Details

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BUY AT25256AN-10SU-2.7 https://www.utsource.net/itm/p/1125607.html
SPI Serial EEPROMs

Parameter	Description	Value	Unit
Device Type	Serial EEPROM	AT25256AN-10SU-2.7
Memory Size	Total Memory	256 Kbits
Organization	Memory Organization	32K x 8 bits
Operating Voltage	Supply Voltage Range	2.5 to 5.5	V
Operating Temperature	Operating Temperature Range	-40 to +85	°C
Interface	Communication Interface	SPI (Serial Peripheral Interface)
Clock Frequency	Maximum Clock Frequency	10	MHz
Write Time	Page Write Time	5	ms
Write Protection	Write Protect Pin	WP
Package	Package Type	8-pin TSSOP
Pin Configuration	Pin 1: CS (Chip Select)	Active Low
	Pin 2: SI (Serial Input)	Data In
	Pin 3: SCK (Serial Clock)	Clock
	Pin 4: GND (Ground)	Ground
	Pin 5: WP (Write Protect)	Write Protect
	Pin 6: SO (Serial Output)	Data Out
	Pin 7: HOLD (Hold)	Hold
	Pin 8: VCC (Power Supply)	Power Supply

Instructions for Use

1. Power Supply and Grounding:

   • Connect VCC (Pin 8) to the power supply within the specified range (2.5V to 5.5V).
   • Connect GND (Pin 4) to the ground.

2. Chip Select (CS):

   • CS (Pin 1) must be pulled low to enable communication with the device.
   • When CS is high, the device is in standby mode.

3. Serial Clock (SCK):

   • SCK (Pin 3) is the clock input for the SPI interface.
   • The maximum clock frequency is 10 MHz.

4. Serial Input (SI):

   • SI (Pin 2) is the data input pin for the SPI interface.
   • Data is shifted into the device on the rising edge of SCK.

5. Serial Output (SO):

   • SO (Pin 6) is the data output pin for the SPI interface.
   • Data is shifted out of the device on the falling edge of SCK.

6. Write Protect (WP):

   • WP (Pin 5) can be used to protect the memory from accidental writes.
   • When WP is high, write operations are disabled.
   • When WP is low, write operations are enabled.

7. Hold (HOLD):

   • HOLD (Pin 7) can be used to pause ongoing read or write operations.
   • When HOLD is high, the current operation is paused until HOLD is low again.

8. Data Sheet and Additional Information:

   • Refer to the datasheet for detailed timing diagrams, command codes, and other technical specifications.
   • Ensure that all signals are properly synchronized and meet the timing requirements specified in the datasheet.

9. Handling and Storage:

   • Handle the device with care to avoid static damage.
   • Store the device in a dry, cool place away from direct sunlight and extreme temperatures.

For more detailed information, refer to the official datasheet provided by Atmel (Microchip).

(For reference only)