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LT2620 Digital Input Levels



		

			

									
					    dimo19
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on May 18, 2021 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    Hello,
    

    I would like to supply the LTC2620 with a VCC= 3.3Volt.
    

    What is the the "Digital Input High Voltage" value for VCC=3.3Volt? Is it 2.0 Volt or 2.4Volt?
    

    It is not very clear from the datasheet (table on pg.4), because the two given conditions are overlapping.
    

    

    Thanks.
    

    Best Regards
    

    D
    
										

    
				 
    
[edited by: dimo19 at 4:44 PM (GMT -4) on 18 May 2021]
				
    
					
    

				
				
		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    


	















    
	
    
	
    
					



			








	
	
	
	



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      •  Analog Employees  
      
            
			                            
                        
                on May 18, 2021 9:36 PM
            
            
					
      
	
      

		
		
      
					
      Not a typo, but it could be clearer. For VIH: 2.0V will be considered ‘H’ if Vcc<=3.6V. If Vcc > 3.6V, you’ll have to use a logic high of at least 2.4V. I think we were trying to show that 2.4V would be acceptable for any Vcc, but should have made the upper condition ‘3.6V to 5.5V’ to avoid confusion.
      

       
      

      VIL is similar: “0.6V logic low is acceptable for any Vcc”. Probably that 2nd condition for VIL would be clearer as ‘Vcc = 2.5V to 4.5V’ rather than 2.5V to 5.5V.
      

      
			
      

		
		
		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
						
						
				
				
		
		
      
			
		
      
	
      

      

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													+1
							
			
				
									
							        
			
			
			
      •  Analog Employees  
      
            
			                            
                        
                on May 18, 2021 9:36 PM
            
            
					
      
	
      

		
		
      
					
      Not a typo, but it could be clearer. For VIH: 2.0V will be considered ‘H’ if Vcc<=3.6V. If Vcc > 3.6V, you’ll have to use a logic high of at least 2.4V. I think we were trying to show that 2.4V would be acceptable for any Vcc, but should have made the upper condition ‘3.6V to 5.5V’ to avoid confusion.
      

       
      

      VIL is similar: “0.6V logic low is acceptable for any Vcc”. Probably that 2nd condition for VIL would be clearer as ‘Vcc = 2.5V to 4.5V’ rather than 2.5V to 5.5V.
      

      
			
      

		
		
		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
						
						
				
				
		
		
      
			
		
      
	
      

      

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