CY14B104NA-ZS25XI datasheet(8/25 Pages) CYPRESS

Part #	CY14B104NA-ZS25XI

Description	4-Mbit (512 K x 8/256 K x 16) nvSRAM 20 ns, 25 ns, and 45 ns access times

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Manufacturer	CYPRESS [Cypress Semiconductor]

Direct Link	http://www.cypress.com

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CY14B104LA, CY14B104NA

Document #: 001-49918 Rev. *I

Page 8 of 25

Best Practices

nvSRAM products have been used effectively for over 27 years.

While ease-of-use is one of the product’s main system values,

experience gained working with hundreds of applications has

resulted in the following suggestions as best practices:

■ The non-volatile cells in this nvSRAM product are delivered

from Cypress with 0x00 written in all cells. Incoming inspection

routines at customer or contract manufacturer’s sites

sometimes reprogram these values. Final NV patterns are

typically repeating patterns of AA, 55, 00, FF, A5, or 5A. End

product’s firmware should not assume an NV array is in a set

programmed state. Routines that check memory content

values to determine first time system configuration, cold or

warm boot status, and so on should always program a unique

NV pattern (that is, complex 4-byte pattern of 46 E6 49 53 hex

or more random bytes) as part of the final system manufac-

turing test to ensure these system routines work consistently.

■ power-up boot firmware routines should rewrite the nvSRAM

into the desired state (for example, AutoStore enabled). While

the nvSRAM is shipped in a preset state, best practice is to

again rewrite the nvSRAM into the desired state as a safeguard

against events that might flip the bit inadvertently such as

program bugs and incoming inspection routines.

■ The VCAP value specified in this datasheet includes a minimum

and a maximum value size. Best practice is to meet this

requirement and not exceed the maximum VCAPvalue because

the nvSRAM internal algorithm calculates VCAP charge and

discharge time based on this maximum VCAP value. Customers

that want to use a larger VCAP value to make sure there is extra

store charge and store time should discuss their VCAP size

selection with Cypress to understand any impact on the VCAP

voltage level at the end of a tRECALL period.

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CY14B104NA-ZS25XI Datasheet(PDF) 8 Page - Cypress Semiconductor

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