Overview
The TPS3808G01DRVT, produced by Texas Instruments, is a low-quiescent-current, programmable-delay microprocessor supervisory circuit. This device is designed to 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 low for a user-adjustable delay time after both the manual reset (MR) and SENSE voltages return above their respective thresholds. The TPS3808G01DRVT is particularly suited for battery-powered 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 | ||
| VIT (Negative-going input threshold accuracy) | VIT ≤ 3.3 V | –1.5% | ±0.5% | 1.5% | % |
| VHYS (Hysteresis on VIT pin) | TPS3808G01 | 1.5% | 3% | % | |
| R_MR (MR Internal pullup resistance) | 70 | 90 | kΩ | ||
| ISENSE (Input current at SENSE pin) | VSENSE = VIT | –25 | 25 | nA | |
| IOH (RESET leakage current) | V_RESET = 6.5 V, RESET not asserted | 300 | nA | ||
| CIN (Input capacitance, any pin) | VIN = 0 V to VDD | 5 | pF | ||
| Temperature Range | –40°C | 125°C | °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
- 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 typical quiescent current of the TPS3808G01DRVT?
The typical quiescent current is 2.4 μA.
- What is the range of the adjustable delay time for the TPS3808G01DRVT?
The adjustable delay time ranges from 1.25 ms to 10 s.
- What are the available package types for the TPS3808G01DRVT?
The device is available in SOT-23 and 2-mm × 2-mm WSON packages.
- What is the temperature range for the TPS3808G01DRVT?
The temperature range is from –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 purpose of the SENSE input pin?
The SENSE input pin monitors any system voltage and asserts RESET if the voltage drops below the preset threshold.
- What is the effect of 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.
- How can the threshold voltage be adjusted for the TPS3808G01DRVT?
The threshold voltage can be adjusted using an external resistor divider for the TPS3808G01 version.
- What are some common applications for the TPS3808G01DRVT?
Common applications include DSP or microcontroller applications, notebook and desktop computers, PDAs, hand-held products, portable and battery-powered products, and FPGA and ASIC applications.
- What is the input supply range for the TPS3808G01DRVT?
The input supply range is from 1.7 V to 6.5 V.
