ACE24C02/04/08/16B

Two-wire Serial EEPROM

VER 1.3

8

Figure 2．Start and Stop Definition

Figure 3．Output Acknowledge

Device Addressing

The 2K, 4K, 8K and 16K EEPROM devices all require an 8-bit device address word following a start

condition to enable the chip for a read or write operation (see to Figure 4).

The device address word consists of a mandatory one, zero sequence for the first four most

significant bits as shown. This is common to all the EEPROM devices.

The next 3 bits are the A2, A1 and A0 device address bits for the 2K EEPROM. These 3 bits must

compare to their corresponding hard-wired input pins.

The 4K EEPROM only uses the A2 and A1 device address bits with the third bit being a memory page

address bit. The two device address bits must compare to their corresponding hard-wired input pins.

The A0 pin is no connect.

The 8K EEPROM only uses the A2 device address bit with the next 2 bits being for memory page

addressing. The A2 bit must compare to its corresponding hard-wired input pin. The A1 and A0 pins are

no connect.