Overview
The TPS3808G33DRVT 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 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.
The TPS3808G33DRVT is specifically configured for a 3.3V nominal supply voltage with a threshold voltage of 3.07V. It features a very low quiescent current of 2.4 μA, high threshold accuracy, and adjustable reset delay times. The device is available in SOT-23 and 2-mm × 2-mm WSON packages and operates 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 | 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 < 125°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 | ||
| ISENSE (Input current at SENSE pin) | VSENSE = VIT | –25 | 25 | nA | |
| td (RESET delay time) | CT = Open | 12 | 20 | 28 | ms |
| td (RESET delay time) | CT = VDD | 180 | 300 | 420 | 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 TPS3808G33DRVT?
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 nominal supply voltage and threshold voltage for the TPS3808G33DRVT?
The nominal supply voltage is 3.3 V, and the threshold voltage is 3.07 V.
- What are the options for setting the RESET delay time?
The RESET delay time can be set to 20 ms by leaving the CT pin open, 300 ms by connecting the CT pin to VDD, or user-adjusted between 1.25 ms and 10 s by connecting the CT pin to an external capacitor.
- What is the typical quiescent current of the TPS3808G33DRVT?
The typical quiescent current is 2.4 μA.
- What are the package options for the TPS3808G33DRVT?
The device is available in SOT-23 and 2-mm × 2-mm WSON packages.
- What is the operating temperature range of the TPS3808G33DRVT?
The operating temperature range is –40°C to 125°C.
- How does the TPS3808G33DRVT 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 TPS3808G33DRVT be used to monitor any voltage rail down to 0.405 V?
Yes, the TPS3808G01 version can be used to monitor any voltage rail down to 0.405 V using an external resistor divider.
- What is the purpose of the MR pin?
The MR pin is used for manual reset and can be driven low to assert the RESET signal.
- How is the RESET output configured?
The RESET output is an open-drain output that remains high (unasserted) as long as SENSE is above its threshold and the manual reset (MR) is logic high.
