Overview
The TPS3808G12DBVRG4 is a microprocessor supervisory circuit produced by Texas Instruments. It 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. This device is particularly useful in applications requiring low quiescent current and adjustable reset delay times.
Key Specifications
| Parameter | Test Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Input supply range (VDD) | –40°C < TJ < 125°C | 1.7 | 6.5 | V | |
| Supply current (IDD) | VDD = 3.3 V, RESET not asserted, MR, RESET, CT open | 2.4 | 5 | μA | |
| Low-level output voltage (VOL) | 1.8 V ≤ VDD ≤ 6.5 V, IOL = 1 mA | 0.4 | V | ||
| Threshold voltage (VIT) | For TPS3808G12 | 1.12 | V | ||
| Threshold accuracy | VIT ≤ 3.3 V | –1.5% | ±0.5% | 1.5% | % |
| Hysteresis on VIT pin | 1% | 2.5% | % | ||
| MR Internal pullup resistance | 70 | 90 | kΩ | ||
| Temperature range | –40°C | 125°C | °C |
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 TPS3808G12DBVRG4? 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 TPS3808G12DBVRG4? The typical quiescent current is 2.4 μA.
- How can the reset delay time be adjusted? The reset delay time can be adjusted by connecting the CT pin to VDD for a 300-ms delay, leaving the CT pin open for a 20-ms delay, or using an external capacitor for a user-defined delay between 1.25 ms and 10 s.
- What is the temperature range of the TPS3808G12DBVRG4? The temperature range is –40°C to 125°C.
- What are the available package types for the TPS3808G12DBVRG4? The device is available in SOT-23 and 2-mm × 2-mm WSON packages.
- How accurate is the threshold voltage of the TPS3808G12DBVRG4? The threshold accuracy is ±0.5% typical for VIT ≤ 3.3 V.
- Can the TPS3808G12DBVRG4 monitor any voltage rail? Yes, it can monitor any voltage rail down to 0.405 V using an external resistor divider.
- What is the purpose of the MR pin? The MR pin is used for manual reset, asserting the RESET signal when driven low.
- What is the significance of the SENSE input? The SENSE input allows monitoring of any system voltage, asserting the RESET signal if the voltage drops below the preset threshold.
- How does the device handle short negative transients on the SENSE pin? The device is relatively immune to short negative transients on the SENSE pin, with sensitivity dependent on threshold overdrive.
