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LSF0204D：Questions about the contents of the data sheet

user6234799
Prodigy 20 points
Part Number: LSF0204D
Other Parts Discussed in Thread: LSF0204

I have a question regarding the contents of the datasheet.

I don't know what the state of the device will be by controlling EN H and L.please tell me.

P.3(Description (continued)). There is an explanation of the following sentences.

"When EN is HIGH, the translator switch is on, and the An I/O is connected to the Bn I/O, respectively, allowing bidirectional data flow between ports. When EN is LOW, the translator switch is off, and a high-impedance state exists between ports. "

Is this sentence consistent with the table below (Device Comparison Table)?

And, Table 1 (P11) shows the following contents.

EN=H⇒An=Bn

EN=L⇒Hi-Z

Which explanation is correct?

Best Regards,

  • 0
    TI__Genius 16735 points

    Hi,

    I think all your explanations are saying the same thing. This device has an Active high Enable pin. Which means when the enable pin has "high" on the input, it becomes active for translation. When the enable pin is low, the outputs of the device become high-Z. 

    Here is a series on the operation of the LSF that I recommend you view. It is very short and will answer any questions you might have about the part.

    https://training.ti.com/introduction-voltage-level-translation-lsf-family?context=1134826-1139264-1134789

    Thanks!

    -Karan

  • 0 in reply to Karan Kotadia
    Prodigy 20 points

    Thank you for your reply.

    I understand that the LSF0204D is  has an Active high Enable pin.

    However, does the table below show the opposite?

    This table shows for LSF0204"D",

    EN=H：Hi-Z 

    EN=L：input or output

    I think it is contradictory.

    Best Regards,

  • 0 in reply to user6234799
    Guru 317360 points

    On the LSF0204, the EN input is active high, i.e., high = enabled, low = disabled.
    On the LSF0204D, the EN input is active low, i.e., low = enabled, high = disabled.

    The device comparison table is correct.

    The same datasheet is used for both devices, and most of the text was written before the LSF0204D was introduced. If some description mentions the EN pin but not the difference between the LSF0204 and the LSF0204D, then you can assume that it applies only to the LSF0204, and that the LSF0204D uses the opposite polarity.