Overview
The TPS3808G25DRVRG4 is a microprocessor supervisory circuit produced by Texas Instruments. This device is 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. The TPS3808 family is known for its low quiescent current, high threshold accuracy, and adjustable delay times, making it suitable for a wide range of applications, including battery-powered devices and automotive systems.
Key Specifications
| Parameter | Test Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| VDD (Input supply range) | –40°C < TJ < 125°C | 1.7 | 6.5 | V | |
| IDD (Supply current) | VDD = 3.3 V, RESET not asserted, MR, RESET, CT open | 2.4 | 2.4 | 5 | μA |
| VOL (Low-level output voltage) | 1.3 V ≤ VDD < 1.8 V, IOL = 0.4 mA | 0.3 | V | ||
| VOL (Low-level output voltage) | 1.8 V ≤ VDD ≤ 6.5 V, IOL = 1 mA | 0.4 | V | ||
| Temperature range | –40°C | 125°C | °C | ||
| Threshold voltage (VIT) | For TPS3808G25 | 2.33 V | V |
Key Features
- Power-on reset generator with adjustable delay time: 1.25 ms to 10 s
- Very low quiescent current: 2.4 μA typical
- High threshold accuracy: 0.5% typical for VIT ≤ 3.3 V
- Fixed threshold voltages for standard voltage rails from 0.9 V to 5 V and adjustable voltage down to 0.4 V
- Manual reset (MR) input
- Open-drain RESET output
- Temperature range: –40°C to 125°C
- Small SOT-23 and 2-mm × 2-mm WSON packages
Applications
- DSP or microcontroller applications
- Notebook and desktop computers
- PDAs and hand-held products
- Portable and battery-powered products
- FPGA and ASIC applications
- Automotive applications (qualified for automotive use)
Q & A
- What is the typical quiescent current of the TPS3808G25DRVRG4?
The typical quiescent current is 2.4 μA
- What is the range of the adjustable delay time for the power-on reset generator?
The adjustable delay time ranges from 1.25 ms to 10 s
- What are the available package types for the TPS3808G25DRVRG4?
The device is available in SOT-23 and 2-mm × 2-mm WSON packages
- What is the temperature range for the TPS3808G25DRVRG4?
The operating temperature range is –40°C to 125°C
- How is the reset threshold voltage set for the TPS3808G25DRVRG4?
The reset threshold voltage for the TPS3808G25 is factory-set at 2.33 V, but other versions can be set to various voltages from 0.405 V to 5 V using external resistors or factory programming
- What is the purpose of the manual reset (MR) input?
The manual reset (MR) input allows for a manual reset of the system by driving the MR pin low
- How does the open-drain RESET output work?
The open-drain RESET output remains low when the SENSE voltage drops below the threshold or when the MR pin is driven low. A pull-up resistor is required to hold the line high when RESET is not asserted
- What types of applications are the TPS3808 devices suited for?
The devices are suited for DSP or microcontroller applications, notebook and desktop computers, PDAs, hand-held products, portable and battery-powered products, FPGA and ASIC applications, and automotive systems
- How can the reset delay time be adjusted?
The reset delay time can be set to 20 ms by disconnecting the CT pin, 300 ms by connecting the CT pin to VDD, or can be user-adjusted between 1.25 ms and 10 s by connecting the CT pin to an external capacitor
- What is the significance of the SENSE input?
The SENSE input provides a terminal to monitor any system voltage. If the voltage on this pin drops below the preset threshold (VIT), the RESET signal is asserted
