Overview
The TPS3808G19DBVT, produced by Texas Instruments, is a part of the TPS3808 family of microprocessor supervisory circuits. These devices are 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. The TPS3808G19DBVT is particularly suited for applications requiring precise voltage monitoring and adjustable reset delay times.
The device features a very low quiescent current of 2.4 μA, making it ideal for battery-powered and power-sensitive applications. It is available in small 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) | 1.3 V ≤ VDD < 1.8 V, IOL = 0.4 mA | 0.3 | V | ||
| VOL (Low-level output voltage) | 1.8 V ≤ VDD ≤ 6.5 V, IOL = 1 mA | 0.4 | V | ||
| Threshold Voltage (VIT) | For TPS3808G19 | 1.77 | V | ||
| Reset Delay Time | CT = Open | 12 | 20 | 28 | ms |
| Reset Delay Time | CT = VDD | 180 | 300 | 420 | ms |
| Propagation Delay (MR to RESET) | VIH = 0.7 VDD, VIL = 0.3 VDD | 150 | ns |
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
- 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 TPS3808G19DBVT?
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 TPS3808G19DBVT?
The typical quiescent current is 2.4 μA.
- What are the available package options for the TPS3808G19DBVT?
The device is available in SOT-23 and 2-mm × 2-mm WSON packages.
- 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 using an external capacitor.
- What is the temperature range for the TPS3808G19DBVT?
The device operates over a temperature range of –40°C to 125°C.
- What is the threshold voltage for the TPS3808G19DBVT?
The threshold voltage (VIT) for the TPS3808G19 is 1.77 V.
- Can the TPS3808G19DBVT monitor any voltage rail?
The device can monitor system voltages from 0.4 V to 5 V, with the TPS3808G01 version capable of monitoring any voltage rail down to 0.405 V using an external resistor divider.
- How does the manual reset (MR) function work?
The manual reset (MR) input allows the RESET signal to be asserted when the MR pin is driven low.
- What is the propagation delay from MR to RESET?
The propagation delay from MR to RESET is typically 150 ns.
- Is the TPS3808G19DBVT immune to 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.
