Overview
The TPS3808G18DBVR from Texas Instruments is a low-quiescent-current, programmable-delay microprocessor supervisory circuit. 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 TPS3808G18DBVR is part of the TPS3808 family, which offers high threshold accuracy and adjustable reset delay times, making it suitable for a wide range of applications, including DSP, microcontroller, FPGA, and ASIC systems.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Nominal Supply Voltage | 1.8 V | V |
| Threshold Voltage (VIT) | 1.67 V | V |
| Quiescent Current | 2.4 μA (typical) | A |
| Reset Delay Time | 1.25 ms to 10 s (user-adjustable) | s |
| Threshold Accuracy | 0.5% (typical for VIT ≤ 3.3 V) | % |
| Temperature Range | –40°C to 125°C | °C |
| Package Options | SOT-23 (6-pin), WSON (6-pin) | - |
| Manual Reset (MR) Input | Logic low to assert reset | - |
| RESET Output | Open-drain | - |
Key Features
- Power-on reset generator with adjustable delay time from 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 vision and automotive radar systems
Q & A
- What is the primary function of the TPS3808G18DBVR?
The primary function is 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.
- What are the available reset delay times for the TPS3808G18DBVR?
The reset delay time can be set to 20 ms by disconnecting the CT pin, 300 ms by connecting the CT pin to VDD using a resistor, or can be user-adjusted from 1.25 ms to 10 s by connecting the CT pin to an external capacitor.
- What is the quiescent current of the TPS3808G18DBVR?
The typical quiescent current is 2.4 μA.
- What is the temperature range of the TPS3808G18DBVR?
The device is fully specified over a temperature range of –40°C to 125°C.
- What package options are available for the TPS3808G18DBVR?
The device is available in SOT-23 (6-pin) and WSON (6-pin) packages.
- How does the manual reset (MR) input work?
The manual reset (MR) input asserts the reset when driven to a logic low.
- What type of output does the RESET pin have?
The RESET output is open-drain.
- What is the threshold accuracy of the TPS3808G18DBVR for VIT ≤ 3.3 V?
The threshold accuracy is 0.5% typical for VIT ≤ 3.3 V.
- Can the TPS3808G18DBVR be used in battery-powered applications?
Yes, it is well-suited for battery-powered applications due to its very low quiescent current.
- How can the reset delay time be adjusted?
The reset delay time can be adjusted by connecting the CT pin to VDD with a resistor, leaving the CT pin open, or connecting the CT pin to an external capacitor.
