Cypress Semiconductor STK14C88-3 Manuel d'utilisateur télécharger pdf (Page 6)

AN55662

October 5, 2009 Document No. 001-55662 Rev. ** 6

Power Up Recall Related Improvements

Additional parameters are specified in CY14B256LA such as

HSB

Output Disable Voltage (V

HDIS

HSB

To Output Active

Time (t

LZHSB

), and

HSB

High Active Time (t

HHHD

) which helps in system design. Refer to Figure 3 and Figure 4 for the definition

of the additional specs in power up. Also, note that

HSB

remains low until the end of the power up in the new part. This would

guard against the system inadvertently thinking the part has completed the boot up prior to real completion.

Figure 3. STK14C88-3: Power Up Recall

Figure 4. CY14B256LA: Power Up Recall

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Cypress Semiconductor STK14C88-3 Manuel d'utilisateur Page 6