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SN74LS249N

Manufacturer: TI

BCD-TO-SEVEN-SEGMENT DECODERS/DRIVERS

Partnumber Manufacturer Quantity Availability
SN74LS249N TI 26 In Stock

Description and Introduction

BCD-TO-SEVEN-SEGMENT DECODERS/DRIVERS The SN74LS249N is a BCD-to-7-segment decoder/driver with open-collector outputs, manufactured by Texas Instruments.  

### **Specifications:**  
- **Logic Family:** LS (Low-Power Schottky)  
- **Function:** BCD-to-7-Segment Decoder/Driver  
- **Output Type:** Open-Collector  
- **Supply Voltage (VCC):** 4.75V to 5.25V  
- **Operating Temperature Range:** 0°C to 70°C  
- **Package Type:** PDIP (Plastic Dual In-Line Package)  
- **Pin Count:** 16  
- **Current Rating (Output):** 24mA (sink)  
- **Propagation Delay:** Typically 30ns  

### **Descriptions:**  
The SN74LS249N converts a 4-bit Binary-Coded Decimal (BCD) input into a 7-segment display output. It is designed to drive common-anode LED or incandescent displays. The open-collector outputs allow for flexibility in interfacing with different display types.  

### **Features:**  
- **Lamp Test Input:** Allows all segments to be illuminated for testing.  
- **Ripple Blanking Input/Output:** Used for blanking leading/trailing zeros in multi-digit displays.  
- **Open-Collector Outputs:** Enable driving higher voltages than VCC.  
- **Low Power Consumption:** Typical power dissipation of 45mW.  
- **High Noise Immunity:** Schottky-clamped inputs for improved noise rejection.  

This information is based on the manufacturer's datasheet.

Application Scenarios & Design Considerations

BCD-TO-SEVEN-SEGMENT DECODERS/DRIVERS

Alternative Part Number

  • DM74LS249N --: Same 74LS249 BCD-to-seven-segment decoder function in a DIP-16 package, pin-compatible and directly interchangeable.
  • MC74LS249N --: Equivalent LS-series BCD-to-seven-segment decoder/driver with identical pinout and logic, suitable as a drop-in replacement.
  • SN74LS247N --: Similar 74LS BCD-to-seven-segment decoder/driver in DIP-16; differs in output configuration (active-low/open-collector style) so verify display drive requirements before use.
  • SN7447AN --: Similar BCD-to-seven-segment decoder/driver in DIP-16; note it uses active-low outputs and open-collector drive, so verify output polarity and blanking behavior before substitution.

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