What happened to Lyontek LY68L6400 PSRAM? - Page 1
Forum section: electronics / projects

author: TimCambridge
author_rank: Regular Contributor
timestamp: September 13, 2023, 09:00:03 pm
content: 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

author: Benta
author_rank: Super Contributor
timestamp: September 13, 2023, 09:44:15 pm
content: 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

author: PCB.Wiz
author_rank: Super Contributor
timestamp: September 13, 2023, 11:25:13 pm
content: Quote from: Benta on September 13, 2023, 09:44:15 pm?Their data sheet saysThe 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 202364M IS66WVS8M8FALL,IS67WVS8M8FBLL x1, x4 2.7~3.6V 104 MHz -40 to 105°C SOIC8S=Q4/2023Serial RAM

author: Benta
author_rank: Super Contributor
timestamp: September 13, 2023, 11:39:57 pm
content: 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.

author: PCB.Wiz
author_rank: Super Contributor
timestamp: September 14, 2023, 12:51:31 am
content: Quote from: Benta on September 13, 2023, 11:39:57 pmI already did exactly thatLive and factual device information from the web and data, for other readers.

author: dmendesf
author_rank: Frequent Contributor
timestamp: September 14, 2023, 02:57:54 am
content: Plenty of clones:https://www.adafruit.com/product/4677

author: dmendesf
author_rank: Frequent Contributor
timestamp: September 14, 2023, 03:12:09 am
content: 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

author: PCB.Wiz
author_rank: Super Contributor
timestamp: September 14, 2023, 03:27:01 am
content: Quote from: dmendesf on September 14, 2023, 03:12:09 amInteresting 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

author: DavidAlfa
author_rank: Super Contributor
timestamp: September 14, 2023, 05:35:14 am
content: It's a normal psram, just a terribly low detailed datasheet.Quote

author: aeg
author_rank: Regular Contributor
timestamp: September 14, 2023, 01:11:10 pm
content: Another equivalent is APS6404L available from Mouser.Interestingly, the Lyontek website still lists LY68L6400 as mass production.

author: peter-h
author_rank: Super Contributor
timestamp: July 17, 2024, 12:00:32 pm
content: And aliexpress is selling some counterfeits (which also don't work)...QuoteYou probably won't get an 8 megabyteSRAMfor $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 PSRAMwhich 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!