24C02 / 24C04 / 24C08 / 24C16
Pin Descriptions
DEVICE/PAGE ADDRESSES (A2, A1 and A0): The A2, A1 and A0 pins are device address inputs that are hard
wired for the 24C02. Eight 2K devices may be addressed on a single bus system (device addressing is discussed in
detail under the Device Addressing section).
The 24C04 uses the A2 and A1 inputs for hard wire addressing and a total of four 4K devices may be addressed on a
single bus system. The A0 pin is a no connect and can be connected to ground.
The 24C08 only uses the A2 input for hardwire addressing and a total of two 8K devices may be addressed on a single
bus system. The A0 and A1 pins are no connects and can be connected to ground.
The 24C16 does not use the device address pins, which limits the number of devices on a single bus to one. The A0,
A1 and A2 pins are no connects and can be connected to ground.
SERIAL DATA (SDA): The SDA pin is bi-directional for serial data transfer. This pin is open-drain driven and may be
wire-ORed with any number of other open-drain or open- collector devices.
SERIAL CLOCK (SCL): The SCL input is used to positive edge clock data into each EEPROM device and negative
edge clock data out of each device.
WRITE PROTECT (WP): The 24C02/ 24C04/ 24C08/ 24C16 has a Write Protect pin that provides hardware data
protection. The Write Protect pin allows normal read/write operations when connected to ground (GND). When the Write
Protect pin is connected to VCC, the write protection feature is enabled and operates as shown in the following Table 2.
Table 2: Write Protect
Part of the Array Protected
WP Pin Status
24C02
24C04
24C08
24C16
At VCC
Full (2K) Array
Full (4K) Array
Full (8K) Array
Full (16K) Array
At GND
Normal Read / Write Operations
Memory Organization
24C02, 2K SERIAL EEPROM: Internally organized with 32 pages of 8 bytes each, the 2K requires an 8-bit data
word address for random word addressing.
24C04, 4K SERIAL EEPROM: Internally organized with 32 pages of 16 bytes each, the 4K requires a 9-bit data
word address for random word addressing.
24C08, 8K SERIAL EEPROM: Internally organized with 64 pages of 16 bytes each, the 8K requires a 10-bit data
word address for random word addressing.
24C16, 16K SERIAL EEPROM: Internally organized with 128 pages of 16 bytes each, the 16K requires an 11-bit
data word address for random word addressing.
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