Overview
The TPS3808G25DRVR, produced by Texas Instruments, is a microprocessor supervisory circuit designed to monitor system voltages and assert a reset signal when necessary. This device is part of the TPS3808 family, which offers a range of features making it suitable for various applications, including DSP, microcontroller, notebook, desktop, and portable battery-powered devices. The TPS3808G25DRVR monitors system voltages from 0.4 V to 5 V and asserts an open-drain RESET signal when the SENSE voltage drops below a preset threshold or when the manual reset (MR) pin is driven low. The RESET output remains low for a user-adjustable delay time after both the manual reset (MR) and SENSE voltages return above their respective thresholds.
Key Specifications
| Parameter | Min | Typical | Max | Unit |
|---|---|---|---|---|
| VDD Input Supply Range | 1.8 | - | 6.5 | V |
| Supply Current (IDD) | - | 2.4 | 6 | μA |
| Low-Level Output Voltage (VOL) | - | 0.4 | - | V |
| Threshold Accuracy (VIT ≤ 3.3 V) | - | 0.5% | - | % |
| Operating Temperature Range | -40 | - | 125 | °C |
| Reset Delay Time | 1.25 ms | - | 10 s | - |
| Package Type | - | - | SOT-23, 2-mm × 2-mm WSON | - |
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
Q & A
- What is the primary function of the TPS3808G25DRVR?
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 is the range of the input supply voltage for the TPS3808G25DRVR?
The input supply voltage range is from 1.8 V to 6.5 V.
- 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 using a resistor, or user-adjusted between 1.25 ms and 10 s by connecting the CT pin to an external capacitor.
- What is the typical quiescent current of the TPS3808G25DRVR?
The typical quiescent current is 2.4 μA.
- What are the available package types for the TPS3808G25DRVR?
The device is available in SOT-23 and 2-mm × 2-mm WSON packages.
- What is the operating temperature range of the TPS3808G25DRVR?
The operating temperature range is from –40°C to 125°C.
- Can the threshold voltage be adjusted?
Yes, the threshold voltage can be factory-set from 0.82 V to 3.3 V or from 4.4 V to 5 V, and the TPS3808G01 can be set to any voltage above 0.405 V using an external resistor divider.
- What type of output does the TPS3808G25DRVR have?
The device has an open-drain RESET output.
- Is the TPS3808G25DRVR suitable for battery-powered applications?
Yes, due to its very low typical quiescent current of 2.4 μA, it is well-suited for battery-powered applications.
- What is the threshold accuracy for VIT ≤ 3.3 V?
The threshold accuracy is 0.5% typical for VIT ≤ 3.3 V.
