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SN54LS490J from TI,Texas Instruments

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SN54LS490J

Manufacturer: TI

DUAL DECADE COUNTER

Partnumber Manufacturer Quantity Availability
SN54LS490J TI 200 In Stock

Description and Introduction

DUAL DECADE COUNTER The SN54LS490J is a dual decade counter manufactured by Texas Instruments. Below are its specifications, descriptions, and features based on factual information:

### **Manufacturer:**  
Texas Instruments  

### **Part Number:**  
SN54LS490J  

### **Description:**  
The SN54LS490J is a dual 4-bit decade counter from the 54LS series, designed for military and industrial applications. It consists of two independent counters, each capable of counting from 0 to 9 (decade counting).  

### **Key Features:**  
- **Logic Family:** LS (Low-Power Schottky)  
- **Number of Counters:** 2 (Dual)  
- **Counting Range:** 0 to 9 (per counter)  
- **Supply Voltage Range:** 4.5V to 5.5V  
- **Operating Temperature Range:** -55°C to +125°C (Military-grade)  
- **Package Type:** Ceramic DIP (Dual In-line Package)  
- **Output Type:** TTL-Compatible  
- **Reset Function:** Asynchronous master reset for clearing counters  
- **Clock Input:** Positive-edge triggered  

### **Applications:**  
- Frequency division  
- Digital counting systems  
- Industrial control systems  
- Military and aerospace electronics  

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

Application Scenarios & Design Considerations

DUAL DECADE COUNTER

Alternative Part Number

  • MC54LS490J --: Direct functional equivalent 4-bit decade counter in the same LS TTL family and ceramic DIP package, pin-compatible with the original.
  • DM54LS490J --: Pin-compatible LS TTL decade counter with identical logic function and military temperature range, suitable as a drop-in replacement.
  • 74LS490N --: Same LS TTL decade counter function in a plastic DIP package; electrically compatible for commercial-grade applications where the ceramic military package is not required.

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