Specifications

CY14B108K
CY14B108M
Document Number: 001-47378 Rev. *K Page 33 of 36
Errata
This section describes the errata for the 8 Mb (2048 K × 8 and 1024 K × 16) nvSRAM product families. Details include errata trigger
conditions, scope of impact, available workarounds, and silicon revision applicability.
Contact your local Cypress Sales Representative if you have questions. You can also send your related queries directly to
[e-mail].
Part Numbers Affected
8Mb (1024 K × 8, 512 K × 16) nvSRAM Qualification Status
Production parts.
8Mb (1024 K × 8, 512 K × 16) nvSRAM Errata Summary
The following table defines the errata applicability to available CY14B108K, CY14B108M devices.
1. AutoStore Disable feature does not work correctly
■ Problem Definition
The AutoStore Disable soft sequence disables the AutoStore feature in nvSRAMs. The AutoStore Disable feature is used in
applications where data written in the SRAM is not required to be saved automatically on power loss. The 8Mb nvSRAM executes
the nonvolatile Store automatically in half the memory (4Mb) even after the AutoStore feature is disabled. The reason is as follows:
The 8Mb nvSRAM uses two dice stack of 4Mb with HSB
pin of each die are tied together. Each nvSRAM die in the stacked-die
monitors the VCC power independently. When the device VCC fails, the die which detects the VCC dropping below VSWITCH first,
internally triggers the power down interrupt and drives its HSB
output low. Since the HSB is a bidirectional pin, the low HSB output
driven by one die is detected as HSB
input by the other die. Therefore, low on the HSB input of other die internally triggers hardware
Store and executes unintended nonvolatile Store even though AutoStore was disabled by AutoStore Disable soft sequence.
■ Parameters Affected
None.
■ Trigger Condition(S)
Device VCC power down with nvSRAM AutoStore disable.
■ Scope of Impact
It can corrupt the data in half of the memory by overwriting the existing data in its nonvolatile memory with unintended data.
■ Workaround
None. AutoStore disable feature should not be used in 8Mb nvSRAMs.
■ Fix Status
This issue is applicable to all 8Mb nvSRAM parts in production and will continue serving with errata. There is no plan to fix this
issue in the existing parts in production.
Part Number Device Characteristics
CY14B108K 1024 K × 8, Asynchronous Interface nvSRAM with Real Time Clock in 44 TSOP-II package option
CY14B108M 512 K × 16, Asynchronous Interface nvSRAM with Real Time Clock in 54 TSOP-II package option
Items Part Number Silicon Revision Fix Status
1. AutoStore Disable feature does not work correctly CY14B108K
CY14B108M
Rev 0 None.
This issue is applicable
to all 8Mb nvSRAM parts
in production