digital bus transceiver...

Discussion in 'Homework Help' started by dtvonly, Dec 18, 2013.

  1. dtvonly

    Thread Starter Member

    Dec 14, 2012
    the internal circuit schematic of any typical bus transceiver shows that input A is buffered to output B. My question is: if my Vcc is 5V and my input to A is 3.3V, will my output B be 5V? If not then is there an IC that does level translation to Vcc as well? thank you.
  2. shteii01

    AAC Fanatic!

    Feb 19, 2010
    Buffer does not alter input. 5 goes in, 5 comes out.

    Level translators exist. They are commonly called level shifter.
  3. MrChips


    Oct 2, 2009
    The input of a digital bus transceiver has low-to-high and high-to-low switching thresholds. Once those thresholds are met the output will switch according to the supply levels (i.e. between Vcc and GND.)

    Hence the 0-3.3V input will translate to GND to Vcc output, 0 to 5V in your case.

    The opposite is not necessarily true. If you are driving 0-5V input into a 3.3V device you have to make sure that the device is protected from the over voltage at the input.