Microprocessor Supervisory Circuits The **MAX691ACSE+T** is a microprocessor (µP) supervisory circuit manufactured by **Maxim Integrated** (now part of Analog Devices). Below are its key specifications, descriptions, and features:
### **Specifications:**
- **Manufacturer:** Maxim Integrated
- **Series:** MAX691
- **Package/Case:** 16-SOIC (0.154", 3.90mm Width)
- **Operating Temperature Range:** **0°C to +70°C**
- **Supply Voltage (VCC):** **1.2V to 5.5V**
- **Reset Threshold Voltage:** Adjustable or fixed (depending on variant)
- **Reset Timeout Period:** Typically **200ms** (adjustable in some variants)
- **Watchdog Timer:** Yes, with programmable timeout
- **Manual Reset Input:** Yes (active-low)
- **Battery Backup Switching:** Supports automatic switchover to backup battery
- **Low Quiescent Current:** Typically **10µA** (in backup mode)
### **Descriptions:**
- The **MAX691ACSE+T** is designed to monitor power supply voltages in µP and digital systems, ensuring reliable operation.
- It provides **reset signals** during power-up, power-down, and brownout conditions.
- Includes a **watchdog timer** to detect µP lockups and trigger a reset if the µP fails to respond.
- Features **battery backup switching** to maintain system operation during power failures.
- Suitable for **5V, 3.3V, and mixed-voltage systems** due to its wide supply range.
### **Features:**
- **Power-Fail Comparator:** Monitors an auxiliary voltage for early warning of power loss.
- **Low-Power Operation:** Minimal current draw in backup mode.
- **Manual Reset Input:** Allows external push-button reset control.
- **Watchdog Timer:** Prevents system lockup by resetting µP if not toggled periodically.
- **Battery Backup Switchover:** Seamlessly switches to backup power when main supply fails.
- **Adjustable Reset Threshold:** Some variants allow customization of reset voltage levels.
This IC is commonly used in **embedded systems, industrial controls, automotive electronics, and battery-backed applications** requiring reliable power monitoring.
(Note: For exact electrical characteristics, refer to the official datasheet.)
