Overview
The TPS3808G15DRVT, produced by Texas Instruments, is a microprocessor supervisory circuit designed to monitor system voltages and generate a power-on reset signal. This device is part of the TPS3808 family, which is known for its low quiescent current and high threshold accuracy. It is particularly suited for battery-powered applications due to its very low typical quiescent current of 2.4 μA. The TPS3808G15DRVT can monitor system voltages from 0.4 V to 5 V and assert an open-drain RESET signal when the SENSE voltage drops below a preset threshold or when the manual reset (MR) pin is driven low. The RESET output remains asserted for a user-adjustable delay time after both the manual reset and SENSE voltages return above their respective thresholds.
Key Specifications
| Parameter | Test Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| VDD Input Supply Range | –40°C < TJ < 125°C | 1.7 | 6.5 | V | |
| Supply Current (IDD) | VDD = 3.3 V, RESET not asserted, MR, RESET, CT open | 2.4 | 5 | μA | |
| Low-Level Output Voltage (VOL) | 1.3 V ≤ VDD < 1.8 V, IOL = 0.4 mA | 0.3 | V | ||
| Low-Level Output Voltage (VOL) | 1.8 V ≤ VDD ≤ 6.5 V, IOL = 1 mA | 0.4 | V | ||
| RESET Delay Time (td) | CT = Open | 12 | 20 | 28 | ms |
| RESET Delay Time (td) | CT = VDD | 180 | 300 | 420 | ms |
| Operating Temperature Range | –40 | 125 | °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
- 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 typical quiescent current of the TPS3808G15DRVT?
The typical quiescent current is 2.4 μA.
- What is the range of the adjustable delay time for the RESET signal?
The adjustable delay time ranges from 1.25 ms to 10 s.
- What are the available package types for the TPS3808G15DRVT?
The device is available in SOT-23 and 2-mm × 2-mm WSON packages.
- What is the operating temperature range of the TPS3808G15DRVT?
The operating temperature range is –40°C to 125°C.
- How can the RESET delay time be adjusted?
The RESET delay time can be adjusted by connecting the CT pin to VDD using a resistor, leaving the CT pin open, or using an external capacitor connected to the CT pin.
- What is the threshold accuracy of the TPS3808G15DRVT for VIT ≤ 3.3 V?
The threshold accuracy is 0.5% typical for VIT ≤ 3.3 V.
- Can the threshold voltage be adjusted?
- What types of applications are the TPS3808G15DRVT suited for?
The device is suited for DSP or microcontroller applications, notebook and desktop computers, PDAs, hand-held products, portable and battery-powered products, and FPGA and ASIC applications.
- How does the manual reset (MR) input function?
The manual reset (MR) input asserts the RESET signal when driven low.
- What type of output does the RESET pin have?
The RESET output is an open-drain output.
