can force the RESET signal low.
- Wide Operating Voltage Range: The device operates over a supply voltage range of 0.9 V to 6.5 V.
Applications
- Battery-Powered Devices: Ideal for devices that require low power consumption to extend battery life.
- Industrial Control Systems: Suitable for monitoring supply voltages in industrial control systems where reliability is critical.
- Automotive Electronics: Used in automotive systems to ensure robust operation under various environmental conditions.
- Medical Devices: Applicable in medical devices that require precise voltage monitoring and low power consumption.
Q & A
- What is the primary function of the TPS3839K33DBZT?
The primary function is to monitor the input supply voltage and assert an active-low reset signal when the voltage drops below a specified threshold.
- What is the typical supply current of the TPS3839K33DBZT?
The typical supply current is 150 nA.
- What is the operating temperature range of the TPS3839K33DBZT?
The operating temperature range is from -40°C to 85°C.
- How long does the RESET signal remain asserted after the voltage rises above the threshold?
The RESET signal remains asserted for approximately 200 ms after the voltage rises above the threshold.
- Does the TPS3839K33DBZT have a manual reset input?
No, the TPS3839K33DBZT does not have a manual reset input. This feature is available in the TPS3831 variant.
- What is the recommended bypass capacitor value for the VDD pin?
A small 0.1-µF bypass capacitor is recommended near the VDD pin to stabilize the supply voltage.
- What is the maximum storage temperature for the TPS3839K33DBZT?
The maximum storage temperature is 150°C.
- What is the voltage transient rejection feature of the TPS3839K33DBZT?
The device is designed to ignore fast transients on the VDD pin, ensuring reliable operation in noisy environments.
- What is the minimum VDD voltage for valid output?
The minimum VDD voltage for valid output (V(POR)) is 0.6 V.
- What is the low-level output voltage at the RESET pin?
The low-level output voltage (VOL) at the RESET pin is 0.4 V when VDD is between 1.2 V and 2.8 V and IOL is 0.5 mA.
