Microprocessor Supervisory Circuits The MAX691EWE is a microprocessor (μP) supervisory circuit manufactured by Maxim Integrated. Below are its key specifications, descriptions, and features:
### **Specifications:**
- **Manufacturer:** Maxim Integrated
- **Part Number:** MAX691EWE
- **Package:** 16-pin Wide SOIC (SO)
- **Operating Voltage Range:** 1.2V to 5.5V
- **Reset Threshold Options:** Adjustable or fixed (factory-set)
- **Reset Timeout Period:** 200ms (typical)
- **Watchdog Timer:** Yes, with 1.6s timeout (typical)
- **Manual Reset Input:** Yes
- **Battery Backup Switching:** Yes, for CMOS RAM or real-time clock (RTC)
- **Supply Current:** 35μA (typical)
- **Operating Temperature Range:** -40°C to +85°C
### **Descriptions:**
The MAX691EWE is a comprehensive μP supervisory circuit designed to monitor power supply voltages, provide reset signals, and ensure system reliability. It includes a watchdog timer, manual reset input, and battery backup switching for memory or RTCs. It operates over a wide voltage range, making it suitable for battery-powered and low-power applications.
### **Features:**
- **Power-Fail Comparator:** Monitors input voltage for early warning of power failure.
- **Battery Backup Switchover:** Automatically switches to backup battery when primary power fails.
- **Low Quiescent Current:** Ensures minimal power drain in battery-backed applications.
- **Watchdog Timer:** Resets the system if software fails to toggle the watchdog input.
- **Manual Reset Input:** Allows external pushbutton reset control.
- **Adjustable Reset Threshold:** Configurable via external resistors (if not fixed).
- **Wide Operating Voltage Range:** Supports 1.2V to 5.5V systems.
This information is based solely on the manufacturer's datasheet and technical documentation.
