Overview
The MAX708TESA+TG035 is a microprocessor (µP) supervisory circuit designed by Maxim Integrated, now part of Analog Devices Inc. This device is part of the MAX705–MAX708/MAX813L family, which integrates multiple supervisory functions to enhance system reliability and reduce the complexity and number of components required in µP systems. It monitors power-supply and battery functions, providing essential features such as reset outputs, watchdog timers, and power-fail warnings.
Key Specifications
| Parameter | Value | Units |
|---|---|---|
| Operating Temperature | -40°C to +85°C | °C |
| Mounting Type | Surface Mount | |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) | |
| Reset Timeout | 140ms Minimum | ms |
| Reset Threshold | 4.25V to 4.40V to 4.50V | V |
| Reset Pulse Width | 140ms to 200ms to 280ms | ms |
| Watchdog Timeout Period | 1.00s to 1.60s to 2.25s | s |
| Supply Current | 50µA to 500µA | µA |
| Operating Voltage Range | 1.0V to 5.5V | V |
Key Features
- Supervisory-Function Integration: Integrates reset output, watchdog timer, and power-fail warning to improve system reliability and reduce board space.
- Reset Output: Provides an active-high reset output, which is the complement of the active-low reset output, and is guaranteed to be valid with VCC down to 1.1V.
- Watchdog Timer: Monitors the µP’s activity and triggers a reset if the watchdog input is not toggled within 1.6 seconds.
- Manual Reset: Allows reset to be triggered by a pushbutton switch with a debounced TTL/CMOS-compatible manual-reset input.
- Power-Fail Warning: Includes a 1.25V threshold detector for power-fail warning or low-battery detection.
- Precision-Supply Voltage Monitor: Generates a reset pulse when the supply voltage drops below 4.40V.
- Package Options: Available in 8-pin DIP, SO, and µMAX packages.
Applications
- Computers: Used in various computer systems to ensure reliable power monitoring.
- Controllers: Employed in control systems that require precise power supervision.
- Intelligent Instruments: Integrated into intelligent instruments for robust power management.
- Critical µP Power Monitoring: Essential for critical microprocessor power monitoring in various industrial and embedded systems.
Q & A
- What is the primary function of the MAX708TESA+TG035?
The primary function is to monitor power-supply and battery functions in microprocessor systems, providing reset outputs, watchdog timers, and power-fail warnings.
- What are the operating temperature ranges for the MAX708TESA+TG035?
The operating temperature ranges are -40°C to +85°C.
- What is the reset threshold voltage for the MAX708TESA+TG035?
The reset threshold voltage is between 4.25V and 4.50V.
- How does the watchdog timer function in the MAX708TESA+TG035?
The watchdog timer monitors the µP’s activity and triggers a reset if the watchdog input is not toggled within 1.6 seconds.
- What is the purpose of the manual-reset input in the MAX708TESA+TG035?
The manual-reset input allows reset to be triggered by a pushbutton switch, providing a debounced TTL/CMOS-compatible input.
- What package options are available for the MAX708TESA+TG035?
The device is available in 8-pin DIP, SO, and µMAX packages.
- What is the minimum reset pulse width for the MAX708TESA+TG035?
The minimum reset pulse width is 140ms.
- How does the power-fail warning function work in the MAX708TESA+TG035?
The device includes a 1.25V threshold detector for power-fail warning or low-battery detection.
- What is the supply current range for the MAX708TESA+TG035?
The supply current range is from 50µA to 500µA.
- In which types of systems is the MAX708TESA+TG035 typically used?
It is typically used in computers, controllers, intelligent instruments, and critical microprocessor power monitoring applications.
