Overview
The TPS3808G33QDBVRMO is a microprocessor supervisory circuit from Texas Instruments, designed to monitor system voltages and assert a RESET signal when the voltage drops below a preset threshold or when a manual reset is triggered. 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) | 1.8 V ≤ VDD ≤ 6.5 V, IOL = 1 mA | 0.4 | V | ||
| VIT (Negative-going input threshold accuracy) | VIT ≤ 3.3 V, –40°C < TJ < 85°C | –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 | ||
| 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
- User-adjustable reset delay time using an external capacitor
- Immunity to short negative transients on the SENSE pin
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 TPS3808G33QDBVRMO?
The primary function is to monitor system voltages and assert a RESET signal when the voltage drops below a preset threshold or when a manual reset is triggered.
- What is the typical quiescent current of the TPS3808G33QDBVRMO?
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 are the available package options for the TPS3808G33QDBVRMO?
The device is available in SOT-23 and 2-mm × 2-mm WSON packages.
- What is the temperature range for the TPS3808G33QDBVRMO?
The temperature range is –40°C to 125°C.
- How does the manual reset (MR) input work?
The manual reset (MR) input asserts the RESET signal when driven low, regardless of the SENSE pin voltage.
- What is the significance of the SENSE input?
The SENSE input monitors any system voltage and asserts the RESET signal if the voltage drops below the preset threshold (VIT).
- 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.
- Can the TPS3808G33QDBVRMO be used in battery-powered applications?
Yes, the device is well-suited for battery-powered applications due to its very low quiescent current.
- What is the threshold accuracy for the TPS3808G33QDBVRMO?
The threshold accuracy is typically 0.5% for VIT ≤ 3.3 V.
