Overview
The TPS3305-18DGNRG4 is a micropower supply voltage supervisor from Texas Instruments, designed for circuit initialization in dual-supply voltage systems, particularly in DSP and processor-based systems. This device is part of the TPS3305 family and is available in an 8-pin HVSSOP package. It features a dual monitor topology, making it well-suited for applications requiring two supply voltages, such as core and I/O voltages.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage Range (VDD) | 2.7 | 6.0 | V | |
| Operating Junction Temperature Range | –40 | +85 | °C | |
| SENSE1 Threshold Voltage (VIT1) | 2.93 | 3.0 | 3.07 | V |
| SENSE2 Threshold Voltage (VIT2) | 1.68 | 1.8 | 1.92 | V |
| Power-On Reset Delay Time | 200 | ms | ||
| Watchdog Timer Timeout | 1.6 | s | ||
| Maximum Supply Current | 40 | µA | ||
| High-Level Output Voltage (VOH) | VDD - 0.4 | V | ||
| Low-Level Output Voltage (VOL) | 0.4 | V |
Key Features
- Dual supervisory circuits for monitoring two supply voltages, making it suitable for DSP and processor-based systems.
- Power-On Reset generator with a fixed delay of 200ms, requiring no external capacitor.
- Watchdog timer that re-triggers the RESET output if the watchdog input is not toggled within 1.6 seconds.
- Temperature-compensated voltage reference.
- Manual reset input.
- Active-low and active-high reset outputs.
- Available in MSOP-8 and SO-8 packages.
- Operating temperature range from –40°C to +85°C.
Applications
- Industrial Equipment
- Automotive Systems
- Portable/Battery-Powered Equipment
- Wireless Communication Systems
- Notebook/Desktop Computers
Q & A
- What is the primary function of the TPS3305-18DGNRG4?
The primary function is to supervise and manage the power-on reset and watchdog timer for dual-supply voltage systems in DSP and processor-based applications. - What is the supply voltage range for the TPS3305-18DGNRG4?
The supply voltage range is from 2.7V to 6.0V. - What are the threshold voltages for SENSE1 and SENSE2 in the TPS3305-18DGNRG4?
The threshold voltage for SENSE1 is approximately 3.0V, and for SENSE2, it is approximately 1.8V. - How long is the power-on reset delay time?
The power-on reset delay time is 200ms. - What happens if the watchdog input is not toggled within the specified time?
If the watchdog input is not toggled within 1.6 seconds, the RESET output is asserted. - In what temperature range can the TPS3305-18DGNRG4 operate?
The device operates over a temperature range of –40°C to +85°C. - What are the available package types for the TPS3305-18DGNRG4?
The device is available in MSOP-8 and SO-8 packages. - What is the maximum supply current of the TPS3305-18DGNRG4?
The maximum supply current is 40µA. - Does the TPS3305-18DGNRG4 require an external capacitor for the power-on reset?
No, it does not require an external capacitor for the power-on reset. - What are some common applications of the TPS3305-18DGNRG4?
Common applications include industrial equipment, automotive systems, portable/battery-powered equipment, wireless communication systems, and notebook/desktop computers.
