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Question about SN75ALS192 and SN75ALS197

Satoshi
Guru 19645 points
Other Parts Discussed in Thread: SN75ALS192, SN75ALS197
Please let me know about three points below of SN75ALS192/297.
 
-----------------------------------
①G pin and /G pin
　Is these pin necessary or unnecessary Pull-up/Pull-down resister?
　If necessary, is there recommended pullu-up resister value?
②SN75ALS192 input
　Is below resister value (221Ω) no problem?

③SN75ALS197
　Which recommend on unused channel?
　・Input⇒GND/Output⇒Open
　・Input⇒GND/Output⇒GND  
 -----------------------------------
 
Best regards,
Satoshi
  • 0
    TI__Guru**** 164976 points
    Satoshi san,

    1) Connect G pin to valid TLL logic levels. Direct to ground or VCC is allowed.
    2) The resistor should match the cable impedance to prevent reflections on the line which will degrade the signal quality.
    3) For unused channels both inputs open and output open.