Overview
The TPS3808G25DRVT, produced by Texas Instruments, is a microprocessor supervisory circuit 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. This device is part of the TPS3808 family, which offers high precision and low power consumption, making it suitable for a wide range of applications, including battery-powered devices.
The TPS3808G25DRVT can monitor system voltages from 0.4 V to 5 V and features adjustable reset delay times, very low quiescent current, and high threshold accuracy. It is available in small SOT-23 and 2-mm × 2-mm WSON packages, and is fully specified over a temperature range of –40°C to 125°C.
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 | 5 | μA | |
| VOL (Low-level output voltage) | 1.8 V ≤ VDD ≤ 6.5 V, IOL = 1 mA | 0.4 | V | ||
| tw (Input pulse width to RESET) | SENSE, VIH = 1.05 VIT, VIL = 0.95 VIT | 20 | μs | ||
| td (RESET delay time) | CT = Open | 12 | 20 | 28 | ms |
| Propagation delay MR to RESET | VIH = 0.7 VDD, VIL = 0.3 VDD | 150 | ns | ||
| Operating temperature range | –40 | 125 | °C | ||
| Package | SOT-23 (6), WSON (6) |
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 TPS3808G25DRVT?
The primary function of the TPS3808G25DRVT 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 reset delay times available for the TPS3808G25DRVT?
The reset delay time can be set between 1.25 ms and 10 s, and can also be fixed at 20 ms or 300 ms depending on the configuration of the CT pin.
- What is the typical quiescent current of the TPS3808G25DRVT?
The typical quiescent current is 2.4 μA.
- What are the available package types for the TPS3808G25DRVT?
The device is available in SOT-23 and 2-mm × 2-mm WSON packages.
- What is the operating temperature range of the TPS3808G25DRVT?
The operating temperature range is –40°C to 125°C.
- How can the reset threshold voltage be adjusted for the TPS3808G25DRVT?
The reset threshold voltage can be factory-set for standard voltage rails or adjusted using the TPS3808G01 version to any voltage above 0.405 V.
- What is the significance 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, and it requires an external pull-up resistor to hold the line high when not asserted.
- What types of applications are the TPS3808G25DRVT suited for?
The device is suited for DSP or microcontroller applications, notebook and desktop computers, PDAs, hand-held products, portable and battery-powered products, and FPGA and ASIC applications.
- How is the propagation delay from MR to RESET specified?
The propagation delay from MR to RESET is specified as 150 ns with VIH = 0.7 VDD and VIL = 0.3 VDD.
