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SN74LS123DR2 from TI,Texas Instruments

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SN74LS123DR2

Manufacturer: TI, MOT

RE Trigger Monostable Multivibrator

Partnumber Manufacturer Quantity Availability
SN74LS123DR2 TI, MOT 9308 In Stock

Description and Introduction

RE Trigger Monostable Multivibrator The SN74LS123DR2 is a dual retriggerable monostable multivibrator manufactured by Texas Instruments (TI).  

### **Specifications:**  
- **Supply Voltage (VCC):** 4.75V to 5.25V  
- **Operating Temperature Range:** 0°C to 70°C  
- **Propagation Delay Time (Typical):** 45 ns  
- **Output Current (High/Low):** -0.4 mA / 8 mA  
- **Package Type:** SOIC-16  
- **Logic Family:** LS (Low-Power Schottky)  

### **Descriptions:**  
- The SN74LS123DR2 features two independent retriggerable monostable multivibrators.  
- Each multivibrator can be triggered by either a positive or negative edge.  
- The output pulse width is determined by external timing components (resistor and capacitor).  
- It includes a clear function to terminate the output pulse prematurely.  

### **Features:**  
- **Dual Monostable Multivibrators:** Two independent circuits in one package.  
- **Retriggerable:** Allows pulse width extension with additional trigger inputs.  
- **Wide Pulse Width Control:** Adjustable via external RC components.  
- **Schottky-Clamped Inputs:** Ensures fast switching and noise immunity.  
- **Direct Clear Input:** Terminates output pulse when activated.  

This device is commonly used in timing, pulse generation, and delay applications.

Application Scenarios & Design Considerations

RE Trigger Monostable Multivibrator

Alternative Part Number

  • MC74LS123DR2G --: Direct functional equivalent dual retriggerable monostable multivibrator in the same LS logic family, available in SOIC-16 and widely stocked as a drop-in replacement.
  • SN74LS123N --: Same TI LS123 die in a PDIP-16 package, useful when board space allows through-hole mounting and identical timing behavior is required.
  • CD74HC123E --: High-speed CMOS dual retriggerable monostable with similar pinout and function; lower power consumption but check supply voltage and timing RC compatibility.
  • DM74LS123N --: Same 74LS123 dual retriggerable monostable multivibrator function with compatible logic thresholds and timing, widely available from a different manufacturer and series prefix.
  • MC74LS123N --: Direct functional equivalent of the 74LS123 monostable multivibrator, same LS TTL family and pinout, from a different naming series.

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