Overview
The TPS3808G09DBVTG4, 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 is well-suited for battery-powered applications due to its very low typical quiescent current of 2.4 μA. It is available in small SOT-23 and 2-mm × 2-mm WSON packages and is fully specified 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 | |
| Supply Current (IDD) | VDD = 3.3 V, RESET not asserted, MR, RESET, CT open | 2.4 | 5 | μA | |
| Low-Level Output Voltage (VOL) | 1.8 V ≤ VDD ≤ 6.5 V, IOL = 1 mA | 0.4 | V | ||
| Threshold Voltage (VIT) | For TPS3808G09 | 0.84 | V | ||
| Threshold Accuracy | VIT ≤ 3.3 V | –1.5% | ±0.5% | 1.5% | % |
| Reset Delay Time | CT = Open | 12 | 20 | 28 | ms |
| Reset Delay Time | CT = VDD | 180 | 300 | 420 | ms |
| Propagation Delay | MR to RESET | 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
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 TPS3808G09DBVTG4? 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 TPS3808G09DBVTG4? The typical quiescent current is 2.4 μA.
- What are the available package options for the TPS3808G09DBVTG4? The device is available in SOT-23 and 2-mm × 2-mm WSON packages.
- What is the temperature range for the TPS3808G09DBVTG4? The device is fully specified over a temperature range of –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, leaving it open, or using an external capacitor to set a user-defined delay between 1.25 ms and 10 s.
- What is the threshold voltage for the TPS3808G09DBVTG4? The threshold voltage for the TPS3808G09 is 0.84 V.
- What is the threshold accuracy for the TPS3808G09DBVTG4? The threshold accuracy is ±0.5% for VIT ≤ 3.3 V.
- How does the manual reset (MR) input work? The MR input asserts the RESET signal when driven low and de-asserts it when returned to a logic high state after the reset delay period.
- What is the propagation delay from MR to RESET? The propagation delay from MR to RESET is 150 ns.
- In which types of applications is the TPS3808G09DBVTG4 commonly used? It is commonly used in DSP or microcontroller applications, notebook and desktop computers, PDAs, hand-held products, portable and battery-powered products, and FPGA and ASIC applications.
