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MAX640CSA from MAX,MAXIM - Dallas Semiconductor

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MAX640CSA

Manufacturer: MAX, MAXIM

5V/3.3V/3V/Adjustable, High-Efficiency, Low IQ, Step-Down DC-DC Converters

Partnumber Manufacturer Quantity Availability
MAX640CSA MAX, MAXIM 189 In Stock

Description and Introduction

5V/3.3V/3V/Adjustable, High-Efficiency, Low IQ, Step-Down DC-DC Converters The MAX640CSA is a microprocessor (μP) supervisory circuit manufactured by Maxim Integrated. Below are its key specifications, descriptions, and features:

### **Specifications:**
- **Manufacturer:** Maxim Integrated  
- **Part Number:** MAX640CSA  
- **Package:** 8-pin SOIC (Small Outline Integrated Circuit)  
- **Operating Voltage Range:** 1.2V to 5.5V  
- **Reset Threshold Options:** Adjustable or fixed (factory-set)  
- **Reset Timeout Period:** 140ms (typical)  
- **Operating Temperature Range:** 0°C to +70°C (Commercial)  
- **Quiescent Current:** 5μA (typical)  
- **Output Type:** Active-low reset signal (RESET)  

### **Descriptions:**
The MAX640CSA is a low-power μP supervisory circuit designed to monitor system voltage and provide a reset signal to the microprocessor if the supply voltage drops below a preset threshold. It ensures reliable system operation by preventing erratic behavior during power-up, power-down, or brownout conditions.  

### **Features:**
- **Low Power Consumption:** Operates with minimal current draw (5μA typical).  
- **Adjustable or Fixed Threshold:** Supports factory-set or user-adjustable reset thresholds.  
- **Manual Reset Input:** Allows for external pushbutton reset control.  
- **Power-Fail Comparator:** Provides early warning of impending power failure.  
- **Wide Operating Voltage Range:** Functions from 1.2V to 5.5V.  
- **Guaranteed Reset Valid Down to VCC = 1V:** Ensures reliable reset assertion even at very low voltages.  

This device is commonly used in embedded systems, battery-powered applications, and critical digital circuits requiring stable power monitoring.  

(Note: Always refer to the official datasheet for detailed specifications and application guidelines.)

Application Scenarios & Design Considerations

5V/3.3V/3V/Adjustable, High-Efficiency, Low IQ, Step-Down DC-DC Converters

Alternative Part Number

  • LTC1734CS8 --: Pin-compatible step-down regulator in the same SO-8 package with comparable input voltage and current ratings, from a different series and vendor.
  • LM2594M-5.0 --: Widely available buck regulator with similar voltage/current capability and SO-8 footprint, offering a distinct naming series as a functional substitute.
  • MC34063ACD --: Versatile DC-DC converter IC that can be configured to match the original regulator's function, in an SOIC package, from a different manufacturer and series.
  • LTC1735CS8 --: Pin-compatible step-down switching regulator controller with similar input voltage range and current-mode architecture, widely used as a MAX640 substitute in buck converter designs.
  • LM2596S-5.0 --: Simple 5V fixed-output buck regulator in TO-263 package, easy drop-in for many MAX640 buck applications with integrated switch and similar current capability.

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