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CY14MB064Q Datasheet(PDF) 8 Page - Cypress Semiconductor |
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CY14MB064Q Datasheet(HTML) 8 Page - Cypress Semiconductor |
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8 / 30 page  CY14MB064Q CY14ME064Q Document Number: 001-65018 Rev. *D Page 8 of 30 SPI Operating Features Power-Up Power-up is defined as the condition when the power supply is turned on and VCC crosses Vswitch voltage. As described earlier, at power-up nvSRAM performs a Power-Up RECALL operation for tFA duration during which, all memory accesses are disabled. The HSB pin can be probed to check the Ready/Busy status of nvSRAM after power-up. The following are the device status after power-up. ■ Selected (Active power mode) if CS pin is LOW ■ Deselected (Standby power mode) if CS pin is HIGH ■ Not in the Hold condition ■ Status Register state: ❐ Write Enable (WEN) bit is reset to ‘0’. ❐ WPEN, BP1, BP0 unchanged from previous STORE operation. The WPEN, BP1, and BP0 bits of the Status Register are nonvolatile bits and remain unchanged from the previous STORE operation. Power-Down At power-down (continuous decay of VCC), when VCC drops from the normal operating voltage and below the VSWITCH threshold voltage, the device stops responding to any instruction sent to it. If a write cycle is in progress and the last data bit D0 has been received when the power goes down, it is allowed tDELAY time to complete the write. After this, all memory accesses are inhibited and a conditional AutoStore operation is performed (AutoStore is not performed if no writes have happened since the last RECALL cycle). This feature prevents inadvertent writes to nvSRAM from happening during power-down. However, to completely avoid the possibility of inadvertent writes during power-down, ensure that the device is deselected and is in standby power mode, and the CS follows the voltage applied on VCC. Active Power and Standby Power Modes When CS is LOW, the device is selected and is in the active power mode. The device consumes ICC current, as specified in DC Electrical Characteristics on page 18. When CS is HIGH, the device is deselected and the device goes into the standby power mode after tSB time if a STORE or RECALL cycle is not in progress. If a STORE/RECALL cycle is in progress, the device goes into the standby power mode after the STORE or RECALL cycle is completed. In the standby power mode, the current drawn by the device drops to ISB. |
Similar Part No. - CY14MB064Q_12 |
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Similar Description - CY14MB064Q_12 |
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