Details

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BUY DS1245Y-120 https://www.utsource.net/itm/p/12536174.html

Parameter	Description	DS1245Y-120 Specifications
Device Type	Nonvolatile static RAM with I2C interface	NV SRAM
Memory Size	Memory size	4K bits (512 x 8)
Data Retention	Data retention time	10 years
Supply Voltage	Operating voltage range	2.5V to 5.5V
I2C Bus Speed	Maximum I2C bus speed	400 kHz (Fast-mode)
Write Cycle	Time required for a write cycle	5 ms
Package Type	Package type	SOIC-8, TSSOP-8
Operating Temp.	Operating temperature range	-40°C to +85°C
Standby Current	Supply current during standby	1 μA (typical at 3V)
Active Current	Supply current during active operation	3 mA (typical at 3V, 400 kHz)

Instructions:

1. Power Supply Connection: Connect VCC to the supply voltage between 2.5V and 5.5V and GND to ground.
2. I2C Interface Setup: Ensure that the SDA and SCL lines are connected to pull-up resistors to VCC. The value of these resistors depends on the bus capacitance and desired speed but typically ranges from 1kΩ to 10kΩ.
3. Writing Data: To write data, initiate a start condition followed by the device address with the R/W bit low, then send the memory address and data byte(s). Terminate the sequence with a stop condition.
4. Reading Data: For reading, send a start condition, the device address with the R/W bit high, and then read the data bytes. End with a stop condition.
5. Data Retention: Ensure that the backup power source is sufficient to maintain data integrity over the specified retention period.
6. Handling Care: Avoid exposing the device to temperatures outside the operating range to prevent damage or data loss.
7. Storage: Store in a dry environment when not in use to prevent corrosion or other damage.

(For reference only)