Problem with connection to SPI SRAM 23K256

[Darrel Taylor]

It looks like you are using a LAB-X1 development board.

Have you modified it for 3.6V?
That SRAM isn't going to work at 5V.
<br>

[hankshone]

It looks like you are using a LAB-X1 development board.

Have you modified it for 3.6V?
That SRAM isn't going to work at 5V.
<br>

Yes, I am using the LAB-X1 board for this test.
I provided a 3.3V power supply for the SRAM. But for the SI SO SCK pins I didn't modify them to 3.3V,just connect them directly to the SRAM's pins.

[Darrel Taylor]

I don't think the pins are 5V tolerent.
23K256 Datasheet shows max High-level input voltage (VIH) is VCC + 0.3
<br>

[hankshone]

I don't think the pins are 5V tolerent.
23K256 Datasheet shows max High-level input voltage (VIH) is VCC + 0.3
<br>

Thanks Darrel I will test separately and see if I could get it through

[Darrel Taylor]

Sounds like a good idea.

Use a different chip. That one may not work anymore.
<br>

[hankshone]

Sounds like a good idea.

Use a different chip. That one may not work anymore.
<br>

I tested on a separate circuit with a 3.0Voltage supply using PIC16LF877A and this Ram chip. There was some results come out, but not correct....
For example I wrote 100 into the first 100 location and the result come out to be 66 most of the time but some are 65. If I worte 0~100 accordingly in from address 0~100. The reads are some data from 0~66, it is also increasing accordingly, along with address shifting higher...it is weired..
I was wondering whether there is some error with my codes for these setups....

[mikebar]

Hi Hankshone,
I'm experiencing the same exact problem like yours: always reading 255
I'm using a 23LVC1025, 5 volt SRAM memory chip with 5 volt micro. But still the same problem like yours.
Did you found what the problem was?

Best regards,
Mike.