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Original question:

SN65HVD23 bus termination control

TS12A4514: Is there a mistake in datasheet?

Alice
Prodigy 400 points
Part Number: TS12A4514
Other Parts Discussed in Thread: TS12A4515

Hi teams,

   Good day!

   My customer use the TS12A4514/TS12A4515 , and there is confusion about the IN pin logic voltage.

  Regarding the "Electrical Characteristics for 12-V Supply " in datasheet,  Vin for " Digital Control Input (IN) " pin should be 5V ~ V+.
  But "Logic-Level Thresholds" on page 7 showed that "when V+ reaches 12 V, the level threshold is about 3 V".
  Is there a mistake in our understanding? When V+ is 12v, what is the at least input voltage for high logic?
  Datasheet: https://www.ti.com/lit/ds/symlink/ts12a4514.pdf?ts=1656659260715&ref_url=https%253A%252F%252Fwww.ti.com%252Fproduct%252FTS12A4514

Best Regards
Miao Bai

  • 0
    TI__Expert 3515 points

    Hi Miao,

    The "Electrical Characteristics for 12V supply" table is correct, the logic threshold for VIH is 5V when V+ is 12V. The "Logic-Level Thresholds" on page 7 is saying that when V+ is at 12V, the threshold is now roughly 3V above the TTL (Transistor-Transistor Logic) interface standard logic threshold of 2.8V since it is now 5V. The datasheet is attempting to highlight a concern that designers should keep in mind if they use the TS12A4514/15 in a system designed around TTL interface. It is not conflicting with the "Electrical Characteristics for 12V supply" table.

    Thanks,
    Tyler

  • 0 in reply to Tyler McGuire
    TI__Prodigy 400 points

    Hi Tyler，

        Thanks for your clarifying. 

    Best regards,

    Miao Bai