Overview
The TPS3705-33DGNR, produced by Texas Instruments, is a microprocessor supply-voltage supervisor that provides circuit initialization and timing supervision. This device is part of the TPS370x-xx family, which is designed primarily for DSP and processor-based systems. It features an integrated reference and comparator for VDD supervision, a power-fail supervisor, and a manual reset input. The TPS3705-33DGNR specifically includes a watchdog timer, which is a key feature for ensuring system reliability.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage (VDD) | 2 V to 6 V | V |
| Threshold Voltage | 2.93 V | V |
| Maximum Supply Current | 50 µA | µA |
| Operating Temperature | –40°C to 125°C | °C |
| Package Type | 8-Pin MSOP, 8-Pin SOIC | |
| Power-Up Reset Delay | 200 ms | ms |
| Watchdog Timeout | 1.6 seconds (typical) | s |
| Low-Level Output Voltage (VOL) | 0.3 V (at IOL = 1 mA) | V |
| High-Level Output Voltage (VOH) | 0.7 × VDD (at IOH = –500 µA) | V |
Key Features
- Power-on reset generator with a fixed delay time of 200 ms (no external capacitor needed)
- Precision supply voltage monitor for 2.5 V, 3 V, 3.3 V, and 5 V
- Integrated watchdog timer (specific to TPS3705-xx devices)
- Voltage monitor for power-fail or low-battery warning
- Manual reset input (MR)
- Pin-for-pin compatible with the MAX705 through MAX708 Series
- Maximum supply current of 50 µA
- Operating temperature range: –40°C to 125°C for TPS3705-33
Applications
- Designs using DSPs, microcontrollers, or microprocessors
- Industrial equipment
- Programmable controls
- Automotive systems
- Portable or battery-powered equipment
- Intelligent instruments
- Wireless communication systems
- Notebook or desktop computers
Q & A
- What is the primary function of the TPS3705-33DGNR?
The primary function is to provide circuit initialization and timing supervision for DSP and processor-based systems. - What is the operating temperature range for the TPS3705-33DGNR?
The operating temperature range is –40°C to 125°C. - Does the TPS3705-33DGNR include a watchdog timer?
Yes, it includes an integrated watchdog timer. - What is the power-up reset delay time for the TPS3705-33DGNR?
The power-up reset delay time is 200 ms. - What are the typical applications for the TPS3705-33DGNR?
Typical applications include designs using DSPs, microcontrollers, or microprocessors, industrial equipment, automotive systems, and more. - What is the maximum supply current for the TPS3705-33DGNR?
The maximum supply current is 50 µA. - Is the TPS3705-33DGNR pin-for-pin compatible with other devices?
Yes, it is pin-for-pin compatible with the MAX705 through MAX708 Series. - What is the threshold voltage for the TPS3705-33DGNR?
The threshold voltage is 2.93 V. - What package types are available for the TPS3705-33DGNR?
The device is available in 8-Pin MSOP and 8-Pin SOIC packages. - How does the manual reset input work on the TPS3705-33DGNR?
A low level at the manual reset input (MR) causes the RESET output to become active.
