Products Mentioned

LTC2859 Production
The LTC2859 and LTC2861 are low power, 20Mbps RS485/422 transceivers operating on 5V supplies. The receiver includes a logic-selectable 120O termination...
Datasheet
LTC2859 on Analog.com

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LTC2859 Ro Logic

		            
		

			

									
					    Yuya
					
							


			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Oct 23, 2018 
				
			
			
		
    
		
     
				
		
    
		    		    
		    
		    	
			
    Hi,
    

    My customers are considering using LTC 2859.
    

    So I got a question.
    

    

    If A - B of LTC 2859 is 200 mV or more (225 mV or more with hysteresis added), Ro = H.
    When A - B is -200 mV or less (-225 mV or less with hysteresis added) Ro = L.
    

    Although I recognize it, What is Ro in the range of -175 mV to 175 mV (considering hysteresis 25 mV)?
    

    Best regards,
    

    Yuya
    
									
			        
		
    

				
						
        

    
    Tags: 
                                            
                 RS-232 / RS-422 / RS-485 / RS-562
                
                                                    
                 ltc2859
                
                                                    
                 RS-485 and RS-422
                
                                
            
    
    
    

		
    
			
						
									
												
			
			
                        
                                    
                        
                        
                        
            
			            
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    
















    
	
    
	
    
					



			








	
	
	
	



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      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Oct 23, 2018 5:41 AM
            
                                    
					
      
	
      

		
		
      
					
      Hi Yuya,
      

      The receiver input hysteresis band could vary between different units and over temperature within the -200mV to 200mV range. I think you are asking about the fail-safe feature of the product, the LTC2859 has a fail-safe that guarantees the receiver output to be in a logic HIGH state when the inputs are either shorted, left open, or terminated(externally or internally), but not driven for more than about 3us. You could refer to the Receiver and Failsafe section in the datasheet.
      

      Regards,
      

      Neil
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
				
						
						
				
				
		
		
      
			
		
      
	
      

      

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													0
							
			
				
									
							        
			
			
			
      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Oct 23, 2018 5:41 AM
            
                                    
					
      
	
      

		
		
      
					
      Hi Yuya,
      

      The receiver input hysteresis band could vary between different units and over temperature within the -200mV to 200mV range. I think you are asking about the fail-safe feature of the product, the LTC2859 has a fail-safe that guarantees the receiver output to be in a logic HIGH state when the inputs are either shorted, left open, or terminated(externally or internally), but not driven for more than about 3us. You could refer to the Receiver and Failsafe section in the datasheet.
      

      Regards,
      

      Neil
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
				
						
						
				
				
		
		
      
			
		
      
	
      

      

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