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ADM485 Production
The ADM485 is a differential line transceiver suitable for high speed bidirectional data communication on multipoint bus transmission lines. It is designed...
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ADM485 on Analog.com

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Resistance between A and B with Vcc not applied

		
	
				

			

									
					    yoichi_mac
					
							

            
            			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Jun 21, 2023 
				
			
			
		
    
		
		                    	    
    
        	    
    Thread Summary
    
                The user inquired about the resistance value between pins A and B of the ADM485 when VCC is not applied. The final answer indicates that the A/B lines should be high-Z, at least 10kΩ, but this can vary if voltage is applied to the port. A clarification noted that the resistance is 12kΩ when no VCC is present.
                        	    
    
                
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    Category: Datasheet/Specs
    
    		        		            		    
    Product Number:  ADM485 
    
    		        		    		    
    
		    		    
		    			
    
			    
    Hi support team
    

    Regarding ADM485, what is the resistance value between pins A and B when VCC is not applied?
    Is it 2kΩ ,or  is it a high resistance?
    If it is high-Z , what is the actual resistance value?
    

    Best regards,
    
			
    
			
									
		                             
                        

    
    
                                            
                 Datasheet/Specs
                
                                                    
                 RS-232 / RS-422 / RS-485 / RS-562
                
                                                    
                 adm485
                
                                                    
                 interface
                
                                                    
                 RS-485 and RS-422