5Vmicro & 3Vmemory interface

[anan1975]

Dear All,

Please suggest hw I can interface a 5V micro with 3V SPI memory.

Thanks,

Anand

 

[blueroomelectronics]

Level shifter, the 74HCT125 is popular.

 

[segmex]

level convertor ; just two resistors 1.8k & 4.7k

 

[blueroomelectronics]

Resistors alone can't boost a 3.3V output to Schmidt trigger TTL levels (often found on SPI hardware)

 

[anan1975]

Dear sir,
74hct is only a three stage buffer how it can change level,
and in resistor voltage divider only 5 v can be converted to 3v but 3v from spi cant be boosted for micro to a 5 v.
Regards
anand

 

[blueroomelectronics]

I've used them in prototype projects, they work great.
**broken link removed**

 

[hindawi]

yuo can get good ic from bad hadr disk : tle 4417
https://pdf1.alldatasheet.com/datasheet-pdf/view/153294/INFINEON/TLE4418G.html

 

[anan1975]

tl 4418g is a triple voltage regulator it cant be interface in clock and data interface

 

[wp100]

Hi ,

These bi directional translator chips from TI or Analog Devices come in 4 and 8 bit versions, designed to converting voltages and data direction is automatically sensed.

They are reasonably cheap if you can find them in your area, smd only though.

 

[helios31]

And why not use directly a processor powered with 3V, if choice not fixed ?
For example, with Microchip, consider PIC24 and PIC32 rather than PIC16 or PIC18, they are at similar prices, but give more !

 

[danielciurea]

You can use pic 18LFxxx supplied from 3.3v. In this way you won't have to modify the software (ifalready existing), you only have to check the other i/o pins for correct operations