Overview
The TPS3305-33DR 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 features a dual monitor topology, making it well-suited for applications requiring both core and I/O supply voltages. It includes a power-on reset generator with a fixed delay, a watchdog timer, and temperature-compensated voltage references.
Key Specifications
| Parameter | Min | Max | Unit | |
|---|---|---|---|---|
| Supply Voltage Range (VDD) | 2.7 | - | 6.0 | V |
| Operating Junction Temperature Range | -40 | - | +85 | °C |
| Threshold Voltage (SENSE1) | 4.46 | 4.55 | 4.64 | V |
| Threshold Voltage (SENSE2) | 2.86 | 2.93 | 3.00 | V |
| Supply Current (IDD) | - | 40 | - | µA |
| Watchdog Timer Input (WDI) Timeout | - | 1.6 | - | s |
| Reset Delay Time | - | 200 | - | ms |
| Package Type | - | SOIC D | - | - |
| Number of Pins | - | 8 | - | - |
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 retriggers the RESET output if the watchdog input is not toggled within 1.6 seconds.
- Temperature-compensated voltage references.
- Maximum supply current of 40µA.
- Defined RESET output from VDD ≥ 1.1V.
- Available in MSOP-8 and SO-8 packages.
Applications
- Industrial Equipment
- Automotive Systems
- Portable/Battery-Powered Equipment
- Wireless Communication Systems
- Notebook/Desktop Computers
- DSP and processor-based systems
Q & A
- What is the primary function of the TPS3305-33DR?
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 TPS3305-33DR?
The supply voltage range is from 2.7V to 6.0V. - What is the typical reset delay time for the TPS3305-33DR?
The typical reset delay time is 200ms. - What is the watchdog timer timeout period?
The watchdog timer timeout period is typically 1.6 seconds. - In what packages is the TPS3305-33DR available?
The device is available in MSOP-8 and SO-8 packages. - What is the operating junction temperature range for the TPS3305-33DR?
The operating junction temperature range is from -40°C to +85°C. - What is the maximum supply current of the TPS3305-33DR?
The maximum supply current is 40µA. - Does the TPS3305-33DR require an external capacitor for the power-on reset?
No, it does not require an external capacitor for the power-on reset. - What are the threshold voltages for SENSE1 and SENSE2 in the TPS3305-33DR?
The threshold voltage for SENSE1 is typically 4.55V, and for SENSE2, it is typically 2.93V. - In which types of systems is the TPS3305-33DR commonly used?
It is commonly used in DSP and processor-based systems, industrial equipment, automotive systems, portable/battery-powered equipment, wireless communication systems, and notebook/desktop computers.
