Cypress Semiconductor STK14C88-3 Manual de usuario descargar pdf (Pagina 4)

AN55662

October 5, 2009 Document No. 001-55662 Rev. ** 4

AutoStore Inhibit

The STK14C88-3 has the AutoStore Inhibit feature and the

CY14B256LA has AutoStore Disable mode. These two

provide the same result of AutoStore disable but are done

by different means – hardware in STK14C88-3 and software

in CY14B256LA.

To disable AutoStore in STK14C88-3, the power is

connected to the V

CAP

pin and the V

pin is grounded (or

left open). This cannot be done in CY14B256LA. For proper

operation of the device, in CY14B256LA, power is

connected to the V

pin only. However, AutoStore disable

is more easily done through simple software sequence.

Therefore, if the STK14C88-3 is replaced in an application

where AutoStore has been disabled, then the layout has to

be modified to connect the power to the V

pin and a

software sequence has to be used to disable AutoStore

function followed by a Software STORE, the first time the

board is powered up.

STORE Cycles

The NV STORE cycles endurance in CY14B256LA is lower

than the endurance in the older 0.8u technology. However,

this would not affect most applications since all nvSRAMs

have infinite read/write endurance and the NV STORE cycle

happens only during power down or during Software

STORE. For example, if a system is powered down 10 times

a day, then the NV STORE endurance is reached in

54 years in CY14B256LA.

Data Retention

The Data Retention in 0.13u part is vastly improved from the

older technology part. The CY14B256LA has a data

retention of 20 years at 85°C against the STK14C88-3 data

retention of 100 years at 55°C. This translates to over

4 times improvement in data retention at the same

temperatures.

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Cypress Semiconductor STK14C88-3 Manual de usuario Pagina 4