Overview
The TPS3808G25DBVRG4 is a low-quiescent-current, programmable-delay supervisory circuit produced by Texas Instruments. This device is part of the TPS3808 family, 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 TPS3808G25DBVRG4 is particularly suited for applications requiring precise voltage monitoring and adjustable reset delay times, making it ideal for battery-powered and low-power 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 | 5 | μA | |
| VOL (Low-level output voltage) | 1.8 V ≤ VDD ≤ 6.5 V, IOL = 1 mA | 0.4 | V | ||
| VIT (Negative-going input threshold accuracy) | VIT ≤ 3.3 V | –1.5% | ±0.5% | 1.5% | % |
| Threshold Voltage (VIT) | For TPS3808G25 | 2.33 V | V | ||
| Reset Delay Time | CT = Open | 12 ms | 20 ms | 28 ms | ms |
| Temperature Range | –40°C | 125°C | °C | ||
| Package | SOT-23 (6-pin) |
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
- Small SOT-23 and 2-mm × 2-mm WSON packages
- Temperature range: –40°C to 125°C
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 TPS3808G25DBVRG4?
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 typical quiescent current of the TPS3808G25DBVRG4?
The typical quiescent current is 2.4 μA.
- What is the range of the adjustable reset delay time?
The reset delay time can be adjusted from 1.25 ms to 10 s.
- What are the available package types for the TPS3808G25DBVRG4?
The device is available in SOT-23 and 2-mm × 2-mm WSON packages.
- What is the temperature range for the TPS3808G25DBVRG4?
The device is fully specified over a temperature range of –40°C to 125°C.
- How is the reset delay time adjusted?
The reset delay time can be adjusted by connecting the CT pin to an external capacitor or by using specific resistor configurations.
- What is the threshold voltage for the TPS3808G25DBVRG4?
The threshold voltage for the TPS3808G25 is 2.33 V.
- Can the TPS3808G25DBVRG4 be used in battery-powered applications?
Yes, it is well-suited for battery-powered applications due to its very low quiescent current.
- What is the propagation delay from MR to RESET?
The propagation delay from MR to RESET is typically 150 ns.
- How is the RESET output configured?
The RESET output is an open-drain output and typically requires a pullup resistor to hold the line high when RESET is not asserted.
