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MAX3160E Production
The MAX3160E/MAX3161E/MAX3162E are programmable RS-232/RS-485/RS-422 multiprotocol transceivers. The MAX3160E/MAX3161E are pin programmable as a 2Tx/2Rx...
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MAX3160E on Analog.com

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MAX3160E FAST-MODE pin termination

		
	
				

			

									
					    AndrewKuh
					
							

            
            			
				
									
											
			
			
				
			
			
			    	
			                    
                
				                on Jun 18, 2024 
				
			
			
		

		
		                    	    

        	    
Thread Summary

                The user asked if 'unasserted' for the FAST pin on the MAX3160E means floating. The engineer confirmed that 'unasserted' means the pin is connected to ground (GND), and 'asserted' means it is connected to VCC. The FAST pin has no internal pull-up or pull-down and must be explicitly connected to enable or disable fast mode.
                        	    

                
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Category: Datasheet/Specs

    		        		            		    
Product Number:  MAX3160E 

    		        		    		    

		    		    
		    			

			    
The MAX3160E FAST-MODE operation describes the pin as asserted or unasserted.  In this context is unasserted the same as GND / De-assertion?  I am reviewing schematics where they left this pin floating and I want to confirm the terminology unasserted doesn't mean floating here.  I see no mention of internal pull-up/down termination on this pin.  I am assuming this pin needs to be pulled to ground or VCC.  

			

			
									
		                             
                        

    

                                            
                 interface and isolation
                
                                                    
                 Datasheet/Specs
                
                                                    
                 RS-232 / RS-422 / RS-485 / RS-562
                
                                                    
                 MAX3160E
                
                                                    
                 interface
                
                                        
                                            
                
                
                                
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                on Jun 18, 2024 10:35 AM
            
            
						
			            		
    
		
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    Quoted portion of datasheet
    

    "Fast-Mode Operation The FAST control input is used to select the slew-rate limiting of the RS-232 transmitters and the RS-485/ RS-422 drivers. With FAST unasserted, the RS-232 transmitters and the RS-485/RS-422 driver are slew-rate limited to reduce EMI. RS-232 data rates up to 1Mbps and RS-485/RS-422 data rates up to 10Mbps are possible when FAST is asserted. FAST can be changed during operation without interrupting data communications."
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

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    •  Analog Employees  
    
            
						
                            
            
            				
            
                on Jun 18, 2024 1:33 PM
            
            
						
			            		
    
		
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    Hello,
    

    Thank you for your question!
    

    You are correct - FAST is asserted when connected high (> 2.4V) and unasserted when connected low (<0.8V).  So, yes, it would be considered as unasserted when connected to ground.
    

    There is no internal pull-up or pull-down on the FAST pin. You are correct that the pin needs to be connected high (VCC) or low (GND) to enable/disable fast mode.
    

    Best,
    

    Shasta
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
				
						
						
				
				
		
		
    
			
		
    
	
    

    

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