Overview
The TPS3808G25DBVR, 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 DSP, microcontroller, notebook, and portable battery-powered devices.
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 (Threshold voltage) | For TPS3808G25 | 2.33 | 2.33 | V | |
| VHYS (Hysteresis on VIT pin) | Fixed versions | 1% | 2.5% | ||
| Reset Delay Time | CT = Open | 12 | 20 | 28 | ms |
| Reset Delay Time | CT = VDD | 180 | 300 | 420 | ms |
| Temperature Range | –40°C | 125°C | °C | ||
| Package | SOT-23 (6), WSON (6) |
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 TPS3808G25DBVR?
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 range of the adjustable delay time for the TPS3808G25DBVR?
The adjustable delay time ranges from 1.25 ms to 10 s.
- What is the typical quiescent current of the TPS3808G25DBVR?
The typical quiescent current is 2.4 μA.
- What are the available package types for the TPS3808G25DBVR?
The device is available in SOT-23 and 2-mm × 2-mm WSON packages.
- What is the temperature range for the TPS3808G25DBVR?
The 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 connecting a capacitor between CT and GND.
- What is the threshold voltage for the TPS3808G25DBVR?
The threshold voltage for the TPS3808G25 is 2.33 V.
- What types of applications are the TPS3808G25DBVR suited for?
The device is suited for DSP, microcontroller, notebook, desktop, PDA, hand-held, portable, and battery-powered applications, as well as FPGA and ASIC applications.
- How does the manual reset (MR) input work?
The manual reset (MR) input asserts the RESET signal when driven low.
- What is the purpose of the open-drain RESET output?
The open-drain RESET output allows the RESET signal to be pulled up to a voltage higher than VDD using an external pull-up resistor.
