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MAX720CSE from MAXIM,MAXIM - Dallas Semiconductor

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MAX720CSE

Manufacturer: MAXIM, MAX

PALMTOP COMPUTER AND FLASH MEMORY POWER SUPPLY REGULATORS

Partnumber Manufacturer Quantity Availability
MAX720CSE MAXIM, MAX 79 In Stock

Description and Introduction

PALMTOP COMPUTER AND FLASH MEMORY POWER SUPPLY REGULATORS The MAX720CSE is a microprocessor (μP) supervisory circuit manufactured by Maxim Integrated (now part of Analog Devices). Below are its specifications, descriptions, and features based on factual information from Ic-phoenix technical data files:

### **Specifications:**
- **Manufacturer:** Maxim Integrated (now Analog Devices)  
- **Part Number:** MAX720CSE  
- **Package:** 16-pin SOIC (Small Outline Integrated Circuit)  
- **Operating Voltage Range:** 4.65V to 5.5V  
- **Reset Threshold Voltage:** Adjustable or fixed (depending on variant)  
- **Reset Timeout Period:** Typically 200ms (adjustable in some versions)  
- **Operating Temperature Range:** 0°C to +70°C (Commercial grade)  
- **Watchdog Timer:** Yes (programmable)  
- **Manual Reset Input:** Available  
- **Power-Fail Comparator:** Included (for early warning of power loss)  
- **Battery Backup Support:** Yes (for CMOS RAM backup)  

### **Descriptions:**
The MAX720CSE is a μP supervisory circuit designed to monitor power supply voltages and ensure proper system operation in microprocessor-based systems. It provides reset signals to the μP during power-up, power-down, or brownout conditions. The device includes a watchdog timer to detect software lockups and a power-fail comparator for early warning of power failure. It also supports battery backup switching for CMOS RAM.

### **Features:**
1. **Voltage Monitoring:** Monitors +5V supply for out-of-tolerance conditions.  
2. **Reset Generation:** Provides a reset signal to the μP when voltage drops below threshold.  
3. **Watchdog Timer:** Prevents system lockup by requiring periodic toggling.  
4. **Manual Reset Input:** Allows external push-button reset.  
5. **Power-Fail Comparator:** Early warning for impending power loss.  
6. **Battery Backup Switching:** Automatic switchover to backup battery for RAM.  
7. **Adjustable Reset Threshold:** Some variants allow customization.  
8. **Low Power Consumption:** Suitable for battery-backed applications.  

This information is based on the manufacturer's datasheet and technical documentation. For exact details, refer to the official datasheet from Analog Devices (formerly Maxim Integrated).

Application Scenarios & Design Considerations

PALMTOP COMPUTER AND FLASH MEMORY POWER SUPPLY REGULATORS

Alternative Part Number

  • LTC1144CS8 --: Pin-compatible charge pump voltage converter in SO-8 with similar inverting/regulating function; widely available and a common drop-in for MAX720 designs.
  • ICL7660CSA --: Classic CMOS charge pump voltage converter in SO-8 offering similar negative voltage conversion; well-established alternative with broad availability.
  • TC7660COA --: CMOS charge pump DC-to-DC converter in SO-8 with comparable voltage inversion performance; cost-effective and readily stocked alternative.
  • ICL7660SCPA --: Classic charge-pump voltage inverter offering comparable negative supply generation, available in DIP/SO packages and easy to adapt.
  • LTC1250CS8 --: Low-noise op amp in SO-8 with similar supply range and pinout, direct functional substitute for MAX720CSE.
  • OPA27GS --: Precision low-noise operational amplifier with comparable offset and drift specs, suitable replacement in most MAX720 circuits.
  • AD797ANZ --: Ultra-low-noise precision op amp offering similar or better performance, usable as a higher-grade drop-in alternative.

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