Overview
The TPS3808G15DBVR, 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 is known for its low quiescent current and programmable delay features, making it suitable for a wide range of applications, including battery-powered devices.
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 TPS3808G15 | 1.40 | V | ||
| Threshold Accuracy | VIT ≤ 3.3 V | –1.5% | ±0.5% | 1.5% | % |
| Reset Delay Time | CT = Open | 12 | 20 | 28 | ms |
| Temperature Range | –40 | 125 | °C | ||
| Package | SOT-23 (6), 2-mm × 2-mm 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 TPS3808G15DBVR? 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 TPS3808G15DBVR? 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, leaving it open, or using an external capacitor to set a delay between 1.25 ms and 10 s.
- What are the available package options for the TPS3808G15DBVR? The device is available in SOT-23 and 2-mm × 2-mm WSON packages.
- What is the temperature range for the TPS3808G15DBVR? The device operates over a temperature range of –40°C to 125°C.
- How accurate is the threshold voltage for the TPS3808G15DBVR? The threshold accuracy is ±0.5% for VIT ≤ 3.3 V.
- Can the TPS3808G15DBVR monitor any voltage rail? Yes, it can monitor system voltages from 0.4 V to 5 V, including adjustable thresholds.
- What is the purpose of the manual reset (MR) input? The MR input allows for manual assertion of the RESET signal by driving it low.
- How does the RESET output behave? The RESET output remains low for the user-adjustable delay time after the SENSE voltage and manual reset (MR) return above their respective thresholds.
- What are some common applications for the TPS3808G15DBVR? Common applications include DSP or microcontroller systems, notebook and desktop computers, PDAs, hand-held products, and portable battery-powered devices.
