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MAX638ACSA from MAX,MAXIM - Dallas Semiconductor

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MAX638ACSA

Manufacturer: MAX, MAXIM

+5V/Adjustable CMOS Step-down Switching Regulator

Partnumber Manufacturer Quantity Availability
MAX638ACSA MAX, MAXIM 102 In Stock

Description and Introduction

+5V/Adjustable CMOS Step-down Switching Regulator The MAX638ACSA is a microprocessor (μP) supervisory circuit manufactured by Maxim Integrated. Below are its key specifications, descriptions, and features:

### **Specifications:**
- **Manufacturer:** Maxim Integrated  
- **Type:** Microprocessor (μP) Supervisory Circuit  
- **Package:** 8-pin SOIC (Small Outline Integrated Circuit)  
- **Operating Voltage Range:** 1.2V to 5.5V  
- **Reset Threshold Options:** Adjustable or factory-set (e.g., 5V, 3.3V, 3V, etc.)  
- **Reset Timeout Period:** Typically 200ms (fixed or adjustable)  
- **Operating Temperature Range:** -40°C to +85°C  
- **Quiescent Current:** Low (typically a few microamps)  

### **Descriptions:**
- The MAX638ACSA monitors system voltage and generates a reset signal to the μP when the supply voltage falls below a preset threshold.  
- It ensures proper system operation by holding the μP in reset during power-up, power-down, or brownout conditions.  
- The device is designed for reliability in battery-powered or critical voltage-monitoring applications.  

### **Features:**
- **Low Power Consumption:** Ideal for battery-operated systems.  
- **Manual Reset Input:** Allows external push-button reset control.  
- **Precision Voltage Monitoring:** Ensures accurate reset triggering.  
- **Adjustable or Fixed Threshold:** Supports multiple voltage levels.  
- **Small Form Factor:** 8-pin SOIC package for space-constrained designs.  
- **Wide Operating Voltage Range:** Compatible with various power supplies.  

For exact reset threshold options and additional details, refer to the official datasheet from Maxim Integrated.

Application Scenarios & Design Considerations

+5V/Adjustable CMOS Step-down Switching Regulator

Alternative Part Number

  • LTC1235CS8 --: Pin-compatible supervisory/monitor IC with similar function and supply range, widely available as a direct substitute.
  • ADM809LARTZ --: Low-cost voltage supervisor in SOT-23 with comparable reset threshold and active-low output, suitable for the same monitoring role.
  • TL7705ACD --: Classic supply voltage supervisor with adjustable threshold and reset output, commonly used as a functional replacement in similar circuits.
  • LTC1235CSW --: Similar function and pinout in a comparable SOIC package; widely available and often used as a drop-in substitute for MAX638-series regulators.
  • ADM663AR --: Comparable voltage regulator/monitor function with similar electrical ratings; a common cross-reference from the same analog IC family.
  • ICL7665CSA --: Alternative supervisory/regulator IC with similar supply voltage range and SOIC package; usable when the MAX638 is unavailable.

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