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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 24C32/ 24C64. Eight 32K/64K devices may be addressed on a single bus system (device addressing is

discussed in detail under the Device Addressing section).

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 24C32/ 24C64 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

Memory Organization

24C32, 32K SERIAL EEPROM: Internally organized with 128 pages of 32 bytes each, the 32K requires an 12-bit

data word address for random word addressing.

24C64, 64K SERIAL EEPROM: Internally organized with 256 pages of 32 bytes each, the 64K requires a 13-bit

data word address for random word address

WP Pin Status

Part of the Array Protected

24C64

Full (64K) Array

24C32

Full (32K) Array

Normal Read / Write Operations

At GND

3

24C32 / 24C64

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