Microprocessor Supervisory Circuits The MAX691CWE is a microprocessor (μP) supervisory circuit manufactured by Maxim Integrated (now part of Analog Devices). Below are its specifications, descriptions, and features:
### **Specifications:**
- **Manufacturer:** Maxim Integrated (now Analog Devices)
- **Package:** 16-pin Wide SOIC (CWE)
- **Supply Voltage Range:** 1.2V to 5.5V
- **Operating Temperature Range:** -40°C to +85°C
- **Reset Threshold Accuracy:** ±1.5% (typical)
- **Reset Timeout Period:** Adjustable or fixed (depends on configuration)
- **Watchdog Timer:** Yes (programmable)
- **Manual Reset Input:** Yes
- **Battery Backup Switching:** Yes (for CMOS RAM)
- **Low Quiescent Current:** Typically 5µA (in battery backup mode)
### **Descriptions:**
The MAX691CWE is a comprehensive μP supervisory circuit designed to monitor power supply voltages, provide reset signals, and manage battery backup for CMOS RAM. It ensures reliable system operation by monitoring VCC and generating a reset signal if the voltage falls below a preset threshold. It also includes a watchdog timer to detect software lockups and a manual reset input for user-initiated resets.
### **Features:**
- **Voltage Monitoring:** Monitors VCC for undervoltage conditions.
- **Reset Output:** Active-low or active-high reset signal with adjustable or fixed timeout.
- **Watchdog Timer:** Prevents system lockup by requiring periodic toggling.
- **Battery Backup:** Automatically switches to backup battery when VCC fails.
- **Low Power Consumption:** Minimal current draw in battery backup mode.
- **Manual Reset Input:** Allows external push-button reset control.
- **Wide Operating Voltage Range:** Supports systems from 1.2V to 5.5V.
- **High Accuracy Reset Threshold:** Ensures reliable system monitoring.
For exact datasheet details, refer to the official documentation from Maxim Integrated (Analog Devices).
