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Thread: MK20DX128VLH5 vs. MK20DX256VLH7 drop in replacement?

  1. #1

    MK20DX128VLH5 vs. MK20DX256VLH7 drop in replacement?

    Hi all,

    Producing my own circuits using the MK20DX128VLH5 with Pauls Mini54 bootloader, and looking forward to switching over to the new MK20DX256VLH7 once they come in stock (MCU behind the Teensy 3.1). Looking at the datasheet, it looks like the VLH7 is a pin for pin replacement with no circuit board modifications needed (assuming I'm not adding any functionality wrt additional IO pins). Can anyone confirm that there are no physical changes that would require a hardware design modification? The additional RAM in particular is looking to be a godsend for my usage.


    Thanks in advance.

  2. #2
    Senior Member PaulStoffregen's Avatar
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    Yes, it's pin compatible. The only changes are some pins gain new functions.

    The Mini54 we're shipping now will auto-detect the chip and implement either Teensy 3.0 or 3.1.

  3. #3
    Senior Member PaulStoffregen's Avatar
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    Mouser has the chip in stock, by the way, so no need to wait on Digikey.

    Edit: ignore the wrong specs on Mouser's website. This chip really does have 64K of RAM.

  4. #4
    Great news! Thank you Paul. Looking forward to the upgrade.

    I'll make a post once I receive my boards and have time to run some preliminary and rough power consumption tests.

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