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SN75157 - VOH(MAX) at 1mA load

Kawai
Guru 19785 points
Other Parts Discussed in Thread: SN75157

Hi Team,

Please allow me to ask you the spec for VOH(MAX) at 1mA load for SN75157.

Is there any test data or simulation data for this ?

Customer is considering to use this device. They need the VOH(MAX) information to see if they can interface to their device.

Best Regards,

Kawai

  • 0
    TI__Guru**** 164796 points

    Takushi-san,

    Typical is 3.5V which is more accurately stated as VCC - 1.5V.
    There is an expected +4mV/C temperature coefficient.

    Therefore typical VOH = VCC -1.5V + 4mV*(Tj -25C).
    Because this is based primarily on diode voltages, they won't change much.
    A cautious VOH maximum is VOH[max] = VCC - 1.5V + 4mV*(Tj -25C) + 60mV

    What is the VCC maximum and maximum output acceptable?

    [edits for polarity of 4mV]

  • 0 in reply to Ron Michallick
    Guru 19785 points

    Hello Ron-san,

    Thanks for your support and the calculation formula. I have answered this information to customer as a reference.
    Their Receiver device is a 3.3V device, so they are considering to divide the output voltage using resistor divider, R1/R2. (R1+R2=1.2k Ohm)

    By the way, I could not find Tj(MAX) in the datasheet. What is the Tj(MAX) specification ? Is it 150 degC ?

    Best Regards,
    Kawai