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Inquiry regarding undervoltage threshold on SN65HVDA1050A-Q1

Other Parts Discussed in Thread: SN65HVDA1050A-Q1

Hello, all 

Now we have some inquiries regarding undervoltage threshold on SN65HVDA1050A-Q1 from our customer.

Please refer to the items below, and feedback us with your comment. 

When referring RECOMMENDED OPERATING CONDITIONS on datasheet page 6, Vcc operating range is defined as 4.75 to 5.25V. 

Meanwhile, when referring ELECTRICAL CHARACTERISTICS on datasheet page 7, UVCC threshold is defined as 2.8 to 4V. 

Please let us clarify how this device could operate if 4V to 4.75V is supplied into VCC pin. 

Also, when referring "Undervoltage Lockout / Unpowered Device" on datasheet page 4, TXD pin is pulled up to VCC. However, we could not find out how RXD pin would be treated. 

Please let us clarify how RXD pin would be treated on this case. 

We thank you in advance for your information. 

Best regards, 

  • Hi There,

    If the SN65HVD1050A was operated, by design, at its minimum voltage rail the would be little to no head room on the undervoltage lockout spec (UVCC). If there is no head room any dip in supply voltage would force the device into a lockout condition which may not an ideal condition in all situations.

    From the "Equivalent Input and Output Schematic Diagrams" portion of the data sheet you can see the input and output structures in the device.