Overview
The TPS3808G33DBVRG4, produced by Texas Instruments, is a microprocessor supervisory circuit designed to monitor system voltages and provide a power-on reset (POR) function. This device is part of the TPS3808 family, which is known for its low quiescent current and high threshold accuracy. It is particularly useful in applications requiring precise voltage monitoring and reset capabilities.
Key Specifications
| Parameter | Value | Conditions |
|---|---|---|
| Supply Voltage Range | 1.7 V to 6.5 V | -40°C to 125°C |
| Quiescent Current (IDD) | 2.4 μA (typical) at VDD = 3.3 V | RESET not asserted, MR, RESET, CT open |
| Threshold Accuracy | ±0.5% (typical) | -40°C to 85°C |
| Reset Delay Time | 1.25 ms to 10 s (adjustable) | Dependent on CT pin configuration |
| Manual Reset (MR) Input | Logic low to assert reset | - |
| RESET Output | Open-drain | - |
| Operating Temperature Range | -40°C to 125°C | - |
| Package Options | SOT-23, 2-mm × 2-mm WSON | - |
Key Features
- Power-on Reset Generator: Adjustable delay time from 1.25 ms to 10 s.
- Low Quiescent Current: 2.4 μA typical, making it suitable for battery-powered devices.
- High Threshold Accuracy: ±0.5% typical, ensuring reliable voltage monitoring.
- Fixed and Adjustable Threshold Voltages: Factory-set thresholds from 0.9 V to 5 V and adjustable down to 0.4 V using an external resistor divider.
- Manual Reset (MR) Input: Allows for manual assertion of the reset signal.
- Open-Drain RESET Output: Compatible with various system configurations.
- Compact Packaging: Available in SOT-23 and 2-mm × 2-mm WSON packages.
Applications
- DSP or Microcontroller Applications: Ideal for monitoring and resetting microprocessors and digital signal processors.
- Notebook and Desktop Computers: Used in power management and system reset functions.
- PDAs and Hand-Held Products: Suitable for portable and battery-powered devices due to its low quiescent current.
- FPGA and ASIC Applications: Provides reliable reset and voltage monitoring for field-programmable gate arrays and application-specific integrated circuits.
- Portable and Battery-Powered Products: Enhances system reliability in various portable electronics.
Q & A
- What is the primary function of the TPS3808G33DBVRG4?
The primary function is to monitor system voltages and generate a power-on reset signal when the voltage drops below a preset threshold or when the manual reset input is triggered.
- 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 is the typical quiescent current of the TPS3808G33DBVRG4?
The typical quiescent current is 2.4 μA.
- What are the available package options for the TPS3808G33DBVRG4?
The device is available in SOT-23 and 2-mm × 2-mm WSON packages.
- How does the manual reset (MR) input work?
The manual reset input asserts the reset signal when it is driven to a logic low.
- What is the operating temperature range of the TPS3808G33DBVRG4?
The operating temperature range is -40°C to 125°C.
- Can the threshold voltage be adjusted?
- What types of applications is the TPS3808G33DBVRG4 suitable for?
- How does the RESET output work?
The RESET output is an open-drain output that remains high (unasserted) as long as the SENSE voltage is above its threshold and the manual reset input is logic high. It is asserted (driven low) when the SENSE voltage drops below the threshold or the manual reset input is driven low.
- What is the significance of the CT pin in the TPS3808G33DBVRG4?
The CT pin is used to set the reset delay time. Connecting it to VDD results in a 300-ms delay, while leaving it open results in a 20-ms delay.
