Overview
The TPS3808G50DBVRG4, 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 offers adjustable delay times and high threshold accuracy, 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 |
|---|---|---|---|---|---|
| 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) | 1.3 V ≤ VDD < 1.8 V, IOL = 0.4 mA | 0.3 | 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 | |
| tw (Input pulse width to RESET) | SENSE, VIH = 1.05 VIT, VIL = 0.95 VIT | 20 | μs | ||
| td (RESET delay time) | CT = Open | 12 | 20 | 28 | ms |
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 TPS3808G50DBVRG4?
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 TPS3808G50DBVRG4?
The typical quiescent current is 2.4 μA. - How can the reset delay time be adjusted on the TPS3808G50DBVRG4?
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 TPS3808G50DBVRG4?
The device is available in SOT-23 and 2-mm × 2-mm WSON packages. - What is the temperature range for the TPS3808G50DBVRG4?
The temperature range is –40°C to 125°C. - How accurate is the threshold voltage for the TPS3808G50DBVRG4?
The threshold accuracy is typically ±0.5% for VIT ≤ 3.3 V. - Can the TPS3808G50DBVRG4 be used in battery-powered applications?
Yes, it is well-suited for battery-powered applications due to its low quiescent current. - What is the purpose of the MR pin on the TPS3808G50DBVRG4?
The MR pin is for manual reset and can be driven low to assert the RESET signal. - How does the TPS3808G50DBVRG4 handle short negative transients on the SENSE pin?
The device is relatively immune to short negative transients, with sensitivity dependent on threshold overdrive. - What types of applications benefit from using the TPS3808G50DBVRG4?
It is beneficial for DSP, microcontroller, notebook, desktop, PDA, hand-held, portable, and battery-powered products, as well as FPGA and ASIC applications.
