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MAX705 from MAXIM,MAXIM - Dallas Semiconductor

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MAX705

Manufacturer: MAXIM, MAX

Low-Cost, µP Supervisory Circuits

Partnumber Manufacturer Quantity Availability
MAX705 MAXIM, MAX 5123 In Stock

Description and Introduction

Low-Cost, µP Supervisory Circuits The MAX705 is a microprocessor (μP) supervisory circuit manufactured by Maxim Integrated (now part of Analog Devices). Below are its key specifications, descriptions, and features:

### **Specifications:**
- **Supply Voltage Range:** 1.2V to 5.5V  
- **Reset Threshold Options:** 2.63V, 2.93V, 3.08V, 4.38V, 4.63V  
- **Reset Timeout Period:** 140ms (min), 280ms (typ)  
- **Operating Temperature Range:** -40°C to +85°C  
- **Quiescent Current:** 35μA (typ)  
- **Package Options:** 3-Pin SOT23, 4-Pin SOT143  

### **Descriptions:**
- The MAX705 monitors the power supply voltage of a microprocessor and asserts a reset signal if the voltage drops below a preset threshold.  
- It ensures proper system operation by holding the reset signal active for a fixed period after power-up or when the supply voltage recovers.  
- The device is designed for low-power applications and provides reliable reset functionality for microcontrollers, DSPs, and other digital systems.  

### **Features:**
- **Precision Voltage Monitoring:** Ensures accurate reset assertion at the selected threshold.  
- **Low Quiescent Current:** Ideal for battery-powered applications.  
- **Manual Reset Input (MR):** Allows external pushbutton reset control (available in 4-pin version).  
- **Power-On Reset (POR) Delay:** Guarantees stable operation after power-up.  
- **Small Form Factor:** Available in compact SOT packages for space-constrained designs.  

The MAX705 is commonly used in embedded systems, industrial controls, and portable electronics requiring reliable power monitoring.

Application Scenarios & Design Considerations

Low-Cost, µP Supervisory Circuits

Alternative Part Number

  • ADM705ANZ --: Pin-compatible microprocessor supervisor with the same reset and watchdog functions, widely available and a direct functional drop-in.
  • TL7705ACP --: Classic 5V supply voltage supervisor with reset output, similar function and common in the same applications, though pinout differs.
  • MC33064P-5 --: Undervoltage sensing circuit providing reset for 5V systems, a low-cost functional alternative when exact pin compatibility is not required.
  • ADM705 --: Pin-compatible microprocessor supervisory circuit with the same reset and watchdog functions, widely available and a direct functional drop-in.
  • TL7705A --: Classic 5V supply voltage supervisor with reset output, similar supervisory role and easy to source as a lower-cost alternative.
  • MC33064 --: Undervoltage sensing circuit providing reset-like output for 5V systems, suitable when only basic supply monitoring is required.

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