Overview
The TPS3305-18DGN is a dual-processor voltage supervisor from Texas Instruments, designed for circuit initialization in DSP and processor-based systems. This component is part of the TPS3305 family, which features dual supervisory circuits to monitor two separate supply voltages, typically core and I/O voltages. The device is particularly useful in systems that require robust power-on reset and watchdog timer functionalities.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | SOIC (D) | - |
| Pins | 8 | - |
| Operating Temperature Range | -40 to 85 | °C |
| Supply Voltage Range | 2.7 to 6 | V |
| Power-On Reset Delay Time | 200ms (typ) | - |
| Watchdog Timer Timeout | 1.6s (typ) | - |
| Maximum Supply Current | 40µA | - |
| Threshold Voltages (SENSE1, SENSE2) | 3.3V, 1.8V (for TPS3305-18) | V |
| Output Current (IOL, IOH) | 5mA, -5mA | - |
Key Features
- Dual Supervisory Circuits for DSP- and processor-based systems
- Power-On Reset Generator with a fixed delay time of 200ms; no external capacitor needed
- Watchdog Timer that retriggers 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
- Operating Temperature Range: -40°C to +85°C
Applications
- Processor Supply Monitoring
- Industrial Equipment
- Automotive Systems
- Portable/Battery-Powered Equipment
- Wireless Communication Systems
- Notebook/Desktop Computers
Q & A
- What is the primary function of the TPS3305-18DGN?
The primary function of the TPS3305-18DGN is to provide dual supervisory circuits for monitoring two separate supply voltages in DSP and processor-based systems, ensuring proper circuit initialization and reset functionalities.
- What are the typical threshold voltages for SENSE1 and SENSE2 in the TPS3305-18DGN?
The typical threshold voltages for SENSE1 and SENSE2 in the TPS3305-18DGN are 3.3V and 1.8V, respectively.
- What is the purpose of the watchdog timer in the TPS3305-18DGN?
The watchdog timer in the TPS3305-18DGN retriggers the RESET output if the watchdog input (WDI) is not toggled within 1.6 seconds, ensuring system stability and preventing lock-ups.
- What is the operating temperature range of the TPS3305-18DGN?
The operating temperature range of the TPS3305-18DGN is -40°C to +85°C.
- What is the maximum supply current of the TPS3305-18DGN?
The maximum supply current of the TPS3305-18DGN is 40µA.
- In what packages is the TPS3305-18DGN available?
The TPS3305-18DGN is available in MSOP-8 and SO-8 packages.
- What is the power-on reset delay time of the TPS3305-18DGN?
The power-on reset delay time of the TPS3305-18DGN is typically 200ms.
- What are some common applications of the TPS3305-18DGN?
Common applications include processor supply monitoring, industrial equipment, automotive systems, portable/battery-powered equipment, wireless communication systems, and notebook/desktop computers.
- Does the TPS3305-18DGN require an external capacitor for the power-on reset function?
No, the TPS3305-18DGN does not require an external capacitor for the power-on reset function.
- What is the supply voltage range of the TPS3305-18DGN?
The supply voltage range of the TPS3305-18DGN is from 2.7V to 6V.
