[AD7891]Data Access Time after Falling Edge of /RD (t9 max value)

Question

Hello, 
 The customer would like to know about timing spec of AD7891 for their host side design. 
 According to datasheet page 4, t9 min value is specified as 25ns. Do you have maximum time specification of t9? 
 How long the user should be wait to receive valid data output? (most shortest time is 25ns, how about most longest time?) 
 
 Thank you for your help as always. 
 Best regards, 
 Sofy

jcolao · Accepted Answer

Hi Sofy, 
 Apologies for the misunderstanding. Yes T9 is the amount of time to have a valid data after /RD falling edge and after T9 time the user can read data. The user can choose when to read the data after T9 time as long as the /RD and /CS is low and will be valid until 30ns(T10) after /RD goes high. 
 I would recommend to read data between 25ns after /RD goes low and before /RD goes high, as this is the time that the data are valid. 
 Regards, 
 Jonathan

Electronic Design Services - PartnerZone

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[AD7891]Data Access Time after Falling Edge of /RD (t9 max value)