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AT25DF256

DS-25DF256–035D–2/2017

SO (I/O1)

SERIAL OUTPUT: The SO pin is used to shift data out from the device. Data on the SO pin

is always clocked out on the falling edge of SCK.

With the Dual-Output Read commands, the SO Pin remains an output pin (I/O1) in

conjunction with other pins to allow two bits of data on (I/O1-0) to be clocked out on every

falling edge of SCK.

To maintain consistency with the SPI nomenclature, the SO (I/O1) pin will be referenced as

the SO pin unless specifically addressing the Dual-I/O modes in which case it will be

referenced as I/O1.

The SO pin will be in a high-impedance state whenever the device is deselected (CS is

deasserted).

Input/Output

WRITE PROTECT: The WP pin controls the hardware locking feature of the device. Please

refer to “Protection Commands and Features” on page 12 for more details on protection

features and the WP pin.

The WP pin is internally pulled-high and may be left floating if hardware controlled protection

will not be used. However, it is recommended that the WP pin also be externally connected

to VCC whenever possible.

Low

Input

HOLD

HOLD: The HOLD pin is used to temporarily pause serial communication without

deselecting or resetting the device. While the HOLD pin is asserted, transitions on the SCK

pin and data on the SI pin will be ignored, and the SO pin will be in a high-impedance state.

The CS pin must be asserted, and the SCK pin must be in the low state in order for a

Hold condition to start. A Hold condition pauses serial communication only and does

not have an effect on internally self-timed operations such as a program or erase cycle.

Please refer to “Hold” on page 27 for additional details on the Hold operation.

The HOLD pin is internally pulled-high and may be left floating if the Hold function will not be

used. However, it is recommended that the HOLD pin also be externally connected to VCC

whenever possible.

Low

Input

VCC

DEVICE POWER SUPPLY: The VCC pin is used to supply the source voltage to the device.

Operations at invalid VCC voltages may produce spurious results and should not be

attempted.

Power

GND

GROUND: The ground reference for the power supply. GND should be connected to the

system ground.

Power

Table 2-1.

Pin Descriptions (Continued)

Symbol

Name and Function

Asserted

State

Type

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