What happened to Lyontek LY68L6400 PSRAM?

[TimCambridge]

Once widely available, particularly for various ESP project, it seems to have disappeared from LCSC. Did demand dry up, someone go after them for a patent violation,  Covid kill them, merge with someone else, ...

It was useful for a few MB of buffer at medium speed with a simple interface.

Thanks

[Benta]

PSRAM normally only has a lifetime of a couple of years, then it's replaced by SRAM.
Plenty of 64 Mb SPI SRAMs out there:
https://www.issi.com/US/product-serial-sram-and-serial-ram.shtml

[PCB.Wiz]

PSRAM normally only has a lifetime of a couple of years, then it's replaced by SRAM.
Plenty of 64 Mb SPI SRAMs out there:
https://www.issi.com/US/product-serial-sram-and-serial-ram.shtml

?
Their data sheet says

The IS66/67WVS8M8FALL/BLL are integrated memory device containing 64Mb Pseudo Static Random Access Memory using a self-refresh DRAM array organized as 8M words by 8 bits.

and 'plenty' will be true in the future ?  Not sampling until Q4 2023


64M   IS66WVS8M8FALL,IS67WVS8M8FBLL      x1, x4   2.7~3.6V   104 MHz   -40 to 105°C   SOIC8   S=Q4/2023       Serial RAM

[Benta]

So?
I'm neither PartMiner nor findchips. My link may have been suboptimal, admitted, ISSI ain't bleeding edge.

I just pointed out why PSRAM has a short lifetime.

Now it's your turn to provide something constructive, if you can.

[PCB.Wiz]

Now it's your turn to provide something constructive, if you can.

I already did exactly that 
Live and factual device information from the web and data, for other readers.

[dmendesf]

Plenty of clones:

https://www.adafruit.com/product/4677

[dmendesf]

My mistake, it's just another PSRAM...

This one is true SRAM (no refresh pauses) but more expensive:

https://www.lcsc.com/mobile/product-detail/SRAM_Vilsion-Tech-VTI7064MSME_C139966.html

[PCB.Wiz]

This one is true SRAM (no refresh pauses) but more expensive:

https://www.lcsc.com/mobile/product-detail/SRAM_Vilsion-Tech-VTI7064MSME_C139966.html

Interesting part.
Are you sure that is true SRAM ? It has a strange CE# limitation, seen on the PSRAM parts.

tCEM CE# low pulse width < 4 μs

[DavidAlfa]

It's a normal psram, just a terribly low detailed datasheet.

4.6 Command termination
All All Reads & Writes must be completed by CE# LOW to HIGH.
This CK# rising edge is the trigger to terminate the activated wordline for the read/write and set the device into standby.
Not doing so will block internal refresh operations until the device sees the read/write wordline terminated.

[aeg]

Another equivalent is APS6404L available from Mouser.

Interestingly, the Lyontek website still lists LY68L6400 as mass production.

[peter-h]

And aliexpress is selling some counterfeits (which also don't work)...

PSRAM normally only has a lifetime of a couple of years, then it's replaced by SRAM

You probably won't get an 8 megabyte SRAM for $1 (small qty) Actually I do not believe any such device exists... just spent an hour digging around. There are only PSRAMs e.g.
APS6404L-3SQN QSPI PSRAM
which you can get from Mouser, and the price is similar to the LY68 part (which seems to come only from Aliexpress nowadays). On a quick look it looks identical and even the device ID (0x0d 0x5d) is the same!