Weebit - 2022 and beyond, page-1368

Can't answer your question Archibaldheeren, but the following from WBT Chief Scientist Mr G Molas, are clear and definitive statements about the intrinsic quality and reliability of the WBT ReRAM technology stack:

In our paper, we show that Weebit ReRAM can endure more than 10 to the power of 5 cycles with no memory degradation, and no failure on 16kb arrays. This was achieved based on a single programming pulse without using a program and verify (P&V) algorithm (which would have enabled adjustments to be made throughout the cycling).

The results are based on raw data, reflecting the intrinsic quality of the Weebit ReRAM technology and memory stack.

In addition, 10 to the power of 6 cycles are achievable with some optimizations.

Other Key Findings

The new paper outlines many other findings based on a wide array of tests. One example is testing for solder reflow compliance. Since most assembly processes require short bursts of very high-temperature soldering (up to three cycles), it’s critical that the NVM retain its programmed data during this process. NVM technology must sustain the Pb-free solder reflow profile as described on JEDEC standards (IPC/JEDEC J-STD-020D.1), with a 260°C temperature peak.

Weebit ReRAM passed basic (3x reflow) and extended (9 cycles) SMT (Surface Mount Technology) tests with zero failures.

In addition to tests that show raw data – highlighting the intrinsic performance aspects of Weebit ReRAM – we also showed how technology enhancements and forming protocol optimizations can optimize device performance. And the paper highlights the results we achieved using a P&V (Program and Verify) algorithm.

In a real product, such an algorithm is used to make optimizations/reprogramming tweaks after each programming operation. Using a P&V algorithm, Weebit ReRAM achieved a clear window margin with zero failures on a 1Mb array.

The conclusion of all of our tests show that Weebit ReRAM is a highly reliable ReRAM technology when integrated in 28nm. As we continue our progress toward productization, and also work on 22nm and below, these results go a long way in showing that customers can be confident in engaging with Weebit for next-generation designs.

**riel Molas, Weebit Chief Scientist