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TS5A23157: TS5A23157 VIH spec question and application issue

Dane Zhang
Expert 3460 points
Part Number: TS5A23157

Hi team,

#1.TS5A2315RSER Device datasheet 6.5 Electrical Characteristics: for 5-V Supply It is mentioned that -40-125℃, VIH=3.1V

so in the condition: VCC=5.0V, VIN1&IN2=3.3V, can it meet the spec of vin_min? If it can be met, vin min is in accordance with 3.1V as stated in datasheet?

#2.A problem about the abnormal switch of TS5A23157HRSER was found on the project. The test data is as follows:

 

normal

abnormal

Power-on state pin voltage

<0.01V

0.054V

Pin impedance in power-off state

infinity

2MΩ

do you have some advice on what experiment needed to find the cause?

  • 0
    TI__Mastermind 43436 points

    Hi Dane,

    1. The VIH is 0.7 * VCC for and at 5V that is 3.5V minimum for a logic high for the TS5A23157. A voltage signal of 3.3V will not guarantee proper operation - this must be at least 3.5V.

    2. What pin was this measured at - I am not sure if this is an abnormal condition because I am not sure what pin is being measured. If you provide more details on this so I can give you better guidance I would appreciate it!

    Best,

    Parker Dodson

  • 0 in reply to Parker Dodson
    TI__Expert 3460 points

    Hi Parker,

    I've sent you the issue detail by email.

    besides, could you help to confirm:

    Specifically, in the range of 4.75 to 5.25V, -40~125 degrees, the datasheet gives the specific value, 3.1V. so can 3.3V meet this min spec in this condition.

  • 0 in reply to Dane Zhang
    TI__Mastermind 43436 points

    Hi Dane,

    This spec is specifically saying that when using at extended temperature operation the minimum VIH could be 3.1V - however if using in the full temp range (-40C to 85C) the min VIH is V+ * 0.7 = VIH_min = 3.5V (for V+ = 5V). However when temperature exceeds 85C value the VIH_min can dip below the 3.5V range - I'd recommend that you adhere to the V+ * 0.7 to ensure proper operation.

    - Also thank you for providing further details over email I am looking into them now.

    Best,

    Parker Dodson

    Parker Dodson