Overview
The TPS3808G50DBVR, 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, known for its low quiescent current and adjustable delay times, making it suitable for a wide range of applications, including battery-powered devices and high-reliability systems.
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) | 1.3 V ≤ VDD < 1.8 V, IOL = 0.4 mA | 0.3 | V | ||
| Threshold Voltage (VIT) | For TPS3808G50 | 4.65 | V | ||
| Reset Delay Time (td) | CT = Open | 12 | 20 | 28 | ms |
| Temperature Range (TJ) | –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 TPS3808G50DBVR?
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 TPS3808G50DBVR?
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 connecting it to an external capacitor. - What are the available package options for the TPS3808G50DBVR?
The device is available in SOT-23 and 2-mm × 2-mm WSON packages. - What is the temperature range for the TPS3808G50DBVR?
The temperature range is –40°C to 125°C. - How accurate is the threshold voltage for the TPS3808G50DBVR?
The threshold accuracy is 0.5% typical for VIT ≤ 3.3 V. - Can the TPS3808G50DBVR monitor any voltage rail?
- 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 should be considered when selecting the capacitor for the CT pin?
A low-leakage type capacitor such as a ceramic should be used, and stray capacitance around this pin should be minimized to avoid errors in the reset delay time. - What is the purpose of the manual reset (MR) input?
