AT25FS010 데이터 시트보기 (PDF) - Atmel Corporation

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AT25FS010

High Speed Small Sectored SPI Flash Memory

Atmel Corporation 

3. Operating Features

3.1 Recommended Power-up

When the power supply is turned on, Vcc rises monotonically from ground to the full operating

Vcc. During this time, the Chip Select (CS) signal is not allowed to float and must follow Vcc. For

this reason, it is recommended to use a suitable pull-up resistor connected between CS and Vcc.

The device is ready for communication once a stable Vcc is reached within the specified operat-

ing voltage range.

3.2 Recommended Power-down

The device must be deselected and in Standby and Write Disabled mode prior to Vcc power

down sequence. This means there should be no write operation/internal Write cycle or read

operation in progress during the Chip Select (CS) line must be allowed to follow Vcc during power

down. After power down, it is recommended Vcc should be held at ground level for at least 0.5

seconds before power up again.

3.3 Power On Reset Protection

In order to prevent data corruption and inadvertent Write operations during device power-up and

power down, a Power On Reset (POR) circuit is enabled. At Power-up (continuous rise of Vcc

from 0v), the device will not respond to any instruction and will be held in reset (which puts the

device in standby mode) until the Vcc has reached the Power On Reset threshold voltage. This

threshold is lower than the minimum specified Vcc operation voltage.

At power down (continuous fall of Vcc), when Vcc drops from the operating voltage below the

POR threshold, all operations are disabled and the device will not respond to any command. A

stable and valid Vcc must be applied before executing and communication.

Please note: The POR threshold trip point is ~1.8v for Serial Flash products and is ensured by

design to have a reset during power up and power down and is not 100% tested.

6 AT25FS010

5167E–SFLSH–5/09

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