Details

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BUY AT24C256B-PU https://www.utsource.net/itm/p/4146005.html
Two-wire Serial EEPROM 256K (32,768 x 8) ATMEL Corporation 1 AT24C256B-PU Two-wire Serial EEPROM

Parameter	Symbol	Min	Typ	Max	Unit	Notes
Operating Voltage	VCC	1.8	-	5.5	V
Operating Current (Read)	ICCR	0.1	1	3	mA
Operating Current (Write)	ICCW	0.5	3	5	mA
Standby Current	ICCZ	0.1	1	5	μA
Write Cycle Time	tWC	5	-	-	ms
Page Write Time	tPW	5	-	-	ms
Data Retention	-	-	-	100	years
Memory Size	-	-	-	256	Kbits
Organization	-	-	-	32K x 8	bits
Operating Temperature	Toper	-40	-	85	°C
Storage Temperature	Tstg	-65	-	150	°C
Package Type	-	-	-	DIP-8/SOIC-8

Instructions for Using AT24C256B-PU

1. Power Supply:

   • Ensure the operating voltage (VCC) is within the range of 1.8V to 5.5V.
   • Connect the ground (GND) pin to the system ground.

2. Addressing:

   • The device has three address pins (A0, A1, A2) which can be used to select one of up to eight devices on the same I2C bus.
   • Set the address pins to the desired configuration using external pull-up or pull-down resistors.

3. I2C Communication:

   • Use the SDA (Serial Data) and SCL (Serial Clock) lines for communication.
   • Ensure the SDA and SCL lines have appropriate pull-up resistors to VCC.
   • The I2C address of the device is determined by the state of the A0, A1, and A2 pins.

4. Read Operation:

   • Send a start condition followed by the device address with the read/write bit set to 0 (write).
   • Send the memory address where the read should begin.
   • Send a repeated start condition followed by the device address with the read/write bit set to 1 (read).
   • Read the data from the device.
   • Send a stop condition to end the read operation.

5. Write Operation:

   • Send a start condition followed by the device address with the read/write bit set to 0 (write).
   • Send the memory address where the write should begin.
   • Send the data to be written.
   • Send a stop condition to end the write operation.
   • Wait for the write cycle time (tWC) to complete before performing another write operation.

6. Page Write:

   • For page writes, you can write up to 32 bytes in a single operation as long as they are within the same 32-byte page.
   • Ensure that the write operation does not cross a page boundary; if it does, split the write into two operations.

7. Data Retention:

   • The device guarantees data retention for up to 100 years under normal operating conditions.

8. Temperature Considerations:

   • The device operates reliably within the temperature range of -40°C to 85°C.
   • Store the device in temperatures between -65°C and 150°C.

9. Handling:

   • Handle the device with care to avoid static discharge, which can damage the device.
   • Use proper ESD protection when handling the device.

By following these parameters and instructions, you can ensure reliable operation of the AT24C256B-PU EEPROM.

(For reference only)