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LSF0204: Do you have any level shift device between 1.8V and 3.3V for eMMC standard?

Kazuya Nakai59
Guru 21875 points
Part Number: LSF0204
Other Parts Discussed in Thread: TXV0106, TXB0604, TXS0206A

Hello guys,

One of my customers is considering using LSF0204 as level shift device 
between 1.8V and 3.3V for HS200 mode (200Mbps) of eMMC standard.

Also they want to use 2 pcs of LSF0204 for D0~D3, CMD and CLK signals level shifting.

Can LSF0204 be used for these conditions?

Your reply would be much appreciated.

Best regards,
Kazuya.

 

  • 0
    TI__Mastermind 44991 points

    Hey Nakai-san,

    While 200Mbps is within the supported bandwidth of this device, it requires very strong external pullups and small output Cload to be achievable (due to its passive circuitry). If your application does not require direction change per channel, it is more suitable to use a fixed direction/ direction controlled translator here such as the TXV0106, AVC4T245 instead due to its architecture including CMOS buffering for increased driving capability.

    Regards,

    Jack

  • 0 in reply to Jack Guan
    Guru 21875 points

    Hello Jack,

    Thank you very much for your reply.

    Your answer about LSF0204 is very helpful for the customer and me.

    But eMMC doesn't have any direction signal. 

    Do you know any level shift device which have 200Mbps(or 100Mbps) capability with auto-direction control?

    Thank you again and best regards,
    Kazuya.  

  • 0 in reply to Kazuya Nakai59
    TI__Mastermind 44991 points

    Hi Nakai-san,

    AXC4T774 can be used here- it can support up to 380Mbps for 1.8V to 3.3V translation and uses a DIR pin every channel (total of 4 DIR pins). There is also the AXC4T245 that has 2 DIR pins that each control 2 channels if space is more constrained in your application.

    Regards,

    Jack

  • 0 in reply to Jack Guan
    Guru 21875 points

    Hi Jack,

    Thank you very much for your reply.

    Do you mean that TI doesn't have any level shift IC which have 200Mbps(or 100Mbps) capability with auto-direction control?

    Thank you again and best regards,
    Kazuya.

  • 0 in reply to Kazuya Nakai59
    TI__Mastermind 44991 points

    Hi Nakai-san,

    There is the TXB0604 that is an auto dir. translator that is capable of supporting this speed, however it will only be able to support push-pull drivers and not open drain compatible. As for design considerations with this device, please ensure Layout Section 10 of the datasheet is followed for optimal SI. 

    Regards,

    Jack

  • 0 in reply to Jack Guan
    Guru 21875 points

    Hi Jack,

    Thank you very much for your strong supports.

    The customer want to consider to use TXB0604.
    But this device status is preview.

    Do you know when this device RTM timing is?

    Thank you again and best regards,
    Kazuya.

  • 0 in reply to Kazuya Nakai59
    TI__Mastermind 44991 points

    Hi Nakai-san,

    Lets discuss further offline.

    Thanks,

    Jack

  • 0 in reply to Jack Guan
    Guru 21875 points

    Hi Jack,

    Thank you very much for your reply on the off line.

    Their application is a controller like PLC.
    They understood that TXB0604 can not be used for eMMC interface.

    Does TI not have any level shift IC which have 200Mbps(or 100Mbps) capability with auto-direction control except TXB0604?

    Thank you again and best regards,
    Kazuya.

  • 0 in reply to Kazuya Nakai59
    TI__Mastermind 44991 points

    Hi Nakai-san,

    There is also the TXS0206A that has designated push pull driver for the fixed direction CLK signal and open drain supported IOs:

    Regards,
    Jack