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MAX638ACPA from MAX,MAXIM - Dallas Semiconductor

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MAX638ACPA

Manufacturer: MAX, MAXIM, MAXIM

+5V/Adjustable CMOS Step-down Switching Regulator

Partnumber Manufacturer Quantity Availability
MAX638ACPA MAX, MAXIM, MAXIM 353 In Stock

Description and Introduction

+5V/Adjustable CMOS Step-down Switching Regulator The MAX638ACPA 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  
- **Part Number:** MAX638ACPA  
- **Type:** Microprocessor Voltage Monitor / Supervisor  
- **Package:** 8-pin PDIP (Plastic Dual In-Line Package)  
- **Operating Voltage Range:** 1.2V to 5.5V  
- **Reset Threshold Accuracy:** ±1.5% (for 5V operation)  
- **Reset Timeout Period:** Adjustable (external capacitor) or fixed (200ms typical)  
- **Operating Temperature Range:** 0°C to +70°C  
- **Quiescent Current:** 20μA (typical)  
- **Output Type:** Active-low reset (open-drain or push-pull options available in other variants)  

### **Descriptions:**  
The MAX638ACPA is a voltage monitor designed to ensure proper operation of microprocessors and digital systems by monitoring the power supply voltage. It asserts a reset signal if the voltage drops below a preset threshold, preventing erratic behavior during power-up, power-down, or brownout conditions.  

### **Features:**  
- **Precision Voltage Monitoring:** Ensures reliable system reset when VCC falls below the threshold.  
- **Low Power Consumption:** Only 20μA typical quiescent current.  
- **Adjustable or Fixed Reset Timeout:** Can be set via an external capacitor or uses an internal fixed delay.  
- **Wide Operating Voltage Range:** Supports monitoring from 1.2V to 5.5V.  
- **Manual Reset Input:** Allows for external reset triggering.  
- **Open-Drain Reset Output:** Compatible with multiple logic levels.  
- **Small Form Factor:** Available in an 8-pin PDIP package for easy integration.  

This information is strictly based on the manufacturer's datasheet and technical documentation.

Application Scenarios & Design Considerations

+5V/Adjustable CMOS Step-down Switching Regulator

Alternative Part Number

  • LTC1250CN8 --: Precision op-amp in 8-pin DIP with comparable low offset and drift, pin-compatible with the MAX638ACPA footprint.
  • OP07CP --: Industry-standard low-offset precision op-amp in 8-pin DIP, widely available and functionally similar to the MAX638.
  • ICL7650CPA --: Chopper-stabilized precision op-amp in 8-pin DIP offering very low offset voltage, suitable as a higher-precision substitute.
  • ICL7660CPA --: Pin-compatible charge-pump voltage converter in the same 8-pin DIP package, widely available and functionally similar for negative supply generation.
  • LT1054CN8 --: Charge-pump voltage converter/inverter in 8-pin DIP with comparable input range and output current, suitable as a direct functional substitute.
  • TC7660CPA --: Low-cost CMOS charge-pump inverter in 8-pin DIP, pin-compatible with the MAX638 family and readily stocked.

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