Overview
The TPS3305-18DRG4 is a micropower supply voltage supervisor from Texas Instruments, designed for circuit initialization in dual-supply voltage systems. This device is particularly suited for use in DSP and processor-based systems that require monitoring of both core and I/O supply voltages. It features a dual monitor topology, a power-on reset generator, and a watchdog timer, making it ideal for ensuring system reliability and stability.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage Range (VDD) | 2.7 | 6.0 | V | |
| Operating Junction Temperature Range | –40 | +85 | °C | |
| Threshold Voltage (SENSE1) | 2.93 | 3.0 | 3.07 | V |
| Threshold Voltage (SENSE2) | 1.68 | 1.8 | 1.92 | V |
| Watchdog Timer Timeout | 1.4 | 1.6 | 1.8 | s |
| Power-On Reset Delay | 180 | 200 | 220 | ms |
| Supply Current (IDD) | 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 (core and I/O).
- Power-on reset generator with a fixed delay of 200ms, no external capacitor needed.
- Watchdog timer that re-triggers the RESET output if the watchdog input is not toggled within 1.6 seconds.
- Temperature-compensated voltage reference.
- Maximum supply current of 40µA.
- Defined RESET output from VDD ≥ 1.1V.
- Available in MSOP-8 and SO-8 packages.
Applications
- Processor supply monitoring in industrial equipment.
- Automotive systems.
- Portable and battery-powered equipment.
- Wireless communication systems.
- Notebook and desktop computers.
Q & A
- What is the primary function of the TPS3305-18DRG4? The primary function is to monitor two supply voltages and provide a reset signal if either voltage falls below its threshold.
- What is the typical power-on reset delay of the TPS3305-18DRG4? The typical power-on reset delay is 200ms.
- What is the watchdog timer timeout for the TPS3305-18DRG4? The watchdog timer timeout is typically 1.6 seconds.
- What is the maximum supply current of the TPS3305-18DRG4? The maximum supply current is 40µA.
- What are the available package options for the TPS3305-18DRG4? The device is available in MSOP-8 and SO-8 packages.
- What is the operating junction temperature range of the TPS3305-18DRG4? The operating junction temperature range is –40°C to +85°C.
- What are the threshold voltages for SENSE1 and SENSE2 in the TPS3305-18DRG4? The threshold voltages are typically 3.0V for SENSE1 and 1.8V for SENSE2.
- Does the TPS3305-18DRG4 require an external capacitor for the power-on reset? No, it does not require an external capacitor for the power-on reset.
- What is the purpose of the manual reset (MR) input on the TPS3305-18DRG4? The manual reset input allows for a manual reset of the system by asserting the RESET output.
- What are some common applications of the TPS3305-18DRG4? Common applications include industrial equipment, automotive systems, portable and battery-powered equipment, wireless communication systems, and notebook/desktop computers.
