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SN75ALS1177: Does the SN75ALS1177 or the SN75ALS1178 include two transceivers?

Part Number: SN75ALS1177
Other Parts Discussed in Thread: SN75ALS1178,

HI Sir:

I want to confirm the below question

Does the SN75ALS1177 or the SN75ALS1178 include two transceivers and they compatible with RS422??

Thanks

Best Regards

  • Hi Pohua,

    Both devices contain 2 full duplex RS-422 compliant transceivers.

    The difference is that SN75ALS1177 has 1 Drive enable (active high) and 1 receive enable (active low) that control both transceivers.

    The SN75ALS1178 however includes 2 Drive Enable Pins (active high) and the receivers are always enabled - i.e. they have no control pin.

    So either option is possible for you requirement - but they do differ in terms of control scheme. 

    Please let me know if you have any other questions!

    Best,

    Parker Dodson