Overview
The TPS3808G15DRVR, produced by Texas Instruments, is a low-quiescent-current, programmable-delay microprocessor supervisory circuit. This device is 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 TPS3808 family supports a wide range of voltage thresholds from 0.4 V to 5 V, making it versatile for various applications. The device features a precision reference that achieves 0.5% threshold accuracy for voltages up to 3.3 V, ensuring reliable operation. It is particularly suited for battery-powered and low-power applications due to its very low typical quiescent current of 2.4 μA.
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 | ||
| tw (Input pulse width to RESET) | SENSE VIH = 1.05 VIT, VIL = 0.95 VIT | 20 | μs | ||
| td (RESET delay time) | CT = Open | 12 | 20 | 28 | ms |
| Propagation delay (MR to RESET) | VIH = 0.7 VDD, VIL = 0.3 VDD | 150 | ns | ||
| 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
- 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 typical quiescent current of the TPS3808G15DRVR?
The typical quiescent current is 2.4 μA.
- What is the range of adjustable delay times for the TPS3808G15DRVR?
The adjustable delay time ranges from 1.25 ms to 10 s.
- What are the available package options for the TPS3808G15DRVR?
The device is available in SOT-23 (6) and WSON (6) packages.
- What is the temperature range for the TPS3808G15DRVR?
The device is fully specified over a temperature range of –40°C to 125°C.
- How can the reset delay time be adjusted on the TPS3808G15DRVR?
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 threshold accuracy for the TPS3808G15DRVR?
The device achieves 0.5% threshold accuracy for VIT ≤ 3.3 V.
- Can the TPS3808G15DRVR monitor any voltage rail down to 0.4 V?
- What is the propagation delay from MR to RESET?
The propagation delay from MR to RESET is 150 ns.
- Is the TPS3808G15DRVR immune to short negative transients on the SENSE pin?
- What are some common applications for the TPS3808G15DRVR?
