Overview
The TPS3808G50DBVT from Texas Instruments is a microprocessor supervisory circuit designed to monitor system voltages and generate a reset signal when the voltage drops below a preset threshold or when the manual reset pin is driven low. This device is part of the TPS3808 family, which is known for its low quiescent current and high threshold accuracy. It is available in 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 | ||
| VIT (Negative-going input threshold accuracy) | VIT ≤ 3.3 V | –1.5% | ±0.5% | 1.5% | % |
| VHYS (Hysteresis on VIT pin) | Fixed versions | 1% | 2.5% | % | |
| R_MR (MR Internal pullup resistance) | 70 | 90 | kΩ | ||
| ISENSE (Input current at SENSE pin) | VSENSE = VIT | –25 | 25 | nA | |
| Operating temperature range | –40°C | 125°C | °C | ||
| Package | SOT-23 (6 pins) |
Key Features
- Power-on reset generator with adjustable delay time: 1.25 ms to 10 s.
- Very low quiescent current: 2.4 µA typical, making it suitable for battery-powered applications.
- 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 and open-drain RESET output.
- Small SOT-23 and 2-mm × 2-mm WSON packages.
- User-adjustable reset delay time using an external capacitor.
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 TPS3808G50DBVT?
The TPS3808G50DBVT is a microprocessor supervisory circuit that monitors system voltages and generates a reset signal when the voltage drops below a preset threshold or when the manual reset pin is driven low.
- What are the available package types for the TPS3808G50DBVT?
The TPS3808G50DBVT is available in SOT-23 and 2-mm × 2-mm WSON packages.
- What is the typical quiescent current of the TPS3808G50DBVT?
The typical quiescent current is 2.4 µA, making it suitable for battery-powered applications.
- 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 operating temperature range of the TPS3808G50DBVT?
The operating temperature range is –40°C to 125°C.
- What are the fixed threshold voltages available for the TPS3808G50DBVT?
Fixed threshold voltages are available for standard voltage rails from 0.9 V to 5 V, and adjustable voltage down to 0.4 V.
- Does the TPS3808G50DBVT have a manual reset feature?
Yes, it has a manual reset (MR) input.
- What type of output does the TPS3808G50DBVT have?
The TPS3808G50DBVT has an open-drain RESET output.
- How accurate is the threshold voltage of the TPS3808G50DBVT?
The threshold accuracy is typically 0.5% for VIT ≤ 3.3 V.
- What is the recommended capacitor value for setting the reset delay time?
The capacitor should be ≥ 100 pF nominal value, and the delay time can be calculated using the provided equation.
