How to build connection between microcontroller and 74HC4050

[redsuns]

I need to get the 74HC4050 to shift the voltage from 5v to 3.3v for the sd card
the SDO , SS and SCK of microcontroller is connected to 74HC4050 input and output to SD card,
but how is the SDI connected, should the uC SDI connected to the input or output of the 74HC4050?

 

[Wade Hassler]

I need to get the 74HC4050 to shift the voltage from 5v to 3.3v for the sd card
the SDO , SS and SCK of microcontroller is connected to 74HC4050 input and output to SD card,
but how is the SDI connected, should the uC SDI connected to the input or output of the 74HC4050?

No. The HC4050 is a 'high-to-low' translator and you need a "low-to-high" on that pin.
Here's a slightly-overkill example:
https://www.nxp.com/documents/data_sheet/74LVC_LVCH1T45.pdf

However, there is a chance that the SD-card's output level is high enough to qualify as a 'high' to the microcontroller.
You have some data-sheet reading to do.

 

[upand_at_them]

I just used a simple voltage divider for SD card interfacing.