Microprocessor Supervisory Circuits The **MAX690EPA+** is a microprocessor (μP) supervisory circuit manufactured by **MAXIM** (now part of Analog Devices). Below are its key specifications, descriptions, and features:
### **Specifications:**
- **Manufacturer:** MAXIM (Analog Devices)
- **Part Number:** MAX690EPA+
- **Package:** 8-Pin PDIP (Plastic Dual In-Line Package)
- **Operating Voltage Range:** 1.2V to 5.5V
- **Reset Threshold Voltage:** Adjustable or fixed (depending on variant)
- **Reset Timeout Period:** Typically 200ms (adjustable in some versions)
- **Operating Temperature Range:** -40°C to +85°C
- **Quiescent Current:** Typically 10μA (low power consumption)
- **Watchdog Timer:** Yes (with programmable timeout)
- **Manual Reset Input:** Available (active-low)
- **Battery Backup Switchover:** Supports backup battery for power-fail protection
### **Descriptions:**
The MAX690EPA+ is a **μP supervisory circuit** designed to monitor power supply voltages and provide reset signals to microprocessors during power-up, power-down, or brownout conditions. It ensures reliable system operation by preventing erratic behavior due to unstable power.
### **Features:**
1. **Voltage Monitoring:** Monitors VCC and asserts reset if voltage falls below a preset threshold.
2. **Watchdog Timer:** Detects software crashes by requiring periodic toggling; triggers reset if inactive.
3. **Manual Reset Input:** Allows external push-button reset control.
4. **Low Power Consumption:** Ideal for battery-powered applications.
5. **Battery Backup Support:** Automatically switches to backup battery during power loss.
6. **Wide Operating Voltage:** Works from 1.2V to 5.5V, suitable for 3V/5V systems.
7. **Industrial Temperature Range:** Operates reliably in harsh environments (-40°C to +85°C).
For detailed electrical characteristics, refer to the **MAXIM datasheet** for the MAX690EPA+.
