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Part No.	24FC128
Manufacturer	MICROCHIP
Size	952 Kbytes
Pages	38 pages
Description	128K I2C CMOS Serial EEPROM

Datasheet Summary with AI

1. General Overview

️· Device Type: EEPROM (Electrically Erasable Programmable Read-Only Memory)
️· Memory Size: 128 Kbit (16 KByte)
️· Interface: 2-Wire Serial Interface (I2C compatible)
️· Package Options: PDIP, SOIC, TSSOP, MSOP, DFN, TDFN. The MSOP package has limitations regarding the A0, A1, and A2 chip select pins (they are not connected).
️· Purpose: Provides non-volatile storage for data that needs to be retained even when power is removed.

2. Pin Descriptions

️· A0, A1, A2 (Chip Select): Used for multiple device selection on the same bus. Must be connected to VCC or ground.
️· SDA (Serial Data): Bidirectional data line. Requires a pull-up resistor (typically 10kΩ or 2kΩ depending on clock speed).
️· SCL (Serial Clock): Clock line, driven by the master device.
️· WP (Write-Protect): Connected to VSS for write enable, VCC for write disable.
️· VCC: Power supply voltage (+1.7V to +5.5V for 24AA128 and 24FC128, +2.5V to +5.5V for 24LC128).
️· VSS: Ground.
️· DFN/TDFN exposed pad: Can be connected to VSS or left floating.

3. Functional Description and Bus Protocol

️· I2C Protocol: The device operates using a 2-wire I2C-compatible protocol.
️· Master/Slave Relationship: One device acts as the master (controlling the bus), and the EEPROM acts as a slave.
️· Bus States:
- Not Busy (A): Both SDA and SCL are high.
- Start Data Transfer (B): SDA goes low while SCL is high.
- Stop Data Transfer (C): SDA goes high while SCL is high.
- Data Valid (D): Data is stable during the high period of the clock signal.
️· Acknowledge (ACK): A slave device acknowledges receipt of a byte by pulling SDA low during the ACK clock pulse. A master can prevent the ACK to signal the end of a read operation.

4. Key Electrical Characteristics

️· Operating Voltage: Ranges depending on device variant (AA, LC, FC).
️· Clock Frequencies: Supports various clock speeds (100 kHz, 400 kHz, 1 MHz) which influence pull-up resistor requirements.
️· Endurance: Up to 1,000,000 write/erase cycles.

5. Important Notes

️· Pull-Up Resistors: Essential for the SDA line to function correctly.
️· Chip Select Pins (A0, A1, A2): Require proper connection to VCC or ground.
️· MSOP Package Limitation: Limited chip select functionality.