Autostore or power up recall, Switching waveforms – Cypress CY14B256L User Manual
Page 11
CY14B256L
Document Number: 001-06422 Rev. *H
Page 11 of 18
AutoStore or Power Up RECALL
Parameter
Alt
Description
CY14B256L
Unit
Min
Max
t
HRECALL
[12]
t
RESTORE
Power up RECALL Duration
20
ms
t
STORE
t
HLHZ
STORE Cycle Duration
12.5
ms
V
SWITCH
Low Voltage Trigger Level
2.65
V
t
VCCRISE
V
CC
Rise Time
150
μs
Switching Waveforms
Figure 9. AutoStore/Power Up RECALL
V
CC
V
SWITCH
t
STORE
t
STORE
t
HRECALL
t
HRECALL
AutoStore
POWER-UP RECALL
Read & Write Inhibited
STORE occurs only
if a SRAM write
has happened
No STORE occurs
without atleast one
SRAM write
t
VCCRISE
Note Read and Write cycles are ignored during STORE, RECALL, and while Vcc is below V
SWITCH
Notes
12. t
HRECALL
starts from the time V
CC
rises above V
SWITCH
.
13. If an SRAM WRITE has not taken place since the last nonvolatile cycle, no STORE will take place.
14. Industrial grade devices requires 15 ms max.