LESHAN RADIO COMPANY, LTD.
DEVICE/PAGE ADDRESSES (A2, A1 and A0): The A2, A1 and A0 pins are device address inputs that
are hard wired for the LR24C02. Eight 2K devices may be addressed on a single bus system (device
addressing is discussed in detail under the Device Addressing section).
The LR24C04 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 LR24C08 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
The LR24C16 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 LR24C02/LR24C04/LR24C08/LR24C16 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.
WP Pin Status:
Part of the Array Protected
Full (16K) Array
Normal Read/Write Operations
LR24C02, 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.
LR24C04, 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.
LR24C08, 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.
LR24C16, 16K SERIAL EEPROM: Internally organized with 128 pages of 16 bytes each, the 16K