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SP705CU from SP

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SP705CU

Manufacturer: SP, SIPEX, MAXIM, SIPEX

Low Power Microprocessor Supervisory Circuits

Partnumber Manufacturer Quantity Availability
SP705CU SP, SIPEX, MAXIM, SIPEX 1919 In Stock

Description and Introduction

Low Power Microprocessor Supervisory Circuits The SP705CU is a microprocessor supervisory circuit manufactured by Maxim Integrated (now part of Analog Devices). Below are its key specifications, descriptions, and features based on factual information:  

### **Specifications:**  
- **Supply Voltage Range:** 1.8V to 5.5V  
- **Reset Threshold Accuracy:** ±1.5% (typical)  
- **Reset Timeout Period:** Adjustable (200ms min. with external capacitor)  
- **Manual Reset Input:** Active-low (MR) with internal pull-up  
- **Watchdog Timer:** Programmable (1.6s default)  
- **Operating Temperature Range:** -40°C to +85°C  
- **Package Options:** 8-pin SOIC, 8-pin µMAX  

### **Descriptions:**  
- The SP705CU monitors microprocessor power supplies, ensuring stable operation by generating a reset signal if the voltage falls below a preset threshold.  
- It includes a watchdog timer to detect software lock-ups and a manual reset input for user-initiated resets.  
- Designed for low-power applications, it operates over a wide voltage range, making it suitable for battery-powered and embedded systems.  

### **Features:**  
- Precision voltage monitoring with adjustable reset threshold  
- Low quiescent current (typically 35µA)  
- Push-button reset capability via **MR** pin  
- Watchdog timer with default or programmable timeout  
- Power-fail comparator for early warning of voltage drops  
- Immune to short voltage transients  

For exact details, refer to the official **Maxim Integrated datasheet (SP705CU)**.

Application Scenarios & Design Considerations

Low Power Microprocessor Supervisory Circuits

Alternative Part Number

  • MAX705CPA --: Pin-compatible microprocessor supervisor with the same reset and watchdog functions, widely available and a direct functional drop-in for the SP705.
  • ADM705AN --: Equivalent supervisory IC offering power-on reset, watchdog timer, and manual reset in the same DIP package, suitable as a second-source replacement.
  • TL7705ACP --: Supply voltage supervisor with reset output that can replace the SP705 in many reset-monitoring applications, though pinout should be verified before substitution.

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